Why is ADC + DMA not triggered?

[PJano.1]

Hi! I'm using STM32 F301C8T for my LLC converter project. I have two MOSFETs switching at variable frequencies ranging from 80kHz to 400 kHz. Due to significant noise caused by switching, I need to time the output voltage measurement between the switches of MOSFETs.

I use TIM2 for PWM to switch the MOSFETs and TIM1 to count output events of TIM2 (TIM2's arr = 4, meaning that every 5TIM2 overflows, TIM1 overflows as well). Using the debugger, I checked that TIM1 counts appropriately.

I set ADC conversion to be triggered by "Timer 1 Trigger Out Event," and it seems like the AD conversion is not triggered. (+using DMA in circular mode).

Can you guys please advise what I am doing wrong?


I start the TIMs and ADC by:

HAL_TIM_Base_Start_IT(&htim1);

HAL_ADC_Start_DMA(&hadc1,(uint32_t*) adcResultsDMA,4);

HAL_TIM_PWM_Start(&htim2, TIM_CHANNEL_2);

HAL_TIM_PWM_Start(&htim2, TIM_CHANNEL_3);

Thank you! Pj

[LCE]

in main, is dma init function called before timer and adc init? If not, place it before these inits.

[PJano.1]

Yes, it is. Main.txt attached.

[Amel NASRI]

Hi @PJano.1​ ,

Before "HAL_ADC_Start_DMA", it is required to calibrate the ADC:

HAL_ADCEx_Calibration_Start(&hadc1, ADC_SINGLE_ENDED);

Please let me know if this resolves your issue.

-Amel

[PJano.1 · Accepted solution]

Hi Amel, thanks, but this didn't solve the issue. I, however, managed to find a solution- my ADC setup in CubeMX was wrong. It should be as follows:

[Amel NASRI]

Glad to know that you found the solution. Thanks for sharing it.