Guzunty Pi 8p8i core testing notes

I used a scope to check out the GP P1 header pins' waveforms.  P1-1 and P1-3 display pulses of frequency  of period 75 mS.    The Guzunty Pi's demo program is in C and a bit difficult for me to understand what is going on.  So I think I better write my own newbie Python program to do the testing.



void exercise_pwms() {
  unsigned char payload[2];

  reg += dir;
  if (reg == 7 || reg == 0) {
    dir = -dir;
  }
  values[reg] = 0x1f;
  int i;
  for(i = 0; i < 8; i++) {
    payload[0] = i;
    payload[1] = 0x1f - values[i];
    if (values[i] > 1) {
      values[i] -= 2;
    }
    else {
      values[i] = 0;
    }
    gz_spi_write(payload);
  }
  usleep(100000);
}

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