cpu.c
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/*
* Copyright (C) 2016 Leon George
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup cpu_cc26x0
* @{
*
* @file
* @brief implementation of the CPU initialization
*
* @author Leon M. George <leon@georgemail.eu>
* @}
*/
#include "cpu.h"
#include "periph_conf.h"
#ifndef HF_CLOCK_SOURCE
#define HF_CLOCK_SOURCE DDI_0_OSC_CTL0_SCLK_HF_SRC_SEL_RCOSC /* set 48MHz RCOSC */
#endif
#ifndef LF_CLOCK_SOURCE
#define LF_CLOCK_SOURCE DDI_0_OSC_CTL0_SCLK_LF_SRC_SEL_HF_RCOSC /* set 31.25kHz derived from 48MHz RCOSC */
#endif
/**
*@brief Configure the MCU system clock
*/
static void cpu_clock_init(void);
/**
* @brief Initialize the CPU, set IRQ priorities
*/
void cpu_init(void)
{
/* initialize the Cortex-M core */
cortexm_init();
/* initialize the system clock */
cpu_clock_init();
}
static void cpu_clock_init(void)
{
AON_WUC->AUXCTL |= AUXCTL_AUX_FORCE_ON; /* power on AUX_PD */
while(!(AON_WUC->PWRSTAT & PWRSTAT_AUX_PD_ON)); /* wait for AUX_PD to be powered on */
AUX_WUC->MODCLKEN0 |= MODCLKEN0_AUX_DDI0_OSC_EN; /* turn on oscillator interface clock */
DDI_0_OSC->CTL0 |= HF_CLOCK_SOURCE | LF_CLOCK_SOURCE; /* configure HF and LF clocks */
}