Maniacbug's RF24 arduino library ported to mbed. Tested, it works for Nucleo F411

Dependents:   RF24Network_Send RF24Network_Receive WeatherStation maple_chotobot_rf_motores ... more

Revision:
3:e94be00fd19e
Parent:
2:3bdf0d9bb71f
Child:
4:a35313611c1c
--- a/RF24.h	Thu Nov 05 05:40:23 2015 +0000
+++ b/RF24.h	Thu Nov 05 05:45:58 2015 +0000
@@ -6,12 +6,21 @@
  version 2 as published by the Free Software Foundation.
  */
 
+/*
+ * Mbed support added by Akash Vibhute <akash.roboticist@gmail.com>
+ * Porting completed on Nov/05/2015
+ *
+ * Updated with TMRh20's RF24 library on Nov/04/2015 from https://github.com/TMRh20
+ *
+ */
+
 /**
  * @file RF24.h
  *
  * Class declaration for RF24 and helper enums
  */
 
+
 #ifndef __RF24_H__
 #define __RF24_H__
 
@@ -22,9 +31,6 @@
 
 #include <mbed.h>
 
-
-
-
 /**
  * Power Amplifier level.
  *
@@ -54,1070 +60,1032 @@
 {
 private:
 
-  SPI spi;
-  Timer mainTimer;
-  DigitalOut  ce_pin; /**< "Chip Enable" pin, activates the RX or TX role */
-  DigitalOut  csn_pin; /**< SPI Chip select */
-  
-  
-  
-  
-  
-  
-  
-  
-  
-  
-  
-  
-  
+    SPI spi;
+    Timer mainTimer;
+    DigitalOut  ce_pin; /**< "Chip Enable" pin, activates the RX or TX role */
+    DigitalOut  csn_pin; /**< SPI Chip select */
 
-  bool p_variant; /* False for RF24L01 and true for RF24L01P */
-  uint8_t payload_size; /**< Fixed size of payloads */
-  bool dynamic_payloads_enabled; /**< Whether dynamic payloads are enabled. */
-  uint8_t pipe0_reading_address[5]; /**< Last address set on pipe 0 for reading. */
-  uint8_t addr_width; /**< The address width to use - 3,4 or 5 bytes. */
-  uint32_t txRxDelay; /**< Var for adjusting delays depending on datarate */
-  
+    bool p_variant; /* False for RF24L01 and true for RF24L01P */
+    uint8_t payload_size; /**< Fixed size of payloads */
+    bool dynamic_payloads_enabled; /**< Whether dynamic payloads are enabled. */
+    uint8_t pipe0_reading_address[5]; /**< Last address set on pipe 0 for reading. */
+    uint8_t addr_width; /**< The address width to use - 3,4 or 5 bytes. */
+    uint32_t txRxDelay; /**< Var for adjusting delays depending on datarate */
+
 
 protected:
-  /**
-   * SPI transactions
-   *
-   * Common code for SPI transactions including CSN toggle
-   *
-   */
-  inline void beginTransaction();
+    /**
+     * SPI transactions
+     *
+     * Common code for SPI transactions including CSN toggle
+     *
+     */
+    inline void beginTransaction();
 
-  inline void endTransaction();
+    inline void endTransaction();
 
 public:
 
-  /**
-   * @name Primary public interface
-   *
-   *  These are the main methods you need to operate the chip
-   */
-  /**@{*/
+    /**
+     * @name Primary public interface
+     *
+     *  These are the main methods you need to operate the chip
+     */
+    /**@{*/
 
-  
-  
-  
-  
-  
-  
-  
-  
-  
-  
-  
-  
-  
-  
-  
-  
-  
-  
-  
-  
-  
-  
-  
-  RF24(PinName miso, PinName mosi, PinName sck, PinName _cepin, PinName _csnpin);
-
+    RF24(PinName miso, PinName mosi, PinName sck, PinName _cepin, PinName _csnpin);
 
 
-  
-  
-
-  /**
-   * Begin operation of the chip
-   * 
-   * Call this in setup(), before calling any other methods.
-   * @code radio.begin() @endcode
-   */
-  bool begin(void);
+    /**
+     * Begin operation of the chip
+     *
+     * Call this in setup(), before calling any other methods.
+     * @code radio.begin() @endcode
+     */
+    bool begin(void);
 
-  /**
-   * Start listening on the pipes opened for reading.
-   *
-   * 1. Be sure to call openReadingPipe() first.  
-   * 2. Do not call write() while in this mode, without first calling stopListening().
-   * 3. Call available() to check for incoming traffic, and read() to get it. 
-   *  
-   * @code
-   * Open reading pipe 1 using address CCCECCCECC
-   *  
-   * byte address[] = { 0xCC,0xCE,0xCC,0xCE,0xCC };
-   * radio.openReadingPipe(1,address);
-   * radio.startListening();
-   * @endcode
-   */
-  void startListening(void);
+    /**
+     * Start listening on the pipes opened for reading.
+     *
+     * 1. Be sure to call openReadingPipe() first.
+     * 2. Do not call write() while in this mode, without first calling stopListening().
+     * 3. Call available() to check for incoming traffic, and read() to get it.
+     *
+     * @code
+     * Open reading pipe 1 using address CCCECCCECC
+     *
+     * byte address[] = { 0xCC,0xCE,0xCC,0xCE,0xCC };
+     * radio.openReadingPipe(1,address);
+     * radio.startListening();
+     * @endcode
+     */
+    void startListening(void);
+
+    /**
+     * Stop listening for incoming messages, and switch to transmit mode.
+     *
+     * Do this before calling write().
+     * @code
+     * radio.stopListening();
+     * radio.write(&data,sizeof(data));
+     * @endcode
+     */
+    void stopListening(void);
+
+    /**
+     * Check whether there are bytes available to be read
+     * @code
+     * if(radio.available()){
+     *   radio.read(&data,sizeof(data));
+     * }
+     * @endcode
+     * @return True if there is a payload available, false if none is
+     */
+    bool available(void);
 
-  /**
-   * Stop listening for incoming messages, and switch to transmit mode.
-   *
-   * Do this before calling write().
-   * @code
-   * radio.stopListening();
-   * radio.write(&data,sizeof(data));
-   * @endcode
-   */
-  void stopListening(void);
-
-  /**
-   * Check whether there are bytes available to be read
-   * @code
-   * if(radio.available()){
-   *   radio.read(&data,sizeof(data));
-   * }
-   * @endcode
-   * @return True if there is a payload available, false if none is
-   */
-  bool available(void);
+    /**
+     * Read the available payload
+     *
+     * The size of data read is the fixed payload size, see getPayloadSize()
+     *
+     * @note I specifically chose 'void*' as a data type to make it easier
+     * for beginners to use.  No casting needed.
+     *
+     * @note No longer boolean. Use available to determine if packets are
+     * available. Interrupt flags are now cleared during reads instead of
+     * when calling available().
+     *
+     * @param buf Pointer to a buffer where the data should be written
+     * @param len Maximum number of bytes to read into the buffer
+     *
+     * @code
+     * if(radio.available()){
+     *   radio.read(&data,sizeof(data));
+     * }
+     * @endcode
+     * @return No return value. Use available().
+     */
+    void read( void* buf, uint8_t len );
 
-  /**
-   * Read the available payload
-   *
-   * The size of data read is the fixed payload size, see getPayloadSize()
-   *
-   * @note I specifically chose 'void*' as a data type to make it easier
-   * for beginners to use.  No casting needed.
-   *
-   * @note No longer boolean. Use available to determine if packets are
-   * available. Interrupt flags are now cleared during reads instead of
-   * when calling available().
-   *
-   * @param buf Pointer to a buffer where the data should be written
-   * @param len Maximum number of bytes to read into the buffer
-   *
-   * @code
-   * if(radio.available()){
-   *   radio.read(&data,sizeof(data));
-   * }
-   * @endcode
-   * @return No return value. Use available().
-   */
-  void read( void* buf, uint8_t len );
+    /**
+     * Be sure to call openWritingPipe() first to set the destination
+     * of where to write to.
+     *
+     * This blocks until the message is successfully acknowledged by
+     * the receiver or the timeout/retransmit maxima are reached.  In
+     * the current configuration, the max delay here is 60-70ms.
+     *
+     * The maximum size of data written is the fixed payload size, see
+     * getPayloadSize().  However, you can write less, and the remainder
+     * will just be filled with zeroes.
+     *
+     * TX/RX/RT interrupt flags will be cleared every time write is called
+     *
+     * @param buf Pointer to the data to be sent
+     * @param len Number of bytes to be sent
+     *
+     * @code
+     * radio.stopListening();
+     * radio.write(&data,sizeof(data));
+     * @endcode
+     * @return True if the payload was delivered successfully false if not
+     */
+    bool write( const void* buf, uint8_t len );
 
-  /**
-   * Be sure to call openWritingPipe() first to set the destination
-   * of where to write to.
-   *
-   * This blocks until the message is successfully acknowledged by
-   * the receiver or the timeout/retransmit maxima are reached.  In
-   * the current configuration, the max delay here is 60-70ms.
-   *
-   * The maximum size of data written is the fixed payload size, see
-   * getPayloadSize().  However, you can write less, and the remainder
-   * will just be filled with zeroes.
-   *
-   * TX/RX/RT interrupt flags will be cleared every time write is called
-   *
-   * @param buf Pointer to the data to be sent
-   * @param len Number of bytes to be sent
-   *
-   * @code
-   * radio.stopListening();
-   * radio.write(&data,sizeof(data));
-   * @endcode
-   * @return True if the payload was delivered successfully false if not
-   */
-  bool write( const void* buf, uint8_t len );
+    /**
+     * New: Open a pipe for writing via byte array. Old addressing format retained
+     * for compatibility.
+     *
+     * Only one writing pipe can be open at once, but you can change the address
+     * you'll write to. Call stopListening() first.
+     *
+     * Addresses are assigned via a byte array, default is 5 byte address length
+    s   *
+     * @code
+     *   uint8_t addresses[][6] = {"1Node","2Node"};
+     *   radio.openWritingPipe(addresses[0]);
+     * @endcode
+     * @code
+     *  uint8_t address[] = { 0xCC,0xCE,0xCC,0xCE,0xCC };
+     *  radio.openWritingPipe(address);
+     *  address[0] = 0x33;
+     *  radio.openReadingPipe(1,address);
+     * @endcode
+     * @see setAddressWidth
+     *
+     * @param address The address of the pipe to open. Coordinate these pipe
+     * addresses amongst nodes on the network.
+     */
 
-  /**
-   * New: Open a pipe for writing via byte array. Old addressing format retained
-   * for compatibility.
-   *
-   * Only one writing pipe can be open at once, but you can change the address
-   * you'll write to. Call stopListening() first.
-   *
-   * Addresses are assigned via a byte array, default is 5 byte address length
-s   *
-   * @code
-   *   uint8_t addresses[][6] = {"1Node","2Node"};
-   *   radio.openWritingPipe(addresses[0]);
-   * @endcode
-   * @code
-   *  uint8_t address[] = { 0xCC,0xCE,0xCC,0xCE,0xCC };
-   *  radio.openWritingPipe(address);
-   *  address[0] = 0x33;
-   *  radio.openReadingPipe(1,address);
-   * @endcode
-   * @see setAddressWidth
-   *
-   * @param address The address of the pipe to open. Coordinate these pipe
-   * addresses amongst nodes on the network.
-   */
-
-  void openWritingPipe(const uint8_t *address);
+    void openWritingPipe(const uint8_t *address);
 
