Zephyr fatfs example fails with SD card

Question

Hi,

I'm trying to reproduce the fatfs example on a nrf52840 DK and Sandisk micro SD card that's plugged into a Sparkfun Transflash breakout board. I can't seem to mount the micro SD card in the sample example (I've confirmed that the micro SD card is formatted correctly). I've tried this on NCS v2.0.0 and v2.1.0

Here is the overlay I'm using:

```

&spi1 {

status = "okay";

cs-gpios = <&gpio1 17 GPIO_ACTIVE_HIGH>;

sdhc0: sdhc@0 {

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

reg = <0>;

status = "okay";

label = "SDHC0";

spi-max-frequency = <1000000>;

};

```

and here is the prj.conf:

````

CONFIG_DISK_DRIVER_SDMMC=y

CONFIG_SPI=y

CONFIG_DISK_ACCESS=y

CONFIG_LOG=y

CONFIG_FILE_SYSTEM=y

CONFIG_FAT_FILESYSTEM_ELM=y

CONFIG_PRINTK=y

CONFIG_MAIN_STACK_SIZE=2048

```

Can you advise?

Simonr · Accepted Answer

Hi 
 Have you configured these pins as well in your application Please note that P0.30 and P0.31 are recommended to only use in standard drive, low frequency I/O only and are likely to affect the radio performance if run at high frequencies. You can check out this ticket where my colleague explains in detail how to set up a fat_fs project and has uploaded a project as well. 
 Best regards, 
 Simon

Zephyr fatfs example fails with SD card

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