how to configure VDD or GPIO voltage to 3.3V in nRF52833-DK

[shadab]

In my board nRF52833,output voltage level is by default 3.0V but I want to change it 3.3.

I used UICR Registers via below code but i wasnt change

 

#include <stdio.h>
#include <stdlib.h>
#include <nrf.h>
#include "nrf_gpio.h"
#include "nrf_timer.h"


void gpio_output_voltage_setup(void);


void main(void) {
  

  SystemInit();
  gpio_output_voltage_setup();

  while (1) {
    __WFI(); //wait for interrupt
  } 


}

void gpio_output_voltage_setup(void)
{
    // Configure UICR_REGOUT0 register only if it is set to default value.
    if ((NRF_UICR->REGOUT0 & UICR_REGOUT0_VOUT_Msk) != (UICR_REGOUT0_VOUT_3V3 << UICR_REGOUT0_VOUT_Pos))
    {
        NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen;
        while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}
        

        NRF_UICR->REGOUT0 = (NRF_UICR->REGOUT0 & ~((uint32_t)UICR_REGOUT0_VOUT_Msk)) | (UICR_REGOUT0_VOUT_3V3 << UICR_REGOUT0_VOUT_Pos);

        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();
        NRF_UICR->REGOUT0
    }
}

[Simonr]

Hi

This is on an nRF52833 Development Kit, correct (I assume so from the tags in this ticket)? If the DK is powered by the J2 USB port (Interface MCU USB port), the power supply is regulated to 3.0V by an on-board regulator, and the chip is then powered in normal voltage mode. If you want to control the REGOUT0 voltage, you need to power the board from nRF_USB port, or external supply.

Best regards,

Simon