interpreter speed @ESP32

Hi,

I am playing with an esp32 to copy codes from an infra-red controller.

I have been able to timestamp the signal edges and see how the 1's and 0's are encoded and reproduce it with the digitalPulse function.

I can also extract the bit sequence and reconstruct the signal (and avoiding the big timestamp tables).

So I have the timestamp table:

var times = [4.4,4.2,.64,1.6,.64,1.6,.69,1.6,.67,.45­,.68,.44,.64,.43,.64,.44,.67,.45,.67,1.6­,.64,1.6,.64,1.6,.67,.45,.64,.45,.67,.45­,.67,.44,.67,.45,.69,1.54,.68,1.56,.64,.­44,.64,1.56,.67,.46,.67,.45,.68,.44,.64,­.44,.67,.45,.66,.46,.66,1.57,.64,.44,.68­,1.56,.64,1.56,.67,1.57,.64,1.56,.64,46.­74,4.6,4.42,.64,1.56,.69,1.56,.67,1.56,.­69,.43,.69,.43,.64,.45,.68,.44,.68,.43,.­69,1.55,.64,1.56,.64,1.57,.68,.45,.67,.4­2,.71,.42,.69,.43,.68,.45,.67,1.56,.64,1­.56,.68,.44,.64,1.56,.69,.43,.64,.44,.64­,.43,.69,.43,.64,.44,.67,.45,.67,1.6,.64­,.44,.67,1.57,.67,1.6,.68,1.6,.64,1.6,.6­4];

Set my carrier with analogWrite().

Make the pulse train with digitalPulse() and the signal looks like the original controller on my scope.

Now, extracting the bits and trying to replay them.

var data = 0b111000001110000000011111;
  digitalPulse(D16, 0, 4.4);
  digitalPulse(D16, 1, 4.2);
  for (var i=23;i>=0;i--) {
    if (data&(1<<i)) {
      digitalPulse(D16, 0, .64);
      digitalPulse(D16, 1, 1.6);
    } else {
      digitalPulse(D16, 0, 0.64);
      digitalPulse(D16, 1, .43);
    }
  }

The first 4.4 and 4.2 pulses look good, the next ones take longer than expected. The whole train is like 50% bigger than the first one.

I believe that this is a limitation of the interpreter and I am stuck with the bit timestamp tables.

Is it correct?