Kinetis MicrocontrollersのトピックeDMA mem2mem transfer and ADC with flex scan

eDMA mem2mem transfer and ADC with flex scan

lschoenfeld — Mon, 19 Oct 2020 14:17:13 GMT

Hi, I'm workin with a KW41Z and use eDMA for ADC with flex transfer. I have a buffer with 5 channel and 32 value per channel. The 2 DMA's are working. Now I like to copy the adc results from the first Buffer to a second one with 5 channel and 3200 values per channel. Therefore I initialized an additional DMA with a tcd pool (scatter/gather). The tcd queue size is 2. In the callback function of the DMA I calculate the next dest address and set the new tcd values.

The problem I have is that only the values of the first block were copied. When I stop the scatter/gather dma the second block is also copied once.

Could someone help me. I don't know what the problem is. Attached you find the Dma.c and dma.h files.

Thanks.

I found the problem.

Sorry.

Re: eDMA mem2mem transfer and ADC with flex scan

nxf56274 — Tue, 20 Oct 2020 00:55:35 GMT

Hi,

We have the scatter_gather example. It works well. You can use this example and create different arrays to simulate the different channel. Make it works, then move this project to your application.

Have a great day,
TIC

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