File content as of revision 0:e724d8251cdc:

/* RF12B Library. Based on work done by JeeLabs.org ported to mbed by SK Pang.
http://jeelabs.net/projects/cafe/wiki/RF12

http://opensource.org/licenses/mit-license.php

Jan 2012 skpang.co.uk

Modified by Andrew Lindsay (andrew [at] thiseldo [dot] co [dot] uk)
 
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 _RF12B_H
#define _RF12B_H

#include "mbed.h"

#define RF12_433MHZ     1
#define RF12_868MHZ     2
#define RF12_915MHZ     3

#define rf12_grp        rf12_buf[0]
#define rf12_hdr        rf12_buf[1]
#define rf12_len        rf12_buf[2]
#define rf12_data       (rf12_buf + 3)

#define RF12_HDR_CTL    0x80
#define RF12_HDR_DST    0x40
#define RF12_HDR_ACK    0x20
#define RF12_HDR_MASK   0x1F

#define RF12_MAXDATA    66
// maximum transmit / receive buffer: 3 header + data + 2 crc bytes
#define RF_MAX   (RF12_MAXDATA + 5)
//#define PACKET_LEN 16

// shorthand to simplify sending out the proper ACK when requested
#define RF12_WANTS_ACK ((rf12_hdr & RF12_HDR_ACK) && !(rf12_hdr & RF12_HDR_CTL))
#define RF12_ACK_REPLY (rf12_hdr & RF12_HDR_DST ? RF12_HDR_CTL : \
            RF12_HDR_CTL | RF12_HDR_DST | (rf12_hdr & RF12_HDR_MASK))

/** RFM12B Radio module class
 * Example usage:
 * @code
 * #include "RF12B.h"
 * 
 * RF12B rfm12b(p11, p12, p13, p14, p18);
 *
 * int main() {
 *     rfm12b.init(2, 868, 5 );   //id = 2, band 866, group 5
 *     rfm12b.rf12_recvStart();
 *     while (true) {
 *         if ( rfm12b.available() > 0 ) {
 *             // Do something with received data
 *         }
 *     }
 *
 * }
 * @endcode
 */
class RF12B {
public:
    /* Constructor */
    RF12B(PinName SDI,
          PinName SDO,
          PinName SCK,
          PinName NCS,
          PinName NIRQ);

    /* Initialises the RF12B module */
    void init(uint8_t id, uint8_t band, uint8_t g);

    /* Returns the packet length if data is available in the receive buffer, 0 otherwise*/
    bool havePacket( void );
    int available();
    void rf12_sendStart (uint8_t hdr, const void* ptr, uint8_t len);
    void rf12_sendStart (uint8_t hdr);
    uint8_t  rf12_recvDone (void);
    void rf12_recvStart (void);
    uint16_t check_crc(void);
    uint8_t length(void);
    uint8_t* get_data(void);
    uint8_t* get_payload(void);

protected:

    /* SPI module */
    SPI spi;

    /* Other digital pins */
    DigitalOut NCS;
    InterruptIn NIRQ;
    DigitalIn NIRQ_in;
    volatile uint16_t rf12_crc; // running crc value
    volatile unsigned char rf12_buf[RF_MAX];  // recv/xmit buf, including hdr & crc bytes
    volatile  uint8_t nodeid;              // address of this node
    volatile  uint8_t group;               // network group
    volatile uint8_t rxfill;     // number of data bytes in rf12_buf
    volatile int8_t rxstate;     // current transceiver state

    /* Write a command to the RF Module */
    int writeCmd(int cmd);

    /* Sends a byte of data across RF */
    void send(uint8_t data);

    /* Interrupt routine for data reception */
    void rxISR();

    uint16_t _crc16_update(uint16_t crc, uint8_t data);

    uint16_t rf12_xfer (uint16_t cmd);
    uint8_t rf12_byte(uint8_t out);
};

#endif /* _RF12B_H */