isd2560.c

无线红外传感报警系统

#include "Head.h"
bit searchmusic(unsigned char track);
unsigned char musicstate=0;
unsigned char searchOK;
static unsigned char data SearchState;
//======================================================

bit music(unsigned char *buff)
{ 
     if(buff[musicstate]==0xff) 
	 { musicstate=0;SearchState=0; return 1;}
     if (searchmusic(buff[musicstate])) musicstate++;
	return 0;
}
bit searchmusic(unsigned char track)
{	
   switch (SearchState)
   {case 0:
			CE_ISD=1;
			A0_ISD=1;  //quick serach mode
			PD_ISD=1;  
			TimeCNT=1;
			SearchState=1;
			break;
	 case 1:
			if(TimeCNT<5) break;
			 PD_ISD=0;
			 TimeCNT=0;	//reset
		    if(track==1)
			  {
				A0_ISD=0;
				CE_ISD=0;  //play begin
				_nop_();
				_nop_();
				CE_ISD=1;
				TH0=0xff;
				TL0=0xff;
				TR0=1;
				TimeCNT=1;
				SearchState=2;
				break; 
			  }
			TH0=0XFF;
			TL0=0xff-track+2;
			TR0=1;
			SearchState=4;
			break;
	case 2: if(searchOK !=1 && TimeCNT<200) break;  //delay
			    searchOK =0;
				SearchState=0;
				TimeCNT=0;
				return 1;	
	case 4:
			if(searchOK !=1)   //wait the end of searching
			  {	CE_ISD=0;
				_nop_();
				_nop_();
				CE_ISD=1;
			 	TimeCNT=1;
				SearchState=5;
		     	break;
			  }
			searchOK =0;
			CE_ISD=0;   //play
			_nop_();
			_nop_();
			CE_ISD=1;
			TH0=0xff;
			TL0=0xff;
			TR0=1;
			TimeCNT=1;
			SearchState=6 ;
			break;
	case 5:
			if(TimeCNT<2) break; 
			   TimeCNT=0;
			   SearchState=4;		
			   break;   //delay();
	case 6:
			if(searchOK !=1 && TimeCNT<1550)  break;
			searchOK=0;
			SearchState=0;
			TimeCNT=0;
			return 1;
   }
   return 0;
}