-  /**
-   * Open a pipe for reading
-   *
-   * Up to 6 pipes can be open for reading at once.  Open all the required
-   * reading pipes, and then call startListening().
-   *
-   * @see openWritingPipe
-   * @see setAddressWidth
-   *
-   * @note Pipes 0 and 1 will store a full 5-byte address. Pipes 2-5 will technically 
-   * only store a single byte, borrowing up to 4 additional bytes from pipe #1 per the
-   * assigned address width.
-   * @warning Pipes 1-5 should share the same address, except the first byte.
-   * Only the first byte in the array should be unique, e.g.
-   * @code
-   *   uint8_t addresses[][6] = {"1Node","2Node"};
-   *   openReadingPipe(1,addresses[0]);
-   *   openReadingPipe(2,addresses[1]);
-   * @endcode
-   *
-   * @warning Pipe 0 is also used by the writing pipe.  So if you open
-   * pipe 0 for reading, and then startListening(), it will overwrite the
-   * writing pipe.  Ergo, do an openWritingPipe() again before write().
-   *
-   * @param number Which pipe# to open, 0-5.
-   * @param address The 24, 32 or 40 bit address of the pipe to open.
-   */
+    /**
+     * Open a pipe for reading
+     *
+     * Up to 6 pipes can be open for reading at once.  Open all the required
+     * reading pipes, and then call startListening().
+     *
+     * @see openWritingPipe
+     * @see setAddressWidth
+     *
+     * @note Pipes 0 and 1 will store a full 5-byte address. Pipes 2-5 will technically
+     * only store a single byte, borrowing up to 4 additional bytes from pipe #1 per the
+     * assigned address width.
+     * @warning Pipes 1-5 should share the same address, except the first byte.
+     * Only the first byte in the array should be unique, e.g.
+     * @code
+     *   uint8_t addresses[][6] = {"1Node","2Node"};
+     *   openReadingPipe(1,addresses[0]);
+     *   openReadingPipe(2,addresses[1]);
+     * @endcode
+     *
+     * @warning Pipe 0 is also used by the writing pipe.  So if you open
+     * pipe 0 for reading, and then startListening(), it will overwrite the
+     * writing pipe.  Ergo, do an openWritingPipe() again before write().
+     *
+     * @param number Which pipe# to open, 0-5.
+     * @param address The 24, 32 or 40 bit address of the pipe to open.
+     */
+
+    void openReadingPipe(uint8_t number, const uint8_t *address);
 
-  void openReadingPipe(uint8_t number, const uint8_t *address);
-
-   /**@}*/
-  /**
-   * @name Advanced Operation
-   *
-   *  Methods you can use to drive the chip in more advanced ways
-   */
-  /**@{*/
+    /**@}*/
+    /**
+     * @name Advanced Operation
+     *
+     *  Methods you can use to drive the chip in more advanced ways
+     */
+    /**@{*/
 
-  /**
-   * Print a giant block of debugging information to stdout
-   *
-   * @warning Does nothing if stdout is not defined.  See fdevopen in stdio.h
-   * The printf.h file is included with the library for Arduino.
-   * @code
-   * #include <printf.h>
-   * setup(){
-   *  Serial.begin(115200);
-   *  printf_begin();
-   *  ...
-   * }
-   * @endcode
-   */
-  void printDetails(void);
+    /**
+     * Print a giant block of debugging information to stdout
+     *
+     * @warning Does nothing if stdout is not defined.  See fdevopen in stdio.h
+     * The printf.h file is included with the library for Arduino.
+     * @code
+     * #include <printf.h>
+     * setup(){
+     *  Serial.begin(115200);
+     *  printf_begin();
+     *  ...
+     * }
+     * @endcode
+     */
+    void printDetails(void);
+
+    /**
+     * Test whether there are bytes available to be read in the
+     * FIFO buffers.
+     *
+     * @param[out] pipe_num Which pipe has the payload available
+     *
+     * @code
+     * uint8_t pipeNum;
+     * if(radio.available(&pipeNum)){
+     *   radio.read(&data,sizeof(data));
+     *   Serial.print("Got data on pipe");
+     *   Serial.println(pipeNum);
+     * }
+     * @endcode
+     * @return True if there is a payload available, false if none is
+     */
+    bool available(uint8_t* pipe_num);
 
-  /**
-   * Test whether there are bytes available to be read in the
-   * FIFO buffers. 
-   *
-   * @param[out] pipe_num Which pipe has the payload available
-   *  
-   * @code
-   * uint8_t pipeNum;
-   * if(radio.available(&pipeNum)){
-   *   radio.read(&data,sizeof(data));
-   *   Serial.print("Got data on pipe");
-   *   Serial.println(pipeNum);
-   * }
-   * @endcode
-   * @return True if there is a payload available, false if none is
-   */
-  bool available(uint8_t* pipe_num);
+    /**
+     * Check if the radio needs to be read. Can be used to prevent data loss
+     * @return True if all three 32-byte radio buffers are full
+     */
+    bool rxFifoFull();
 
-  /**
-   * Check if the radio needs to be read. Can be used to prevent data loss
-   * @return True if all three 32-byte radio buffers are full
-   */
-  bool rxFifoFull();
+    /**
+     * Enter low-power mode
+     *
+     * To return to normal power mode, call powerUp().
+     *
+     * @note After calling startListening(), a basic radio will consume about 13.5mA
+     * at max PA level.
+     * During active transmission, the radio will consume about 11.5mA, but this will
+     * be reduced to 26uA (.026mA) between sending.
+     * In full powerDown mode, the radio will consume approximately 900nA (.0009mA)
+     *
+     * @code
+     * radio.powerDown();
+     * avr_enter_sleep_mode(); // Custom function to sleep the device
+     * radio.powerUp();
+     * @endcode
+     */
+    void powerDown(void);
 
-  /**
-   * Enter low-power mode
-   *
-   * To return to normal power mode, call powerUp().
-   *
-   * @note After calling startListening(), a basic radio will consume about 13.5mA
-   * at max PA level.
-   * During active transmission, the radio will consume about 11.5mA, but this will
-   * be reduced to 26uA (.026mA) between sending.
-   * In full powerDown mode, the radio will consume approximately 900nA (.0009mA)   
-   *
-   * @code
-   * radio.powerDown();
-   * avr_enter_sleep_mode(); // Custom function to sleep the device
-   * radio.powerUp();
-   * @endcode
-   */
-  void powerDown(void);
+    /**
+     * Leave low-power mode - required for normal radio operation after calling powerDown()
+     *
+     * To return to low power mode, call powerDown().
+     * @note This will take up to 5ms for maximum compatibility
+     */
+    void powerUp(void) ;
 
-  /**
-   * Leave low-power mode - required for normal radio operation after calling powerDown()
-   * 
-   * To return to low power mode, call powerDown().
-   * @note This will take up to 5ms for maximum compatibility 
-   */
-  void powerUp(void) ;
-
-  /**
-  * Write for single NOACK writes. Optionally disables acknowledgements/autoretries for a single write.
-  *
-  * @note enableDynamicAck() must be called to enable this feature
-  *
-  * Can be used with enableAckPayload() to request a response
-  * @see enableDynamicAck()
-  * @see setAutoAck()
-  * @see write()
-  *
-  * @param buf Pointer to the data to be sent
-  * @param len Number of bytes to be sent
-  * @param multicast Request ACK (0), NOACK (1)
-  */
-  bool write( const void* buf, uint8_t len, const bool multicast );
+    /**
+    * Write for single NOACK writes. Optionally disables acknowledgements/autoretries for a single write.
+    *
+    * @note enableDynamicAck() must be called to enable this feature
+    *
+    * Can be used with enableAckPayload() to request a response
+    * @see enableDynamicAck()
+    * @see setAutoAck()
+    * @see write()
+    *
+    * @param buf Pointer to the data to be sent
+    * @param len Number of bytes to be sent
+    * @param multicast Request ACK (0), NOACK (1)
+    */
+    bool write( const void* buf, uint8_t len, const bool multicast );
 
-  /**
-   * This will not block until the 3 FIFO buffers are filled with data.
-   * Once the FIFOs are full, writeFast will simply wait for success or
-   * timeout, and return 1 or 0 respectively. From a user perspective, just
-   * keep trying to send the same data. The library will keep auto retrying
-   * the current payload using the built in functionality.
-   * @warning It is important to never keep the nRF24L01 in TX mode and FIFO full for more than 4ms at a time. If the auto
-   * retransmit is enabled, the nRF24L01 is never in TX mode long enough to disobey this rule. Allow the FIFO
-   * to clear by issuing txStandBy() or ensure appropriate time between transmissions.
-   *
-   * @code
-   * Example (Partial blocking):
-   *
-   *            radio.writeFast(&buf,32);  // Writes 1 payload to the buffers
-   *            txStandBy();               // Returns 0 if failed. 1 if success. Blocks only until MAX_RT timeout or success. Data flushed on fail.
-   *
-   *            radio.writeFast(&buf,32);  // Writes 1 payload to the buffers
-   *            txStandBy(1000);           // Using extended timeouts, returns 1 if success. Retries failed payloads for 1 seconds before returning 0.
-   * @endcode
-   *
-   * @see txStandBy()
-   * @see write()
-   * @see writeBlocking()
-   *
-   * @param buf Pointer to the data to be sent
-   * @param len Number of bytes to be sent
-   * @return True if the payload was delivered successfully false if not
-   */
-  bool writeFast( const void* buf, uint8_t len );
+    /**
+     * This will not block until the 3 FIFO buffers are filled with data.
+     * Once the FIFOs are full, writeFast will simply wait for success or
+     * timeout, and return 1 or 0 respectively. From a user perspective, just
+     * keep trying to send the same data. The library will keep auto retrying
+     * the current payload using the built in functionality.
+     * @warning It is important to never keep the nRF24L01 in TX mode and FIFO full for more than 4ms at a time. If the auto
+     * retransmit is enabled, the nRF24L01 is never in TX mode long enough to disobey this rule. Allow the FIFO
+     * to clear by issuing txStandBy() or ensure appropriate time between transmissions.
+     *
+     * @code
+     * Example (Partial blocking):
+     *
+     *            radio.writeFast(&buf,32);  // Writes 1 payload to the buffers
+     *            txStandBy();               // Returns 0 if failed. 1 if success. Blocks only until MAX_RT timeout or success. Data flushed on fail.
+     *
+     *            radio.writeFast(&buf,32);  // Writes 1 payload to the buffers
+     *            txStandBy(1000);           // Using extended timeouts, returns 1 if success. Retries failed payloads for 1 seconds before returning 0.
+     * @endcode
+     *
+     * @see txStandBy()
+     * @see write()
+     * @see writeBlocking()
+     *
+     * @param buf Pointer to the data to be sent
+     * @param len Number of bytes to be sent
+     * @return True if the payload was delivered successfully false if not
+     */
+    bool writeFast( const void* buf, uint8_t len );
+
+    /**
+    * WriteFast for single NOACK writes. Disables acknowledgements/autoretries for a single write.
+    *
+    * @note enableDynamicAck() must be called to enable this feature
+    * @see enableDynamicAck()
+    * @see setAutoAck()
+    *
+    * @param buf Pointer to the data to be sent
+    * @param len Number of bytes to be sent
+    * @param multicast Request ACK (0) or NOACK (1)
+    */
+    bool writeFast( const void* buf, uint8_t len, const bool multicast );
 
-  /**
-  * WriteFast for single NOACK writes. Disables acknowledgements/autoretries for a single write.
-  *
-  * @note enableDynamicAck() must be called to enable this feature
-  * @see enableDynamicAck()
-  * @see setAutoAck()
-  *
-  * @param buf Pointer to the data to be sent
-  * @param len Number of bytes to be sent
-  * @param multicast Request ACK (0) or NOACK (1)
-  */
-  bool writeFast( const void* buf, uint8_t len, const bool multicast );
-
-  /**
-   * This function extends the auto-retry mechanism to any specified duration.
-   * It will not block until the 3 FIFO buffers are filled with data.
-   * If so the library will auto retry until a new payload is written
-   * or the user specified timeout period is reached.
-   * @warning It is important to never keep the nRF24L01 in TX mode and FIFO full for more than 4ms at a time. If the auto
-   * retransmit is enabled, the nRF24L01 is never in TX mode long enough to disobey this rule. Allow the FIFO
-   * to clear by issuing txStandBy() or ensure appropriate time between transmissions.
-   *
-   * @code
-   * Example (Full blocking):
-   *
-   *            radio.writeBlocking(&buf,32,1000); //Wait up to 1 second to write 1 payload to the buffers
-   *            txStandBy(1000);                   //Wait up to 1 second for the payload to send. Return 1 if ok, 0 if failed.
-   *                                               //Blocks only until user timeout or success. Data flushed on fail.
-   * @endcode
-   * @note If used from within an interrupt, the interrupt should be disabled until completion, and sei(); called to enable millis().
-   * @see txStandBy()
-   * @see write()
-   * @see writeFast()
-   *
-   * @param buf Pointer to the data to be sent
-   * @param len Number of bytes to be sent
-   * @param timeout User defined timeout in milliseconds.
-   * @return True if the payload was loaded into the buffer successfully false if not
-   */
-  bool writeBlocking( const void* buf, uint8_t len, uint32_t timeout );
+    /**
+     * This function extends the auto-retry mechanism to any specified duration.
+     * It will not block until the 3 FIFO buffers are filled with data.
+     * If so the library will auto retry until a new payload is written
+     * or the user specified timeout period is reached.
+     * @warning It is important to never keep the nRF24L01 in TX mode and FIFO full for more than 4ms at a time. If the auto
+     * retransmit is enabled, the nRF24L01 is never in TX mode long enough to disobey this rule. Allow the FIFO
+     * to clear by issuing txStandBy() or ensure appropriate time between transmissions.
+     *
+     * @code
+     * Example (Full blocking):
+     *
+     *            radio.writeBlocking(&buf,32,1000); //Wait up to 1 second to write 1 payload to the buffers
+     *            txStandBy(1000);                   //Wait up to 1 second for the payload to send. Return 1 if ok, 0 if failed.
+     *                                               //Blocks only until user timeout or success. Data flushed on fail.
+     * @endcode
+     * @note If used from within an interrupt, the interrupt should be disabled until completion, and sei(); called to enable millis().
+     * @see txStandBy()
+     * @see write()
+     * @see writeFast()
+     *
+     * @param buf Pointer to the data to be sent
+     * @param len Number of bytes to be sent
+     * @param timeout User defined timeout in milliseconds.
+     * @return True if the payload was loaded into the buffer successfully false if not
+     */
+    bool writeBlocking( const void* buf, uint8_t len, uint32_t timeout );
 
