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 DummyCT;
00010 
00011 class RF12B {
00012 public:
00013     /* Constructor */
00014     RF12B(PinName SDI,
00015           PinName SDO,
00016           PinName SCK,
00017           PinName NCS,
00018           PinName NIRQ);
00019      
00020           
00021           
00022     /* Reads a packet of data. Returns false if read failed. Use available() to check how much space to allocate for buffer */
00023     bool read(unsigned char* data, unsigned int size);
00024 
00025     /* Reads a byte of data from the receive buffer 
00026         Returns 0xFF if there is no data */
00027     unsigned char read();
00028 
00029     /* Transmits a packet of data */
00030     void write(unsigned char* data, unsigned char length);
00031     void write(unsigned char data); /* 1-byte packet */
00032 //    void write(std::queue<char> &data, int length = -1); /* sends a whole queue */
00033     
00034     /* Returns the packet length if data is available in the receive buffer, 0 otherwise*/
00035     unsigned int available();
00036     
00037     /** A assigns a callback function when a new reading is available **/
00038     void (*callbackfunc)(unsigned char rx_code);
00039     DummyCT* callbackobj;
00040     void (DummyCT::*mcallbackfunc)(unsigned char rx_code);    
00041 
00042 protected:
00043     /* Receive FIFO buffer */
00044 //    std::queue<unsigned char> fifo;
00045 //    std::queue<unsigned char> temp; //for storing stuff mid-packet
00046     
00047     /* SPI module */
00048     SPI spi;
00049     
00050     /* Other digital pins */
00051     DigitalOut NCS;
00052     InterruptIn NIRQ;
00053     DigitalIn NIRQ_in;
00054     //DigitalOut rfled;
00055     
00056     rfmode_t mode;
00057 
00058     /* Initialises the RF12B module */
00059     void init();
00060 
00061     /* Write a command to the RF Module */
00062     unsigned int writeCmd(unsigned int cmd);
00063     
00064     /* Sends a byte of data across RF */
00065     void send(unsigned char data);
00066     
00067     /* Switch module between receive and transmit modes */
00068     void changeMode(rfmode_t mode);
00069     
00070     /* Interrupt routine for data reception */
00071     void rxISR();
00072     
00073     /* Tell the RF Module this packet is received and wait for the next */
00074     void resetRX();
00075     
00076     /* Return the RF Module Status word */
00077     unsigned int status();
00078     
00079     /* Calculate CRC8 */
00080     unsigned char crc8(unsigned char crc, unsigned char data);
00081 };
00082 
00083 #endif /* _RF12B_H */