timer + ADC + DMA (ADC ISR overrun)

Hi all,

I want to use timer 2 to trigger ADC function (ADC3) on STM32H743ZI2 platform.

After DMA & timer starting, I stuck in HAL_ADC_IRQHandler().

 /* Multimode not set or feature not available or ADC independent */
 if ((hadc->Instance->CFGR & ADC_CFGR_DMNGT) != 0UL)
 {
 overrun_error = 1UL;
 }

Can somebody help me what's going on?

The attached file is cubeMx setting & main file.

Thanks.

This topic has been closed for replies.

> hadc3.Init.ContinuousConvMode = ENABLE;

> sConfig.SamplingTime = ADC_SAMPLETIME_1CYCLE_5;

Once it triggers once, the ADC will continue to free-run. If you want one conversion per timer update, disable ContinuousConvMode .

At a sampling time of 1.5 cycles, maybe the DMA can't keep up and you get an overrun. Bump this up to max unless you have a reason not to.

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Associate II

Hi TDK,

But I don't know the actual reason.

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