-  /**
-   * This function should be called as soon as transmission is finished to
-   * drop the radio back to STANDBY-I mode. If not issued, the radio will
-   * remain in STANDBY-II mode which, per the data sheet, is not a recommended
-   * operating mode.
-   *
-   * @note When transmitting data in rapid succession, it is still recommended by
-   * the manufacturer to drop the radio out of TX or STANDBY-II mode if there is
-   * time enough between sends for the FIFOs to empty. This is not required if auto-ack
-   * is enabled.
-   *
-   * Relies on built-in auto retry functionality.
-   *
-   * @code
-   * Example (Partial blocking):
-   *
-   *            radio.writeFast(&buf,32);
-   *            radio.writeFast(&buf,32);
-   *            radio.writeFast(&buf,32);  //Fills the FIFO buffers up
-   *            bool ok = txStandBy();     //Returns 0 if failed. 1 if success.
-   *                                       //Blocks only until MAX_RT timeout or success. Data flushed on fail.
-   * @endcode
-   * @see txStandBy(unsigned long timeout)
-   * @return True if transmission is successful
-   *
-   */
-   bool txStandBy();
+    /**
+     * This function should be called as soon as transmission is finished to
+     * drop the radio back to STANDBY-I mode. If not issued, the radio will
+     * remain in STANDBY-II mode which, per the data sheet, is not a recommended
+     * operating mode.
+     *
+     * @note When transmitting data in rapid succession, it is still recommended by
+     * the manufacturer to drop the radio out of TX or STANDBY-II mode if there is
+     * time enough between sends for the FIFOs to empty. This is not required if auto-ack
+     * is enabled.
+     *
+     * Relies on built-in auto retry functionality.
+     *
+     * @code
+     * Example (Partial blocking):
+     *
+     *            radio.writeFast(&buf,32);
+     *            radio.writeFast(&buf,32);
+     *            radio.writeFast(&buf,32);  //Fills the FIFO buffers up
+     *            bool ok = txStandBy();     //Returns 0 if failed. 1 if success.
+     *                                       //Blocks only until MAX_RT timeout or success. Data flushed on fail.
+     * @endcode
+     * @see txStandBy(unsigned long timeout)
+     * @return True if transmission is successful
+     *
+     */
+    bool txStandBy();
 
-  /**
-   * This function allows extended blocking and auto-retries per a user defined timeout
-   * @code
-   *    Fully Blocking Example:
-   *
-   *            radio.writeFast(&buf,32);
-   *            radio.writeFast(&buf,32);
-   *            radio.writeFast(&buf,32);   //Fills the FIFO buffers up
-   *            bool ok = txStandBy(1000);  //Returns 0 if failed after 1 second of retries. 1 if success.
-   *                                        //Blocks only until user defined timeout or success. Data flushed on fail.
-   * @endcode
-   * @note If used from within an interrupt, the interrupt should be disabled until completion, and sei(); called to enable millis().
-   * @param timeout Number of milliseconds to retry failed payloads
-   * @return True if transmission is successful
-   *
-   */
-   bool txStandBy(uint32_t timeout, bool startTx = 0);
+    /**
+     * This function allows extended blocking and auto-retries per a user defined timeout
+     * @code
+     *    Fully Blocking Example:
+     *
+     *            radio.writeFast(&buf,32);
+     *            radio.writeFast(&buf,32);
+     *            radio.writeFast(&buf,32);   //Fills the FIFO buffers up
+     *            bool ok = txStandBy(1000);  //Returns 0 if failed after 1 second of retries. 1 if success.
+     *                                        //Blocks only until user defined timeout or success. Data flushed on fail.
+     * @endcode
+     * @note If used from within an interrupt, the interrupt should be disabled until completion, and sei(); called to enable millis().
+     * @param timeout Number of milliseconds to retry failed payloads
+     * @return True if transmission is successful
+     *
+     */
+    bool txStandBy(uint32_t timeout, bool startTx = 0);
 
-  /**
-   * Write an ack payload for the specified pipe
-   *
-   * The next time a message is received on @p pipe, the data in @p buf will
-   * be sent back in the acknowledgement.
-   * @see enableAckPayload()
-   * @see enableDynamicPayloads()
-   * @warning Only three of these can be pending at any time as there are only 3 FIFO buffers.<br> Dynamic payloads must be enabled.
-   * @note Ack payloads are handled automatically by the radio chip when a payload is received. Users should generally
-   * write an ack payload as soon as startListening() is called, so one is available when a regular payload is received.
-   * @note Ack payloads are dynamic payloads. This only works on pipes 0&1 by default. Call 
-   * enableDynamicPayloads() to enable on all pipes.
-   *
-   * @param pipe Which pipe# (typically 1-5) will get this response.
-   * @param buf Pointer to data that is sent
-   * @param len Length of the data to send, up to 32 bytes max.  Not affected
-   * by the static payload set by setPayloadSize().
-   */
-  void writeAckPayload(uint8_t pipe, const void* buf, uint8_t len);
+    /**
+     * Write an ack payload for the specified pipe
+     *
+     * The next time a message is received on @p pipe, the data in @p buf will
+     * be sent back in the acknowledgement.
+     * @see enableAckPayload()
+     * @see enableDynamicPayloads()
+     * @warning Only three of these can be pending at any time as there are only 3 FIFO buffers.<br> Dynamic payloads must be enabled.
+     * @note Ack payloads are handled automatically by the radio chip when a payload is received. Users should generally
+     * write an ack payload as soon as startListening() is called, so one is available when a regular payload is received.
+     * @note Ack payloads are dynamic payloads. This only works on pipes 0&1 by default. Call
+     * enableDynamicPayloads() to enable on all pipes.
+     *
+     * @param pipe Which pipe# (typically 1-5) will get this response.
+     * @param buf Pointer to data that is sent
+     * @param len Length of the data to send, up to 32 bytes max.  Not affected
+     * by the static payload set by setPayloadSize().
+     */
+    void writeAckPayload(uint8_t pipe, const void* buf, uint8_t len);
 
-  /**
-   * Determine if an ack payload was received in the most recent call to
-   * write(). The regular available() can also be used.
-   *
-   * Call read() to retrieve the ack payload.
-   *
-   * @return True if an ack payload is available.
-   */
-  bool isAckPayloadAvailable(void);
+    /**
+     * Determine if an ack payload was received in the most recent call to
+     * write(). The regular available() can also be used.
+     *
+     * Call read() to retrieve the ack payload.
+     *
+     * @return True if an ack payload is available.
+     */
+    bool isAckPayloadAvailable(void);
 
-  /**
-   * Call this when you get an interrupt to find out why
-   *
-   * Tells you what caused the interrupt, and clears the state of
-   * interrupts.
-   *
-   * @param[out] tx_ok The send was successful (TX_DS)
-   * @param[out] tx_fail The send failed, too many retries (MAX_RT)
-   * @param[out] rx_ready There is a message waiting to be read (RX_DS)
-   */
-  void whatHappened(bool& tx_ok,bool& tx_fail,bool& rx_ready);
+    /**
+     * Call this when you get an interrupt to find out why
+     *
+     * Tells you what caused the interrupt, and clears the state of
+     * interrupts.
+     *
+     * @param[out] tx_ok The send was successful (TX_DS)
+     * @param[out] tx_fail The send failed, too many retries (MAX_RT)
+     * @param[out] rx_ready There is a message waiting to be read (RX_DS)
+     */
+    void whatHappened(bool& tx_ok,bool& tx_fail,bool& rx_ready);
 
-  /**
-   * Non-blocking write to the open writing pipe used for buffered writes
-   *
-   * @note Optimization: This function now leaves the CE pin high, so the radio
-   * will remain in TX or STANDBY-II Mode until a txStandBy() command is issued. Can be used as an alternative to startWrite()
-   * if writing multiple payloads at once.
-   * @warning It is important to never keep the nRF24L01 in TX mode with FIFO full for more than 4ms at a time. If the auto
-   * retransmit/autoAck is enabled, the nRF24L01 is never in TX mode long enough to disobey this rule. Allow the FIFO
-   * to clear by issuing txStandBy() or ensure appropriate time between transmissions.
-   *
-   * @see write()
-   * @see writeFast()
-   * @see startWrite()
-   * @see writeBlocking()
-   *
-   * For single noAck writes see:
-   * @see enableDynamicAck()
-   * @see setAutoAck()
-   *
-   * @param buf Pointer to the data to be sent
-   * @param len Number of bytes to be sent
-   * @param multicast Request ACK (0) or NOACK (1)
-   * @return True if the payload was delivered successfully false if not
-   */
-  void startFastWrite( const void* buf, uint8_t len, const bool multicast, bool startTx = 1 );
+    /**
+     * Non-blocking write to the open writing pipe used for buffered writes
+     *
+     * @note Optimization: This function now leaves the CE pin high, so the radio
+     * will remain in TX or STANDBY-II Mode until a txStandBy() command is issued. Can be used as an alternative to startWrite()
+     * if writing multiple payloads at once.
+     * @warning It is important to never keep the nRF24L01 in TX mode with FIFO full for more than 4ms at a time. If the auto
+     * retransmit/autoAck is enabled, the nRF24L01 is never in TX mode long enough to disobey this rule. Allow the FIFO
+     * to clear by issuing txStandBy() or ensure appropriate time between transmissions.
+     *
+     * @see write()
+     * @see writeFast()
+     * @see startWrite()
+     * @see writeBlocking()
+     *
+     * For single noAck writes see:
+     * @see enableDynamicAck()
+     * @see setAutoAck()
+     *
+     * @param buf Pointer to the data to be sent
+     * @param len Number of bytes to be sent
+     * @param multicast Request ACK (0) or NOACK (1)
+     * @return True if the payload was delivered successfully false if not
+     */
+    void startFastWrite( const void* buf, uint8_t len, const bool multicast, bool startTx = 1 );
 
-  /**
-   * Non-blocking write to the open writing pipe
-   *
-   * Just like write(), but it returns immediately. To find out what happened
-   * to the send, catch the IRQ and then call whatHappened().
-   *
-   * @see write()
-   * @see writeFast()
-   * @see startFastWrite()
-   * @see whatHappened()
-   *
-   * For single noAck writes see:
-   * @see enableDynamicAck()
-   * @see setAutoAck()
-   *
-   * @param buf Pointer to the data to be sent
-   * @param len Number of bytes to be sent
-   * @param multicast Request ACK (0) or NOACK (1)
-   *
-   */
-  void startWrite( const void* buf, uint8_t len, const bool multicast );
-  
-  /**
-   * This function is mainly used internally to take advantage of the auto payload
-   * re-use functionality of the chip, but can be beneficial to users as well.
-   *
-   * The function will instruct the radio to re-use the data in the FIFO buffers,
-   * and instructs the radio to re-send once the timeout limit has been reached.
-   * Used by writeFast and writeBlocking to initiate retries when a TX failure
-   * occurs. Retries are automatically initiated except with the standard write().
-   * This way, data is not flushed from the buffer until switching between modes.
-   *
-   * @note This is to be used AFTER auto-retry fails if wanting to resend
-   * using the built-in payload reuse features.
-   * After issuing reUseTX(), it will keep reending the same payload forever or until
-   * a payload is written to the FIFO, or a flush_tx command is given.
-   */
-   void reUseTX();
+    /**
+     * Non-blocking write to the open writing pipe
+     *
+     * Just like write(), but it returns immediately. To find out what happened
+     * to the send, catch the IRQ and then call whatHappened().
+     *
+     * @see write()
+     * @see writeFast()
+     * @see startFastWrite()
+     * @see whatHappened()
+     *
+     * For single noAck writes see:
+     * @see enableDynamicAck()
+     * @see setAutoAck()
+     *
+     * @param buf Pointer to the data to be sent
+     * @param len Number of bytes to be sent
+     * @param multicast Request ACK (0) or NOACK (1)
+     *
+     */
+    void startWrite( const void* buf, uint8_t len, const bool multicast );
 
