LPC2103开发板WDT看门狗测试试验

#include "config.h"

#define LED1 (1 << 19)
#define KEY1 (1 << 18)

void DelayNS(uint32 dly)
{
    uint32 i;
    for(;dly > 0; dly--)
    {
        for(i = 0; i < 50000; i++);
    }
}

void WDTInit(uint32 uiTime)
{
    WDTC = uiTime;
    WDMOD = 0x03;
    
    
    WDFEED = 0xaa;
    WDFEED = 0x55;
}

void FeedDog(void)
{
    IRQDisable();
    WDFEED = 0xaa;
    WDFEED = 0x55;
    
    IRQEnable();
}

int main(void)
{
    uint32 i;
    PINSEL0 = 0x00000000;
    PINSEL1 = 0x00000000;
    
    IODIR = LED1;
    IOCLR = LED1;
    
    DelayNS(100);
    IOSET = LED1;
    
    WDTInit(0x200000);
    
    while(1)
    {
        while((IOPIN & KEY1) == 0);
        for(i = 0; i < 0xff; i++);
        FeedDog();
    }
}

#include "config.h"

#define LED1 (1 << 19)
#define KEY1 (1 << 18)

void DelayNS(uint32 dly)
{
    uint32 i;
    for(;dly > 0; dly--)
    {
        for(i = 0; i < 50000; i++);
    }
}

void WDTInit(uint32 uiTime)
{
    WDTC = uiTime;
    WDMOD = 0x03;
   
   
    WDFEED = 0xaa;
    WDFEED = 0x55;
}

void FeedDog(void)
{
    IRQDisable();
    WDFEED = 0xaa;
    WDFEED = 0x55;
   
    IRQEnable();
}

int main(void)
{
    uint32 i;
    PINSEL0 = 0x00000000;
    PINSEL1 = 0x00000000;
   
    IODIR = LED1;
    IOCLR = LED1;
   
    DelayNS(100);
    IOSET = LED1;
   
    WDTInit(0x200000);
   
    while(1)
    {
        while((IOPIN & KEY1) == 0);
        for(i = 0; i < 0xff; i++);
        FeedDog();
    }
}

实验现象，正常情况下：上电后，LED会闪一下。因为定时喂狗，就这样一直不闪了。

我们通过按键来模拟意外事件。

当长按住按键时，因为不能定时的喂狗，所以LED就会不停的闪烁。