STM32G431C + ADC + DMA

[AChas.1]

I'm using ADC with DMA in a large project, and faced some very strange problem: 

If I'm using DMA2 Channel 6 - ADC works correctly 

If I'm using DMA2 Channel 1 - the SW end up in Hard Fault 

The configuration is default. 

This is how I start the conversation 

 HAL_ADCEx_Calibration_Start(&hadc1, ADC_SINGLE_ENDED);
 // Start the ADC in DMA mode
 HAL_ADC_Start_DMA(&hadc1, (uint32_t*) g_ADC_values, ADC_BUFFER_LENGTH);

[TDK]

What is the stack trace when the hard fault happens? What code is causing it to hard fault?

[AChas.1]

The random code, it depends when ADC triggers the DMA 

[TDK]

I can't make sense of this answer.

Using DMA doesn't cause a hard fault in itself. It's possible the DMA is misconfigured, or trying to write somewhere it cannot. Look for the reason it's hard faulting and go from there.

[KDJEM.1]

Hello @AChas.1 ;

 

I recommend you to look at How to debug a HardFault on an Arm® Cortex®-M STM32  - STMicroelectronics Community article may help you to debug faults on Arm Cortex®-M based STM32 devices.

 

I hope this help you.

Thank you.

Kaouthar

[AChas.1]

Long story short, I can't avoid this problem but I'm almost shure it was coz of RAM tension I've got in my firmware. I lose my patience and just switch to STM32G491 - now it works like a charm :)