Harry Eakins / RF12B

Library to send and receive data using RF12B transceiver modules Big thanks to the tutorial at https://loee.jottit.com/rfm12b_and_avr_-_quick_start and madcowswe

Dependents:   Measure_system Quadcopter_copy

RF12B.cpp@3:e72ad65868ab, 2011-03-10 (annotated)

Committer:
harryeakins
Date:
Thu Mar 10 13:14:48 2011 +0000
Revision:
3:e72ad65868ab
Parent:
2:99cf337cd23e
Child:
4:2a295db9ba1a
Updated write functions

Who changed what in which revision?

UserRevisionLine numberNew contents of line
harryeakins 3:e72ad65868ab 1 #include "RF12B.h"
harryeakins 3:e72ad65868ab 2
harryeakins 3:e72ad65868ab 3 RF12B::RF12B(PinName SDI,
harryeakins 3:e72ad65868ab 4 PinName SDO,
harryeakins 3:e72ad65868ab 5 PinName SCK,
harryeakins 3:e72ad65868ab 6 PinName NCS,
harryeakins 3:e72ad65868ab 7 PinName NIRQ):spi(SDI, SDO, SCK),
harryeakins 3:e72ad65868ab 8 NCS(NCS), NIRQ(NIRQ) {
harryeakins 3:e72ad65868ab 9 this->initialized = false;
harryeakins 3:e72ad65868ab 10 this->trans = false;
harryeakins 3:e72ad65868ab 11
harryeakins 3:e72ad65868ab 12 this->spi.format(16,0);
harryeakins 3:e72ad65868ab 13 this->spi.frequency(2000000);
harryeakins 3:e72ad65868ab 14 this->NCS = 1;
harryeakins 3:e72ad65868ab 15
harryeakins 3:e72ad65868ab 16 init();
harryeakins 3:e72ad65868ab 17 mode(false);// Receiver
harryeakins 3:e72ad65868ab 18 flush();
harryeakins 3:e72ad65868ab 19 }
harryeakins 3:e72ad65868ab 20
harryeakins 3:e72ad65868ab 21
harryeakins 3:e72ad65868ab 22 /* Reads a byte of data from the RF module's buffer
harryeakins 3:e72ad65868ab 23 This is a blocking call */
harryeakins 3:e72ad65868ab 24 unsigned char RF12B::read() {
harryeakins 3:e72ad65868ab 25 if (!initialized || trans) {
harryeakins 3:e72ad65868ab 26 mode(false); //Receiver
harryeakins 3:e72ad65868ab 27 trans = false;
harryeakins 3:e72ad65868ab 28 initialized = true;
harryeakins 3:e72ad65868ab 29 }
harryeakins 3:e72ad65868ab 30
harryeakins 3:e72ad65868ab 31 unsigned int data;
harryeakins 3:e72ad65868ab 32 while (1) {
harryeakins 3:e72ad65868ab 33 data = writeCmd(0x0000);
harryeakins 3:e72ad65868ab 34 if ( (data&0x8000) ) {
harryeakins 3:e72ad65868ab 35 data = writeCmd(0xB000);
harryeakins 3:e72ad65868ab 36 return (data&0x00FF);
harryeakins 3:e72ad65868ab 37 }
harryeakins 3:e72ad65868ab 38 }
harryeakins 3:e72ad65868ab 39 }
harryeakins 3:e72ad65868ab 40
harryeakins 3:e72ad65868ab 41 /* Sends a byte of data to the RF module for transmission */
harryeakins 3:e72ad65868ab 42 void RF12B::write(unsigned char *data, unsigned int length) {
harryeakins 3:e72ad65868ab 43 if (!initialized || !trans) {
harryeakins 3:e72ad65868ab 44 mode(true); //Transmitter
harryeakins 3:e72ad65868ab 45 trans = true;
harryeakins 3:e72ad65868ab 46 initialized = true;
harryeakins 3:e72ad65868ab 47 }
harryeakins 3:e72ad65868ab 48 writeCmd(0x0000);
harryeakins 3:e72ad65868ab 49 send(0xAA); // PREAMBLE
harryeakins 3:e72ad65868ab 50 send(0xAA);
harryeakins 3:e72ad65868ab 51 send(0xAA);
harryeakins 3:e72ad65868ab 52 send(0x2D); // SYNC
harryeakins 3:e72ad65868ab 53 send(0xD4);
harryeakins 3:e72ad65868ab 54 for (int i=0; i<length; i++) {
harryeakins 3:e72ad65868ab 55 send(data[i]);
