Davide Urbano

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6 years, 7 months ago.

How can I get a library for a SD card reader ?

Hi to all, I'm working on NUCLEO-L073RZ Board with a digital accelerometer (ADXL355) linked by SPI bus; now I'm wondering if it is possible to save the accelerometer data on a SD card, so I'd like to know how can I get a library for interfacing the reader. Please, could anyone help me ? regards

3 Answers

Bill Bellis
6 years, 7 months ago.

Good working example is under this author's directory https://os.mbed.com/users/neilt6/code/ The one you need is called SDFileSystem_HelloWorld

Accepted Answer
Sarah Marsh
6 years, 7 months ago.

Use mbed OS. It has built in filesystem APIs. I'd start here for documentation - https://docs.mbed.com/docs/mbed-os-api-reference/en/latest/APIs/storage/storage_index/

Christopher Haster
6 years, 7 months ago.

This is the specific library for SD cards if it helps: https://github.com/armmbed/sd-driver

Here's a quick example (assuming you have formatted the sd card, you should be able to format FAT on your computer):

SDBlockDevice sd(spi, pins, go, here);
FATFileSystem fs("fs");

int main() {
    sd.init();
    fs.mount(&sd);

    FILE* fd = fopen("/fs/hi.txt", "w");
    fprintf(fd, "hello!");
    fclose(fd);

    sd.deinit();
    fs.unmount();
}

Here's a full example with all of the error handling (you will need to change the block device to SDBlockDevice): https://github.com/ARMmbed/mbed-os-example-fat-filesystem