ADC: DMA ADC value is not updating after first reading.

[Jimit7]

I have configured the ADC in DMA mode to read a single pin for measuring external voltages.
However, I’m encountering an issue where the ADC value is measured correctly on the first call, but on subsequent calls to the function, the ADC value does not get updated. It remains the same regardless of any external voltage applied.

In other words, it only shows the first measured value all the time.

Below is the configuration for the ADC:

ADC CLK is set to 12MHZ.
Below is the ADC reading function.

void ADC(void)

{

uint16_t ADC_Data;

HAL_ADCEx_Calibration_Start(&hadc1, ADC_SINGLE_ENDED);

HAL_ADC_Start_DMA(&hadc1,(uint32_t*)&ADC_Data ,1);

printf("ADC: %d\n",ADC_Data);

HAL_ADC_Stop_DMA(&hadc1);

}

Thank you,

[SofLit]

Hello,

Please provide the MCU part number.

See Tips on posting.

Thank you for your understanding.

[Jimit7]

Hi,

I using stm32wb5mmghtr6 with SDk 1.20.0

Thank you,

Jimit

[Jimit7]

Is there any update on this?
Thank you,
Jimit

[STTwo-32]

Hello @Jimit7 

The STM32WB5MMGH6TR is use an STM32WB MCUs. So, I suggest you have a look at this example and try to migrate it from the NUCLEO board to the STM32WB5MMGH6TR. it should be working fine. After that, you can understand how it works and develop your own example referring to this implementation.

Best Regards.

STTwo-32

[Jimit7]

Hi STTwo-32,

My code is based on one of the example code from Nucleo board and it does not work for me.

Thank you,

Jimit