Fix #10804 by running continuous ADC DMA in endless loop instead of restarting after each run to avoid losing samples (IDFGH-10140)

[Erlkoenig90]

This fixes #10804 by running the ADC DMA in a continuous loop.

• A function adc_hal_read_desc_finish is introduced to set a DMA descriptor's owner field to 1 such that it can be re-used by DMA.
• A new DMA callback function on_descr_err is added for the DSCR_ERR interrput. The interrupt is only enabled if the callback is specified. The continuous ADC driver uses this to print an error to detect DMA buffer overruns.

[CLAassistant]

All committers have signed the CLA.

[Icarus113]

Hi @Erlkoenig90 Thanks for your PR.

There was a code for the circular dma descriptors, internally. It's not merged yet.

The adc continuous mode driver is updated a bit. If you can:

• port your changes (link list change, and the dma descriptor owner change) to current driver
• decouple the gdma changes into another PR/issue

Then we can consider using this PR.

[Erlkoenig90]

Hi, thanks for the answer. Do you mean porting the changes to master branch (instead of release/v5.0)?

[Icarus113]

Do you mean porting the changes to master branch (instead of release/v5.0)?

Yes, exactly.

Sorry for being misleading in my previous post.

[Erlkoenig90]

Okay, I split the PR into #11499 for the descriptor error callback and #11500 for the ADC changes, both based on master. #11499 needs to be merge before #11500 to make the callback available.

[Icarus113]

As the splitted PRs are merged, close this issue.