-  /**
-   * Empty the transmit buffer. This is generally not required in standard operation.
-   * May be required in specific cases after stopListening() , if operating at 250KBPS data rate.
-   *
-   * @return Current value of status register
-   */
-  uint8_t flush_tx(void);
+    /**
+     * This function is mainly used internally to take advantage of the auto payload
+     * re-use functionality of the chip, but can be beneficial to users as well.
+     *
+     * The function will instruct the radio to re-use the data in the FIFO buffers,
+     * and instructs the radio to re-send once the timeout limit has been reached.
+     * Used by writeFast and writeBlocking to initiate retries when a TX failure
+     * occurs. Retries are automatically initiated except with the standard write().
+     * This way, data is not flushed from the buffer until switching between modes.
+     *
+     * @note This is to be used AFTER auto-retry fails if wanting to resend
+     * using the built-in payload reuse features.
+     * After issuing reUseTX(), it will keep reending the same payload forever or until
+     * a payload is written to the FIFO, or a flush_tx command is given.
+     */
+    void reUseTX();
 
-  /**
-   * Test whether there was a carrier on the line for the
-   * previous listening period.
-   *
-   * Useful to check for interference on the current channel.
-   *
-   * @return true if was carrier, false if not
-   */
-  bool testCarrier(void);
+    /**
+     * Empty the transmit buffer. This is generally not required in standard operation.
+     * May be required in specific cases after stopListening() , if operating at 250KBPS data rate.
+     *
+     * @return Current value of status register
+     */
+    uint8_t flush_tx(void);
+
+    /**
+     * Test whether there was a carrier on the line for the
+     * previous listening period.
+     *
+     * Useful to check for interference on the current channel.
+     *
+     * @return true if was carrier, false if not
+     */
+    bool testCarrier(void);
 
-  /**
-   * Test whether a signal (carrier or otherwise) greater than
-   * or equal to -64dBm is present on the channel. Valid only
-   * on nRF24L01P (+) hardware. On nRF24L01, use testCarrier().
-   *
-   * Useful to check for interference on the current channel and
-   * channel hopping strategies.
-   *
-   * @code
-   * bool goodSignal = radio.testRPD();
-   * if(radio.available()){
-   *    Serial.println(goodSignal ? "Strong signal > 64dBm" : "Weak signal < 64dBm" );
-   *    radio.read(0,0);
-   * }
-   * @endcode
-   * @return true if signal => -64dBm, false if not
-   */
-  bool testRPD(void) ;
+    /**
+     * Test whether a signal (carrier or otherwise) greater than
+     * or equal to -64dBm is present on the channel. Valid only
+     * on nRF24L01P (+) hardware. On nRF24L01, use testCarrier().
+     *
+     * Useful to check for interference on the current channel and
+     * channel hopping strategies.
+     *
+     * @code
+     * bool goodSignal = radio.testRPD();
+     * if(radio.available()){
+     *    Serial.println(goodSignal ? "Strong signal > 64dBm" : "Weak signal < 64dBm" );
+     *    radio.read(0,0);
+     * }
+     * @endcode
+     * @return true if signal => -64dBm, false if not
+     */
+    bool testRPD(void) ;
 
-  /**
-   * Test whether this is a real radio, or a mock shim for
-   * debugging.  Setting either pin to 0xff is the way to
-   * indicate that this is not a real radio.
-   *
-   * @return true if this is a legitimate radio
-   */
-  bool isValid() { return ce_pin != 0xff && csn_pin != 0xff; }
-  
-   /**
-   * Close a pipe after it has been previously opened.
-   * Can be safely called without having previously opened a pipe.
-   * @param pipe Which pipe # to close, 0-5.
-   */
-  void closeReadingPipe( uint8_t pipe ) ;
+    /**
+     * Test whether this is a real radio, or a mock shim for
+     * debugging.  Setting either pin to 0xff is the way to
+     * indicate that this is not a real radio.
+     *
+     * @return true if this is a legitimate radio
+     */
+    bool isValid() {
+        return ce_pin != 0xff && csn_pin != 0xff;
+    }
+
+    /**
+    * Close a pipe after it has been previously opened.
+    * Can be safely called without having previously opened a pipe.
+    * @param pipe Which pipe # to close, 0-5.
+    */
+    void closeReadingPipe( uint8_t pipe ) ;
 
-   /**
-   * Enable error detection by un-commenting #define FAILURE_HANDLING in RF24_config.h
-   * If a failure has been detected, it usually indicates a hardware issue. By default the library
-   * will cease operation when a failure is detected.  
-   * This should allow advanced users to detect and resolve intermittent hardware issues.  
-   *   
-   * In most cases, the radio must be re-enabled via radio.begin(); and the appropriate settings
-   * applied after a failure occurs, if wanting to re-enable the device immediately.
-   * 
-   * Usage: (Failure handling must be enabled per above)
-   *  @code
-   *  if(radio.failureDetected){ 
-   *    radio.begin();                       // Attempt to re-configure the radio with defaults
-   *    radio.failureDetected = 0;           // Reset the detection value
-   *    radio.openWritingPipe(addresses[1]); // Re-configure pipe addresses
-   *    radio.openReadingPipe(1,addresses[0]);
-   *    report_failure();                    // Blink leds, send a message, etc. to indicate failure
-   *  }
-   * @endcode
-  */
-  //#if defined (FAILURE_HANDLING)
-    bool failureDetected; 
-  //#endif
-    
-  /**@}*/
+    /**
+    * Enable error detection by un-commenting #define FAILURE_HANDLING in RF24_config.h
+    * If a failure has been detected, it usually indicates a hardware issue. By default the library
+    * will cease operation when a failure is detected.
+    * This should allow advanced users to detect and resolve intermittent hardware issues.
+    *
+    * In most cases, the radio must be re-enabled via radio.begin(); and the appropriate settings
+    * applied after a failure occurs, if wanting to re-enable the device immediately.
+    *
+    * Usage: (Failure handling must be enabled per above)
+    *  @code
+    *  if(radio.failureDetected){
+    *    radio.begin();                       // Attempt to re-configure the radio with defaults
+    *    radio.failureDetected = 0;           // Reset the detection value
+    *    radio.openWritingPipe(addresses[1]); // Re-configure pipe addresses
+    *    radio.openReadingPipe(1,addresses[0]);
+    *    report_failure();                    // Blink leds, send a message, etc. to indicate failure
+    *  }
+    * @endcode
+    */
+    //#if defined (FAILURE_HANDLING)
+    bool failureDetected;
+    //#endif
+
+    /**@}*/
 
-  /**@}*/
-  /**
-   * @name Optional Configurators
-   *
-   *  Methods you can use to get or set the configuration of the chip.
-   *  None are required.  Calling begin() sets up a reasonable set of
-   *  defaults.
-   */
-  /**@{*/
+    /**@}*/
+    /**
+     * @name Optional Configurators
+     *
+     *  Methods you can use to get or set the configuration of the chip.
+     *  None are required.  Calling begin() sets up a reasonable set of
+     *  defaults.
+     */
+    /**@{*/
 
-  /**
-  * Set the address width from 3 to 5 bytes (24, 32 or 40 bit)
-  *
-  * @param a_width The address width to use: 3,4 or 5
-  */
+    /**
+    * Set the address width from 3 to 5 bytes (24, 32 or 40 bit)
+    *
+    * @param a_width The address width to use: 3,4 or 5
+    */
 
-  void setAddressWidth(uint8_t a_width);
-  
-  /**
-   * Set the number and delay of retries upon failed submit
-   *
-   * @param delay How long to wait between each retry, in multiples of 250us,
-   * max is 15.  0 means 250us, 15 means 4000us.
-   * @param count How many retries before giving up, max 15
-   */
-  void setRetries(uint8_t delay, uint8_t count);
+    void setAddressWidth(uint8_t a_width);
 
-  /**
-   * Set RF communication channel
-   *
-   * @param channel Which RF channel to communicate on, 0-127
-   */
-  void setChannel(uint8_t channel);
-  
     /**
-   * Get RF communication channel
-   *
-   * @return The currently configured RF Channel
-   */
-  uint8_t getChannel(void);
+     * Set the number and delay of retries upon failed submit
+     *
+     * @param delay How long to wait between each retry, in multiples of 250us,
+     * max is 15.  0 means 250us, 15 means 4000us.
+     * @param count How many retries before giving up, max 15
+     */
+    void setRetries(uint8_t delay, uint8_t count);
+
+    /**
+     * Set RF communication channel
+     *
+     * @param channel Which RF channel to communicate on, 0-127
+     */
+    void setChannel(uint8_t channel);
 
-  /**
-   * Set Static Payload Size
-   *
-   * This implementation uses a pre-stablished fixed payload size for all
-   * transmissions.  If this method is never called, the driver will always
-   * transmit the maximum payload size (32 bytes), no matter how much
-   * was sent to write().
-   *
-   * @todo Implement variable-sized payloads feature
-   *
-   * @param size The number of bytes in the payload
-   */
-  void setPayloadSize(uint8_t size);
+    /**
+    * Get RF communication channel
+    *
+    * @return The currently configured RF Channel
+    */
+    uint8_t getChannel(void);
 
-  /**
-   * Get Static Payload Size
-   *
-   * @see setPayloadSize()
-   *
-   * @return The number of bytes in the payload
-   */
-  uint8_t getPayloadSize(void);
+    /**
+     * Set Static Payload Size
+     *
+     * This implementation uses a pre-stablished fixed payload size for all
+     * transmissions.  If this method is never called, the driver will always
+     * transmit the maximum payload size (32 bytes), no matter how much
+     * was sent to write().
+     *
+     * @todo Implement variable-sized payloads feature
+     *
+     * @param size The number of bytes in the payload
+     */
+    void setPayloadSize(uint8_t size);
 
-  /**
-   * Get Dynamic Payload Size
-   *
-   * For dynamic payloads, this pulls the size of the payload off
-   * the chip
-   *
-   * @note Corrupt packets are now detected and flushed per the
-   * manufacturer.
-   * @code
-   * if(radio.available()){
-   *   if(radio.getDynamicPayloadSize() < 1){
-   *     // Corrupt payload has been flushed
-   *     return; 
-   *   }
-   *   radio.read(&data,sizeof(data));
-   * }
-   * @endcode
-   *
-   * @return Payload length of last-received dynamic payload
-   */
-  uint8_t getDynamicPayloadSize(void);
+    /**
+     * Get Static Payload Size
+     *
+     * @see setPayloadSize()
+     *
+     * @return The number of bytes in the payload
+     */
+    uint8_t getPayloadSize(void);
 
-  /**
-   * Enable custom payloads on the acknowledge packets
-   *
-   * Ack payloads are a handy way to return data back to senders without
-   * manually changing the radio modes on both units.
-   *
-   * @note Ack payloads are dynamic payloads. This only works on pipes 0&1 by default. Call 
-   * enableDynamicPayloads() to enable on all pipes.
-   */
-  void enableAckPayload(void);
+    /**
+     * Get Dynamic Payload Size
+     *
+     * For dynamic payloads, this pulls the size of the payload off
+     * the chip
+     *
+     * @note Corrupt packets are now detected and flushed per the
+     * manufacturer.
+     * @code
+     * if(radio.available()){
+     *   if(radio.getDynamicPayloadSize() < 1){
+     *     // Corrupt payload has been flushed
+     *     return;
+     *   }
+     *   radio.read(&data,sizeof(data));
+     * }
+     * @endcode
+     *
+     * @return Payload length of last-received dynamic payload
+     */
+    uint8_t getDynamicPayloadSize(void);
 
