how to get a correct flash partition id ?

Question

SDK : NCS v2.8.0

SoC : nRF52840

HW : custom board

Hello,

I was trying to use settings subsystem, and I managed to make setting_write() and settings_read() work. Now, I am trying to clear a settings with following code, but have gotten errors:

void settings_clear() {

const struct flash_area *fa;

int err;

err = flash_area_open(DT_NODELABEL(settings_partition), &fa);

if (err) {

printk("Failed to open settings storage: %d\n", err);

return;

}

err = flash_area_erase(fa, 0, fa->fa_size);

if (err) {

printk("Failed to erase settings storage: %d\n", err);

} else {

printk("Settings storage erased!\n");

}

flash_area_close(fa);

}

When I tried this code, I got following errors:

D:/ncs/xcam5/build/xcam5/zephyr/include/generated/zephyr/devicetree_generated.h:10178:43: error: 'DT_N_S_soc_S_flash_controller_4001e000_S_flash_0_S_partitions_S_partition_f8000' undeclared (first use in this function); did you mean 'DT_N_S_soc_S_flash_controller_4001e000_S_flash_0_S_partitions_S_partition_f8000_ORD'?
10178 | #define DT_N_NODELABEL_settings_partition DT_N_S_soc_S_flash_controller_4001e000_S_flash_0_S_partitions_S_partition_f8000
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
D:/ncs/xcam5/build/xcam5/zephyr/include/generated/zephyr/devicetree_generated.h:10178:43: note: in definition of macro 'DT_N_NODELABEL_settings_partition'
10178 | #define DT_N_NODELABEL_settings_partition DT_N_S_soc_S_flash_controller_4001e000_S_flash_0_S_partitions_S_partition_f8000
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
C:/DevTools/nRF/ncs/v2.8.0/zephyr/include/zephyr/devicetree.h:200:29: note: in expansion of macro 'DT_CAT'
200 | #define DT_NODELABEL(label) DT_CAT(DT_N_NODELABEL_, label)
| ^~~~~~
D:/ncs/xcam5/src/main.c:168:31: note: in expansion of macro 'DT_NODELABEL'
168 | err = flash_area_open(DT_NODELABEL(settings_partition), &fa);
| ^~~~~~~~~~~~

My board.dts file:

&flash0 {

partitions {
compatible = "fixed-partitions";
#address-cells = <1>;
#size-cells = <1>;

boot_partition: partition@0 {
label = "mcuboot";
reg = <0x00000000 DT_SIZE_K(48)>;
};

slot0_partition: partition@c000 {
label = "image-0";
reg = <0x0000c000 DT_SIZE_K(472)>;
};

slot1_partition: partition@82000 {
label = "image-1";
reg = <0x00082000 DT_SIZE_K(472)>;
};

settings_partition: partition@f8000 {
label = "settings";
reg = <0x000F8000 DT_SIZE_K(16)>;
};

storage_partition: partition@fc000 {
label = "storage";
reg = <0x000FC000 DT_SIZE_K(16)>;
};
};

my proj.conf file has:

CONFIG_SETTINGS=y
CONFIG_SETTINGS_NVS=y
CONFIG_NVS=y
CONFIG_FLASH_MAP=y

Question:

How can I get the correct "settings_partition" ID, which is to be used in flash_area_open() function?

Thanks,

Robin