m8.c

avr_mega8对普通i/o按键的识别与判断

//ICC-AVR application builder : 2007-8-8 10:33:08
// Target : M8
// Crystal: 8.0000Mhz

#include <iom8v.h>
#include <macros.h>

void port_init(void)
{
 PORTB = 0x00;
 DDRB  = 0x00;
 PORTC = 0x00; //m103 output only
 DDRC  = 0x00;
 PORTD = 0x00;
 DDRD  = 0x00;
}

//call this routine to initialize all peripherals
void init_devices(void)
{
 //stop errant interrupts until set up
 CLI(); //disable all interrupts
 port_init();

 MCUCR = 0x00;
 GICR  = 0x00;
 TIMSK = 0x00; //timer interrupt sources
 SEI(); //re-enable interrupts
 //all peripherals are now initialized
}

void main()
{
 init_devices();
 DDRC=0XFF;
 PORTC=0XF0;
 DDRB=0XFF;
 PORTB=0XFF;
 while(1)
 {
 //;
 DDRB=0;			         //按下拉低
 if(!(PINB&0X01)) PORTC=0X0F;
 if(!(PINB&0X02)) PORTC=0X00;
 }
}