Vybrid ProcessorsのトピックVF61 Linux SPI DMA support

VF61 Linux SPI DMA support

olegpetrakivsky — Thu, 07 Apr 2016 06:08:29 GMT

spi-fsl-dspi driver does not supports DMA. I made some driver modification for DMA support.

After code test I got next result. DMA transmit is ok. DMA receives about 50% of lost packets (some parts of buffer contents previous message). The issue is in DMA. Not all data are copied from device fifo into memory. RXCTR = 0 in rx callback transaction indicates that data is read. SPIx_RXFRn register shows a new correct value. Do you have idea about reason of bad DMA transfers? Draft code is attached.

Original Attachment has been moved to: spi-fsl-dspi.c.zip

Re: VF61 Linux SPI DMA support

karina_valencia — Mon, 11 Apr 2016 21:24:11 GMT

timesyssupport can you help here?

Re: VF61 Linux SPI DMA support

karina_valencia — Mon, 18 Apr 2016 15:47:37 GMT

Timesys Support do you have an update?

Re: VF61 Linux SPI DMA support

olegpetrakivsky — Tue, 19 Apr 2016 05:06:42 GMT

Check VF61 Linux SPI DMA support - Toradex Community

Re: VF61 Linux SPI DMA support

timesyssupport — Wed, 20 Apr 2016 13:37:41 GMT

Hi Oleg Petrakivskyi,

Apologies for our delayed response.

From your information, DMA transmission is fine. Overall domination among the bus is changed into the interrupt controller after the CPU acknowledges DMA request, to verify Rx FIFO - could you please share your slave peripheral device hardware information with us. It'll help us to debug/reproduce your issue in my end.

Thanks

Timesys Support

This an automatic process. We are marking this post as s...

CommunityBot — Thu, 03 Sep 2020 18:45:34 GMT

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