What is the right way of the DFU

[attila-v]

Hi,

I'd like to update firmware on my nRF52832 panel with my update flow (only the application; the bootloader and softdevice will be unchanged). I can load the new firmware into the empty pages of the flash (ie. from 0x4C000). I set a 'nrf_dfu_settins_t' struct instance, write it back, then restart the device (see code snippet), but the new application did not load to the right place, so the original firmware will be starting. And magically, if I leave the J-Link SWD debugger on the panel, the new firmware will be started after a while (cca. 2-3 minutes).
What I missed, or made wrong way?

regards, Attila

__attribute__ ((aligned (32))) nrf_dfu_settings_t ds;

const uint32_t SETTINGADDRESS = 0x7F000;
const uint32_t UPDATE_FLASH_START = 0x4C000;
memcpy((char*)&ds, (uint32_t*)SETTINGADDRESS, sizeof(ds)); // load original values

ds.progress.update_start_address = UPDATE_FLASH_START;
ds.bank_0.bank_code = 0;
ds.bank_1.bank_code = 1;
ds.bank_1.image_size = newApplicationFileSize;
ds.bank_1.image_crc = crc32_compute((uint8_t*)ds.progress.update_start_address, newApplicationFileSize, 0);
ds.boot_validation_app.type = 1;
ds.boot_validation_crc = 0xFFFFFFFF;
ds.crc = crc32_compute((uint8_t*)(&ds) + 4, (offsetof(nrf_dfu_settings_t, init_command)) - 4, 0);

// write back this struct (to the MBR [0x7e000] area too)

uint32_t err = sd_power_gpregret_clr(0, 0xffffffff);
APP_ERROR_CHECK(err);
err = sd_power_gpregret_set(0, BOOTLOADER_DFU_START);
APP_ERROR_CHECK(err);
nrf_pwr_mgmt_shutdown(NRF_PWR_MGMT_SHUTDOWN_GOTO_DFU);

[Amanda Hsieh]

Hi, 

Which SDK are you using? 

-Amanda H.

[attila-v]

HI,

15.3

[attila-v]

My opinion is that I have to set any other members of this struct too, but I did not found any information about this.
What do you think?

[Amanda Hsieh]

Hi, 

You can debug the bootloader and place a breakpoint at nrf_bootloader_fw_activate in nrf_bootloader_init() in nrf_bootloader.c. You should see that app_activate() is being called insidenrf_bootloader_fw_activate().

-Amanda H.

[attila-v]

thank you for your answer.
When JLink SWD is connected, I can see in the log, that the update process is working correctly (i.e. in the  nrf_bootloader_fw_activate() function the case branch is the 'Valid app', so the app_activate() is called). But if I use my panel without any debug possibility, the update wont be success.
What does the JLink (or what do I miss) when it is lost its session after panel restart (I have to restart JLink quickly if I want to see the log)?