message: add link to timing diagram in low_level.cpp
diff: @@ -463,7 +463,7 @@ static void decode_hall_samples(Encoder& enc, uint16_t GPIO_samples[num_GPIO]) {
  }
  // This is the callback from the ADC that we expect after the PWM has triggered an ADC conversion.
  -// TODO: Document how the phasing is done, link to timing diagram
  +// Timing diagram: Firmware/timing_diagram_v3.png
  void pwm_trig_adc_cb(ADC_HandleTypeDef* hadc, bool injected) {
  #define calib_tau 0.2f //@TOTO make more easily configurable
  static const float calib_filter_k = CURRENT_MEAS_PERIOD / calib_tau;
  