STM32F4VET6 DMA ADC half callback after buffer is full

[fufu]

So,I set my DMA at circular mode ,adc at continuous mode ,but when I debug the timing to get into HAL_ADC_ConvHalfCpltCallback(),I found the buffer is already fulled,can someone tell me what's going on?

[SofLit · Accepted solution]

Hello,

Because it's not possible to stop ADC while debugging. See this thread.

The only solution I see, is to trigger the ADC with a timer and freeze its counting when the CPU is halted. This is done by writing to DBGMCU_APB2_FZ register:

See this thread.

Hope it helps.