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STM32F4VET6 DMA ADC half callback after buffer is full

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fufu
Associate

‎2024-04-11 12:44 AM

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?

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SofLit
ST Employee

‎2024-04-11 06:14 AM - edited ‎2024-04-11 06:15 AM

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:

SofLit_0-1712841049954.png

See this thread.

Hope it helps.

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.
PS: This is NOT an online support (https://ols.st.com) but a collaborative space. So please be polite in your reply. Otherwise, it will be reported as inappropriate and you will be permanently blacklisted from my help/support.

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SofLit
ST Employee

‎2024-04-11 06:14 AM - edited ‎2024-04-11 06:15 AM

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:

SofLit_0-1712841049954.png

See this thread.

Hope it helps.

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.
PS: This is NOT an online support (https://ols.st.com) but a collaborative space. So please be polite in your reply. Otherwise, it will be reported as inappropriate and you will be permanently blacklisted from my help/support.
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