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cs_hfxt_start.c
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cs_hfxt_start.c
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/* --COPYRIGHT--,BSD
* Copyright (c) 2017, Texas Instruments Incorporated
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of Texas Instruments Incorporated nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* --/COPYRIGHT--*/
/*******************************************************************************
* MSP432 Clock System - HFXT例程
*
* 描述:
* 这是一个简单的代码示例,它启动连接到HFXTIN/HFXTOUT的48MHz晶振,
* 该例程显示了如何从HFXT启动高频晶体和源时钟信号。
* 外部晶振作为MCLK,然后使用SysTick(源自MCLK)使LED闪烁。
*
*
* MSP432P401
* ------------------
* /|\| |
* | | |
* --|RST P1.0 |---> P1.0 LED
* | PJ.3 HFXTIN |---------
* | | |
* | | < 48Mhz xTal >
* | | |
* | PJ.2 HFXTOUT |---------
*
******************************************************************************/
/* DriverLib Includes */
#include <ti/devices/msp432p4xx/driverlib/driverlib.h>
/* Standard Includes */
#include <stdint.h>
#include <stdbool.h>
int main(void)
{
//停用看门狗
MAP_WDT_A_holdTimer();
//配置引脚PJ.2和PJ.3为功能引脚,外接高速晶振
MAP_GPIO_setAsPeripheralModuleFunctionOutputPin(GPIO_PORT_PJ,
GPIO_PIN3 | GPIO_PIN2, GPIO_PRIMARY_MODULE_FUNCTION);
//配置引脚P1.0为输出,接LED
MAP_GPIO_setAsOutputPin(GPIO_PORT_P1, GPIO_PIN0);
//设置外部时钟频率,这个步骤是可选的,如果后续使用了getMCLK/getACLK等函数,则必须配置
CS_setExternalClockSourceFrequency(32000,48000000);
//启用HFXT.
//在开始之前,要配置VCORE=1以支持48MHz
MAP_PCM_setCoreVoltageLevel(PCM_VCORE1);
MAP_FlashCtl_setWaitState(FLASH_BANK0, 1);
MAP_FlashCtl_setWaitState(FLASH_BANK1, 1);
CS_startHFXT(false);
//配置MCLK=HFXT (HFXT= 48MHz)
MAP_CS_initClockSignal(CS_MCLK, CS_HFXTCLK_SELECT, CS_CLOCK_DIVIDER_1);
//配置SysTick计数值为12000000 (MCLK=48MHz,取反时间为0.25s)
MAP_SysTick_enableModule();
MAP_SysTick_setPeriod(12000000);
MAP_Interrupt_enableSleepOnIsrExit();
MAP_SysTick_enableInterrupt();
//使能全局中断
MAP_Interrupt_enableMaster();
while (1)
{
MAP_PCM_gotoLPM0();
}
}
void SysTick_Handler(void)
{
MAP_GPIO_toggleOutputOnPin(GPIO_PORT_P1, GPIO_PIN0);
}