发射.c

毕业设计—红外遥控电子密码锁

#include <stc89.h>

//13.37589

#define uchar unsigned char
#define uint unsigned int
sbit led=P3^7;
sbit out=P3^6;
#define port P2

//定义地址码
#define addr0  0x01
#define addr1  0x02


bit key_bit;  //按键重复标记
bit hw;
bit over;
bit ss;

uchar time;


void delay();
void InitTimer0(void);
void InitUART(void);
void send(uchar c);
uchar key();
void send_star();
void send_char(uchar c);
void send_hw(uchar c);

void delay1s(void)   //误差 -0.000000000003us
{
    unsigned char a,b,c;
    for(c=45;c>0;c--)
        for(b=132;b>0;b--)
            for(a=167;a>0;a--);
}


void delay()   //1ms 误差 -0.651041666667us
{
    unsigned char a,b;

    for(b=102;b>0;b--)
        for(a=3;a>0;a--);
}

void InitTimer0(void)
{
    TMOD = 0x22;
    TH0 = 0xe6;
    TL0 = 0xe6;
    EA = 1;
    ET0 = 1;
    TR0 = 1;
}                   //13us

void InitUART(void)	//4800
{
//    TMOD = 0x20;
    SCON = 0x50;  //采用串口工作方式1（8位异步收发，波特率可变）；允许串行口接收数据
    TH1 = 0xF3;
    TL1 = TH1;
    PCON = 0x00;
    ES = 1;
	TR1 = 1;
}
void send(uchar c)
{
    SBUF = c;
    while(!TI);//一直发送数据，直至发送完毕
    TI = 0;
}


uchar key()
{
 uchar a;
 a=0;
 port=0x0f;
 a=port;
 
 if(a==0x0f) 
   {
     key_bit=1;  
	 delay();
	 return 0;
   }
 if(!key_bit) return 0;
 delay();
 if(port==a)	 
 {	
  port=0xf0;
  a|=port;
  a=~a;
 }
 else return 0;
 if(a)
 {
  key_bit=0;
  switch(a)
  {
   case 0x11:  return 1;
   case 0x12:  return 2;
   case 0x14:  return 3;
   case 0x18:  return 4;
   case 0x21:  return 5;
   case 0x22:  return 6;
   case 0x24:  return 7;
   case 0x28:  return 8;
   case 0x41:  return 9;
   case 0x42:  return 10;
   case 0x44:  return 11;
   case 0x48:  return 12;
   case 0x81:  return 13;
   case 0x82:  return 14;
   case 0x84:  return 15;
   case 0x88:  return 16;
   default: return 0;
  }
 }// if(a)
}

void main(void)
{
    uchar c;
	InitTimer0();
	InitUART();
	led=0;
	send(0xaa);	//为了测试串口是否正常工作
while(1)
{
 c=key();
 if(c)
  {
    send(c);
	send_hw(c);
  }
 

}
}

void send_star()
{
 uchar i;
 i=8;
 /*9ms内发射38KHZ方波*/
 while(i--)
 {
  time=173;		 //9ms
  hw=1;			 //发射
  while(!over);
 }
 /*4.5ms内发射高电平*/
 i=4;
 while(i--)		 //4.5ms
 {	 
  time=173;
  hw=0;
  while(!over);	 
 }
}

void send_char(uchar c)
{
 uchar i;
 for(i=0;i<8;i++)
 {
  time=45;
  hw=1;		   //0.565ms的38KHZ方波
  while(!over);
  
  if(c&0x80) time=126; //1.685ms的间隔
  else time=45;	 //0.565ms的间隔
  hw=0;
  c=c<<1; 
  while(!over);
  time=45;
  hw=1;
   
 }
}

void send_hw(uchar c)
{
 key_bit=0;
 send_star();
 send_char(addr0);
 send_char(addr1);
 send_char(c);
 send_char(~c);

}

void Timer0Interrupt(void) interrupt 1
{
 if(time) time--,over=0;
 else over=1,hw=0;
 if(hw) out=~out;
 else out=1;
}

void UARTInterrupt(void) interrupt 4
{
 uchar c;
    if(RI)
    {
        RI = 0;		//接收中断标志位；RI=1，表示数据接收完毕，并申请中断，要求CPU从接收SBUF提走数据，
     /*   c=SBUF;	  SBUF是独立的接收发送缓冲器，可同时发送、接收数据，必须由软件清零
		if(c==0xaa) ya
		{
		  delay1s();
		  ISP_CONTR=0x60;
		} 为了方便下载*/ 
    }
    else
        TI = 0; //发送中断标志位；TI=1，表示一帧数据发送结束；TI必须由软件清零
}