topic Re: IMXRT1024 EDMA - RAM Usage Approach with LPUART in i.MX RT Crossover MCUs

IMXRT1024 EDMA - RAM Usage Approach with LPUART

Lukas_Frank — Thu, 26 Aug 2021 12:05:09 GMT

Hi all,

I am working on LPUART EDMA Transfer example and I couldn’t find how system use RAM in code example. I have following questions.

Q1:Could you please help me how can I reach details?

Q2:Does DMA able to write RAM area ? And which spesific part of it ?

Q3:When DMA starts their head position again after he reached the border of memory area that it’s able to write? For example ram area start the address from 2020_0000 and ends with 2023_FFFF (OCRAM), so what is the interval eDMA can be use ?

Q4: What happens if eDMA inflate the OCRAM?

Thanks and Regards.

Re: IMXRT1024 EDMA - RAM Usage Approach with LPUART

gusarambula — Fri, 10 Sep 2021 01:37:09 GMT

Hello Lukas_Frank,

The eDMA examples do not cover all possible scenarios, my apologies for that. The eDMA module does allow to store in RAM.

Would you please elaborate more in what you mean by the eDMA inflating the OCRAM?

I see that some of your questions were already answered on the following thread so I’m including the link in case it help other community users.

https://community.nxp.com/t5/i-MX-RT/IMXRT1024-LPUART-EDMA-Loopback-Example-Without-Console-Keyboard/m-p/1335015#M16196

Regards,
Gustavo