321 lines
8.4 KiB
C++
321 lines
8.4 KiB
C++
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#include "IRremote.h"
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//+=============================================================================
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// Gets one undecoded level at a time from the raw buffer.
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// The RC5/6 decoding is easier if the data is broken into time intervals.
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// E.g. if the buffer has MARK for 2 time intervals and SPACE for 1,
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// successive calls to getRClevel will return MARK, MARK, SPACE.
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// offset and used are updated to keep track of the current position.
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// t1 is the time interval for a single bit in microseconds.
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// Returns -1 for error (measured time interval is not a multiple of t1).
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//
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#if (DECODE_RC5 || DECODE_RC6)
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int getRClevel(decode_results *results, unsigned int *offset, int *used, int t1) {
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int width;
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int val;
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int correction;
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int avail;
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if (*offset >= results->rawlen) {
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return SPACE; // After end of recorded buffer, assume SPACE.
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}
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width = results->rawbuf[*offset];
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val = ((*offset) % 2) ? MARK : SPACE;
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correction = (val == MARK) ? MARK_EXCESS_MICROS : - MARK_EXCESS_MICROS;
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if (MATCH(width, (t1) + correction)) {
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avail = 1;
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} else if (MATCH(width, (2 * t1) + correction)) {
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avail = 2;
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} else if (MATCH(width, (3 * t1) + correction)) {
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avail = 3;
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} else {
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return -1;
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}
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(*used)++;
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if (*used >= avail) {
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*used = 0;
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(*offset)++;
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}
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DBG_PRINTLN((val == MARK) ? "MARK" : "SPACE");
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return val;
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}
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#endif
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//==============================================================================
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// RRRR CCCC 55555
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// R R C 5
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// RRRR C 5555
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// R R C 5
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// R R CCCC 5555
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//
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// NB: First bit must be a one (start bit)
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//
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#define MIN_RC5_SAMPLES 11
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#define RC5_T1 889
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#define RC5_RPT_LENGTH 46000
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//+=============================================================================
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#if SEND_RC5
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void IRsend::sendRC5(unsigned long data, int nbits) {
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// Set IR carrier frequency
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enableIROut(36);
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// Start
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mark(RC5_T1);
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space(RC5_T1);
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mark(RC5_T1);
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// Data - Biphase code MSB first
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for (unsigned long mask = 1UL << (nbits - 1); mask; mask >>= 1) {
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if (data & mask) {
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space(RC5_T1); // 1 is space, then mark
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mark(RC5_T1);
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} else {
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mark(RC5_T1);
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space(RC5_T1);
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}
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}
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space(0); // Always end with the LED off
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}
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void IRsend::sendRC5ext(uint8_t addr, uint8_t cmd, boolean toggle) {
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// Set IR carrier frequency
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enableIROut(36);
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uint8_t addressBits = 5;
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uint8_t commandBits = 7;
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// unsigned long nbits = addressBits + commandBits;
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// Start
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mark(RC5_T1);
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// Bit #6 of the command part, but inverted!
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uint8_t cmdBit6 = (1UL << (commandBits - 1)) & cmd;
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if (cmdBit6) {
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// Inverted (1 -> 0 = mark-to-space)
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mark(RC5_T1);
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space(RC5_T1);
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} else {
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space(RC5_T1);
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mark(RC5_T1);
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}
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commandBits--;
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// Toggle bit
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static int toggleBit = 1;
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if (toggle) {
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if (toggleBit == 0) {
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toggleBit = 1;
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} else {
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toggleBit = 0;
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}
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}
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if (toggleBit) {
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space(RC5_T1);
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mark(RC5_T1);
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} else {
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mark(RC5_T1);
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space(RC5_T1);
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}
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// Address
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for (uint8_t mask = 1UL << (addressBits - 1); mask; mask >>= 1) {
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if (addr & mask) {
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space(RC5_T1); // 1 is space, then mark
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mark(RC5_T1);
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} else {
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mark(RC5_T1);
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space(RC5_T1);
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}
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}
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// Command
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for (uint8_t mask = 1UL << (commandBits - 1); mask; mask >>= 1) {
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if (cmd & mask) {
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space(RC5_T1); // 1 is space, then mark
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mark(RC5_T1);
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} else {
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mark(RC5_T1);
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space(RC5_T1);
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}
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}
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space(0); // Always end with the LED off
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}
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#endif
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//+=============================================================================
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#if DECODE_RC5
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bool IRrecv::decodeRC5() {
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int nbits;
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long data = 0;
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int used = 0;
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unsigned int offset = 1; // Skip gap space
