MPC5xxxのトピックRe: MPC5744P eTimer-CTU0-ADC-DMA

MPC5744P eTimer-CTU0-ADC-DMA

boshimao — Wed, 29 Mar 2017 11:51:14 GMT

I now have a very difficult problem, please help me. My IDE is S32. I now use eTimer every 100us trigger CTU0, and then start 4 channels of the ADC0 conversion, and then CTU0 FIFO0 to the threshold to start the DMA transfer, and now DMA can not start or power on once, turn off the DMA when the ADC0 conversion is normal. Annex is my project, please help me look, I have been debugging for a week.thanks

Original Attachment has been moved to: Test_eTimer_CTU_ADC_DMA.rar

Re: MPC5744P eTimer-CTU0-ADC-DMA

PetrS — Thu, 30 Mar 2017 10:09:15 GMT

Hi,

I was not able to compile your code. So I created new project in DS and copy your code.

Then I just enabled DMA channel request within DMA init function, and the code is working. Destination buffer is getting apdated with ADC result. See attached example.

BR Petr

Re: MPC5744P eTimer-CTU0-ADC-DMA

boshimao — Thu, 30 Mar 2017 11:16:50 GMT

Hi,

Thank you for your answer. The data inside the array does not change, AD conversion out of the results should be a small change in the number. And the results of the array 0 and 1 is 0, see annex. Picture 1 is in the S32 variable window to see , The picture 2 is the computer through the CAN bus to receive the data.

Picture 1

Picture 2

Re: MPC5744P eTimer-CTU0-ADC-DMA

PetrS — Thu, 30 Mar 2017 12:01:37 GMT

Disable the Data cache. It is enabled during the startup. Go to startup.S file and comment section of code where data cache is enabled (lines 207-233)

BR, Petr

Re: MPC5744P eTimer-CTU0-ADC-DMA

boshimao — Thu, 30 Mar 2017 12:57:32 GMT

Close the data cache has no effect, the following figure is a comment code screenshot.

Re: MPC5744P eTimer-CTU0-ADC-DMA

boshimao — Fri, 31 Mar 2017 03:57:46 GMT

I turned the community, to find a similar problem, the answer is to close the buffer, but inside the code is not complete, you can help me see,https://community.nxp.com/thread/432340