NCS zephyr How to change VDD to 3.3v

[yoyou]

Hello,

NCS1.99, nRF5340, VsCode, Windows10,

i konw SDK17.2 change vdd voltage,

but NCS zephyr How to change VDD to 3.3v?

        

Best regards

[SwRa]

Hello,

You will need to set the value of VREGHOUT to 5 to set Vdd to 3.3V: https://infocenter.nordicsemi.com/topic/ps_nrf5340/chapters/uicr/doc/uicr.html?cp=3_0_0_4_3_2_0_1#register.VREGHVOUT

Best Regards,

Swathy

[yoyou]

Hi

thanks for reply,

i have never operated on registers,

is this as follow?

void gpio_output_voltage_3v3()
{
	if (NRF_UICR->VREGHVOUT != 5)
	{
		NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen;
		while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}

		NRF_UICR->VREGHVOUT = 5;

		NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren;
		while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}

		// System reset is needed to update UICR registers.
		NVIC_SystemReset();
	}
}

   

Best regards