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/**
* @file system_max32660.c
* @brief System-level initialization implementation file
*/
/*******************************************************************************
* Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Except as contained in this notice, the name of Maxim Integrated
* Products, Inc. shall not be used except as stated in the Maxim Integrated
* Products, Inc. Branding Policy.
*
* The mere transfer of this software does not imply any licenses
* of trade secrets, proprietary technology, copyrights, patents,
* trademarks, maskwork rights, or any other form of intellectual
* property whatsoever. Maxim Integrated Products, Inc. retains all
* ownership rights.
*
* $Date: 2018-12-18 15:37:22 -0600 (Tue, 18 Dec 2018) $
* $Revision: 40072 $
*
******************************************************************************/
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "max32660.h"
#include "gcr_regs.h"
#include "pwrseq_regs.h"
#include "tmr_regs.h"
#include "wdt_regs.h"
#include "mxc_sys.h"
extern void (* const __isr_vector[])(void);
uint32_t SystemCoreClock = HIRC96_FREQ;
__weak void SystemCoreClockUpdate(void)
{
uint32_t base_freq, div, clk_src,ovr;
// Get the clock source and frequency
clk_src = (MXC_GCR->clkcn & MXC_F_GCR_CLKCN_CLKSEL);
if (clk_src == MXC_S_GCR_CLKCN_CLKSEL_HFXIN) {
base_freq = HFX_FREQ;
} else {
if (clk_src == MXC_S_GCR_CLKCN_CLKSEL_NANORING) {
base_freq = NANORING_FREQ;
} else {
ovr = (MXC_PWRSEQ->lp_ctrl & MXC_F_PWRSEQ_LP_CTRL_OVR);
if (ovr == MXC_S_PWRSEQ_LP_CTRL_OVR_0_9V) {
base_freq = HIRC96_FREQ/4;
} else {
if (ovr == MXC_S_PWRSEQ_LP_CTRL_OVR_1_0V) {
base_freq = HIRC96_FREQ/2;
} else {
base_freq = HIRC96_FREQ;
}
}
}
}
// Get the clock divider
div = (MXC_GCR->clkcn & MXC_F_GCR_CLKCN_PSC) >> MXC_F_GCR_CLKCN_PSC_POS;
SystemCoreClock = base_freq >> div;
}
/* This function is called before C runtime initialization and can be
* implemented by the application for early initializations. If a value other
* than '0' is returned, the C runtime initialization will be skipped.
*
* You may over-ride this function in your program by defining a custom
* PreInit(), but care should be taken to reproduce the initilization steps
* or a non-functional system may result.
*/
__weak int PreInit(void)
{
/* Do nothing */
#if defined ( __CC_ARM )
SystemInit();
#endif
return 0;
}
/* This function can be implemented by the application to initialize the board */
__weak int Board_Init(void)
{
/* Do nothing */
return 0;
}
/* This function is called just before control is transferred to main().
*
* You may over-ride this function in your program by defining a custom
* SystemInit(), but care should be taken to reproduce the initialization
* steps or a non-functional system may result.
*/
__weak void SystemInit(void)
{
/* Configure the interrupt controller to use the application vector table in */
/* the application space */
/* IAR & Keil must set vector table after all memory initialization. */
SCB->VTOR = (unsigned long)__isr_vector;
MXC_WDT0->ctrl &= ~MXC_F_WDT_CTRL_WDT_EN; /* Turn off watchdog. Application can re-enable as needed. */
/* Enable FPU on Cortex-M4, which occupies coprocessor slots 10 & 11 */
/* Grant full access, per "Table B3-24 CPACR bit assignments". */
/* DDI0403D "ARMv7-M Architecture Reference Manual" */
SCB->CPACR |= SCB_CPACR_CP10_Msk | SCB_CPACR_CP11_Msk;
__DSB();
__ISB();
/* Switch system clock to HIRC */
SYS_Clock_Select(SYS_CLOCK_HIRC, MXC_TMR0);
/* Disable clocks to peripherals by default to reduce power */
SYS_ClockDisable(SYS_PERIPH_CLOCK_DMA);
SYS_ClockDisable(SYS_PERIPH_CLOCK_SPI17Y);
SYS_ClockDisable(SYS_PERIPH_CLOCK_SPIMSS);
SYS_ClockDisable(SYS_PERIPH_CLOCK_UART0);
SYS_ClockDisable(SYS_PERIPH_CLOCK_UART1);
SYS_ClockDisable(SYS_PERIPH_CLOCK_I2C0);
SYS_ClockDisable(SYS_PERIPH_CLOCK_T0);
SYS_ClockDisable(SYS_PERIPH_CLOCK_T1);
SYS_ClockDisable(SYS_PERIPH_CLOCK_T2);
SYS_ClockDisable(SYS_PERIPH_CLOCK_I2C1);
Board_Init();
}
//#if defined ( __CC_ARM )
///* Global variable initialization does not occur until post scatterload in Keil tools.*/
///* External function called after our post scatterload function implementation. */
//extern void $Super$$__main_after_scatterload(void);
///**
// * @brief Initialization function for SystemCoreClock and Board_Init.
// * @details $Sub$$__main_after_scatterload is called during system startup in the Keil
// * toolset. Global variable and static variable space must be set up by the compiler
// * prior to using these memory spaces. Setting up the SystemCoreClock and Board_Init
// * require global memory for variable storage and are called from this function in
// * the Keil tool chain.
// */
//void $Sub$$__main_after_scatterload(void)
//{
// SystemInit();
// $Super$$__main_after_scatterload();
//}
//#endif /* __CC_ARM */
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