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43 lines
1.0 KiB
C
43 lines
1.0 KiB
C
/*
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* Copyright (C) 2014 Freie Universität Berlin
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*
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* This file is subject to the terms and conditions of the GNU Lesser General
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* Public License v2.1. See the file LICENSE in the top level directory for more
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* details.
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*/
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/**
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* @ingroup cpu_nrf51822
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* @{
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*
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* @file
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* @brief Implementation of the CPU initialization
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*
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* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
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* @}
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*/
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#include "cpu.h"
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#include "periph_conf.h"
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/**
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* @brief Initialize the CPU, set IRQ priorities
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*/
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void cpu_init(void)
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{
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/* initialize the Cortex-M core */
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cortexm_init();
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/* set the correct clock source for HFCLK */
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#if CLOCK_CRYSTAL == 32
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NRF_CLOCK->XTALFREQ = CLOCK_XTALFREQ_XTALFREQ_32MHz;
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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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#elif CLOCK_CRYSTAL == 16
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NRF_CLOCK->XTALFREQ = CLOCK_XTALFREQ_XTALFREQ_16MHz;
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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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}
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