wdt_lib.c

EASYARM8962开发板带的实例

/****************************************Copyright (c)****************************************************
**                               Guangzhou ZHIYUAN electronics Co.,LTD.
**                                     
**                                 http://www.embedtools.com
**
**--------------File Info---------------------------------------------------------------------------------
** File Name:                   WDT.c
** Last modified Date:          2007-09-17
** Last Version:                v1.0
** Description:                 程序正常运行时，使得LED3不断地闪烁，并喂狗。当按键按下时，触发GPIO按键
**                              中断，处理器进入死循环，看门狗定时器产生第一个超时信号，进入看门狗中断
**                              服务程序，LED4不断闪烁，直到看门狗定时器产生第二次超时信号，导致系统复
**                              位，系统再次正常运行，LED4不断地闪烁。使用Stellaris库函数。
** 
**--------------------------------------------------------------------------------------------------------
** Created By: 	                shaoxuefeng	
** Created date:                2007-09-17
** Version: 	                v1.0
** Descriptions:
**
**--------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
** Version:
** Description:
**
*********************************************************************************************************/
/*********************************************************************************************************
系统头文件配置
*********************************************************************************************************/
#include    "hw_memmap.h"													
#include    "hw_types.h"
#include    "hw_ints.h"
#include    "gpio.h"
#include    "interrupt.h"
#include    "sysctl.h"
#include    "systick.h"
#include    "watchdog.h"

#define     KEY1    GPIO_PIN_2                                          /*  定义KEY1                    */
#define     LED3    GPIO_PIN_6                                          /*  定义LED3                    */
#define     LED4    GPIO_PIN_5                                          /*  定义LED4                    */

/*********************************************************************************************************
** Function name:               GPIO_PORT_E_ISR
**
** Descriptions:                使程序进入死循环
**
** input parameters:            NONE
** output parameters:           NONE
**                          
** Returned value:              NONE
**
** Created by:                  shaoxuefeng
** Created Date:                2007-09-17
**--------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
**--------------------------------------------------------------------------------------------------------
*********************************************************************************************************/
void  GPIO_Port_E_ISR (void)			
{
	while(1);
}

/*********************************************************************************************************
** Function name:               delay
**
** Descriptions:                延时的多少取决于ulTime的大小
**
** input parameters:            unsigned long ulTime
** output parameters:           NONE
**                          
** Returned value:              NONE
**
** Created by:                  shaoxuefeng
** Created Date:                2007-09-07
**--------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
**--------------------------------------------------------------------------------------------------------
*********************************************************************************************************/

void delay (unsigned long ulTime)
{
    while (--ulTime != 0);                                              /*延时数量为ulTime个指令周期    */
}
/*********************************************************************************************************
** Function name:               Watchdog_Timer_ISR
**
** Descriptions:                反转LED4
**
** input parameters:            NONE
** output parameters:           NONE
**                          
** Returned value:              NONE
**
** Created by:                  shaoxuefeng
** Created Date:                2007-09-17
**--------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
**--------------------------------------------------------------------------------------------------------
*********************************************************************************************************/


void Watchdog_Timer_ISR (void)
{
	while(1){	
		GPIOPinWrite(GPIO_PORTC_BASE,LED4,~GPIOPinRead(GPIO_PORTC_BASE,LED4));
                                                                        /*  反转LED4                    */
		delay(100000);
		 	 }
}

/*********************************************************************************************************
** Function name:               main
**      
** Descriptions:                程序主函数
**
** input parameters:            NONE
** output parameters:           NONE
**                          
** Returned value:              NONE
**
** Created by:                  shaoxuefeng
** Created Date:                2007-09-17
**--------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
**--------------------------------------------------------------------------------------------------------
*********************************************************************************************************/

int main(void)
{
	SysCtlPeripheralEnable(SYSCTL_PERIPH_WDOG);                         /*  使能看门狗定时器            */
	SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);                        /*  使能GPIO B口                */
	SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOC);                        /*  使能GPIO C口                */
	SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOE);                        /*  使能GPIO E口                */
  								
	GPIOPadConfigSet(GPIO_PORTE_BASE, KEY1, GPIO_STRENGTH_2MA,				
                     GPIO_PIN_TYPE_STD_WPU);
	GPIODirModeSet(GPIO_PORTE_BASE, KEY1, GPIO_DIR_MODE_IN);            /*  设置连接KEY1的PE2为输入     */
  
	GPIOPadConfigSet(GPIO_PORTB_BASE, LED3, GPIO_STRENGTH_2MA,
                     GPIO_PIN_TYPE_STD_WPU);
	GPIODirModeSet(GPIO_PORTB_BASE, LED3, GPIO_DIR_MODE_OUT);           /*  设置连接LED3的PB6为输出     */			
		
  	GPIOPadConfigSet(GPIO_PORTC_BASE, LED4, GPIO_STRENGTH_2MA,
                     GPIO_PIN_TYPE_STD_WPU);
  	GPIODirModeSet(GPIO_PORTC_BASE, LED4, GPIO_DIR_MODE_OUT);           /*  设置连接LED4的PC5为输出     */
  
  	IntPrioritySet(INT_WATCHDOG,0x00);                                  /*  设置看门狗中断优先级为高    */
  	IntPrioritySet(INT_GPIOE,0x40);                                     /*  设置GPIO E口的中断优先级为低*/

 	GPIOIntTypeSet(GPIO_PORTE_BASE, KEY1, GPIO_FALLING_EDGE);           /*  设置KEY1中断触发方式为下降沿触
 	                                                                                                  发*/  
  	GPIOPinIntEnable(GPIO_PORTE_BASE, KEY1);                            /*  使能KEY1中断                */
 
 	IntEnable(INT_GPIOE);                                               /*  使能GPIO E口中断            */
  
  	IntEnable(INT_WATCHDOG);                                            /*  使能看门狗中断              */


  	WatchdogReloadSet(WATCHDOG_BASE, 6000000);                          /*  设置看门狗定时器的重载值    */
  	WatchdogResetEnable(WATCHDOG_BASE);                                 /*  使能看门狗定时器的复位功能  */
  	WatchdogEnable(WATCHDOG_BASE);                                      /*  使能看门狗定时器的中断      */
    WatchdogLock(WATCHDOG_BASE);                                        /*  使能看门狗定时器的锁定机制  */

  	while (1){
        GPIOPinWrite(GPIO_PORTB_BASE, LED3, ~GPIOPinRead(GPIO_PORTB_BASE, LED3));
    		                                                            /*  反转LED3                    */

        delay(500000);                                                  /*  延时                        */
    		
        WatchdogIntClear(WATCHDOG_BASE);                                /*  清除看门狗的中断标志、"喂狗"*/
                 }

}

/*********************************************************************************************************
  END FILE
*********************************************************************************************************/