How to correctly re-start the SD Card interface (SPI)

RE: How to correctly re-start the SD Card interface (SPI)

Albert_0 — Fri, 13 Dec 2024 01:39:24 GMT

Hi Julio,

I went the lazy way and just reset and restart the board. Basically:

- If the board has a BLE connection it logs data onto the SD Card.

- If the board loses BLE connection while logging, everything still works

- If data logging is turned off and BLE is connected, all peripherals are running waiting to re-start logging

- If no logging or BLE connection is present, the board does a complete reset after 1 minute and waits for a new BLE connection.

Not very elegant, but it works for us, and once the BLE connection is off and no logging is happening the board does consume very little after the reset.

Sorry I could not be of more help.

Cheers,

Alberto

RE: How to correctly re-start the SD Card interface (SPI)

Juls — Thu, 12 Dec 2024 15:49:51 GMT

Hello Alberto, I would like to know if it was possible for you to make it work?. I need to do the same process but I can't find how to reset the SD without restarting the complete board.
If you have information I would appreciate it very much.

Regards,
Julio.

RE: How to correctly re-start the SD Card interface (SPI)

Albert_0 — Tue, 07 May 2024 07:56:41 GMT

Hi Kenneth, thanks for your answer.

I will try both solutions in the next few days, from what I read it seems there isn't a more elegant way in Zephyr to restart the SD card SPI interface from scratch during runtime.

Unfortunately I'm quite new to Zephyr, so trying to follow what happens between the firmware and the hardware is still a challenge for me.

I will let you know how it goes.

Cheers,

Alberto

RE: How to correctly re-start the SD Card interface (SPI)

Kenneth — Mon, 06 May 2024 11:40:05 GMT

Hello,

Normally you use the power management api to put a device into suspend/resume state:
https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/test_and_optimize/optimizing/power_general.html#put_the_external_flash_into_sleep_mode_in_inactivity_periods

If that does not achieve what you want, I can find someone did a "hack" here:
https://devzone.nordicsemi.com/f/nordic-q-a/91157/optimizing-power-of-sd-card-problem

Kenneth