Is there a Library connect MicroSDHC via SPI

[nRF52_DK_usr]

Hi,

i want/need to connect & access a microSD Card (32GB) on an breakout board via SPI (technical reasons) and want to use the suggested PINS (28-31) as in the intermediate lesson 5 exercise 1.

Is there a separate library (except the described spi, gios, devicetree) available/required, like an SD.h?

Thanks for hints/suggestions

[Kazi Afroza Sultana]

Hello,

Try to set SPI max frequency 400 kHz

spi-max-frequency = <400000>;

The overlay file based on your overlay be like this:

&spi1 {
    compatible = "nordic,nrf-spim";   /* enable SPIM driver */
    status = "okay";
    pinctrl-0 = <&spi1_default>;
    pinctrl-1 = <&spi1_sleep>;
    pinctrl-names = "default", "sleep";
    cs-gpios = <&gpio0 31 GPIO_ACTIVE_LOW>;

    sdhc0: sdhc@0 {
        compatible = "zephyr,sdhc-spi-slot";
        reg = <0>;
        status = "okay";
        spi-max-frequency = <400000>; /* start low */

        mmc {
            compatible = "zephyr,sdmmc-disk";
            status = "okay";
            disk-name = "MMC SD";
        };
    };
};