MPC5775 eqADC with eDMA problem related with eDMA puts CFIFO in wrong order

[0xEC]

hi everyone, 

I am working with MPC5775E microcontroller. I use eqADC with eDMA to fill CFIFO and to get results from RFIFO. I attached photos which show the settings of eqADC and eDMA. My problem is eDMA puts last command into first place of the CFIFO register which is set as EOQ (end of queue) in eqADC conversion command configuration and also result FIFO follows this wrong order. Could anyone help me on this topic?

This is my main code where the eqADC and eDMA are configured and started.

main

This is content of CFIFO vs command array, command array's last entry is seen on the top of the CFIFO

command array

 

CFIFO content

peripherals settings are as follows:

conversion command configurationcommand FIFO configurationresult FIFO configurationeDMA configuration

Best,

[davidtosenovjan]

Command/result buffers are 4-stage circular buffers, I don't see any issue unless it is converted out of order (i.e. result swap).

[0xEC]

hi David thanks for reply,

Result FIFO is in order same as system memory command array, can we say it is okay to use like this ?

[davidtosenovjan · Accepted solution]

Certainly yes.

Otherwise please see

https://community.nxp.com/t5/MPC5xxx-Knowledge-Base/EB00927-eQADC-Avoiding-Unintended-Result-Swap/ta...