fskyiti.c

FSK通信的编程等等,使用2051编的,有模拟UART.

//OK,LIMIN,2001.10.4

#pragma ot (6)

#include <ABSACC.H>
#include <reg52.h>

#define uchar unsigned char
#define uint  unsigned int

sbit  ch_rx   = P1^3 ;
sbit  TX_EN   = P1^4 ;
sbit  ch_tx   = P1^2 ;
sbit  TX_ENABLE = P1^7;
sbit  wdi = P1^5;

//uchar ch_data[5]={0,0};
uchar receve_end_flag=0, rece_data=0, ch_counter=0,receive_byte_data=0;
uint  time0_flag=0;
bit   flag_send_over1=0, rece_flag=0, receive_byte_end_flag=0;
bit   CH_TI=1;

void dog() 
{
	wdi = ~wdi;
}

void ch_ser_short_delay() small
{
	unsigned char data i;
	for( i = 0 ; i < 12 ; i++ )
	{
		;
	}
}


void ch_ser_delay() small
{
	unsigned char data i;
	for( i = 0 ; i < 25 ; i++ )
	{
		;
	}
}

void modem_delay(unsigned char count) small
{
	unsigned char data i,j;
 	for(i = 0 ; i < count ; i++ )
	{
		for(j = 0; j < 255 ; j++ ) dog();
	}
}

void ch_ser_send(unsigned char buf) small
{

	unsigned char data i;
	//TR2 = 0;
	CH_TI = 0;
//	ch_rte = 0;
//	modem_delay(10);

	ch_tx = 0;
	ch_tx = 0;
	ch_ser_delay();
	for( i = 0 ; i < 8 ;i++ )
	{
		buf = buf>>1;
		//bitbuf = CY;
		ch_tx = CY;	
		ch_tx = CY;	
		ch_ser_delay();
	}
	
	ch_tx = 1;
	ch_tx = 1;
	ch_tx = 1;
	ch_tx = 1;
	ch_tx = 1;
	ch_tx = 1;
	ch_tx = 1;
	ch_tx = 1;
	ch_tx = 1;
	ch_tx = 1;
	ch_tx = 1;
	ch_tx = 1;
	ch_tx = 1;
	ch_ser_delay();

//	ch_rte = 1;
    CH_TI = 1;
//	TR2 = 1;
}






void main()
{
	    ch_rx = 1;
		TX_EN = 0;
        TX_ENABLE = 1;

	IT1 = 0;
//	EA=1;
//	EX1 = 1;
//    EX0 = 0;
	    SCON = 0x50;		//11.0592M,1200.8.1.N  p61
		TMOD = 0x21;		//P42
		PCON = PCON & 0x7f;
		TH1  =  0xfd;     //P61
		TL1  =  0xfd;
		TR1  =  1;			//P53.56.68.69.88
			
		TI  =  0;
		RI  =  0;
		
		EX0 =  0;			//禁止外部中断0的中断
		EX1 =  0;//1;			//禁止外部中断1的中断
	    ES  =  1;			//开放串行口中断
		EA  =  1;			//开放CPU总中断


		TH0 = 0xD8;
	    TL0 = 0xF0;
	    ET0 = 0;
	    TR0 = 0;
        
		ch_rx = 1;
		TX_EN = 0;
        TX_ENABLE = 1;
		EX1 = 1;

aa:	  	if(TX_ENABLE)
		{
			EX1 = 0;
			ES=1;
			TX_EN=1;
			modem_delay(2);
            ch_ser_send(0xff);
			modem_delay(1);
			//ch_ser_send(0xaa);
			//modem_delay(1);
            ch_ser_send(0xf0);
			modem_delay(1);
			ch_ser_send(0xf0);
			modem_delay(1);
			ch_ser_send(0xf0);
			modem_delay(1);
			while(TX_ENABLE)
			{
			  if(rece_flag)
			  {            
                ch_ser_send(rece_data);
			    rece_flag=0;
			    rece_data=0;
			  }
			}
			modem_delay(1);
			ch_ser_send(0x0f);
			modem_delay(1);
			ch_ser_send(0x0f);
			modem_delay(1);
			TX_EN = 0;
			EX1 = 1;
		}
	

