Unable to initialize / hot swap sd card during run time

[Reshma_tomy]

Hi

I have a system which needs to be run for 10days continuously. I have and SD card to log data during this period.

I need to verify the SD card data in between, so I send data from Bluetooth to alert my system that i am going to unmount and remove my SD card and also for mounting the SD card after I insert it back to SD card slot.

The cards gets detected easily and is accessible during initialization. 

int res = fs_unmount(&mp); is the command I use for mounting and detecting the sd card.

But after hot swap the SD card card gets detected but fails to respond due to sd card read timeout error. Kindly provide any suggestion so that I can effectively swap SD cards during runtime.

below is the snippet of the overlay file.

&spi4 {

    status ="okay";

    cs-gpios = <&gpio1 11 GPIO_ACTIVE_LOW>,<&gpio1 12 GPIO_ACTIVE_LOW>;

    sdhc0: sdhc@0 {

       

        compatible = "zephyr,sdhc-spi-slot";

        reg = <0>;

        status = "okay";

        mmc {

            compatible = "zephyr,sdmmc-disk";

            status = "okay";

        };

        spi-max-frequency = < 24000000 >;

   

    };

[Reshma_tomy]

Hi Simonr 

Do you have any suggestion how to uninit SPI in zephyr?

[Simonr]

What driver are you using for SPI in your project? In I.E. the nrfx_spim/nrfx_spis drivers in the nRF Connect SDK we have dedicated uninit functions for example. You need to unmount the SD card and uninit the SPI I believe, then reinit and mount the SD card again.

Best regards,

Simon

[Reshma_tomy]

I am using only zephyr APIs, my device is SPI master, hence it will be using nrfx_spim. I haven't used these driver functions directly in my code, as I am using only zephyr device tree APIs

[Simonr]

Hi

It seems like the Zephyr API don't have a dedicated wrapper around the nrfx_spim_uninit() function, so I think you'll have to call it directly in order to uninitialize the peripheral, then reinitialize when the SD card is put back in.

Best regards,

Simon

[Reshma_tomy]

So when I reinitialize it , do I need to give the configurations again and call nrfx_spim_init() function?