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if (results.rawlen < MIN_RC5_SAMPLES + 2) {
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return false;
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}
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// Get start bits
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if (getRClevel(&results, &offset, &used, RC5_T1) != MARK) {
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return false;
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}
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if (getRClevel(&results, &offset, &used, RC5_T1) != SPACE) {
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return false;
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}
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if (getRClevel(&results, &offset, &used, RC5_T1) != MARK) {
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return false;
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}
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/*
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* Get data bits - MSB first
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*/
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for (nbits = 0; offset < results.rawlen; nbits++) {
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int levelA = getRClevel(&results, &offset, &used, RC5_T1);
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int levelB = getRClevel(&results, &offset, &used, RC5_T1);
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if ((levelA == SPACE) && (levelB == MARK)) {
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data = (data << 1) | 1;
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} else if ((levelA == MARK) && (levelB == SPACE)) {
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data = (data << 1) | 0;
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} else {
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return false;
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}
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}
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// Success
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results.bits = nbits;
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results.value = data;
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results.decode_type = RC5;
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return true;
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}
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bool IRrecv::decodeRC5(decode_results *aResults) {
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bool aReturnValue = decodeRC5();
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*aResults = results;
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return aReturnValue;
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}
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#endif
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//+=============================================================================
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// RRRR CCCC 6666
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// R R C 6
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// RRRR C 6666
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// R R C 6 6
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// R R CCCC 666
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//
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// NB : Caller needs to take care of flipping the toggle bit
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//
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#define MIN_RC6_SAMPLES 1
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#define RC6_HEADER_MARK 2666
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#define RC6_HEADER_SPACE 889
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#define RC6_T1 444
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#define RC6_RPT_LENGTH 46000
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#if SEND_RC6
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void IRsend::sendRC6(unsigned long data, int nbits) {
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// Set IR carrier frequency
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enableIROut(36);
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// Header
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mark(RC6_HEADER_MARK);
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space(RC6_HEADER_SPACE);
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// Start bit
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mark(RC6_T1);
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space(RC6_T1);
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// Data
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for (unsigned long i = 1, mask = 1UL << (nbits - 1); mask; i++, mask >>= 1) {
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// The fourth bit we send is a "double width trailer bit"
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int t = (i == 4) ? (RC6_T1 * 2) : (RC6_T1);
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if (data & mask) {
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mark(t);
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space(t);
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} else {
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space(t);
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mark(t);
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}
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}
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space(0); // Always end with the LED off
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}
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#endif
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//+=============================================================================
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#if DECODE_RC6
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bool IRrecv::decodeRC6() {
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int nbits;
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long data = 0;
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int used = 0;
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unsigned int offset = 1; // Skip first space
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if (results.rawlen < MIN_RC6_SAMPLES) {
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return false;
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}
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// Initial mark
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if (!MATCH_MARK(results.rawbuf[offset], RC6_HEADER_MARK)) {
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return false;
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}
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offset++;
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if (!MATCH_SPACE(results.rawbuf[offset], RC6_HEADER_SPACE)) {
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return false;
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}
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offset++;
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// Get start bit (1)
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if (getRClevel(&results, &offset, &used, RC6_T1) != MARK) {
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return false;
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}
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if (getRClevel(&results, &offset, &used, RC6_T1) != SPACE) {
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return false;
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}
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for (nbits = 0; offset < results.rawlen; nbits++) {
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int levelA, levelB; // Next two levels
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levelA = getRClevel(&results, &offset, &used, RC6_T1);
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if (nbits == 3) {
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// T bit is double wide; make sure second half matches
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if (levelA != getRClevel(&results, &offset, &used, RC6_T1)) {
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return false;
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}
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}
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levelB = getRClevel(&results, &offset, &used, RC6_T1);
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if (nbits == 3) {
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// T bit is double wide; make sure second half matches
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if (levelB != getRClevel(&results, &offset, &used, RC6_T1)) {
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return false;
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}
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}
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if ((levelA == MARK) && (levelB == SPACE)) {
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data = (data << 1) | 1; // inverted compared to RC5
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} else if ((levelA == SPACE) && (levelB == MARK)) {
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data = (data << 1) | 0;
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} else {
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return false; // Error
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}
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}
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// Success
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results.bits = nbits;
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results.value = data;
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results.decode_type = RC6;
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return true;
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}
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bool IRrecv::decodeRC6(decode_results *aResults) {
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bool aReturnValue = decodeRC6();
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*aResults = results;
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return aReturnValue;
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}
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#endif
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