97 lines
3.2 KiB
C
97 lines
3.2 KiB
C
/*
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Copyright (C) 2016 Stephane D'Alu
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file NRF5/NRF52832/hal_lld.c
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* @brief NRF52832 HAL Driver subsystem low level driver source.
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*
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* @addtogroup HAL
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* @{
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*/
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#include "hal.h"
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/*===========================================================================*/
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/* Driver local definitions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local variables and types. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief Low level HAL driver initialization.
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*
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* @notapi
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*/
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void hal_lld_init(void)
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{
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/* High frequency clock initialization
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*/
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NRF_CLOCK->TASKS_HFCLKSTOP = 1;
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#if !defined(NRF5_XTAL_VALUE) && (NRF5_XTAL_VALUE != 32000000)
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#error "A 32Mhz crystal is mandatory on nRF52 boards."
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#endif
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#if (NRF5_HFCLK_SOURCE == CLOCK_HFCLKSTAT_SRC_Xtal)
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NRF_CLOCK->EVENTS_HFCLKSTARTED = 0;
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NRF_CLOCK->TASKS_HFCLKSTART = 1;
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while (NRF_CLOCK->EVENTS_HFCLKSTARTED == 0);
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#endif
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/* Low frequency clock initialization
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*/
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#if (OSAL_ST_MODE != OSAL_ST_MODE_NONE)
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#if (NRF5_ST_USE_RTC0 || NRF5_ST_USE_RTC1) && \
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(NRF5_LFCLK_SOURCE == CLOCK_LFCLKSTAT_SRC_RC)
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#error "A NRF5_SYSTEM_TICKS_AS_RTC requires LFCLK clock to be started."
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#endif
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#endif
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NRF_CLOCK->TASKS_LFCLKSTOP = 1;
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#if (NRF5_LFCLK_SOURCE != CLOCK_LFCLKSTAT_SRC_RC)
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NRF_CLOCK->LFCLKSRC = NRF5_LFCLK_SOURCE;
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NRF_CLOCK->EVENTS_LFCLKSTARTED = 0;
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NRF_CLOCK->TASKS_LFCLKSTART = 1;
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while (NRF_CLOCK->EVENTS_LFCLKSTARTED == 0);
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#endif
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irqInit();
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}
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/**
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* @}
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*/
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