ir_Denon.cpp

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#include "IRremote.h"
 
// Reverse Engineered by looking at RAW dumps generated by IRremote
 
// I have since discovered that Denon publish all their IR codes:
//  https://www.google.co.uk/search?q=DENON+MASTER+IR+Hex+Command+Sheet
//  -> http://assets.denon.com/documentmaster/us/denon%20master%20ir%20hex.xls
 
// Having looked at the official Denon Pronto sheet and reverse engineered
// the timing values from it, it is obvious that Denon have a range of
// different timings and protocols ...the values here work for my AVR-3801 Amp!
 
//==============================================================================
//                    DDDD   EEEEE  N   N   OOO   N   N
//                     D  D  E      NN  N  O   O  NN  N
//                     D  D  EEE    N N N  O   O  N N N
//                     D  D  E      N  NN  O   O  N  NN
//                    DDDD   EEEEE  N   N   OOO   N   N
//==============================================================================
 
#define BITS          14  // The number of bits in the command
 
#define HDR_MARK     300  // The length of the Header:Mark
#define HDR_SPACE    750  // The lenght of the Header:Space
 
#define BIT_MARK     300  // The length of a Bit:Mark
#define ONE_SPACE   1800  // The length of a Bit:Space for 1's
#define ZERO_SPACE   750  // The length of a Bit:Space for 0's
 
//+=============================================================================
//
#if SEND_DENON
void IRsend::sendDenon(unsigned long data, int nbits) {
    // Set IR carrier frequency
    enableIROut(38);
 
    // Header
    mark(HDR_MARK);
    space(HDR_SPACE);
 
    // Data
    for (unsigned long mask = 1UL << (nbits - 1); mask; mask >>= 1) {
        if (data & mask) {
            mark(BIT_MARK);
            space(ONE_SPACE);
        } else {
            mark(BIT_MARK);
            space(ZERO_SPACE);
        }
    }
 
    // Footer
    mark(BIT_MARK);
    space(0);  // Always end with the LED off
}
#endif
 
//+=============================================================================
//
#if DECODE_DENON
bool IRrecv::decodeDenon(decode_results *results) {
    unsigned long data = 0;  // Somewhere to build our code
    int offset = 1;  // Skip the Gap reading
 
    // Check we have the right amount of data
    if (irparams.rawlen != 1 + 2 + (2 * BITS) + 1) {
        return false;
    }
 
    // Check initial Mark+Space match
    if (!MATCH_MARK(results->rawbuf[offset], HDR_MARK)) {
        return false;
    }
    offset++;
 
    if (!MATCH_SPACE(results->rawbuf[offset], HDR_SPACE)) {
        return false;
    }
    offset++;
 
    // Read the bits in
    for (int i = 0; i < BITS; i++) {
        // Each bit looks like: MARK + SPACE_1 -> 1
        //                 or : MARK + SPACE_0 -> 0
        if (!MATCH_MARK(results->rawbuf[offset], BIT_MARK)) {
            return false;
        }
        offset++;
 
        // IR data is big-endian, so we shuffle it in from the right:
        if (MATCH_SPACE(results->rawbuf[offset], ONE_SPACE)) {
            data = (data << 1) | 1;
        } else if (MATCH_SPACE(results->rawbuf[offset], ZERO_SPACE)) {
            data = (data << 1) | 0;
        } else {
            return false;
        }
        offset++;
    }
 
    // Success
    results->bits = BITS;
    results->value = data;
    results->decode_type = DENON;
    return true;
}
#endif