DMA Bus error on source

Florijan — Tue, 11 Nov 2014 12:04:50 GMT

Hello!

I am using MKL25Z128 (mask 1N97F). The FTM timer triggers DMA ch1 which should copy PIT_CVAL0 (32 bit current value) to a 32 bit variable in RAM. But the DMA returns Bus Error on Source. If I change the source form PIT_CVAL0 to ordinary variable in RAM it works fine. My question is: Is it possible to use DMA to transfer PIT_CVAL0 (32 bit current value) to a variable in RAM using FTM trigger?

Best regards,

Florijan

Re: DMA Bus error on source

kerryzhou — Thu, 13 Nov 2014 09:19:54 GMT

Hi florijan japelj,

Thank you for your interest in kinetis product, I would like to provide service for you!
It is possible to use DMA to transfer PIT_CVAL0(32 bit current value) to SRAM , if your FTM trigger is just the DMA request.

I use the SPI transfer as the request, and it is ok to transfer PIT_VAL0 to SRAM.

Wish it helps you！

Have a great day,
Jingjing

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DMA Bus error on source

Re: DMA Bus error on source