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circuitpython/ports/nrf/peripherals/nrf/nrf52833/power.c

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2.3 KiB

/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2018 Dan Halbert for Adafruit Industries
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "nrfx.h"
#include "hal/nrf_nvmc.h"
void nrf_peripherals_power_init(void) {
// Set GPIO reference voltage to 3.3V if it isn't already. REGOUT0 will get reset to 0xfffffff
// if flash is erased, which sets the default to 1.8V
// This matters only when "high voltage mode" is enabled, which is true on the PCA10059,
// and might be true on other boards.
if (NRF_UICR->REGOUT0 == 0xffffffff && NRF_POWER->MAINREGSTATUS & 1) {
// Expand what nrf_nvmc_word_write() did.
// It's missing from nrfx V2.0.0, and nrfx_nvmc_word_write() does bounds
// checking which prevents writes to UICR.
// Reported: https://devzone.nordicsemi.com/f/nordic-q-a/57243/nrfx_nvmc-h-api-cannot-write-to-uicr
NRF_NVMC->CONFIG = NRF_NVMC_MODE_WRITE;
while (!(NRF_NVMC->READY & NVMC_READY_READY_Msk)) {}
NRF_UICR->REGOUT0 = UICR_REGOUT0_VOUT_3V3 << UICR_REGOUT0_VOUT_Pos;
__DMB();
while (NRF_NVMC->READY == NVMC_READY_READY_Busy) {}
NRF_NVMC->CONFIG = NRF_NVMC_MODE_READONLY;
// Must reset to enable change.
NVIC_SystemReset();
}
}