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nRF9161 DK SPI Flash example

nrao32

I'm looking for a beginner's guide to setting up external flash on the nRF9161 DK. I saw nRF Cloud Multi-service as an example, but its docs did not explain what was needed hardware-wise to set up the external flash memory (I found this). Basically, I have a spare Adafruit SPI Flash SD Card XTSD 4GB, and I'm looking to connect it to the DK if possible. I assume I need to modify the board overlay but I'm not sure where to go from here. Where are the pins for gd25wb256 in the sample defined? 

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    It is taking some time to port this sample to nrf9161, but interfacing the SD card with SPI works now. You can add the overlay to the sample and build with prj_blk.conf

    &spi3 {
    gd25wb256: gd25wb256e3ir@1 {
        status = "disabled";
    };
    sdhc0: sdhc@0 {
            compatible = "zephyr,sdhc-spi-slot";
            reg = <0>;
            status = "okay";
            mmc {
                compatible = "zephyr,sdmmc-disk";
                status = "okay";
            };
            spi-max-frequency = <1000000>;
    };
};

    then use the arduino pins for SPI. You can just ask if you need more help after this. I will let you know when I'm done with the sample.

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  • 0

    It is taking some time to port this sample to nrf9161, but interfacing the SD card with SPI works now. You can add the overlay to the sample and build with prj_blk.conf

    &spi3 {
    gd25wb256: gd25wb256e3ir@1 {
        status = "disabled";
    };
    sdhc0: sdhc@0 {
            compatible = "zephyr,sdhc-spi-slot";
            reg = <0>;
            status = "okay";
            mmc {
                compatible = "zephyr,sdmmc-disk";
                status = "okay";
            };
            spi-max-frequency = <1000000>;
    };
};

    then use the arduino pins for SPI. You can just ask if you need more help after this. I will let you know when I'm done with the sample.

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