-  /**
-   * Enable dynamically-sized payloads
-   *
-   * This way you don't always have to send large packets just to send them
-   * once in a while.  This enables dynamic payloads on ALL pipes.
-   *
-   */
-  void enableDynamicPayloads(void);
-  
-  /**
-   * Enable dynamic ACKs (single write multicast or unicast) for chosen messages
-   *
-   * @note To enable full multicast or per-pipe multicast, use setAutoAck()
-   *
-   * @warning This MUST be called prior to attempting single write NOACK calls
-   * @code
-   * radio.enableDynamicAck();
-   * radio.write(&data,32,1);  // Sends a payload with no acknowledgement requested
-   * radio.write(&data,32,0);  // Sends a payload using auto-retry/autoACK
-   * @endcode
-   */
-  void enableDynamicAck();
-  
-  /**
-   * Determine whether the hardware is an nRF24L01+ or not.
-   *
-   * @return true if the hardware is nRF24L01+ (or compatible) and false
-   * if its not.
-   */
-  bool isPVariant(void) ;
+    /**
+     * Enable custom payloads on the acknowledge packets
+     *
+     * Ack payloads are a handy way to return data back to senders without
+     * manually changing the radio modes on both units.
+     *
+     * @note Ack payloads are dynamic payloads. This only works on pipes 0&1 by default. Call
+     * enableDynamicPayloads() to enable on all pipes.
+     */
+    void enableAckPayload(void);
+
+    /**
+     * Enable dynamically-sized payloads
+     *
+     * This way you don't always have to send large packets just to send them
+     * once in a while.  This enables dynamic payloads on ALL pipes.
+     *
+     */
+    void enableDynamicPayloads(void);
 
-  /**
-   * Enable or disable auto-acknowlede packets
-   *
-   * This is enabled by default, so it's only needed if you want to turn
-   * it off for some reason.
-   *
-   * @param enable Whether to enable (true) or disable (false) auto-acks
-   */
-  void setAutoAck(bool enable);
+    /**
+     * Enable dynamic ACKs (single write multicast or unicast) for chosen messages
+     *
+     * @note To enable full multicast or per-pipe multicast, use setAutoAck()
+     *
+     * @warning This MUST be called prior to attempting single write NOACK calls
+     * @code
+     * radio.enableDynamicAck();
+     * radio.write(&data,32,1);  // Sends a payload with no acknowledgement requested
+     * radio.write(&data,32,0);  // Sends a payload using auto-retry/autoACK
+     * @endcode
+     */
+    void enableDynamicAck();
+
+    /**
+     * Determine whether the hardware is an nRF24L01+ or not.
+     *
+     * @return true if the hardware is nRF24L01+ (or compatible) and false
+     * if its not.
+     */
+    bool isPVariant(void) ;
 
-  /**
-   * Enable or disable auto-acknowlede packets on a per pipeline basis.
-   *
-   * AA is enabled by default, so it's only needed if you want to turn
-   * it off/on for some reason on a per pipeline basis.
-   *
-   * @param pipe Which pipeline to modify
-   * @param enable Whether to enable (true) or disable (false) auto-acks
-   */
-  void setAutoAck( uint8_t pipe, bool enable ) ;
+    /**
+     * Enable or disable auto-acknowlede packets
+     *
+     * This is enabled by default, so it's only needed if you want to turn
+     * it off for some reason.
+     *
+     * @param enable Whether to enable (true) or disable (false) auto-acks
+     */
+    void setAutoAck(bool enable);
+
+    /**
+     * Enable or disable auto-acknowlede packets on a per pipeline basis.
+     *
+     * AA is enabled by default, so it's only needed if you want to turn
+     * it off/on for some reason on a per pipeline basis.
+     *
+     * @param pipe Which pipeline to modify
+     * @param enable Whether to enable (true) or disable (false) auto-acks
+     */
+    void setAutoAck( uint8_t pipe, bool enable ) ;
 
-  /**
-   * Set Power Amplifier (PA) level to one of four levels:
-   * RF24_PA_MIN, RF24_PA_LOW, RF24_PA_HIGH and RF24_PA_MAX
-   *
-   * The power levels correspond to the following output levels respectively:
-   * NRF24L01: -18dBm, -12dBm,-6dBM, and 0dBm
-   *
-   * SI24R1: -6dBm, 0dBm, 3dBM, and 7dBm.
-   *
-   * @param level Desired PA level.
-   */
-  void setPALevel ( uint8_t level );
+    /**
+     * Set Power Amplifier (PA) level to one of four levels:
+     * RF24_PA_MIN, RF24_PA_LOW, RF24_PA_HIGH and RF24_PA_MAX
+     *
+     * The power levels correspond to the following output levels respectively:
+     * NRF24L01: -18dBm, -12dBm,-6dBM, and 0dBm
+     *
+     * SI24R1: -6dBm, 0dBm, 3dBM, and 7dBm.
+     *
+     * @param level Desired PA level.
+     */
+    void setPALevel ( uint8_t level );
 
-  /**
-   * Fetches the current PA level.
-   *
-   * NRF24L01: -18dBm, -12dBm, -6dBm and 0dBm
-   * SI24R1:   -6dBm, 0dBm, 3dBm, 7dBm
-   *
-   * @return Returns values 0 to 3 representing the PA Level.
-   */
-   uint8_t getPALevel( void );
+    /**
+     * Fetches the current PA level.
+     *
+     * NRF24L01: -18dBm, -12dBm, -6dBm and 0dBm
+     * SI24R1:   -6dBm, 0dBm, 3dBm, 7dBm
+     *
+     * @return Returns values 0 to 3 representing the PA Level.
+     */
+    uint8_t getPALevel( void );
 
-  /**
-   * Set the transmission data rate
-   *
-   * @warning setting RF24_250KBPS will fail for non-plus units
-   *
-   * @param speed RF24_250KBPS for 250kbs, RF24_1MBPS for 1Mbps, or RF24_2MBPS for 2Mbps
-   * @return true if the change was successful
-   */
-  bool setDataRate(rf24_datarate_e speed);
+    /**
+     * Set the transmission data rate
+     *
+     * @warning setting RF24_250KBPS will fail for non-plus units
+     *
+     * @param speed RF24_250KBPS for 250kbs, RF24_1MBPS for 1Mbps, or RF24_2MBPS for 2Mbps
+     * @return true if the change was successful
+     */
+    bool setDataRate(rf24_datarate_e speed);
 
-  /**
-   * Fetches the transmission data rate
-   *
-   * @return Returns the hardware's currently configured datarate. The value
-   * is one of 250kbs, RF24_1MBPS for 1Mbps, or RF24_2MBPS, as defined in the
-   * rf24_datarate_e enum.
-   */
-  rf24_datarate_e getDataRate( void ) ;
+    /**
+     * Fetches the transmission data rate
+     *
+     * @return Returns the hardware's currently configured datarate. The value
+     * is one of 250kbs, RF24_1MBPS for 1Mbps, or RF24_2MBPS, as defined in the
+     * rf24_datarate_e enum.
+     */
+    rf24_datarate_e getDataRate( void ) ;
 
-  /**
-   * Set the CRC length
-   *
-   * @param length RF24_CRC_8 for 8-bit or RF24_CRC_16 for 16-bit
-   */
-  void setCRCLength(rf24_crclength_e length);
+    /**
+     * Set the CRC length
+     *
+     * @param length RF24_CRC_8 for 8-bit or RF24_CRC_16 for 16-bit
+     */
+    void setCRCLength(rf24_crclength_e length);
 
-  /**
-   * Get the CRC length
-   *
-   * @return RF24_DISABLED if disabled or RF24_CRC_8 for 8-bit or RF24_CRC_16 for 16-bit
-   */
-  rf24_crclength_e getCRCLength(void);
+    /**
+     * Get the CRC length
+     *
+     * @return RF24_DISABLED if disabled or RF24_CRC_8 for 8-bit or RF24_CRC_16 for 16-bit
+     */
+    rf24_crclength_e getCRCLength(void);
 
-  /**
-   * Disable CRC validation
-   *
-   * @warning CRC cannot be disabled if auto-ack/ESB is enabled.
-   */
-  void disableCRC( void ) ;
+    /**
+     * Disable CRC validation
+     *
+     * @warning CRC cannot be disabled if auto-ack/ESB is enabled.
+     */
+    void disableCRC( void ) ;
 
-  /**
-  * The radio will generate interrupt signals when a transmission is complete,
-  * a transmission fails, or a payload is received. This allows users to mask
-  * those interrupts to prevent them from generating a signal on the interrupt
-  * pin. Interrupts are enabled on the radio chip by default.
-  *
-  * @code
-  *     Mask all interrupts except the receive interrupt:
-  *
-  *     radio.maskIRQ(1,1,0);
-  * @endcode
-  *
-  * @param tx_ok  Mask transmission complete interrupts
-  * @param tx_fail  Mask transmit failure interrupts
-  * @param rx_ready Mask payload received interrupts
-  */
-  void maskIRQ(bool tx_ok,bool tx_fail,bool rx_ready);
-  
-  /**@}*/
-  /**
-   * @name Deprecated
-   *
-   *  Methods provided for backwards compabibility.
-   */
-  /**@{*/
+    /**
+    * The radio will generate interrupt signals when a transmission is complete,
+    * a transmission fails, or a payload is received. This allows users to mask
+    * those interrupts to prevent them from generating a signal on the interrupt
+    * pin. Interrupts are enabled on the radio chip by default.
+    *
+    * @code
+    *     Mask all interrupts except the receive interrupt:
+    *
+    *     radio.maskIRQ(1,1,0);
+    * @endcode
+    *
+    * @param tx_ok  Mask transmission complete interrupts
+    * @param tx_fail  Mask transmit failure interrupts
+    * @param rx_ready Mask payload received interrupts
+    */
+    void maskIRQ(bool tx_ok,bool tx_fail,bool rx_ready);
+
+    /**@}*/
+    /**
+     * @name Deprecated
+     *
+     *  Methods provided for backwards compabibility.
+     */
+    /**@{*/
 
 
-  /**
-   * Open a pipe for reading
-   * @note For compatibility with old code only, see new function
-   *
-   * @warning Pipes 1-5 should share the first 32 bits.
-   * Only the least significant byte should be unique, e.g.
-   * @code
-   *   openReadingPipe(1,0xF0F0F0F0AA);
-   *   openReadingPipe(2,0xF0F0F0F066);
-   * @endcode
-   *
-   * @warning Pipe 0 is also used by the writing pipe.  So if you open
-   * pipe 0 for reading, and then startListening(), it will overwrite the
-   * writing pipe.  Ergo, do an openWritingPipe() again before write().
-   *
-   * @param number Which pipe# to open, 0-5.
-   * @param address The 40-bit address of the pipe to open.
-   */
-  void openReadingPipe(uint8_t number, uint64_t address);
+    /**
+     * Open a pipe for reading
+     * @note For compatibility with old code only, see new function
+     *
+     * @warning Pipes 1-5 should share the first 32 bits.
+     * Only the least significant byte should be unique, e.g.
+     * @code
+     *   openReadingPipe(1,0xF0F0F0F0AA);
+     *   openReadingPipe(2,0xF0F0F0F066);
+     * @endcode
+     *
+     * @warning Pipe 0 is also used by the writing pipe.  So if you open
+     * pipe 0 for reading, and then startListening(), it will overwrite the
+     * writing pipe.  Ergo, do an openWritingPipe() again before write().
+     *
+     * @param number Which pipe# to open, 0-5.
+     * @param address The 40-bit address of the pipe to open.
+     */
+    void openReadingPipe(uint8_t number, uint64_t address);
 
-  /**
-   * Open a pipe for writing
-   * @note For compatibility with old code only, see new function
-   *
-   * Addresses are 40-bit hex values, e.g.:
-   *
-   * @code
-   *   openWritingPipe(0xF0F0F0F0F0);
-   * @endcode
-   *
-   * @param address The 40-bit address of the pipe to open.
-   */
-  void openWritingPipe(uint64_t address);
+    /**
+     * Open a pipe for writing
+     * @note For compatibility with old code only, see new function
+     *
+     * Addresses are 40-bit hex values, e.g.:
+     *
+     * @code
+     *   openWritingPipe(0xF0F0F0F0F0);
+     * @endcode
+     *
+     * @param address The 40-bit address of the pipe to open.
+     */
+    void openWritingPipe(uint64_t address);
 
 private:
 
