Application Version from Bootloader Unavailable through recommended approach

[snoopy20]

Hi,

The DFU process is working correctly and I've tried downgrading the app version which throws the expected error, so it is stored someplace

Accessing via the recommended:

static nrf_dfu_settings_t *p_dfu_settings = (nrf_dfu_settings_t *) FLASH_BOOTLOADERSETTINGS_START;  // FLASH_BOOTLOADERSETTINGS_START=0x0002F000

device.firmware.version = p_dfu_settings->app_version;

Returns a value of zero.

Thanks,

Andrew

[snoopy20]

I had a look at the raw memory with

nrfjprog --memrd 0x0002F000 --n 4048 -f NRF52

And can't see the number. Has it moved into mbr settings?

[Sigurd]

snoopy20 said:

Has it moved into mbr settings?

 What SDK version are you using ? It was moved into MBR in SDK 15.3, but back to UICR in SDK 16

[snoopy20]

nRF5SDK160098a08e2

I thought UICR was to be thought as of a one time flash, but a updating software version held in it? Anyhow, it's not there but it is being saved, somewhere...

[Sigurd]

What app_version did you set when you generated the DFU package with nrfutil?

You can try to read it from your application code like this:

     nrf_dfu_settings_t my_dfu_settings;
     memcpy(&my_dfu_settings, (uint32_t *)BOOTLOADER_SETTINGS_ADDRESS, sizeof(nrf_dfu_settings_t)); 

     uint32_t my_app_version = my_dfu_settings.app_version;

[snoopy20]

Can't recall, something like 3010001. It is working though as it errored on an attempt to downgrade.

I'm using the same code as that already, it reports as zero. Plus I read using nrfjprog and it shows as zero.

static nrf_dfu_settings_t *p_dfu_settings = (nrf_dfu_settings_t *) FLASH_BOOTLOADERSETTINGS_START;

device.firmware.version = p_dfu_settings->app_version;

[Sigurd]

snoopy20 said:

I had a look at the raw memory with

nrfjprog --memrd 0x0002F000 --n 4048 -f NRF52

And can't see the number.

Was it all 0xFFFFFFFF, or was it only the app_version you didn't see ?

What's the content at address 0x00000FFC ?

Have you been using SDK 16.0 all time, or did you update to SDK 16.0 recently ?