iforce2d Chris
Basic port of the gcopeland nRF24L01 library
Diff: RF24.h
- Revision:
- 2:75a5b58b2338
diff -r 5be2682710c6 -r 75a5b58b2338 RF24.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/RF24.h Mon Mar 25 07:35:02 2019 +0000
@@ -0,0 +1,829 @@
+/*
+ Copyright (C) 2011 J. Coliz <maniacbug@ymail.com>
+
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License
+ version 2 as published by the Free Software Foundation.
+ */
+
+/**
+ * @file RF24.h
+ *
+ * Class declaration for RF24 and helper enums
+ */
+
+#ifndef __RF24_H__
+#define __RF24_H__
+
+#include "mbed.h"
+#include <RF24_config.h>
+
+/**
+ * Power Amplifier level.
+ *
+ * For use with setPALevel()
+ */
+typedef enum { RF24_PA_MIN = 0,RF24_PA_LOW, RF24_PA_HIGH, RF24_PA_MAX, RF24_PA_ERROR } rf24_pa_dbm_e ;
+
+/**
+ * Data rate. How fast data moves through the air.
+ *
+ * For use with setDataRate()
+ */
+typedef enum { RF24_1MBPS = 0, RF24_2MBPS, RF24_250KBPS } rf24_datarate_e;
+
+/**
+ * CRC Length. How big (if any) of a CRC is included.
+ *
+ * For use with setCRCLength()
+ */
+typedef enum { RF24_CRC_DISABLED = 0, RF24_CRC_8, RF24_CRC_16 } rf24_crclength_e;
+
+/**
+ * Driver for nRF24L01(+) 2.4GHz Wireless Transceiver
+ */
+
+class RF24
+{
+private:
+ uint8_t ce_pin; /**< "Chip Enable" pin, activates the RX or TX role */
+ uint8_t csn_pin; /**< SPI Chip select */
+ bool wide_band; /* 2Mbs data rate in use? */
+ bool p_variant; /* False for RF24L01 and true for RF24L01P */
+ uint8_t payload_size; /**< Fixed size of payloads */
+ bool ack_payload_available; /**< Whether there is an ack payload waiting */
+ bool dynamic_payloads_enabled; /**< Whether dynamic payloads are enabled. */
+ uint8_t ack_payload_length; /**< Dynamic size of pending ack payload. */
+ uint64_t pipe0_reading_address; /**< Last address set on pipe 0 for reading. */
+
+ DigitalOut do_csn;
+ DigitalOut do_ce;
+ SPI spi;
+ Timer timer;
+
+protected:
+ /**
+ * @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(int 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(int 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 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 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);
+
+ /**
+ * 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 transmit buffer
+ *
+ * @return Current value of status register
+ */
+ uint8_t flush_tx(void);
+
+ /**
+ * Retrieve the current status of the chip
+ *
+ * @return Current value of status register
+ */
+ uint8_t get_status(void);
+
+ /**
+ * 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(Serial& serial, 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(Serial& serial, 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(Serial& serial, 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(Serial& serial, const char* name, uint8_t reg, uint8_t qty = 1);
+
+ /**
+ * 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);
+ /**@}*/
+
+public:
+ /**
+ * @name Primary public interface
+ *
+ * These are the main methods you need to operate the chip
+ */
+ /**@{*/
+
+ /**
+ * Constructor
+ *
+ * Creates a new instance of this driver. Before using, you create an instance
+ * and send in the unique pins that this chip is connected to.
+ *
+ * @param _cepin The pin attached to Chip Enable on the RF module
+ * @param _cspin The pin attached to Chip Select
+ */
+ RF24(PinName mosi,
+ PinName miso,
+ PinName sck,
+ PinName csn,
+ PinName ce);
+
+ /**
+ * Begin operation of the chip
+ *
+ * Call this in setup(), before calling any other methods.
+ */
+ void begin(void);
+
+ /**
+ * Start listening on the pipes opened for reading.
+ *
+ * Be sure to call openReadingPipe() first. Do not call write() while
+ * in this mode, without first calling stopListening(). Call
+ * isAvailable() to check for incoming traffic, and read() to get it.