-  /**
-   * @name Low-level internal interface.
-   *
-   *  Protected methods that address the chip directly.  Regular users cannot
-   *  ever call these.  They are documented for completeness and for developers who
-   *  may want to extend this class.
-   */
-  /**@{*/
+    /**
+     * @name Low-level internal interface.
+     *
+     *  Protected methods that address the chip directly.  Regular users cannot
+     *  ever call these.  They are documented for completeness and for developers who
+     *  may want to extend this class.
+     */
+    /**@{*/
 
-  /**
-   * Set chip select pin
-   *
-   * Running SPI bus at PI_CLOCK_DIV2 so we don't waste time transferring data
-   * and best of all, we make use of the radio's FIFO buffers. A lower speed
-   * means we're less likely to effectively leverage our FIFOs and pay a higher
-   * AVR runtime cost as toll.
-   *
-   * @param mode HIGH to take this unit off the SPI bus, LOW to put it on
-   */
-  void csn(bool mode);
+    /**
+     * Set chip select pin
+     *
+     * Running SPI bus at PI_CLOCK_DIV2 so we don't waste time transferring data
+     * and best of all, we make use of the radio's FIFO buffers. A lower speed
+     * means we're less likely to effectively leverage our FIFOs and pay a higher
+     * AVR runtime cost as toll.
+     *
+     * @param mode HIGH to take this unit off the SPI bus, LOW to put it on
+     */
+    void csn(bool mode);
 
-  /**
-   * Set chip enable
-   *
-   * @param level HIGH to actively begin transmission or LOW to put in standby.  Please see data sheet
-   * for a much more detailed description of this pin.
-   */
-  void ce(bool level);
+    /**
+     * Set chip enable
+     *
+     * @param level HIGH to actively begin transmission or LOW to put in standby.  Please see data sheet
+     * for a much more detailed description of this pin.
+     */
+    void ce(bool level);
 
-  /**
-   * Read a chunk of data in from a register
-   *
-   * @param reg Which register. Use constants from nRF24L01.h
-   * @param buf Where to put the data
-   * @param len How many bytes of data to transfer
-   * @return Current value of status register
-   */
-  uint8_t read_register(uint8_t reg, uint8_t* buf, uint8_t len);
+    /**
+     * Read a chunk of data in from a register
+     *
+     * @param reg Which register. Use constants from nRF24L01.h
+     * @param buf Where to put the data
+     * @param len How many bytes of data to transfer
+     * @return Current value of status register
+     */
+    uint8_t read_register(uint8_t reg, uint8_t* buf, uint8_t len);
 
-  /**
-   * Read single byte from a register
-   *
-   * @param reg Which register. Use constants from nRF24L01.h
-   * @return Current value of register @p reg
-   */
-  uint8_t read_register(uint8_t reg);
+    /**
+     * Read single byte from a register
+     *
+     * @param reg Which register. Use constants from nRF24L01.h
+     * @return Current value of register @p reg
+     */
+    uint8_t read_register(uint8_t reg);
 
-  /**
-   * Write a chunk of data to a register
-   *
-   * @param reg Which register. Use constants from nRF24L01.h
-   * @param buf Where to get the data
-   * @param len How many bytes of data to transfer
-   * @return Current value of status register
-   */
-  uint8_t write_register(uint8_t reg, const uint8_t* buf, uint8_t len);
+    /**
+     * Write a chunk of data to a register
+     *
+     * @param reg Which register. Use constants from nRF24L01.h
+     * @param buf Where to get the data
+     * @param len How many bytes of data to transfer
+     * @return Current value of status register
+     */
+    uint8_t write_register(uint8_t reg, const uint8_t* buf, uint8_t len);
 
-  /**
-   * Write a single byte to a register
-   *
-   * @param reg Which register. Use constants from nRF24L01.h
-   * @param value The new value to write
-   * @return Current value of status register
-   */
-  uint8_t write_register(uint8_t reg, uint8_t value);
+    /**
+     * Write a single byte to a register
+     *
+     * @param reg Which register. Use constants from nRF24L01.h
+     * @param value The new value to write
+     * @return Current value of status register
+     */
+    uint8_t write_register(uint8_t reg, uint8_t value);
 
-  /**
-   * Write the transmit payload
-   *
-   * The size of data written is the fixed payload size, see getPayloadSize()
-   *
-   * @param buf Where to get the data
-   * @param len Number of bytes to be sent
-   * @return Current value of status register
-   */
-  uint8_t write_payload(const void* buf, uint8_t len, const uint8_t writeType);
+    /**
+     * Write the transmit payload
+     *
+     * The size of data written is the fixed payload size, see getPayloadSize()
+     *
+     * @param buf Where to get the data
+     * @param len Number of bytes to be sent
+     * @return Current value of status register
+     */
+    uint8_t write_payload(const void* buf, uint8_t len, const uint8_t writeType);
 
-  /**
-   * Read the receive payload
-   *
-   * The size of data read is the fixed payload size, see getPayloadSize()
-   *
-   * @param buf Where to put the data
-   * @param len Maximum number of bytes to read
-   * @return Current value of status register
-   */
-  uint8_t read_payload(void* buf, uint8_t len);
+    /**
+     * Read the receive payload
+     *
+     * The size of data read is the fixed payload size, see getPayloadSize()
+     *
+     * @param buf Where to put the data
+     * @param len Maximum number of bytes to read
+     * @return Current value of status register
+     */
+    uint8_t read_payload(void* buf, uint8_t len);
 
-  /**
-   * Empty the receive buffer
-   *
-   * @return Current value of status register
-   */
-  uint8_t flush_rx(void);
+    /**
+     * Empty the receive buffer
+     *
+     * @return Current value of status register
+     */
+    uint8_t flush_rx(void);
 
-  /**
-   * Retrieve the current status of the chip
-   *
-   * @return Current value of status register
-   */
-  uint8_t get_status(void);
+    /**
+     * Retrieve the current status of the chip
+     *
+     * @return Current value of status register
+     */
+    uint8_t get_status(void);
 
-  #if !defined (MINIMAL)
-  /**
-   * Decode and print the given status to stdout
-   *
-   * @param status Status value to print
-   *
-   * @warning Does nothing if stdout is not defined.  See fdevopen in stdio.h
-   */
-  void print_status(uint8_t status);
+#if !defined (MINIMAL)
+    /**
+     * Decode and print the given status to stdout
+     *
+     * @param status Status value to print
+     *
+     * @warning Does nothing if stdout is not defined.  See fdevopen in stdio.h
+     */
+    void print_status(uint8_t status);
 
-  /**
-   * Decode and print the given 'observe_tx' value to stdout
-   *
-   * @param value The observe_tx value to print
-   *
-   * @warning Does nothing if stdout is not defined.  See fdevopen in stdio.h
-   */
-  void print_observe_tx(uint8_t value);
+    /**
+     * Decode and print the given 'observe_tx' value to stdout
+     *
+     * @param value The observe_tx value to print
+     *
+     * @warning Does nothing if stdout is not defined.  See fdevopen in stdio.h
+     */
+    void print_observe_tx(uint8_t value);
 
-  /**
-   * Print the name and value of an 8-bit register to stdout
-   *
-   * Optionally it can print some quantity of successive
-   * registers on the same line.  This is useful for printing a group
-   * of related registers on one line.
-   *
-   * @param name Name of the register
-   * @param reg Which register. Use constants from nRF24L01.h
-   * @param qty How many successive registers to print
-   */
-  void print_byte_register(const char* name, uint8_t reg, uint8_t qty = 1);
+    /**
+     * Print the name and value of an 8-bit register to stdout
+     *
+     * Optionally it can print some quantity of successive
+     * registers on the same line.  This is useful for printing a group
+     * of related registers on one line.
+     *
+     * @param name Name of the register
+     * @param reg Which register. Use constants from nRF24L01.h
+     * @param qty How many successive registers to print
+     */
+    void print_byte_register(const char* name, uint8_t reg, uint8_t qty = 1);
 
-  /**
-   * Print the name and value of a 40-bit address register to stdout
-   *
-   * Optionally it can print some quantity of successive
-   * registers on the same line.  This is useful for printing a group
-   * of related registers on one line.
-   *
-   * @param name Name of the register
-   * @param reg Which register. Use constants from nRF24L01.h
-   * @param qty How many successive registers to print
-   */
-  void print_address_register(const char* name, uint8_t reg, uint8_t qty = 1);
+    /**
+     * Print the name and value of a 40-bit address register to stdout
+     *
+     * Optionally it can print some quantity of successive
+     * registers on the same line.  This is useful for printing a group
+     * of related registers on one line.
+     *
+     * @param name Name of the register
+     * @param reg Which register. Use constants from nRF24L01.h
+     * @param qty How many successive registers to print
+     */
+    void print_address_register(const char* name, uint8_t reg, uint8_t qty = 1);
 #endif
-  /**
-   * Turn on or off the special features of the chip
-   *
-   * The chip has certain 'features' which are only available when the 'features'
-   * are enabled.  See the datasheet for details.
-   */
-  void toggle_features(void);
+    /**
+     * Turn on or off the special features of the chip
+     *
+     * The chip has certain 'features' which are only available when the 'features'
+     * are enabled.  See the datasheet for details.
+     */
+    void toggle_features(void);
 
-  /**
-   * Built in spi transfer function to simplify repeating code repeating code
-   */
+    /**
+     * Built in spi transfer function to simplify repeating code repeating code
+     */
+
+    uint8_t spiTrans(uint8_t cmd);
 
-  uint8_t spiTrans(uint8_t cmd);
-  
-  #if defined (FAILURE_HANDLING) || defined (RF24_LINUX)
+#if defined (FAILURE_HANDLING) || defined (RF24_LINUX)
     void errNotify(void);
-  #endif
-  
-  /**@}*/
+#endif
+
+    /**@}*/
 
 };
 
@@ -1135,18 +1103,18 @@
  * @note When switching between sketches, the radio may need to be powered down to clear settings that are not "un-set" otherwise
  */
 
- /**
- * @example GettingStarted.cpp
- * <b>For Raspberry Pi</b><br>
- * <b>Updated: TMRh20 2014 </b><br>
- *
- * This is an example of how to use the RF24 class to communicate on a basic level. Configure and write this sketch to two
- * different nodes. Put one of the nodes into 'transmit' mode by connecting with the serial monitor and <br>
- * sending a 'T'. The ping node sends the current time to the pong node, which responds by sending the value
- * back. The ping node can then see how long the whole cycle took. <br>
- * @note For a more efficient call-response scenario see the GettingStarted_CallResponse.ino example.
- */
- 
+/**
+* @example GettingStarted.cpp
+* <b>For Raspberry Pi</b><br>
+* <b>Updated: TMRh20 2014 </b><br>
+*
+* This is an example of how to use the RF24 class to communicate on a basic level. Configure and write this sketch to two
+* different nodes. Put one of the nodes into 'transmit' mode by connecting with the serial monitor and <br>
+* sending a 'T'. The ping node sends the current time to the pong node, which responds by sending the value
+* back. The ping node can then see how long the whole cycle took. <br>
+* @note For a more efficient call-response scenario see the GettingStarted_CallResponse.ino example.
+*/
+
 /**
  * @example GettingStarted_CallResponse.ino
  * <b>For Arduino</b><br>
@@ -1158,27 +1126,27 @@
  * switch out of Primary Receiver mode to send back a payload, but having the option to switch to <br>
  * primary transmitter if wanting to initiate communication instead of respond to a commmunication.
  */
- 
- /**
- * @example GettingStarted_Call_Response.cpp
- * <b>For Raspberry Pi</b><br>
- * <b>New: TMRh20 2014</b><br>
- *
- * This example continues to make use of all the normal functionality of the radios including
- * the auto-ack and auto-retry features, but allows ack-payloads to be written optionlly as well. <br>
- * This allows very fast call-response communication, with the responding radio never having to
- * switch out of Primary Receiver mode to send back a payload, but having the option to switch to <br>
- * primary transmitter if wanting to initiate communication instead of respond to a commmunication.
- */
 
