topic Re: Problems about Major Loop configuration when DMA is used for SPI in S32K

Problems about Major Loop configuration when DMA is used for SPI

FOR_EACH — Wed, 21 Sep 2022 06:31:45 GMT

Using DMA SPI in S32K3, how can I operate the target address offset after the Major Loop completes a count? Now i have achieved the Minor Loop target address offset, how can i configure the Major Loop target address offset.

I want to achieve a Minor Loop target address offset of - 1byte and a Major Loop target address offset of 8Byte. How do I configure DMA?

Re: Problems about Major Loop configuration when DMA is used for SPI

JRoberto — Thu, 22 Sep 2022 17:16:51 GMT

Hello @FOR_EACH

You can use this parameters to set the offset after every minor or major loop

Best Regards!

Re: Problems about Major Loop configuration when DMA is used for SPI

FOR_EACH — Fri, 23 Sep 2022 07:40:10 GMT

Hello @JRoberto

Can you give an example of how to configure? Because I've configured it like this, but it doesn't achieve the effect I want.

Re: Problems about Major Loop configuration when DMA is used for SPI

JRoberto — Wed, 28 Sep 2022 20:07:16 GMT

Could you confirm this is the desired behavior please?

Re: Problems about Major Loop configuration when DMA is used for SPI

FOR_EACH — Sat, 08 Oct 2022 06:59:10 GMT

That's what I want.

Re: Problems about Major Loop configuration when DMA is used for SPI

JRoberto — Mon, 17 Oct 2022 22:05:05 GMT

Sure,

I edited the dma_ip example to create the desired behavior on the channel 0. The only difference is that I set a space of 8 addresses in the destination buffer.