ATMEGA16 系统复位及看门狗定时器例程

#include <iom16v.h> #include <macros.h> #define uchar unsigned char #define uint unsigned int //---------------------------------------- #define xtal 8 void delay_1ms(void) { uint i; for(i=1;i<(uint)(xtal*143-2);i++) ; } //========================================= void delay_ms(uint n) { uint i=0; while(i<n) { delay_1ms(); i++; } } //------------------------------------------- void port_init(void) { PORTA = 0x00; DDRA = 0x00; PORTB = 0xFF; DDRB = 0xFF; PORTC = 0x00; DDRC = 0x00; PORTD = 0x00; DDRD = 0x00; } //************** void watchdog_init(void) { WDR(); WDTCR = 0x08; } //========================================= void init_devices(void) { port_init(); watchdog_init(); } //***************************************** void main(void) { init_devices(); while(1) { PORTB=0xfe; delay_ms(3); PORTB=0xfd; delay_ms(3); PORTB=0xfb; delay_ms(3); PORTB=0xf7; delay_ms(3); WDR(); PORTB=0xef; delay_ms(3); PORTB=0xdf; delay_ms(3); PORTB=0xbf; delay_ms(3); PORTB=0x7f; delay_ms(3); PORTB=0xff; delay_ms(3); WDR(); } }