Nec1Renderer.cpp

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#include "Nec1Renderer.h"
 
// NOTE: writing intro[i++] = ... produces wrong result, compiler bug?
// (Adding a print statement immediately after, and it works :-~)
// So let's write intro[i] = ...; i++ at least for now.
 
#define MIN(a, b) ((a) < (b) ? (a) : (b))
 
const IrSignal *Nec1Renderer::newIrSignal(unsigned int D, unsigned int S, unsigned int F) {
    microseconds_t *introData = new microseconds_t[introLength];
    unsigned int i = 0U;
    uint32_t sum = 9024U + 4512U + 564U;
    introData[i] = 9024U; i++;
    introData[i] = 4512U; i++;
    lsbByte(introData, i, sum, D);
    lsbByte(introData, i, sum, S);
    lsbByte(introData, i, sum, F);
    lsbByte(introData, i, sum, 255U-F);
    introData[i] = 564U; i++;
    introData[i] = static_cast<microseconds_t>(108000UL - sum); i++;
    microseconds_t *repeatData = new microseconds_t[repeatLength];
    repeatData[0] = 9024U;
    repeatData[1] = 2256U;
    repeatData[2] = 564U;
    repeatData[3] = MIN(96156U, MICROSECONDS_T_MAX);
    return new IrSignal(introData, introLength, repeatData, repeatLength, frequency, dutyCycle);
}
 
void Nec1Renderer::lsbByte(microseconds_t *intro, unsigned int& i, uint32_t& sum, unsigned int X) {
    for (unsigned int index = 0; index < 8U; index++) {
        transmitBit(intro, i, sum, X & 1U);
        X >>= 1U;
    }
}
 
void inline Nec1Renderer::transmitBit(microseconds_t *intro, unsigned int& i, uint32_t& sum, unsigned int data) {
    intro[i++] = 564U;
    intro[i++] = data ? 1692U : 564U;
    sum += data ? 564U+1692U : 564U+564U;
}