RF12B.h

00001 #ifndef _RF12B_H
00002 #define _RF12B_H
00003 
00004 #include "mbed.h"
00005 #include <queue>
00006 
00007 enum rfmode_t{RX, TX};
00008 
00009 class RF12B {
00010 public:
00011     /* Constructor */
00012     RF12B(PinName SDI,
00013           PinName SDO,
00014           PinName SCK,
00015           PinName NCS,
00016           PinName NIRQ);
00017           
00018     
00019           
00020     /* Reads a packet of data. Returns false if read failed. Use available() to check how much space to allocate for buffer */
00021     bool read(unsigned char* data, unsigned int size);
00022 
00023     /* Reads a byte of data from the receive buffer 
00024         Returns 0xFF if there is no data */
00025     unsigned char read();
00026 
00027     /* Transmits a packet of data */
00028     void write(unsigned char* data, unsigned char length);
00029     void write(unsigned char data); /* 1-byte packet */
00030     void write(queue<char> &data, int length = -1); /* sends a whole queue */
00031     
00032     /* Returns the packet length if data is available in the receive buffer, 0 otherwise*/
00033     unsigned int available();
00034 
00035 protected:
00036     /* Receive FIFO buffer */
00037     queue<unsigned char> fifo;
00038     
00039     /* SPI module */
00040     SPI spi;
00041     
00042     /* Other digital pins */
00043     DigitalOut NCS;
00044     InterruptIn NIRQ;
00045     DigitalIn NIRQ_in;
00046     DigitalOut rfled;
00047     
00048     rfmode_t mode;
00049 
00050     /* Initialises the RF12B module */
00051     void init();
00052 
00053     /* Write a command to the RF Module */
00054     unsigned int writeCmd(unsigned int cmd);
00055     
00056     /* Sends a byte of data across RF */
00057     void send(unsigned char data);
00058     
00059     /* Switch module between receive and transmit modes */
00060     void changeMode(rfmode_t mode);
00061     
00062     /* Interrupt routine for data reception */
00063     void rxISR();
00064     
00065     /* Tell the RF Module this packet is received and wait for the next */
00066     void resetRX();
00067     
00068     /* Return the RF Module Status word */
00069     unsigned int status();
00070     
00071     /* Calculate CRC8 */
00072     unsigned char crc8(unsigned char crc, unsigned char data);
00073 };
00074 
00075 #endif /* _RF12B_H */