ECSPI in i.MX6 is not work with Burst Mode when CS pin was set to SS.

[massohy]

Dear community member,

I am try to use ECSPI3 and ECSPI4 on i.MX6Q as SPI master device. When I use them, if I set CS pin to SS, then SPI CS signal was deactivated after each byte. But if I set CS pin to GPIO, then SPI CS signal was activated continuously while transmitting.

I think, if I want CS signal to be activated continuously, then I should set SPI clock with adding 1. But after I set it, then SPI CS signal was deactivated after each byte.

Q1. When I use ECSPI on i.MX6, Is it official usage that I use CS pin setting to GPIO not SPI SS?

Q2. When I used ECSPI4 setting CS pin to GPIO, I tried to communication to slave device on SPI with DMAC, I got I/O error at RX DMA. If I want to use SPI with DMA, then should I not set CS pin to GPIO?

Q3. Does i.MX6 have any difference between ECSPI3 and ECSPI4?

Q4. When I use ECSPI in i.MX6, then should I patch to my source code with this post “native cs and gpio cs in spi - imx6 “?

   I think, if I use ECSPI with burst mode, then I must patch it.

Best Regards,

[igorpadykov · Accepted solution]

Hi mas

1. right

2. it does not matter gpio or ss

3. no difference

4. yes if using native cs

Best regards
igor
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