- /**
- * @example GettingStarted_HandlingData.ino
- * <b>Dec 2014 - TMRh20</b><br>
- *
- * This example demonstrates how to send multiple variables in a single payload and work with data. As usual, it is
- * generally important to include an incrementing value like millis() in the payloads to prevent errors.
- */
- 
+/**
+* @example GettingStarted_Call_Response.cpp
+* <b>For Raspberry Pi</b><br>
+* <b>New: TMRh20 2014</b><br>
+*
+* This example continues to make use of all the normal functionality of the radios including
+* the auto-ack and auto-retry features, but allows ack-payloads to be written optionlly as well. <br>
+* This allows very fast call-response communication, with the responding radio never having to
+* switch out of Primary Receiver mode to send back a payload, but having the option to switch to <br>
+* primary transmitter if wanting to initiate communication instead of respond to a commmunication.
+*/
+
+/**
+* @example GettingStarted_HandlingData.ino
+* <b>Dec 2014 - TMRh20</b><br>
+*
+* This example demonstrates how to send multiple variables in a single payload and work with data. As usual, it is
+* generally important to include an incrementing value like millis() in the payloads to prevent errors.
+*/
+
 /**
  * @example Transfer.ino
  * <b>For Arduino</b><br>
@@ -1189,17 +1157,17 @@
  * with the serial monitor and sending a 'T'.  The data transfer will begin,
  * with the receiver displaying the payload count. (32Byte Payloads) <br>
  */
- 
- /**
- * @example Transfer.cpp
- * <b>For Raspberry Pi</b><br>
- * This example demonstrates half-rate transfer using the FIFO buffers<br>
- *
- * It is an example of how to use the RF24 class.  Write this sketch to two
- * different nodes.  Put one of the nodes into 'transmit' mode by connecting <br>
- * with the serial monitor and sending a 'T'.  The data transfer will begin,
- * with the receiver displaying the payload count. (32Byte Payloads) <br>
- */
+
+/**
+* @example Transfer.cpp
+* <b>For Raspberry Pi</b><br>
+* This example demonstrates half-rate transfer using the FIFO buffers<br>
+*
+* It is an example of how to use the RF24 class.  Write this sketch to two
+* different nodes.  Put one of the nodes into 'transmit' mode by connecting <br>
+* with the serial monitor and sending a 'T'.  The data transfer will begin,
+* with the receiver displaying the payload count. (32Byte Payloads) <br>
+*/
 
 /**
  * @example TransferTimeouts.ino
@@ -1247,12 +1215,12 @@
  * Sleep functionality is built directly into my fork of the RF24Network library<br>
  */
 
- /**
- * @example pingpair_irq_simple.ino
- * <b>Dec 2014 - TMRh20</b><br>
- * This is an example of how to user interrupts to interact with the radio, with bidirectional communication.
- */
- 
+/**
+* @example pingpair_irq_simple.ino
+* <b>Dec 2014 - TMRh20</b><br>
+* This is an example of how to user interrupts to interact with the radio, with bidirectional communication.
+*/
+
 /**
  * @example pingpair_sleepy.ino
  * <b>Update: TMRh20</b><br>
@@ -1262,47 +1230,47 @@
  * ping/pong cycle, and the receiver sleeps between payloads. <br>
  */
 
- /**
- * @example rf24ping85.ino
- * <b>New: Contributed by https://github.com/tong67</b><br>
- * This is an example of how to use the RF24 class to communicate with ATtiny85 and other node. <br>
- */
- 
- /**
- * @example timingSearch3pin.ino
- * <b>New: Contributed by https://github.com/tong67</b><br>
- * This is an example of how to determine the correct timing for ATtiny when using only 3-pins
- */
-  
+/**
+* @example rf24ping85.ino
+* <b>New: Contributed by https://github.com/tong67</b><br>
+* This is an example of how to use the RF24 class to communicate with ATtiny85 and other node. <br>
+*/
+
+/**
+* @example timingSearch3pin.ino
+* <b>New: Contributed by https://github.com/tong67</b><br>
+* This is an example of how to determine the correct timing for ATtiny when using only 3-pins
+*/
+
 /**
  * @example pingpair_dyn.ino
  *
  * This is an example of how to use payloads of a varying (dynamic) size on Arduino.
  */
- 
- /**
- * @example pingpair_dyn.cpp
- *
- * This is an example of how to use payloads of a varying (dynamic) size on Raspberry Pi.
- */
+
+/**
+* @example pingpair_dyn.cpp
+*
+* This is an example of how to use payloads of a varying (dynamic) size on Raspberry Pi.
+*/
 
 /**
  * @example pingpair_dyn.py
  *
  * This is a python example for RPi of how to use payloads of a varying (dynamic) size.
- */ 
- 
+ */
+
 /**
  * @example pingpair_dyn.ino
  *
  * This is an example of how to use payloads of a varying (dynamic) size.
  */
- 
- /**
- * @example pingpair_dyn.ino
- *
- * This is an example of how to use payloads of a varying (dynamic) size.
- */
+
+/**
+* @example pingpair_dyn.ino
+*
+* This is an example of how to use payloads of a varying (dynamic) size.
+*/
 