	  if(receive_byte_end_flag)                    //
	  {
	   receive_byte_end_flag=0;
	   if( receive_byte_data!=0xf0) 
	   {  
	    receive_byte_data=0;  ch_counter=0;  
       }else
	   { 
		receive_byte_data=0; ch_counter++;
		TR0=1;  ET0=1; TH0=0XD8; TL0=0XF0; time0_flag=0;
	   }
       if(ch_counter==3)
	   {
		while(receve_end_flag<2)                          //包尾标记，用于判断是否结束本包的接收和转发。
		{
		EX1=1;
		if(time0_flag>=50)                                 //字节之间超时548ms，结束本包接受；
		{
		//TR0=0;  ET0=0; TH0=0XD8;  TL0=0XF0; time0_flag=0;
		goto yy;
		}
		
		if(receive_byte_end_flag)
		{
		receive_byte_end_flag=0;
                         //ch_data[ch_counter]=receive_byte_data;
		if(receive_byte_data==0x0f) { receve_end_flag++;  goto bb; }else{ receve_end_flag=0; }
		SBUF =receive_byte_data;
	    while(!flag_send_over1) {};	
		modem_delay(0);
		flag_send_over1=0;
			             
bb:		receive_byte_data=0;
		}
		}
yy:     TR0=0;  ET0=0; TH0=0XD8;  TL0=0XF0; time0_flag=0;      //关定时器；
        receve_end_flag = 0;
		ch_counter = 0;
	   }
	   //TR0=0;  ET0=0; TH0=0XD8;  TL0=0XF0; time0_flag=0;
       //receve_end_flag = 0;
	   //ch_counter = 0;
	   EX1 = 1;
		  
	  }

	  if(time0_flag>=1)                                       //收到第一个包头后10.8ms内没有收到下一个包头则本包无效;
	  {
	   TR0=0;  ET0=0; TH0=0XD8;  TL0=0XF0; time0_flag=0;
	   receive_byte_data=0;  ch_counter=0;
      }
	 	
	  goto aa;
}
	

void int1() interrupt 2 using 1
{
	unsigned char data i,ch_sbuf,x;
	unsigned char idata j=1,numb_0=0,numb_1=0;
	////////////////////////////////////////////
	// learn the comm
	///////////////////////////////////////////
    EX1=0;
	ch_sbuf = 0;
	ch_ser_short_delay();
	if(ch_rx ) { EX1=1; return;    };
	ch_ser_short_delay();
	ch_ser_short_delay();
	
	for( i = 0 ; i < 8 ; i++ )
	{
		ch_sbuf = ch_sbuf>>1;
		if(ch_rx)
		{
			ch_sbuf = ch_sbuf|0x80;
		}else
		{
			ch_sbuf = ch_sbuf|0x00;
		}
		ch_ser_delay();	
	}
	
	
	
	
	//receive_byte_data = ch_sbuf;  
	ch_rx = 1;
	//ch_ser_count++;
	//modem_delay(1);

	   for(i=0;i<8;i++)
	   {       
		    dog();
			if((ch_sbuf&j)==0) 
			{
				numb_0++;
			}else
			{
                numb_1++;
			}
			j=j<<1;
	   }
	   if(numb_0!=numb_1) 
	   {
        EX1=1;
		receive_byte_data=0;
		receive_byte_end_flag=0;
	   }else
	   {
		   EX1=0;
		receive_byte_end_flag=1;
        receive_byte_data=ch_sbuf;
	   }
       /*if(receive_byte_data==0xf0)
	   {
		   receive_byte_data=0xf0;
	   }
*/
       numb_0=0; numb_1=0;
	  
	
}
	

void  int_t0() interrupt 1   using 1
{ 
	time0_flag++;
    TH0=0xD8;TL0=0xF0;
}

void serial_port() interrupt 4 using 1
{
    ES=0;
	if(TI==1) { TI=0; flag_send_over1=1; ES=1; return; };					//发送中断标志位
	RI=0;
    rece_data = SBUF; 
	rece_flag = 1;
    ES=1;
}