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IMX8MP ECSPI3 MISO Problem

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IMX8MP ECSPI3 MISO Problem

‎09-22-2021 01:27 AM
658 Views
AlfTeleco
Contributor III

Hello, 

 

We are having some problems using ECSPI3 at an imx8mp custom board. 

Mosi, SCLK and CS seems to be working okay, but MISO is no even working in loopback mode. 

 

Any idea? Is there any kernel problem or special configuration at dts? 

 

Thanks a lot!

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‎09-22-2021 06:51 AM
629 Views
AlfTeleco
Contributor III

Hi Igor and thanks for the quick answer. 

We are using imx kernel 5.4.70. The problem seems to be related to CS signal. CS seems to be going inactive between writes and reads, maybe making the slave become unavailable. The problem is shown in this picture: 

 

Captura de pantalla de 2021-09-22 15-45-40.png

 

Any idea will be much appreciated, thank you 

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‎09-22-2021 03:29 AM
645 Views
igorpadykov
NXP Employee
NXP Employee

Hi Alvaro

 

what bsp used in the case. May be recommended to try latest Linux 5.10.35_2.0.0

https://source.codeaurora.org/external/imx/linux-imx/tree/?h=lf-5.10.y

with unit test

https://source.codeaurora.org/external/imx/imx-test/tree/test/mxc_spi_test?h=lf-5.10.y_2.0.0

 

Best regards
igor

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