ysd.c

这是一个用于视频切换的控制程序,采用AT89C51芯片,KEIL 51开发

#include " reg52.h"
#include "main.h"
//#include "string.h"

//unsigned char data dvr_set;                           //cumputer set or cancel alarm
extern bit flag_ea;





//unsigned char code My_Array1[6]={0x4a,0x44,0x41,0x43,0x46,0x4b};
extern void delay1ms(unsigned char  count);
extern void send_char_com(unsigned char ch);
//extern void com_isr(void);
/*------------------------------------------------------------------
                send the data sbuf
  ------------------------------------------------------------------*/
//void send_char_com (unsigned char ch)
//{ 
  //	SBUF=ch;
//	while(TI==0);
//	TI=0;
//} 
/* -----------------------------------------------------------------
             deal with the dvr inquire command
   -----------------------------------------------------------------*/
 void alarm2_in (void)
{
 unsigned int i=0;
 unsigned char tbuf[8];
 RT_CON=1;
 delay1ms(1);
 tbuf[0]=0x2a;
 tbuf[1]=0x06;
 tbuf[2]=0x01;
 tbuf[3]=0x00;
 tbuf[4]=0xb0;// & dvr_set); 
 tbuf[5]=~P0;
 tbuf[6]=0x00;
 tbuf[7]=tbuf[1]+tbuf[2]+tbuf[3]+tbuf[4]+tbuf[5]+tbuf[6];
 
   
	do
	{
		send_char_com(tbuf[i]);
	//	delay1ms();
		i++;
	} while(i <8 );
 RT_CON=0;
 } 
 


  


extern void ysd(unsigned char rbuf1[8])
{
       unsigned char data s;
	   s=rbuf1[1];
	   switch(s)
		  {
		   case 0x04:alarm2_in();
		          break;
		   case 0x06:P2=rbuf1[5];
		          break;
		  }
                 
	  flag_ea=1;
	 
}