systick.c

easyARM8962 systick系统节拍时钟操作实验源码

/****************************************Copyright (c)****************************************************
**                            Guangzhou ZHIYUAN electronics Co.,LTD.
**                                      
**                                 http://www.embedtools.com
**
**--------------File Info---------------------------------------------------------------------------------
** File name:               SysTick.c
** Latest modified Date:    2007-09-16
** Latest Version:          1.1
** Descriptions:            利用系统定时器产生1秒的定时，实现LED的翻转
**
**--------------------------------------------------------------------------------------------------------
** Created by:              Zhao shimin
** Created date:            2007-09-16
** Version:                 1.0
** Descriptions:            The original version
**
**--------------------------------------------------------------------------------------------------------
** Modified by:            
** Modified date:           
** Version:                 
** Descriptions:            
**
*********************************************************************************************************/

/*  调用库函数的头文件　　            */
#include "hw_memmap.h"
#include "hw_types.h"
#include "hw_ints.h"
#include "gpio.h"
#include "interrupt.h"
#include "sysctl.h"
#include "systick.h"


#define LED6 GPIO_PIN_5		                                           /* PA5                       */
/*********************************************************************************************************
** Function name:           main
**
** Descriptions:            利用系统定时器产生1秒的定时，翻转LED
**
** input parameters:        NONE
** output parameters:       NONE
**                          
** Returned value:          NONE
**
** Created by:              Zhao shimin
** Created Date:            2007/09/16
**--------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
**--------------------------------------------------------------------------------------------------------
*********************************************************************************************************/
int main (void)
{
    /*  设置系统时钟为直接使用外部晶体的频率6MHz　　　*/
    SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN | SYSCTL_XTAL_6MHZ);
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);                        /*  给GPIOD提供时钟             */

    /*  设置GPIO7为推挽，2MA输出　　　　　　　　　　　*/
    GPIOPadConfigSet(GPIO_PORTA_BASE, LED6 ,GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_STD);
    GPIODirModeSet(GPIO_PORTA_BASE,LED6 ,GPIO_DIR_MODE_OUT);            /*  设置GPIOD7为输出            */

    IntMasterEnable();                                                  /*  开放总中断                  */
    SysTickPeriodSet(6000000);                                          /*  设置定时周期为1秒，即6M     */
    SysTickEnable();                                                    /*  系统定时器使能              */
    SysTickIntEnable();                                                 /*  系统定时器中断使能          */


    while (1) {
	    ;
    }
}
/*********************************************************************************************************
** Function name:           SysTick_ISR
**
** Descriptions:            系统定时器中断函数，翻转LED
**
** input parameters:        NONE
** output parameters:       NONE
**                          
** Returned value:          NONE
**
** Created by:              Zhao shimin
** Created Date:            2007/09/16
**--------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
**--------------------------------------------------------------------------------------------------------
*********************************************************************************************************/

void SysTick_ISR (void)
{
    GPIOPinWrite(GPIO_PORTA_BASE,LED6, ~GPIOPinRead(GPIO_PORTA_BASE, LED6));
}
/*********************************************************************************************************
  END FILE
*********************************************************************************************************/