ire.c

16个单片机c语言实验程序

#include <iom16v.h>
#include <macros.h>
#define uchar unsigned char
#define uint unsigned int

//端口初始化
void port_init(void)
{
 PORTA = 0xff;
 DDRA  = 0xff;
 PORTB = 0xff;
 DDRB  = 0xff;
 PORTC = 0xff; 
 DDRC  = 0xff;
 PORTD = 0xff;
 DDRD  = 0xff;
}

//T0初始化，产生38k的载波
// actual value: 38.462KHz (1.2%)
void timer0_init(void)
{
 TCCR0 = 0x00; //stop
 ASSR  = 0x00; //set async mode
 TCNT0 = 0xe8; //set count
 OCR0  = 0x34;
 TCCR0 = 0x02; //start timer
}

//T0中断
#pragma interrupt_handler timer0_ovf_isr:iv_TIM0_OVF
void timer0_ovf_isr(void)
{
 TCNT0 = 0xe8; //reload counter value
 PORTD^=(1<<1);  //引脚输出38K信号
}

//TIMER1 initialize - prescale:8
// WGM: 0) Normal, TOP=0xFFFF
// desired value: 588Hz
// actual value: 588.062Hz (0.0%)
timer1_init(uchar th,uchar tl)
{
 TIFR|=0X04;          //复位溢出标志
 TCCR1B = 0x00;       //stop
 TCNT1H = th;         //setup
 TCNT1L = tl;
 TCCR1A = 0x00;
 TCCR1B = 0x02;       //start Timer
 while(!(TIFR&0X04)); //溢出后离开
}

//call this routine to initialize all peripherals
void init_devices(void)
{
 //stop errant interrupts until set up
 CLI(); //disable all interrupts
 port_init();
 timer0_init();

 MCUCR = 0x00;
 GICR  = 0x00;
 TIMSK = 0x01; //timer interrupt sources
 SEI(); //re-enable interrupts
 //all peripherals are now initialized
}

out_1() //输出1
{
TIMSK=0x01;               //发送
timer1_init(0xfb,0xa0);  //560us
TIMSK=0x00;               //停止发送
timer1_init(0xf2,0xb7);  //1650us
}

out_0() //输出0
{
TIMSK=0x01;               //发送
timer1_init(0xfb,0xa0);  //560us
TIMSK=0x00;               //停止发送
timer1_init(0xfb,0xa0);  //560us
}

out_f() //输出结束
{
TIMSK=0x01;               //发送
timer1_init(0xfb,0xa0);  //560us
TIMSK=0x00;               //停止发送
}

//发送函数
void send_n(uchar aa,uchar bb)  //aa系统码,bb键码
{
 uchar cc,i;
 TIMSK=0x01;
 timer1_init(0xb9,0x9e);     //引导码9ms低
 TIMSK=0x00;
 timer1_init(0xdc,0xcf);     //引导码4.5ms高
 //发送系统码      
 cc=0x80;
 for(i=0;i<8;i++)        
    {
     if(aa&cc)
       {
        out_1();
       }
     else
       {       
        out_0();
       }
    cc=cc>>1;
    }
 //发送系统反码
 aa=~aa;
 cc=0x80;
 for(i=0;i<8;i++)        
    {
     if(aa&cc)
       {
        out_1();
       }
     else
       {       
        out_0();
       }
    cc=cc>>1;
    }
 //发送键码   
 cc=0x80;
 for(i=0;i<8;i++)
    {
     if(bb&cc)
       {
        out_1();
       }
     else
       {       
        out_0();
       }
    cc=cc>>1;
    }
 //发送键码反码
 bb=~bb;
 cc=0x80;
 for(i=0;i<8;i++)
    {
     if(bb&cc)
       {
        out_1();
       }
     else
       {       
        out_0();
       }
    cc=cc>>1;
    }
//结束
out_f();
}

main()
{
init_devices();
while(1)
     {
      send_n(0x00,0x58);   //发送遥控码
	  while(1);
     }
}