NRF Connect SDK - Change regulator LDO configuration

[thiago_hd]

How can I change the regulator configuration (specially the LDO voltage output) in runtime, and also, how could I do it in compilation time?

PS: I use mcuboot as well.

[SwRa]

Hi Thiago,

You can change the output voltage levels by setting REGOUT0 accordingly: infocenter.nordicsemi.com/.../uicr.html

Best Regards,

Swathy

[thiago_hd]

I have done it in runtime, but it does not work, and I actually don't know why.

void main(void){
	NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos;
	
	while (NRF_NVMC->READY == NVMC_READY_READY_Busy){
	}
	
	NRF_UICR->REGOUT0 = UICR_REGOUT0_VOUT_3V0;

	NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos;
}

[SwRa]

HI Thiago,

You will need to set the voltage using nrfjprog.. There is no function that writes to this section of uicr from the cpu itself.. You can take a look at this thread:  Using nRF5340-PDK at 3.3V instead of 1.8V 

Regards,

Swathy

[thiago_hd]

The code actually worked. After a full erase of the chip it worked.