How to trigger an ADC using the PWM timer at the beginning of the period.

[NSemrHomeInit]

Hello,

I want to trig the ADC using the PWM timer,

The ADC would be triggered in the first event of the PWM "counter start".

How to wait for the ending conversion using a while loop in the PWM isr.

Could I read the ADC without using the DMA bus?

I am using the CubMx.

Thank you in advance,

S.Tarik

[Imen.D]

Hello @NSemrHomeInit​ ,

Generally with the while loop, you can do the polling technique.

Other possibility is to use the ADC EOC interrupt.

Here is one of example in the HAL within STM32CubeF4: STM32Cube_FW_F4_V1.25.2\Projects\STM324x9I_EVAL\Examples\ADC\ADC_RegularConversion_Polling

  /*##-3- Start the conversion process #######################################*/  
  if(HAL_ADC_Start(&AdcHandle) != HAL_OK)
  {
    /* Start Conversation Error */
    Error_Handler();
  }
  
  /*##-4- Wait for the end of conversion #####################################*/  
   /*  Before starting a new conversion, you need to check the current state of 
        the peripheral; if it’s busy you need to wait for the end of current
        conversion before starting a new one.
        For simplicity reasons, this example is just waiting till the end of the 
        conversion, but application may perform other tasks while conversion 
        operation is ongoing. */
  HAL_ADC_PollForConversion(&AdcHandle, 10);
  
  /* Check if the continuous conversion of regular channel is finished */
  if((HAL_ADC_GetState(&AdcHandle) & HAL_ADC_STATE_EOC_REG) == HAL_ADC_STATE_EOC_REG)
  {
    /*##-5- Get the converted value of regular channel  ######################*/
    uhADCxConvertedValue = HAL_ADC_GetValue(&AdcHandle);
  }
    
  /* Infinite loop */
  while(1)
  {
  }

I hope this helps !

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Imen