harryeakins 3:e72ad65868ab 56 }
harryeakins 3:e72ad65868ab 57 send(0xAA); // DUMMY BYTES
harryeakins 3:e72ad65868ab 58 send(0xAA);
harryeakins 3:e72ad65868ab 59 send(0xAA);
harryeakins 3:e72ad65868ab 60
harryeakins 3:e72ad65868ab 61 mode(false);
harryeakins 3:e72ad65868ab 62 trans = false;
harryeakins 3:e72ad65868ab 63 }
harryeakins 3:e72ad65868ab 64
harryeakins 3:e72ad65868ab 65 void RF12B::send(unsigned char data) {
harryeakins 3:e72ad65868ab 66 while (NIRQ);
harryeakins 3:e72ad65868ab 67 writeCmd(0xB800 + data);
harryeakins 3:e72ad65868ab 68 }
harryeakins 3:e72ad65868ab 69
harryeakins 3:e72ad65868ab 70 /* Flushes all data from the RF module's buffer */
harryeakins 3:e72ad65868ab 71 void RF12B::flush() {
harryeakins 3:e72ad65868ab 72 if (!trans) {
harryeakins 3:e72ad65868ab 73 writeCmd(0xCA81);
harryeakins 3:e72ad65868ab 74 writeCmd(0xCA83);
harryeakins 3:e72ad65868ab 75 }
harryeakins 3:e72ad65868ab 76 };
harryeakins 3:e72ad65868ab 77
harryeakins 3:e72ad65868ab 78 /* Initialises the RF12B module as transmitter
harryeakins 3:e72ad65868ab 79 or receiver. This should be called after the
harryeakins 3:e72ad65868ab 80 RF module has fully started up (give it a
harryeakins 3:e72ad65868ab 81 few hundred ms) */
harryeakins 3:e72ad65868ab 82 void RF12B::init() {
harryeakins 3:e72ad65868ab 83
harryeakins 3:e72ad65868ab 84 writeCmd(0x80E7); //EL,EF,868band,12.0pF
harryeakins 3:e72ad65868ab 85 mode(false);
harryeakins 3:e72ad65868ab 86 trans = false;
harryeakins 3:e72ad65868ab 87 writeCmd(0xA640); //frequency select
harryeakins 3:e72ad65868ab 88 writeCmd(0xC647); //4.8kbps
harryeakins 3:e72ad65868ab 89 writeCmd(0x94A0); //VDI,FAST,134kHz,0dBm,-103dBm
harryeakins 3:e72ad65868ab 90 writeCmd(0xC2AC); //AL,!ml,DIG,DQD4
harryeakins 3:e72ad65868ab 91 writeCmd(0xCA81); //FIFO8,SYNC,!ff,DR
harryeakins 3:e72ad65868ab 92 writeCmd(0xCED4); //SYNC=2DD4
harryeakins 3:e72ad65868ab 93 writeCmd(0xC483); //@PWR,NO RSTRIC,!st,!fi,OE,EN
harryeakins 3:e72ad65868ab 94 writeCmd(0x9850); //!mp,90kHz,MAX OUT
harryeakins 3:e72ad65868ab 95 writeCmd(0xCC17); //OB1, COB0, LPX, Iddy, CDDITCBW0
harryeakins 3:e72ad65868ab 96 writeCmd(0xE000); //NOT USED
harryeakins 3:e72ad65868ab 97 writeCmd(0xC800); //NOT USED
harryeakins 3:e72ad65868ab 98 writeCmd(0xC040); //1.66MHz,2.2V
harryeakins 3:e72ad65868ab 99
harryeakins 3:e72ad65868ab 100 initialized = true;
harryeakins 3:e72ad65868ab 101 }
harryeakins 3:e72ad65868ab 102
harryeakins 3:e72ad65868ab 103 void RF12B::mode(bool trans) {
harryeakins 3:e72ad65868ab 104 if (trans) {
harryeakins 3:e72ad65868ab 105 writeCmd(0x8239); //!er,!ebb,ET,ES,EX,!eb,!ew,DC
harryeakins 3:e72ad65868ab 106 } else {
harryeakins 3:e72ad65868ab 107 writeCmd(0x8299); //er,!ebb,ET,ES,EX,!eb,!ew,DC
harryeakins 3:e72ad65868ab 108 }
harryeakins 3:e72ad65868ab 109 }
harryeakins 3:e72ad65868ab 110
harryeakins 3:e72ad65868ab 111 unsigned int RF12B::writeCmd(unsigned int cmd) {
harryeakins 3:e72ad65868ab 112 unsigned int recv;
harryeakins 3:e72ad65868ab 113 NCS = 0;
harryeakins 3:e72ad65868ab 114 recv = spi.write(cmd);
harryeakins 3:e72ad65868ab 115 NCS = 1;
harryeakins 3:e72ad65868ab 116 return recv;
harryeakins 3:e72ad65868ab 117 }