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Measuring frequency and duty cycle of two independent signals.

Question asked by Shlomi Weiner on Jun 22, 2017

Hello all,

I am using two different timers(TIM2 and TIM3) in order two measure frequency and duty cycle of two independent signals.

As the example guides, i used the  HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim) function to make those measurements, but I succeeded  to get a measurement only for one signal.

What I have to change/add to this function in order to make those two measurements  in the same time.


Here is the full function:

void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
  if (htim->Channel == HAL_TIM_ACTIVE_CHANNEL_2)
    /* Get the Input Capture value */
    uwIC2Value = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_2);

    if (uwIC2Value != 0)
      /* Duty cycle computation */
      uwDutyCycle = ((HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_1)) * 100) / uwIC2Value;

      /* uwFrequency computation
      TIM1 counter clock = (RCC_Clocks.HCLK_Frequency) */
      uwFrequency = (HAL_RCC_GetHCLKFreq()/2)  / uwIC2Value;
      uwDutyCycle = 0;
      uwFrequency = 0;