force enter the dfu with command

[yu1998]

is there any command to forcethe app to enter the dfu mode

i do know the dfu buttonless but this time i want it to use it on uart dfu

[Vidar Berg]

Hello,

Yes, you can force it to enter DFU mode by writing the BOOTLOADER_DFU_START flag to GPREGRET0 followed by a system reset similiar to how it's done in the ble buttonless template example.

Example

void enter_dfu_mode (void)
{
    uint32_t err_code = sd_power_gpregret_clr(0, 0xffffffff);
    APP_ERROR_CHECK(err_code);

    err_code = sd_power_gpregret_set(0, BOOTLOADER_DFU_START);
    APP_ERROR_CHECK(err_code);
    
    NVIC_SystemReset();
}

[yu1998]

I know this but my question is using a command to force enter dfu mode

and i found a way to do this

but this is a one way force in the dfu mode

basically i just erase the setting.hex section to make the board caanot enter the app mode

this is a way to force enter the dfu mode although it is a one way method

use in urgent time

@ECHO ON
 nrfjprog --family nrf52 --erasepage 0xFE000-0xFF001
@ECHO ON
 nrfjprog --family nrf52 --memrd 0xFF000
@ECHO ON
 nrfjprog --family nrf52 --memwr 0xFF000 --val 1
@ECHO ON
nrfjprog -f nrf52 --reset
@ECHO ON
 nrfjprog --family nrf52 --memrd 0xFF000

[Vidar Berg]

Yes, erasing the settings page is one way to do it. I did not know you had a debugger connected. I assumed you wanted to enter DFU mode after receiving a specific command over UART.