Hi Nordic,
I am using the Raytac module with the nrf52840 inside, I have set my hardware as mode of Reg0 DC/DC enabled. Which disconnected the VDD and VDDH. Also I have givrn the 3.9-4.2V to the pin VDDH. In my code I setup output voltage to be 1.8V, but still output to be 3.3V, any idea for why not 1.8V for GPIO output?
static void gpio_output_voltage_setup_1_8(void)
{
// Configure UICR_REGOUT0 register only if it is set to default value.
if ((NRF_UICR->REGOUT0 & UICR_REGOUT0_VOUT_Msk) ==
(UICR_REGOUT0_VOUT_DEFAULT << 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_1V8 << 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();
}
else
{
#ifdef DEBUG_UART_INFO_RTT_PRIVATE
NRF_LOG_INFO("not setup_1_8\n");
#endif
}
}
int main(void)
{
gpio_output_voltage_setup_1_8();
