Diff: MRF24J40/MRF24J40.h

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+/* mbed MRF24J40 (IEEE 802.15.4 tranceiver) Library
+ * Copyright (c) 2011 Jeroen Hilgers
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+  
+#ifndef MRF24J40_H
+#define MRF25J40_H
+
+#include "mbed.h"
+
+/** MRF24J40 class. Provides a simple send/receive API for a microchip
+ ** MFR24J40 IEEE 802.15.4 tranceiver. The tranceiver is available on a 
+ ** module that can easilly be soldered to some header pins to use it with
+ ** an mbed on a breadboard. The module is called 'MRF24J40MA' and can be 
+ ** ordered for example by www.farnell.com.
+ *
+ * Example:
+ * @code
+ * #include "mbed.h"
+ * #include "MRF24J40.h"
+ * 
+ * // RF tranceiver to link with handheld.
+ * MRF24J40 mrf(p11, p12, p13, p14, p21);
+ * 
+ * // LEDs
+ * DigitalOut led1(LED1);
+ * DigitalOut led2(LED2);
+ * DigitalOut led3(LED3);
+ * DigitalOut led4(LED4);
+ * 
+ * // Timer.
+ * Timer timer;
+ * 
+ * // Serial port for showing RX data.
+ * Serial pc(USBTX, USBRX); 
+ * 
+ * // Send / receive buffers.
+ * // IMPORTANT: The MRF24J40 is intended as zigbee tranceiver; it tends
+ * // to reject data that doesn't have the right header. So the first 
+ * // 8 bytes in txBuffer look like a valid header. The remaining 120
+ * // bytes can be used for anything you like.
+ * uint8_t txBuffer[128]= {1, 8, 0, 0xA1, 0xB2, 0xC3, 0xD4, 0x00};
+ * 
+ * uint8_t rxBuffer[128];
+ * uint8_t rxLen;
+ * 
+ * int main (void)
+ * {
+ *     uint8_t count = 0;
+ *     pc.baud(115200);
+ *     timer.start();
+ *     while(1)
+ *     {
+ *         // Check if any data was received. 
+ *         rxLen = mrf.Receive(rxBuffer, 128);
+ *         if(rxLen) 
+ *         {
+ *             // Toggle LED 1 upon each reception of data.
+ *             led1 = led1^1;
+ *             // Send to serial.
+ *             // IMPORTANT: The last two bytes of the received data
+ *             // are the checksum used in the transmission. 
+ *             for(uint8_t i=0; i<rxLen; i++)
+ *             {
+ *                 pc.printf("0x%02X ", rxBuffer[i]);
+ *             }
+ *             pc.printf("\r\n");
+ *         }
+ *         
+ *         // Each second, send some data.
+ *         if(timer.read_ms() >= 1000) 
+ *         {
+ *             timer.reset();
+ *             // Toggle LED 2.
+ *             led2 = led2^1;
+ *             
+ *             // UART.
+ *             pc.printf("TXD\r\n");
+ *             
+ *             // Send counter value.
+ *             count++;
+ *             txBuffer[8] = count;
+ *             mrf.Send(txBuffer, 9);
+ *         }
+ *     }
+ * }
+ * @endcode
+ */
+
+
+class MRF24J40
+{
+  public:
+    /** Create a MRF24J40 object and initizalize it.
+     *
+     * @param pin mosi Spi MOSI pin connected to MRF's SDI.
+     * @param pin miso Spi MISO pin connected to MRF's SDO.
+     * @param pin sck  Spi SCK pin connected to MRF's SCK.
+     * @param pin cs Pin connected to MRF's #CS.
+     * @param pin reset Pin connected to MRF's #Reset.
+     */
+    MRF24J40(PinName mosi, PinName miso, PinName sck, PinName cs, PinName reset);//, PinName irq, PinName wake);
+    
+    /** Reset the MRF24J40 and initialize it.
+     */
+    void Reset(void);                             // Reset chip and configure it.
+    
+    /** Send data.
+     *
+     * Note that the MRF24J40 only handles data with a valid IEEE 802.15.4
+     * header. See the example how to get around this.
+     *
+     * @param data Pointer to data to be send.
+     * @param length Length of the data to be send in bytes.
+     */
+    void Send(uint8_t *data, uint8_t length);         // Send data.
+
+    /** Check if any data was received.
+     *
+     * Note that the MRF24J40 appends two bytes of CRC for each packet.
+     * So you will receive two bytes more than were send with the 'Send' function.
+     *
+     * @param data Pointer to buffer where received data can be placed.
+     * @param maxLength Maximum amount of data to be placed in the buffer.
+     * @param returns The number of bytes written into the buffer.
+     */
+    uint8_t Receive(uint8_t *data, uint8_t maxLength);  // Receive data if ready.
+    
+     /** Sets the channel of the MRF24J40
+     *
+     * @param channel A number between 0-15 (0=2405MHz 15=2480MHz) 
+     */
+    void SetChannel(uint8_t channel);
+    
+    // void DebugDump(Serial &ser);
+
+  private:
+    SPI mSpi;
+    DigitalOut mCs;
+    DigitalOut mReset;
+    // DigitalIn mIrq;
+    // DigitalIn mWake;
+
+    uint8_t ReadShort (uint8_t address);
+    void WriteShort (uint8_t address, uint8_t data);
+    uint8_t ReadLong (uint16_t address);
+    void WriteLong (uint16_t address, uint8_t data);
+};
+
+#endif
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