S3C2440-WDT
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看門狗定時(shí)器計(jì)數(shù)寄存器：
WTCNT包含看門狗定時(shí)器的當(dāng)前值。
下面是看門狗復(fù)位的程序：
#define WTCON (*(volatile unsigned *) 0x53000000)
#define WTDAT (*(volatile unsigned *) 0x53000004)
#define WTCNT (*(volatile unsigned *) 0x53000008)
int WdtMain(){
WTCON = 0x64＜＜8; //Prescaler=100,時(shí)鐘頻率為3.9KHz
WTCON |= (0x1＜＜5)|(0x1); //看門狗定時(shí)器超時(shí)，發(fā)出復(fù)位信號
WTCON |= 0x3＜＜3; //Division=128
WTDAT = 0x2DC6; //使復(fù)位時(shí)間為3s
WTCNT = 0x2DC6;
while(1){}
return 0;
}
看門狗定時(shí)程序：
#define rGPBCON (*(volatile unsigned *)0x56000010)
#define rGPBDAT (*(volatile unsigned *)0x56000014)
#define rGPBUP (*(volatile unsigned *)0x56000018)
#define rSRCPND (*(volatile unsigned *)0x4a000000)
#define rINTMSK (*(volatile unsigned *)0x4a000008)
#define rINTPND (*(volatile unsigned *)0x4a000010)
#define rSUBSRCPND(*(volatile unsigned *)0x4a000018)
#define rINTSUBMSK(*(volatile unsigned *)0x4a00001c)
#define rWTCON (*(volatile unsigned *)0x53000000)
#define rWTDAT (*(volatile unsigned *)0x53000004)
#define rWTCNT (*(volatile unsigned *)0x53000008)
#define _ISR_STARTADDRESS 0x33ffff00
#define pISR_WDT_AC97 (*(unsigned *)(_ISR_STARTADDRESS+0x44))
#define U32 unsigned int
void delay(int a)
{
int k,i,j;
for(k=0;k＜a;k++)
for(i = 0; i ＜ 0xff; i++)
for(j = 0; j ＜ 0xff; j++)
;
}
void __irq WDT_ISR(void){
rGPBDAT |= 0x1;
delay(100);
rGPBDAT &= 0xfe;
rSUBSRCPND = 0x1＜＜13;
rSRCPND = 0x1＜＜9; //SRCPND 通過寫入數(shù)據(jù)清零，如果不清零，會反復(fù)進(jìn)行請求
rINTPND = 0x1＜＜9;
}
int Main(){
rGPBCON = 0xfffc;
rGPBCON |= 0x1;
rWTCON = 0x64＜＜8; //Prescaler=100
rWTCON |= (0x1＜＜5)|(0x1＜＜2); //WDT計(jì)時(shí)器使能，中斷使能
rWTCON |= 3＜＜3;
rWTDAT = 0x1E84; //使中斷時(shí)間為2s
rWTCNT = 0x1E84;
rSUBSRCPND = 0x1＜＜13;
rSRCPND = 0x1＜＜9; //SRCPND 通過寫入數(shù)據(jù)清零，如果不清零，會反復(fù)進(jìn)行請求
rINTPND = 0x1＜＜9;
rINTSUBMSK = "(0x1＜＜13);
rINTMSK = "(0x1＜＜9);
pISR_WDT_AC97 = (U32)WDT_ISR;
while(1);
return 0;
}
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