main

来自「用AVR实现简单按键的程序与proteus的结合」· 代码 · 共 53 行

#include <iom16v.h>
#include <macros.h>

void port_init(void)
{
 PORTA = 0x0F;
 DDRA  = 0x0F; //PA0～PA3输出
 PORTB = 0x0F; //PB0～PB3使能内部上拉
 DDRB  = 0x00; //PB0～PB3为键盘输入，一定要设置为输入
 PORTC = 0x00; //m103 output only
 DDRC  = 0x00;
 PORTD = 0xFF;
 DDRD  = 0x05;
}

//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
}
//延时函数
void delay(void)
{
 unsigned char i;
 for(i=254;i!=0;i--)
 {
  asm("nop"); //空操作用于延时
 }
}

void main(void)
{
 unsigned char temp;
 init_devices();
 while(1)
 {
  temp=PINB;
  delay();        //延时去抖
  if(temp==PINB)  //再次读键盘值，如果和temp相同，则为有效按键，继续下一步操作
  {
  PORTA=PINB;    //把PINB口的值直接赋给PORTA
  }
 }
}