NRF52832 does not start after power on

[carllee]

Dear all,

1) I flash the code through the debugger to my pcb and it is running correctly (just on/off some LEDs).

2) I remove the JTAG+SWD connector, the project still works as expected.

3) I reset it and the system starts working normally. This can be repeated again and again.

4) BUT now I disconnect 3.3 Vcc. Reconnect 3.3V and the application is failed to start. I also try the reset pin, and the application is not running.

5) I use the LDO, i have read through the answer here that by adding a line "CONFIG_BOARD_ENABLE_DCDC=n" to the "prj.conf" file.

    But the word "CONFIG_BOARD_ENABLE_DCDC" is not recognized.

I use the visual studio code as an IDE. 

SDK: nRF Connect SDK v3.0.0

Toolchain v3.0.1

 

Can anyone help about how to disable the DCDC function?

Thanks,

Regards,

Carl

[Turbo J]

DCDC is no longer a config option, you must have found old code/documentation. Its now handled in the device tree.

Put somehing like this in your overlay:

&reg {
	regulator-initial-mode = <NRF5X_REG_MODE_LDO>;
};