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           PinName TRIG);
00018           
00019     
00020           
00021     /* Reads a packet of data. Returns false if read failed. Use available() to check how much space to allocate for buffer */
00022     bool read(unsigned char* data, unsigned int size);
00023 
00024     /* Reads a byte of data from the receive buffer 
00025         Returns 0xFF if there is no data */
00026     unsigned char read();
00027 
00028     /* Transmits a packet of data */
00029     void write(unsigned char* data, unsigned char length);
00030     void write(unsigned char data); /* 1-byte packet */
00031     void write(queue<char> &data, int length = -1); /* sends a whole queue */
00032     
00033     /* Returns the packet length if data is available in the receive buffer, 0 otherwise*/
00034     unsigned int available();
00035     
00036     /* RF code setting */
00037     void setCode(unsigned char code);
00038 
00039 protected:
00040     /* Receive FIFO buffer */
00041     queue<unsigned char> fifo;
00042     
00043     /* SPI module */
00044     SPI spi;
00045     
00046     /* Other digital pins */
00047     DigitalOut NCS;
00048     InterruptIn NIRQ;
00049     DigitalIn NIRQ_in;
00050     DigitalOut rfled;
00051     DigitalOut trigLED;
00052     DigitalOut TRIG;
00053     
00054     rfmode_t mode;
00055 
00056     /* Initialises the RF12B module */
00057     void init();
00058 
00059     /* Write a command to the RF Module */
00060     unsigned int writeCmd(unsigned int cmd);
00061     
00062     /* Sends a byte of data across RF */
00063     void send(unsigned char data);
00064     
00065     /* Switch module between receive and transmit modes */
00066     void changeMode(rfmode_t mode);
00067     
00068     /* Interrupt routine for data reception */
00069     void rxISR();
00070     
00071     /* Tell the RF Module this packet is received and wait for the next */
00072     void resetRX();
00073     
00074     /* Return the RF Module Status word */
00075     unsigned int status();
00076     
00077     /* Calculate CRC8 */
00078     unsigned char crc8(unsigned char crc, unsigned char data);
00079     
00080 
00081     unsigned char rfCode;
00082 };
00083 
00084 #endif /* _RF12B_H */