+ */
+ void startListening(void);
+
+ /**
+ * Stop listening for incoming messages
+ *
+ * Do this before calling write().
+ */
+ void stopListening(void);
+
+ /**
+ * Write to the open writing pipe
+ *
+ * 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 60ms.
+ *
+ * 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.
+ *
+ * @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 write( const void* buf, uint8_t len );
+
+ /**
+ * Test whether there are bytes available to be read
+ *
+ * @return True if there is a payload available, false if none is
+ */
+ bool available(void);
+
+ /**
+ * Read the payload
+ *
+ * Return the last payload received
+ *
+ * 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.
+ *
+ * @param buf Pointer to a buffer where the data should be written
+ * @param len Maximum number of bytes to read into the buffer
+ * @return True if the payload was delivered successfully false if not
+ */
+ bool read( void* buf, uint8_t len );
+
+ /**
+ * Open a pipe for writing
+ *
+ * Only one pipe can be open at once, but you can change the pipe
+ * you'll listen to. Do not call this while actively listening.
+ * Remember to stopListening() first.
+ *
+ * Addresses are 40-bit hex values, e.g.:
+ *
+ * @code
+ * openWritingPipe(0xF0F0F0F0F0);
+ * @endcode
+ *
+ * @param address The 40-bit address of the pipe to open. This can be
+ * any value whatsoever, as long as you are the only one writing to it
+ * and only one other radio is listening to it. Coordinate these pipe
+ * addresses amongst nodes on the network.
+ */
+ void openWritingPipe(uint64_t address);
+
+ /**
+ * Open a pipe for reading
+ *
+ * Up to 6 pipes can be open for reading at once. Open all the
+ * reading pipes, and then call startListening().
+ *
+ * @see openWritingPipe
+ *
+ * @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().
+ *
+ * @todo Enforce the restriction that pipes 1-5 must share the top 32 bits
+ *
+ * @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);
+
+ /**@}*/
+ /**
+ * @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 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 Static Payload Size
+ *
+ * @see setPayloadSize()
+ *
+ * @return The number of bytes in the payload
+ */
+ uint8_t getPayloadSize(void);
+
+ /**
+ * Get Dynamic Payload Size
+ *
+ * For dynamic payloads, this pulls the size of the payload off
+ * the chip
+ *
+ * @return Payload length of last-received dynamic payload
+ */
+ uint8_t getDynamicPayloadSize(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.
+ *
+ * @see examples/pingpair_pl/pingpair_pl.pde
+ */
+ 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.
+ *
+ * @see examples/pingpair_pl/pingpair_dyn.pde
+ */
+ void enableDynamicPayloads(void);
+
+ /**
+ * 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
+ *
+ * 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.
+ * Relative mnemonics have been used to allow for future PA level
+ * changes. According to 6.5 of the nRF24L01+ specification sheet,
+ * they translate to: RF24_PA_MIN=-18dBm, RF24_PA_LOW=-12dBm,
+ * RF24_PA_MED=-6dBM, and RF24_PA_HIGH=0dBm.
+ *
+ * @param level Desired PA level.
+ */
+ void setPALevel( rf24_pa_dbm_e level ) ;
+
+ /**
+ * Fetches the current PA level.
+ *
+ * @return Returns a value from the rf24_pa_dbm_e enum describing
+ * the current PA setting. Please remember, all values represented
+ * by the enum mnemonics are negative dBm. See setPALevel for
+ * return value descriptions.
+ */
+ rf24_pa_dbm_e 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);
+
+ /**
+ * 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);
+
+ /**
+ * 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
+ *
+ */
+ void disableCRC( void ) ;
+
+ /**@}*/
+ /**
+ * @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
+ */
+ void printDetails(Serial& serial);
+
+ /**
+ * Enter low-power mode
+ *
+ * To return to normal power mode, either write() some data or
+ * startListening, or powerUp().
+ */
+ void powerDown(void);
+
+ /**
+ * Leave low-power mode - making radio more responsive
+ *
+ * To return to low power mode, call powerDown().
