NRF9160dk storing to and reading from flash

Question

What is the best/easiest way to store a struct or string to flash persistently? I see other boards using FDS and other tools but those don't appear to be available on this board. Are there any examples that write and read to and from flash? I see DT_FLASH_AREA_6_DEV_LABEL=STORAGE so I assume I'm going to want to use that section of flash for my needs? 
 
 Any guidance would be much appreciated!

Jace · Accepted Answer

I was able to figure it out. Zephyr has a library called NVS.

In my prj.conf I added:

CONFIG_FLASH=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_NVS=y

and then my code looks like this:

#include <nvs/nvs.h>
#include <device.h>
#include <flash.h>


{

static struct nvs_fs fs;

struct flash_pages_info info;
fs.offset = DT_FLASH_AREA_STORAGE_OFFSET;
err = flash_get_page_info_by_offs(device_get_binding(DT_FLASH_DEV_NAME),
    fs.offset, &info);
if (err) {
    printk("Unable to get page info");
}
fs.sector_size = info.size;
fs.sector_count = 3U;
err = nvs_init(&fs, DT_FLASH_DEV_NAME);
if (err) {
    printk("Flash Init failed\n");
}

char wbuf[16];
char rbuf[16];
strcpy(wbuf, "Hello");
nvs_write(&fs, DT_FLASH_AREA_STORAGE_OFFSET, &wbuf, strlen(wbuf)+1);
err = nvs_read(&fs, DT_FLASH_AREA_STORAGE_OFFSET, &rbuf, sizeof(rbuf));
printk("%s", rbuf);

}

NRF9160dk storing to and reading from flash

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