STM32F103C8T6 ADC1 + DMA reading gets corrupted when starting ADC2 conversion.

[DBern.7]

Hi,

I'm almost new to the STM32 and have the following question:

I'm triggering multichannel ADC1 conversions using timer 1 and storing the readings in a buffer using the DMA. It works fine until I configure ADC2 (which doesn't support DMA) to be triggered by timer 2. The sole addition of HAL_ADC_Start(&hadc2); or HAL_ADC_Start_IT(&hadc2); at the beginning of the code causes corrupted readings from ADC1+DMA. What am I doing wrong? Is it possible to trigger other ADCs while using DMA with another channel?

Thanks in advance

[TDK]

Yes it's possible. Could be overloading DMA, what is your sample rate? What does "corrupted" mean exactly?

[DBern.7]

Hi, TDK

Thank you for the answer, The readings go from:

 

to only by adding HAL_ADC_Start(&hadc2);

the sample is triggered in the second event of a capture compare running at 20Khz, so I suppose the sample rate is 10Khz

Thanks in advance

[DBern.7]

Hi, TDK

Thank you for the answer, The readings go from:

to

 only by adding HAL_ADC_Start(&hadc2);

the sample is triggered in the second event of a capture compare running at 20Khz, so I suppose the sample rate is 10Khz

Thanks in advance

[DBern.7]

Changing DMA to Half Word and, consequently, the buffer data type to 16 bits did the trick. Still don't know why Thanks!