Method decodeDistanceWidth

src/ir_DistanceWidthProtocol.hpp:206–508

* Try to decode a pulse distance or pulse width protocol. * 1. Analyze all space and mark length * 2. Decide if we have an pulse width or distance protocol * 3. Try to decode with the mark and space data found in step 1 * No data and address decoding, only raw data as result. * * Restrictions: * Only protocols with at least 7 bits (+ start and trailing stop bit) are accepted. * Pulse or pa

 * calloc() version is 700 bytes larger :-(
 */
bool IRrecv::decodeDistanceWidth() {
    /*
     * Array for up to 49 ticks / 2500 us (or 199  ticks / 10 ms us if RAM > 2k)
     * tick array index 0 covers mark or space durations from 0 to 49 us, and index 49 from 2450 to 2499 us
     */
    uint8_t tDurationArray[DISTANCE_WIDTH_DECODER_DURATION_ARRAY_SIZE];

    /*
     * Only protocols with at least 7 bits are accepted
     */
    if (decodedIRData.rawlen < (2 * 7) + 4) {
#if defined(DEBUG) || defined(SHOW_DISTANCE_WIDTH_DECODER_ERRORS)
        Serial.print(F("PULSE_DISTANCE_WIDTH: "));
        Serial.print(F("Data length="));
        Serial.print(decodedIRData.rawlen);
        Serial.println(F(" is less than 18"));
#endif
        return false;
    }

    // Reset duration array
    memset(tDurationArray, 0, DISTANCE_WIDTH_DECODER_DURATION_ARRAY_SIZE);

    uint8_t tIndexOfMaxDuration = 0;
    /*
     * Count number of mark durations. Skip leading start and trailing stop bit.
     */
    for (IRRawlenType i = 3; i < decodedIRData.rawlen - 2; i += 2) {
#if(DISTANCE_WIDTH_DECODER_DURATION_ARRAY_SIZE > 0xFF)
        uint16_t tDurationTicks = irparams.rawbuf[i];
#else
        auto tDurationTicks = irparams.rawbuf[i];
#endif
        if (tDurationTicks < DISTANCE_WIDTH_DECODER_DURATION_ARRAY_SIZE) {
            tDurationArray[tDurationTicks]++; // count duration if less than DISTANCE_WIDTH_DECODER_DURATION_ARRAY_SIZE
            if (tIndexOfMaxDuration < tDurationTicks) {
                tIndexOfMaxDuration = tDurationTicks;
            }
        } else {
#if defined(LOCAL_DEBUG) || defined(SHOW_DISTANCE_WIDTH_DECODER_ERRORS)
            Serial.print(F("PULSE_DISTANCE_WIDTH: Mark "));
            Serial.print(tDurationTicks * MICROS_PER_TICK);
            Serial.print(F(" is longer than maximum "));
            Serial.print(DISTANCE_WIDTH_DECODER_DURATION_ARRAY_SIZE * MICROS_PER_TICK);
            Serial.print(F(" us. Index="));
            Serial.println(i);
#endif
            return false;
        }
    }

    /*
     * Aggregate mark counts to one duration bin
     */
    uint8_t tMarkTicksShort = 0;
    uint8_t tMarkTicksLong = 0;
    bool tSuccess = aggregateArrayCounts(tDurationArray, tIndexOfMaxDuration, &tMarkTicksShort, &tMarkTicksLong);
#if defined(LOCAL_DEBUG)