DFU SDK13 buttonless - DfuTarg appears for few seconds

[Mikhail]

I enter to bootloader via my app by UART command:

err_code = sd_power_gpregret_clr(0, 0xffffffff);
APP_ERROR_CHECK(err_code);
            
err_code = sd_power_gpregret_set(0, 0xB1);
APP_ERROR_CHECK(err_code);

sd_nvic_SystemReset();

After that I see DfuTarg. But after about 1 second, advertising disappear. I need again send UART command for advertise.

I suppose, this problem in the bootloader_secure_ble, which I use. How to repare it?

nordic_debug2.txt

[Mikhail]

I added file into first post. This log after send to UART command.

[Mikhail]

Hi! Did you looked my log? Could You help me to decide this step with bootloader?

[Mikhail]

What can I see from debug info: after start normal app, I transfer to boot mode. INFO:Inside main After that bootloader start and last line: 0> :DEBUG:After SOFTDEVICE_HANDLER_APPSH_INIT Next, for unknown reason bootloader restarted and transfer manage to main app with 0> :DEBUG:Running nrf_bootloader_app_start with address: 0x0001f000

[Rune Holmgren]

Hi Mikhail,

I had a look at this together with Ketil. It looks like your system is being reset shortly after it starts advertising. This typically means that an error has occurred somewhere and the "APP_ERROR_CHECK" will then call "app_error_handler_bare" which by default resets the system. You need to figure out which error is causing the reset and resolve the cause of the error. I would recommend altering the error handler function so that it doesn't reset but rather loop indefinitely. That way you can do logging in the error handler. Further, you need to find the error check which failed. I typically use a debugger and set breakpoints to see which one is actually failing.

(When the issue has been resolved, put back the reset in the error handler. It's there as a recovery mechanism for end-user products.)

If you send me the files you have altered in the bootloader I might be able to reproduce the issue and tell you how to resolve it.

Best regards, Rune Holmgren

[Mikhail]

Hi! Thanks.

with commented and add debug code same result like attached log:

void app_error_handler_bare(uint32_t error_code)
{
NRF_LOG_INFO("Az_app_error: 0x%08x!\r\n", error_code); // ###del

(void)error_code;
NRF_LOG_ERROR("Received an error: 0x%08x!\r\n", error_code);
//    NVIC_SystemReset();

}

If from main app I send reboot comand and if I have or button pressed or NRF_POWER->GPREGRET == BOOTLOADER_DFU_START I have 2 times restart. But If I still press button, I read again it and than bootloader works fine. Is it no normal behavior.

project downloaded here

I just changed cristall settings to RC