 /**
  * @example scanner.ino
@@ -1354,7 +1322,7 @@
  * @li <a href="http://tmrh20.github.io/RF24/classRF24.html"><b>RF24</b> Class Documentation</a>
  * @li <a href="https://github.com/TMRh20/RF24/archive/master.zip"><b>Download</b></a>
  * @li <a href="https://github.com/tmrh20/RF24/"><b>Source Code</b></a>
- * @li <a href="http://tmrh20.blogspot.com/2014/03/high-speed-data-transfers-and-wireless.html"><b>My Blog:</b> RF24 Optimization Overview</a> 
+ * @li <a href="http://tmrh20.blogspot.com/2014/03/high-speed-data-transfers-and-wireless.html"><b>My Blog:</b> RF24 Optimization Overview</a>
  * @li <a href="http://www.nordicsemi.com/files/Product/data_sheet/nRF24L01_Product_Specification_v2_0.pdf">Chip Datasheet</a>
  *
  * **Additional Information and Add-ons**
@@ -1375,7 +1343,7 @@
  * @li <a href="http://www.homeautomationforgeeks.com/rf24software.shtml">Home Automation for Geeks</a>
  * @li <a href="https://maniacbug.wordpress.com/2012/03/30/rf24network/"> Original Maniacbug RF24Network Blog Post</a>
  * @li <a href="https://github.com/maniacbug/RF24"> ManiacBug on GitHub (Original Library Author)</a>
- * 
+ *
  *
  * <br>
  *
@@ -1405,25 +1373,25 @@
  *
  * @li [0] https://learn.sparkfun.com/tutorials/tiny-avr-programmer-hookup-guide/attiny85-use-hints
  * @li [1] http://highlowtech.org/?p=1695
- * @li [2] http://littlewire.cc/   
+ * @li [2] http://littlewire.cc/
  * <br><br><br>
  *
  *
  *
  *
  * @page Arduino Arduino
- * 
+ *
  * RF24 is fully compatible with Arduino boards <br>
  * See <b> http://www.arduino.cc/en/Reference/Board </b> and <b> http://arduino.cc/en/Reference/SPI </b> for more information
- * 
+ *
  * RF24 makes use of the standard hardware SPI pins (MISO,MOSI,SCK) and requires two additional pins, to control
  * the chip-select and chip-enable functions.<br>
- * These pins must be chosen and designated by the user, in RF24 radio(ce_pin,cs_pin); and can use any 
+ * These pins must be chosen and designated by the user, in RF24 radio(ce_pin,cs_pin); and can use any
  * available pins.
- * 
+ *
  * <br>
  * @section ARD_DUE Arduino Due
- * 
+ *
  * RF24 makes use of the extended SPI functionality available on the Arduino Due, and requires one of the
  * defined hardware SS/CS pins to be designated in RF24 radio(ce_pin,cs_pin);<br>
  * See http://arduino.cc/en/Reference/DueExtendedSPI for more information
@@ -1434,7 +1402,7 @@
  * @section Alternate_SPI Alternate SPI Support
  *
  * RF24 supports alternate SPI methods, in case the standard hardware SPI pins are otherwise unavailable.
- * 
+ *
  * <br>
  * **Software Driven SPI**
  *
@@ -1454,11 +1422,11 @@
  * <br>
  * **Alternate Hardware (UART) Driven  SPI**
  *
- * The Serial Port (UART) on Arduino can also function in SPI mode, and can double-buffer data, while the 
+ * The Serial Port (UART) on Arduino can also function in SPI mode, and can double-buffer data, while the
  * default SPI hardware cannot.
  *
  * The SPI_UART library is available at https://github.com/TMRh20/Sketches/tree/master/SPI_UART
- * 
+ *
  * Enabling:
  * 1. Install the SPI_UART library
  * 2. Edit RF24_config.h and uncomment #define SPI_UART
@@ -1476,12 +1444,12 @@
  *
  * @note SPI_UART on Mega boards requires soldering to an unused pin on the chip. <br>See
  * https://github.com/TMRh20/RF24/issues/24 for more information on SPI_UART.
- * 
+ *
  * @page ATTiny ATTiny
  *
  * ATTiny support is built into the library, so users are not required to include SPI.h in their sketches<br>
  * See the included rf24ping85 example for pin info and usage
- * 
+ *
  * Some versions of Arduino IDE may require a patch to allow use of the full program space on ATTiny<br>
  * See https://github.com/TCWORLD/ATTinyCore/tree/master/PCREL%20Patch%20for%20GCC for ATTiny patch
  *
@@ -1489,15 +1457,15 @@
  *
  * @section Hardware Hardware Configuration
  * By tong67 ( https://github.com/tong67 )
- * 
+ *
  *    **ATtiny25/45/85 Pin map with CE_PIN 3 and CSN_PIN 4**
  * @code
  *                                 +-\/-+
  *                   NC      PB5  1|o   |8  Vcc --- nRF24L01  VCC, pin2 --- LED --- 5V
  *    nRF24L01  CE, pin3 --- PB3  2|    |7  PB2 --- nRF24L01  SCK, pin5
  *    nRF24L01 CSN, pin4 --- PB4  3|    |6  PB1 --- nRF24L01 MOSI, pin7
- *    nRF24L01 GND, pin1 --- GND  4|    |5  PB0 --- nRF24L01 MISO, pin6 
- *                                 +----+ 
+ *    nRF24L01 GND, pin1 --- GND  4|    |5  PB0 --- nRF24L01 MISO, pin6
+ *                                 +----+
  * @endcode
  *
  * <br>
@@ -1508,22 +1476,22 @@
  *    This configuration is enabled when CE_PIN and CSN_PIN are equal, e.g. both 3                      <br>
  *    Because CE is always high the power consumption is higher than for 5 pins solution                <br>
  * @code
- *                                                                                           ^^         
- *                                 +-\/-+           nRF24L01   CE, pin3 ------|              //         
- *                           PB5  1|o   |8  Vcc --- nRF24L01  VCC, pin2 ------x----------x--|<|-- 5V    
- *                   NC      PB3  2|    |7  PB2 --- nRF24L01  SCK, pin5 --|<|---x-[22k]--|  LED         
- *                   NC      PB4  3|    |6  PB1 --- nRF24L01 MOSI, pin6  1n4148 |                       
- *    nRF24L01 GND, pin1 -x- GND  4|    |5  PB0 --- nRF24L01 MISO, pin7         |                       
- *                        |        +----+                                       |                       
- *                        |-----------------------------------------------||----x-- nRF24L01 CSN, pin4  
- *                                                                      10nF                            
+ *                                                                                           ^^
+ *                                 +-\/-+           nRF24L01   CE, pin3 ------|              //
+ *                           PB5  1|o   |8  Vcc --- nRF24L01  VCC, pin2 ------x----------x--|<|-- 5V
+ *                   NC      PB3  2|    |7  PB2 --- nRF24L01  SCK, pin5 --|<|---x-[22k]--|  LED
+ *                   NC      PB4  3|    |6  PB1 --- nRF24L01 MOSI, pin6  1n4148 |
+ *    nRF24L01 GND, pin1 -x- GND  4|    |5  PB0 --- nRF24L01 MISO, pin7         |
+ *                        |        +----+                                       |
+ *                        |-----------------------------------------------||----x-- nRF24L01 CSN, pin4
+ *                                                                      10nF
  * @endcode
  *
  * <br>
  *    **ATtiny24/44/84 Pin map with CE_PIN 8 and CSN_PIN 7** <br>
  *  Schematic provided and successfully tested by Carmine Pastore (https://github.com/Carminepz) <br>
  * @code
- *                                  +-\/-+                                                              
+ *                                  +-\/-+
  *    nRF24L01  VCC, pin2 --- VCC  1|o   |14 GND --- nRF24L01  GND, pin1
  *                            PB0  2|    |13 AREF
  *                            PB1  3|    |12 PA1
@@ -1532,13 +1500,13 @@
  *                            PA7  6|    |9  PA4 --- nRF24L01  SCK, pin5
  *    nRF24L01 MOSI, pin7 --- PA6  7|    |8  PA5 --- nRF24L01 MISO, pin6
  *                                  +----+
- *  @endcode                     
- *  
+ *  @endcode
+ *
  * <br><br><br>
  *
  *
- * 
- * 
+ *
+ *
  *
  *
  * @page BBB BeagleBone Black
@@ -1549,10 +1517,10 @@
  *  Users may need to edit the RF24/utility/BBB/spi.cpp file to configure the spi device. (Defaults: "/dev/spidev1.0";  or  "/dev/spidev1.1"; )
  *
  * <br>
- * @section AutoInstall Automated Install 
+ * @section AutoInstall Automated Install
  *(**Designed & Tested on RPi** - Defaults to SPIDEV on BBB)
  *
- * 
+ *
  * 1. Download the install.sh file from http://tmrh20.github.io/RF24Installer/RPi/install.sh
  * @code wget http://tmrh20.github.io/RF24Installer/RPi/install.sh @endcode
  * 2. Make it executable:
@@ -1560,42 +1528,42 @@
  * 3. Run it and choose your options
  * @code ./install.sh @endcode
  * 4. Run an example from one of the libraries
- * @code 
- * cd rf24libs/RF24/examples_RPi  
+ * @code
+ * cd rf24libs/RF24/examples_RPi
  * @endcode
  * Edit the gettingstarted example, to set your pin configuration
  * @code nano gettingstarted.cpp
- * make  
- * sudo ./gettingstarted  
+ * make
+ * sudo ./gettingstarted
  * @endcode
  *
  * <br>
  * @section ManInstall Manual Install
- * 1. Make a directory to contain the RF24 and possibly RF24Network lib and enter it: 
+ * 1. Make a directory to contain the RF24 and possibly RF24Network lib and enter it:
  * @code
- *  mkdir ~/rf24libs 
+ *  mkdir ~/rf24libs
  *  cd ~/rf24libs
 *  @endcode
  * 2. Clone the RF24 repo:
  *    @code git clone https://github.com/tmrh20/RF24.git RF24 @endcode
  * 3. Change to the new RF24 directory
  *    @code cd RF24 @endcode
- * 4. Build the library, and run an example file: 
+ * 4. Build the library, and run an example file:
  * **Note:** See the <a href="http://iotdk.intel.com/docs/master/mraa/index.html">MRAA </a> documentation for more info on installing MRAA
  *    @code sudo make install  OR  sudo make install RF24_MRAA=1 @endcode
  * @code
- * cd examples_RPi  
+ * cd examples_RPi
  * @endcode
  * Edit the gettingstarted example, to set your pin configuration
- * @code nano gettingstarted.cpp 
- * make 
+ * @code nano gettingstarted.cpp
+ * make
  * sudo ./gettingstarted
  * @endcode
  *
  * <br><br>
- *   
+ *
  * @page MRAA MRAA
- *  
+ *
  * MRAA is a Low Level Skeleton Library for Communication on GNU/Linux platforms <br>
  * See http://iotdk.intel.com/docs/master/mraa/index.html for more information
  *
@@ -1605,34 +1573,34 @@
  * @section Setup Setup
  * 1. Install the MRAA lib
  * 2. As per your device, SPI may need to be enabled
- * 
- * @section MRAA_Install Install 
+ *
+ * @section MRAA_Install Install
  *
- * 1. Make a directory to contain the RF24 and possibly RF24Network lib and enter it: 
+ * 1. Make a directory to contain the RF24 and possibly RF24Network lib and enter it:
  * @code
- *  mkdir ~/rf24libs 
+ *  mkdir ~/rf24libs
  *  cd ~/rf24libs
 *  @endcode
  * 2. Clone the RF24 repo:
  *    @code git clone https://github.com/tmrh20/RF24.git RF24 @endcode
  * 3. Change to the new RF24 directory
  *    @code cd RF24 @endcode
- * 4. Build the library: 
+ * 4. Build the library:
  *    @code sudo make install -B RF24_MRAA=1 @endcode
  * 5. Configure the correct pins in gettingstarted.cpp (See http://iotdk.intel.com/docs/master/mraa/index.html )
  *    @code
- *    cd examples_RPi  
- *    nano gettingstarted.cpp 
+ *    cd examples_RPi
+ *    nano gettingstarted.cpp
  *    @endcode
  * 6. Build an example
  *    @code
- *    make  
+ *    make
  *    sudo ./gettingstarted
  *    @endcode
  *
  * <br><br><br>
  *
- * 
+ *
  *
  *
  * @page RPi Raspberry Pi
@@ -1649,7 +1617,7 @@
  * B. Select **Advanced** and **enable the SPI kernel module** <br>
  * C. Update other software and libraries:
  * @code sudo apt-get update @endcode
- * @code sudo apt-get upgrade @endcode 
+ * @code sudo apt-get upgrade @endcode
  * <br>
  * @section AutoInstall Automated Install
  *
@@ -1660,26 +1628,26 @@
  * 3. Run it and choose your options
  * @code ./install.sh @endcode
  * 4. Run an example from one of the libraries
- * @code 
- * cd rf24libs/RF24/examples_RPi  
- * make  
- * sudo ./gettingstarted  
+ * @code
+ * cd rf24libs/RF24/examples_RPi
+ * make
+ * sudo ./gettingstarted
  * @endcode
  * <br><br>
  * @section ManInstall Manual Install
- * 1. Make a directory to contain the RF24 and possibly RF24Network lib and enter it: 
+ * 1. Make a directory to contain the RF24 and possibly RF24Network lib and enter it:
  * @code
- *  mkdir ~/rf24libs 
+ *  mkdir ~/rf24libs
  *  cd ~/rf24libs
 *  @endcode
  * 2. Clone the RF24 repo:
  *    @code git clone https://github.com/tmrh20/RF24.git RF24 @endcode
  * 3. Change to the new RF24 directory
  *    @code cd RF24 @endcode
- * 4. Build the library, and run an example file: 
+ * 4. Build the library, and run an example file:
  * @code sudo make install
- * cd examples_RPi  
- * make  
+ * cd examples_RPi
+ * make
  * sudo ./gettingstarted
  * @endcode
  *
@@ -1731,7 +1699,7 @@
  *  RF24 radio(RPI_V2_GPIO_P1_15,BCM2835_SPI_CS0, BCM2835_SPI_SPEED_8MHZ);
  *   or
  *  RF24 radio(RPI_V2_GPIO_P1_15,BCM2835_SPI_CS1, BCM2835_SPI_SPEED_8MHZ);
- *  
+ *
  *  RPi B+:
  *  RF24 radio(RPI_BPLUS_GPIO_J8_15,RPI_BPLUS_GPIO_J8_24, BCM2835_SPI_SPEED_8MHZ);
  *  or
@@ -1759,7 +1727,7 @@
  *
  * See http://pi.gadgetoid.com/pinout
  *
- * **Pins:**  
+ * **Pins:**
  *
  * | PIN | NRF24L01 |    RPI     | RPi -P1 Connector |
  * |-----|----------|------------|-------------------|
@@ -1771,54 +1739,54 @@
  * |  6  |   MOSI   | rpi-mosi   |     (19)          |
  * |  7  |   MISO   | rpi-miso   |     (21)          |
  * |  8  |   IRQ    |    -       |       -           |
- *   
- *   
- *  
- *  
+ *
+ *
+ *
+ *
  * <br><br>
  ****************
- *   
+ *
  * Based on the arduino lib from J. Coliz <maniacbug@ymail.com>  <br>
- * the library was berryfied by Purinda Gunasekara <purinda@gmail.com> <br>  
+ * the library was berryfied by Purinda Gunasekara <purinda@gmail.com> <br>
  * then forked from github stanleyseow/RF24 to https://github.com/jscrane/RF24-rpi  <br>
  * Network lib also based on https://github.com/farconada/RF24Network
  *
- * 
+ *
+ *
  *
- * 
  * <br><br><br>
- * 
+ *
  *
- *  
+ *
  * @page Python Python Wrapper (by https://github.com/mz-fuzzy)
- * 
- * @section Install Installation:  
- * 
+ *
+ * @section Install Installation:
+ *
  * Install the boost libraries:  (Note: Only the python libraries should be needed, this is just for simplicity)
  *
  * @code sudo apt-get install libboost1.50-all @endcode
  *
- * Build the library:  
+ * Build the library:
  *
  * @code ./setup.py build   @endcode
  *
- * Install the library 
+ * Install the library
  *
  * @code sudo ./setup.py install  @endcode
  *
- * 
+ *
  * See the additional <a href="pages.html">Platform Support</a> pages for information on connecting your hardware  <br>
- * See the included <a href="pingpair_dyn_8py-example.html">example </a> for usage information.   
- * 
- * Running the Example:  
- * 
- * Edit the pingpair_dyn.py example to configure the appropriate pins per the above documentation:  
+ * See the included <a href="pingpair_dyn_8py-example.html">example </a> for usage information.
+ *
+ * Running the Example:
+ *
+ * Edit the pingpair_dyn.py example to configure the appropriate pins per the above documentation:
  *
  * @code nano pingpair_dyn.py   @endcode
  *
- * Configure another device, Arduino or RPi with the <a href="pingpair_dyn_8py-example.html">pingpair_dyn</a> example  
+ * Configure another device, Arduino or RPi with the <a href="pingpair_dyn_8py-example.html">pingpair_dyn</a> example
  *
- * Run the example  
+ * Run the example
  *
  * @code sudo ./pingpair_dyn.py  @endcode
  *
@@ -1828,9 +1796,9 @@
  * @page Portability RF24 Portability
  *
  * The RF24 radio driver mainly utilizes the <a href="http://arduino.cc/en/reference/homePage">Arduino API</a> for GPIO, SPI, and timing functions, which are easily replicated
- * on various platforms. <br>Support files for these platforms are stored under RF24/utility, and can be modified to provide 
+ * on various platforms. <br>Support files for these platforms are stored under RF24/utility, and can be modified to provide
  * the required functionality.
- * 
+ *
  * <br>
  * @section Hardware_Templates Basic Hardware Template
  *
@@ -1839,18 +1807,18 @@
  * The RF24 library now includes a basic hardware template to assist in porting to various platforms. <br> The following files can be included
  * to replicate standard Arduino functions as needed, allowing devices from ATTiny to Raspberry Pi to utilize the same core RF24 driver.
  *
- * | File               |                   Purpose                                                    | 
- * |--------------------|------------------------------------------------------------------------------| 
- * | RF24_arch_config.h | Basic Arduino/AVR compatibility, includes for remaining support files, etc   | 
- * | includes.h         | Linux only. Defines specific platform, include correct RF24_arch_config file | 
- * | spi.h              | Provides standardized SPI ( transfer() ) methods                         | 
- * | gpio.h             | Provides standardized GPIO ( digitalWrite() ) methods                        | 
- * | compatibility.h    | Provides standardized timing (millis(), delay()) methods                     | 
- * | your_custom_file.h | Provides access to custom drivers for spi,gpio, etc                          | 
+ * | File               |                   Purpose                                                    |
+ * |--------------------|------------------------------------------------------------------------------|
+ * | RF24_arch_config.h | Basic Arduino/AVR compatibility, includes for remaining support files, etc   |
+ * | includes.h         | Linux only. Defines specific platform, include correct RF24_arch_config file |
+ * | spi.h              | Provides standardized SPI ( transfer() ) methods                         |
+ * | gpio.h             | Provides standardized GPIO ( digitalWrite() ) methods                        |
+ * | compatibility.h    | Provides standardized timing (millis(), delay()) methods                     |
+ * | your_custom_file.h | Provides access to custom drivers for spi,gpio, etc                          |
  *
  * <br>
  * Examples are provided via the included hardware support templates in **RF24/utility** <br>
- * See the <a href="modules.html">modules</a> page for examples of class declarations 
+ * See the <a href="modules.html">modules</a> page for examples of class declarations
  *
  *<br>
  * @section Device_Detection Device Detection
@@ -1862,7 +1830,7 @@
  * <br>
  * @section Ported_Code Code
  * To have your ported code included in this library, or for assistance in porting, create a pull request or open an issue at https://github.com/TMRh20/RF24
- * 
+ *
  *
  *<br><br><br>
  */