WL1837MOD: access to ID register (or similar) for SDIO/UART interface test?

JasonT

Part Number: WL1837MOD

Hi,

Does the WL1837MOD have a device ID or some other identifying information that I can access over the SDIO and UART ports in order to test these interfaces prior to running the full software stack?

Thanks - Jason

over 5 years ago

0 S over 5 years ago

TI__Mastermind 35795 points

Jason,

I am assuming you are running Linux . If yes, you may rely on WiLink8 SDIO driver and MMC/SDIO stack to detect the SoC.

If properly detected , you should see message similar to following during boot up"

"mmc1: new high speed SDIO card at address 0001"

Regards

Saurabh

0 JasonT over 5 years ago in reply to S

Intellectual 280 points

Currently our Linux boot hangs with no information about what is not working (it booted fine before we added support for this device). Therefore I would like to be able to debug the HW interface using simple reads and writes.

Thanks - Jason

0 S over 5 years ago in reply to JasonT

TI__Mastermind 35795 points

Jason ,

I don't believe we have a document detailing WiLink8 SoC registers and expected values. As a first step you will need to ensure that the SoC is powering up ok. Pls refer to power up sequence in the datasheet : https://www.ti.com/lit/ds/symlink/wl1837mod.pdf

Also , you may use RTTT tool on Windows PC to test WLAN IP on the SoC using RS-232 interface :https://www.ti.com/lit/ds/symlink/wl1837mod.pdf

Regards

Saurabh

0 JasonT over 5 years ago in reply to S

Intellectual 280 points

Thank you. I have decided that I should be able to monitor the SD CMD/CLK /DATA lines during Linux boot in order to determine if the HW interface is operating properly. So far it looks like the expected CMD sequence and tuning occur, so we are looking closer into whether the OS image has all the necessary ingredients.

Regards - Jason

0 JasonT over 5 years ago in reply to JasonT

Intellectual 280 points

Just wanted to update this item to say that we are now seeing the mmc detected message at boot. My issue was that the SDIO feedback clock used by the SD controller was not being generated correctly.

Thanks - Jason

0 S over 5 years ago in reply to JasonT

TI__Mastermind 35795 points

Jason,

Thank you for the update.

We wish you all the best with your project

Saurabh

Wi-Fi

Wi-Fi forum

WL1837MOD: access to ID register (or similar) for SDIO/UART interface test?