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FYOL.1
Visitor II
January 23, 2025
Question

STM32F030c8 ADC Multiple Channel Regular conversion mode Problem

  • January 23, 2025
  • 1 reply
  • 606 views

Hello.

I need 9 channel ADC data on STM32F030 MCU.

I want to read ADC CH0, ADC CH1.... ADC CH8 in order. (PA0, PA1, .... PA7, PB0)

 

It will be a simple application. I don't need DMA. 

I could not change the channel in Regular Conversion. I tried to read two channels to try. I always read the data of channel 0. I have a code like this.

 

For testing I wanted to read PA0 and PA1 data.

 

 

 

	/*Channel 0 (PA0) Selecting. */		
	ADC_CH_Cfg.Channel = ADC_CHANNEL_0; //Channel Select 
 ADC_CH_Cfg.Rank = ADC_RANK_CHANNEL_NUMBER; 
 ADC_CH_Cfg.SamplingTime = ADC_SAMPLETIME_71CYCLES_5;		
	if (HAL_ADC_ConfigChannel(&hadc, &ADC_CH_Cfg) != HAL_OK) //Kanal Ayarlaniyor
	{
	 Error_Handler();
	}
	if (HAL_ADC_Start(&hadc) != HAL_OK) //ADC Start
 {
 Error_Handler();
 }
	if (HAL_ADC_PollForConversion(&hadc, HAL_MAX_DELAY) != HAL_OK)//Donusumun tamamlanmasini bekle
	{
	 Error_Handler();
	} 
	ADC_Data[0]=HAL_ADC_GetValue(&hadc); //Get ADC value
	HAL_ADC_Stop(&hadc);
	HAL_Delay(100);
		
	/*Channel 1 (PA1) Selecting. */
	ADC_CH_Cfg.Channel = ADC_CHANNEL_1; //Channel Select 
	ADC_CH_Cfg.Rank = ADC_RANK_CHANNEL_NUMBER;
 ADC_CH_Cfg.SamplingTime = ADC_SAMPLETIME_71CYCLES_5;		
	if (HAL_ADC_ConfigChannel(&hadc, &ADC_CH_Cfg) != HAL_OK)
	{
	 Error_Handler();
	}
	if (HAL_ADC_Start(&hadc) != HAL_OK) //ADC Start
 {
 Error_Handler();
 }
	if (HAL_ADC_PollForConversion(&hadc, HAL_MAX_DELAY) != HAL_OK)//Donusumun tamamlanmasini bekle
	{
	 Error_Handler();
	} 
	ADC_Data[1]=HAL_ADC_GetValue(&hadc); //Get ADC value
	HAL_ADC_Stop(&hadc);
	HAL_Delay(100);

 

 

My ADC settings are as follows.

 

 

 hadc.Instance = ADC1;
 hadc.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;
 hadc.Init.Resolution = ADC_RESOLUTION_12B;
 hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
 hadc.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD;
 hadc.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
 hadc.Init.LowPowerAutoWait = DISABLE;
 hadc.Init.LowPowerAutoPowerOff = DISABLE;
 hadc.Init.ContinuousConvMode = DISABLE;
 hadc.Init.DiscontinuousConvMode = DISABLE;
 hadc.Init.ExternalTrigConv = ADC_SOFTWARE_START;
 hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
 hadc.Init.DMAContinuousRequests = DISABLE;
 hadc.Init.Overrun = ADC_OVR_DATA_PRESERVED;
 if (HAL_ADC_Init(&hadc) != HAL_OK)
 {
 Error_Handler();
 }

 

 

What could be the problem? ADC always outputs Channel 0 data. 

 

    This topic has been closed for replies.

    1 reply

    H
    Hl_st
    ST Employee
    February 3, 2025

    Hello,

    the easiest way how to switch between reading each ADC channels is to use direct register control as it is in this example:

     /* read analog value from PA0 */
 MODIFY_REG(ADC1->CHSELR,0xFFFFFF,ADC_CHANNEL_0);
 HAL_ADC_Start(&hadc1);
 HAL_ADC_PollForConversion(&hadc1, 100);
 uint8_t res = HAL_ADC_GetValue(&hadc1);
 printf("resA0:%d\n\r", res);
 HAL_ADC_Stop(&hadc1);

 /* read analog value from PA1 */
 MODIFY_REG(ADC1->CHSELR,0xFFFFFF,ADC_CHANNEL_1);
 HAL_ADC_Start(&hadc1);
 HAL_ADC_PollForConversion(&hadc1, 100);
 res = HAL_ADC_GetValue(&hadc1);
 printf("resA1:%d\n\r", res);
 HAL_ADC_Stop(&hadc1);

    where is used the same ADC configuration as in your code

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