AWR2944: SPI wrong clks when run at high speed

Ken Zhang

Part Number: AWR2944

Hi Experts

My customer is referring to C:\ti\mmwave_mcuplus_sdk_04_04_01_02\mcu_plus_sdk_awr294x_09_00_00_15\examples\drivers\mcan\mcan_external_loopback_interrupt\awr294x-evm\r5fss0-0_freertos\ti-arm-clang demo to configure MCAN PHY via SPI bus.

When they run this demo on EVM, the SPI signal is as below, which looks good.

However when they increase the SPI speed from 600KHz to 2MHz.

They observe some additional SPI clk period when CS is released,

Could you pls help tell why the clk is different after SPI clk frequency is increased?

Thanks

Ken

over 1 year ago

0 Ajay Narayan over 1 year ago

TI__Mastermind 22875 points

Hi Ken,

Let us try to reproduce this and get back to you.

Regards,

Ajay

0 Saswat Kumar over 1 year ago in reply to Ajay Narayan

TI__Mastermind 36455 points

Hello Ken,

Can you try this solution out as well once: (+) AWR2944: SPI configuration for PMIC LP87745 sequence - Sensors - INTERNAL forum - Sensors - INTERNAL - TI E2E support forums

Regards,
Saswat Kumar

0 Ken Zhang over 1 year ago in reply to Saswat Kumar

TI__Expert 3495 points

Hi Saswat

After enabling SPI EDMA, It is still the same.

Thanks

Ken

+1 Saswat Kumar over 1 year ago in reply to Ken Zhang

TI__Mastermind 36455 points

Hello Ken,

I am attaching the updated mibspi_v0.c, which had fixed the issue for a customer a while back, it is just a sequencing issue as I remember.
Please do tell your customer to try this, this had removed the unwanted CS clock lines.
Your customer will have to modify the code according to this file, then rebuild the libraries and then rebuild the application.
This fix has been tested by me during providing the fix as well.

mibspi_v0_hotfix.c

Regards,
Saswat Kumar

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AWR2944: SPI wrong clks when run at high speed