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https://github.com/RIOT-OS/RIOT.git
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59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
/*
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* Copyright (C) 2016 Leon George
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup cpu_cc26x0
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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 Leon M. George <leon@georgemail.eu>
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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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#include "periph/init.h"
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#ifndef HF_CLOCK_SOURCE
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#define HF_CLOCK_SOURCE DDI_0_OSC_CTL0_SCLK_HF_SRC_SEL_RCOSC /* set 48MHz RCOSC */
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#endif
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#ifndef LF_CLOCK_SOURCE
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#define LF_CLOCK_SOURCE DDI_0_OSC_CTL0_SCLK_LF_SRC_SEL_HF_RCOSC /* set 31.25kHz derived from 48MHz RCOSC */
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#endif
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/**
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*@brief Configure the MCU system clock
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*/
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static void cpu_clock_init(void);
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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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/* initialize the system clock */
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cpu_clock_init();
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/* trigger static peripheral initialization */
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periph_init();
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}
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static void cpu_clock_init(void)
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{
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AON_WUC->AUXCTL |= AUXCTL_AUX_FORCE_ON; /* power on AUX_PD */
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while(!(AON_WUC->PWRSTAT & PWRSTAT_AUX_PD_ON)); /* wait for AUX_PD to be powered on */
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AUX_WUC->MODCLKEN0 |= MODCLKEN0_AUX_DDI0_OSC_EN; /* turn on oscillator interface clock */
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DDI_0_OSC->CTL0 |= HF_CLOCK_SOURCE | LF_CLOCK_SOURCE; /* configure HF and LF clocks */
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}
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