I have trouble getting ADC DMA working in cubeIDE 1.9. It was working in version 1.7

[Tim Goll]

There are many guides available online that explain how to set up DMA with ADC. I followed such a guide in version 1.7 and it worked out of the box. Now I'm trying the same thing in version 1.9 and it won't work.

The first thing I noticed that the ADC Clock Prescaler setting seems to be no longer a thing.The last time I set it up, I just chose continuous conversion with a prescaler and everything worked. Even without an timer. These were my settings back then:

 

Note here that it is the same MCU on the same board in the same project. I only updated the cubeIDE.

I now tried it with a timer (which is preferred anyway) but this still doesn't work. The timer works as can be seen on the oscilloscope here:

 

The yellow line is the timer, the blue line should have a peak triggered in the convCplt interrupt. DMA is set up with a circular buffer.

Here is the setup:

• https://github.com/TimGoll/masterthesis-lcr_driver/blob/main/Core/Code/Threads/AnalogIn.c#L10-L15
• https://github.com/TimGoll/masterthesis-lcr_driver/blob/main/Core/Code/Logic/AnaRP.c#L3-L8
• https://github.com/TimGoll/masterthesis-lcr_driver/blob/main/Core/Src/main.c#L101

I'd really appreciate any input on this because at this point I'm not sure if I'm doing something wrong, or if there is a bug in the cubeIDE.

MCU: STM32H743ZI on a nucleo board.

[TDK · Accepted solution]

Sounds like this CubeMX code generation bug again:

https://community.st.com/s/question/0D73W000001O3S0SAK/detail?s1oid=00Db0000000YtG6&s1nid=0DB0X000000DYbd&emkind=chatterCommentNotification&s1uid=0050X000007vmts&emtm=1648116562796&fromEmail=1&s1ext=0

[Tim Goll]

Thanks a lot, this means it's not me. But since this is known since a month with no announced update so far I have to wonder what the next step would be. Downgrade the IDE version? This could cause problems with ST-Link. But waiting a few weeks is no option either.

[TDK]

Next step is to wait, downgrade the IDE, or address/correct for the error within user code. Up to you.
It’s likely to be longer than a few weeks.

[Tim Goll]

For anyone else reading this: I downgraded to version 1.7.0 again. Since my ioc file was updated to 1.9.0 it was no longer readable. I therefore had to change the version flags in it and everything seems to be fixed:

 

Thank you again TDK. I'm a bit confused why I didn't find the open issue by myself because I did nothing but trying to solve this issue for the last two days. I honestly can't understand how a company like ST won't fix such an breaking issue within days. Or even hours. Seems highly unprofessional.

[eos1d3]

The GUI just does not allow me to enable Continuous DMA mode for G031 too. This problem also happens in MX. I have to downgrade to 1.8 and change ioc version too.

This bug is not small and ST may be too big that they can't handle it.