| /* |
| * Copyright (c) 2018 Nordic Semiconductor ASA. |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #include <zephyr/init.h> |
| #include <hal/nrf_power.h> |
| |
| void board_early_init_hook(void) |
| { |
| /* If the nrf52840dongle/nrf52840 board target is powered from USB |
| * (high voltage mode), GPIO output voltage is set to 1.8 volts by |
| * default and that is not enough to turn the green and blue LEDs on. |
| * Increase GPIO voltage to 3.0 volts. |
| */ |
| if ((nrf_power_mainregstatus_get(NRF_POWER) == |
| NRF_POWER_MAINREGSTATUS_HIGH) && |
| ((NRF_UICR->REGOUT0 & UICR_REGOUT0_VOUT_Msk) == |
| (UICR_REGOUT0_VOUT_DEFAULT << UICR_REGOUT0_VOUT_Pos))) { |
| |
| NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos; |
| while (NRF_NVMC->READY == NVMC_READY_READY_Busy) { |
| ; |
| } |
| |
| NRF_UICR->REGOUT0 = |
| (NRF_UICR->REGOUT0 & ~((uint32_t)UICR_REGOUT0_VOUT_Msk)) | |
| (UICR_REGOUT0_VOUT_3V0 << UICR_REGOUT0_VOUT_Pos); |
| |
| NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos; |
| while (NRF_NVMC->READY == NVMC_READY_READY_Busy) { |
| ; |
| } |
| |
| /* a reset is required for changes to take effect */ |
| NVIC_SystemReset(); |
| } |
| } |
