Why eDMA not work? RT1170EVK (LPADC to memory)

[auftrag2021]

HW: RT1170EVK

Target: move the RESFIFO from LPADC1 to dstAddr

Configuration in eDMA:

Configuration in LPADC1

start LPADC1 per SW in Main()

LPADC_DoSoftwareTrigger(LPADC1, 1U);

The problem is, the callback from eDMA function was never called in my application. Why? 

So far as I understand, I trigger the LPADC1 per SW, after the watermark is running out, the LPADC1 trigger the DMA request, then the DMA get the result from LPADC1->RESFIFO, because I set the Minor and Major both as 4-Bytes, the eDMA should activate the callback after 4-Byte is transfered, right? where do I do wrong?

p.s. I extra tested the eDMA alone with SW trigger (EDMA_StartTransfer(&DMA0_CH0_Handle);), the callback function worked pretty well. The eDMA itself has no problem.

[Hui_Ma]

Hi,

Sorry for the later reply.

Besides of initialize LPCADC1 and eDMA module, it also needs to config the DMAMUX.

Please refer below code just an example for your reference:

Wish it helps.

Mike

[auftrag2021 · Accepted solution]

thanks for your attention.

the issue was solved, but not in your way. the DMAMUX was correctly configured. 

The problem was, I did set the watermark as 1, when I change the value to 0. It's fine to trigger the callback function from eDMA

[akhil__]

Hi,

Could you please share this file for reference? I'm facing some issues while configuring LPADC using DMA. Having access to the file would greatly assist me in understanding the correct configuration procedure and resolving the difficulties I'm encountering. Any additional guidance or insights you can provide on LPADC configuration with DMA would be greatly appreciated. Thank you for your assistance."

[auftrag2021]

I am not using RT1176 for a long while

here is sth. I found a few years ago about the eDMA config tools problem

https://community.nxp.com/t5/MCUXpresso-Config-Tools/eMDA-config-tools/m-p/1432103#M1363

due to NXP staff reply, there are some bug in the MCUxpressor for the eDMA config tools

if you want your eDMA work properly, strictly follow the user manual instruction,  don't blindly trust the config tools

[Hui_Ma]

Thank you for the updated info.

Mike