+ */
+ void powerUp(void) ;
+
+ /**
+ * Test whether there are bytes available to be read
+ *
+ * Use this version to discover on which pipe the message
+ * arrived.
+ *
+ * @param[out] pipe_num Which pipe has the payload available
+ * @return True if there is a payload available, false if none is
+ */
+ bool available(uint8_t* pipe_num);
+
+ /**
+ * 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 whatHappened()
+ *
+ * @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
+ */
+ void startWrite( 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.
+ *
+ * @warning According to the data sheet, only three of these can be pending
+ * at any time. I have not tested this.
+ *
+ * @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().
+ *
+ * Call read() to retrieve the ack payload.
+ *
+ * @warning Calling this function clears the internal flag which indicates
+ * a payload is available. If it returns true, you must read the packet
+ * out as the very next interaction with the radio, or the results are
+ * undefined.
+ *
+ * @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);
+
+ /**
+ * 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.
+ *
+ * @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; }
+
+ /**@}*/
+};
+
+/**
+ * @example GettingStarted.pde
+ *
+ * This is an example which corresponds to my "Getting Started" blog post:
+ * <a style="text-align:center" href="http://maniacbug.wordpress.com/2011/11/02/getting-started-rf24/">Getting Started with nRF24L01+ on Arduino</a>.
+ *
+ * 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
+ * with the serial monitor and 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.
+ */
+
+/**
+ * @example nordic_fob.pde
+ *
+ * This is an example of how to use the RF24 class to receive signals from the
+ * Sparkfun Nordic FOB. See http://www.sparkfun.com/products/8602 .
+ * Thanks to Kirk Mower for providing test hardware.
+ */
+
+/**
+ * @example led_remote.pde
+ *
+ * This is an example of how to use the RF24 class to control a remote
+ * bank of LED's using buttons on a remote control.
+ *
+ * Every time the buttons change on the remote, the entire state of
+ * buttons is send to the led board, which displays the state.
+ */
+
+/**
+ * @example pingpair.pde
+ *
+ * This is an example of how to use the RF24 class. Write this sketch to two
+ * different nodes, connect the role_pin to ground on one. 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.
+ */
+
+/**
+ * @example pingpair_maple.pde
+ *
+ * This is an example of how to use the RF24 class on the Maple. For a more
+ * detailed explanation, see my blog post:
+ * <a href="http://maniacbug.wordpress.com/2011/12/14/nrf24l01-running-on-maple-3/">nRF24L01+ Running on Maple</a>
+ *
+ * It will communicate well to an Arduino-based unit as well, so it's not for only Maple-to-Maple communication.
+ *
+ * Write this sketch to two different nodes,
+ * connect the role_pin to ground on one. 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.
+ */
+
+/**
+ * @example starping.pde
+ *
+ * This sketch is a more complex example of using the RF24 library for Arduino.
+ * Deploy this on up to six nodes. Set one as the 'pong receiver' by tying the
+ * role_pin low, and the others will be 'ping transmit' units. The ping units
+ * unit will send out the value of millis() once a second. The pong unit will
+ * respond back with a copy of the value. Each ping unit can get that response
+ * back, and determine how long the whole cycle took.
+ *
+ * This example requires a bit more complexity to determine which unit is which.
+ * The pong receiver is identified by having its role_pin tied to ground.
+ * The ping senders are further differentiated by a byte in eeprom.
+ */
+
+/**
+ * @example pingpair_pl.pde
+ *
+ * This is an example of how to do two-way communication without changing
+ * transmit/receive modes. Here, a payload is set to the transmitter within
+ * the Ack packet of each transmission. Note that the payload is set BEFORE
+ * the sender's message arrives.
+ */
+
+/**
+ * @example pingpair_irq.pde
+ *
+ * This is an example of how to user interrupts to interact with the radio.
+ * It builds on the pingpair_pl example, and uses ack payloads.
+ */
+
+/**
+ * @example pingpair_sleepy.pde
+ *
+ * This is an example of how to use the RF24 class to create a battery-
+ * efficient system. It is just like the pingpair.pde example, but the
+ * ping node powers down the radio and sleeps the MCU after every
+ * ping/pong cycle.
