/*
 * 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 */
}