+ */
+
+/**
+ * @example scanner.pde
+ *
+ * Example to detect interference on the various channels available.
+ * This is a good diagnostic tool to check whether you're picking a
+ * good channel for your application.
+ *
+ * Inspired by cpixip.
+ * See http://arduino.cc/forum/index.php/topic,54795.0.html
+ */
+
+/**
+ * @mainpage Driver for nRF24L01(+) 2.4GHz Wireless Transceiver
+ *
+ * @section Goals Design Goals
+ *
+ * This library is designed to be...
+ * @li Maximally compliant with the intended operation of the chip
+ * @li Easy for beginners to use
+ * @li Consumed with a public interface that's similiar to other Arduino standard libraries
+ *
+ * @section News News
+ *
+ * NOW COMPATIBLE WITH ARDUINO 1.0 - The 'master' branch and all examples work with both Arduino 1.0 and earlier versions.
+ * Please <a href="https://github.com/maniacbug/RF24/issues/new">open an issue</a> if you find any problems using it with any version of Arduino.
+ *
+ * NOW COMPATIBLE WITH MAPLE - RF24 has been tested with the
+ * <a href="http://leaflabs.com/store/#Maple-Native">Maple Native</a>,
+ * and should work with any Maple board. See the pingpair_maple example.
+ * Note that only the pingpair_maple example has been tested on Maple, although
+ * the others can certainly be adapted.
+ *
+ * @section Useful Useful References
+ *
+ * Please refer to:
+ *
+ * @li <a href="http://maniacbug.github.com/RF24/">Documentation Main Page</a>
+ * @li <a href="http://maniacbug.github.com/RF24/classRF24.html">RF24 Class Documentation</a>
+ * @li <a href="https://github.com/maniacbug/RF24/">Source Code</a>
+ * @li <a href="https://github.com/maniacbug/RF24/archives/master">Downloads Page</a>
+ * @li <a href="http://www.nordicsemi.com/files/Product/data_sheet/nRF24L01_Product_Specification_v2_0.pdf">Chip Datasheet</a>
+ *
+ * This chip uses the SPI bus, plus two chip control pins. Remember that pin 10 must still remain an output, or
+ * the SPI hardware will go into 'slave' mode.
+ *
+ * @section More More Information
+ *
+ * @subpage FAQ
+ *
+ * @section Projects Projects
+ *
+ * Stuff I have built with RF24
+ *
+ * <img src="http://farm7.staticflickr.com/6044/6307669179_a8d19298a6_m.jpg" width="240" height="160" alt="RF24 Getting Started - Finished Product">
+ *
+ * <a style="text-align:center" href="http://maniacbug.wordpress.com/2011/11/02/getting-started-rf24/">Getting Started with nRF24L01+ on Arduino</a>
+ *
+ * <img src="http://farm8.staticflickr.com/7159/6645514331_38eb2bdeaa_m.jpg" width="240" height="160" alt="Nordic FOB and nRF24L01+">
+ *
+ * <a style="text-align:center" href="http://maniacbug.wordpress.com/2012/01/08/nordic-fob/">Using the Sparkfun Nordic FOB</a>
+ *
+ * <img src="http://farm7.staticflickr.com/6097/6224308836_b9b3b421a3_m.jpg" width="240" height="160" alt="RF Duinode V3 (2V4)">
+ *
+ * <a href="http://maniacbug.wordpress.com/2011/10/19/sensor-node/">Low-Power Wireless Sensor Node</a>
+ *
+ * <img src="http://farm8.staticflickr.com/7012/6489477865_b56edb629b_m.jpg" width="240" height="161" alt="nRF24L01+ connected to Leaf Labs Maple Native">
+ *
+ * <a href="http://maniacbug.wordpress.com/2011/12/14/nrf24l01-running-on-maple-3/">nRF24L01+ Running on Maple</a>
+ */
+
+#endif // __RF24_H__
+// vim:ai:cin:sts=2 sw=2 ft=cpp
+