ir_receiver.c

Keil 8051 C example RS232 to I2c

//#include <at89x52.H>              // SFR definition header file
#include <reg54.h>
#include <stdio.h>                 // prototype declarations for I/O functions
#include "SystemEvent.h"
//#include "enum.h"
//#include "StructDef.h" 
#include "Function.h" 
#include "ExtVar.h"  
#include <rtx51tny.h>                 /* RTX-51 tiny functions & defines      */ 
#include "RTOS.h"
#include "IRKey.h"
 
void InitTimer2(void){  
   TH2 =0x00;// (unsigned char) PERIOD;          // set timer period            
   TL2 = 0x00;//(unsigned char) PERIOD; 
   RCAP2H  = 0xe8;
   RCAP2L  = 0x00;
   CP_RL2=0;
   C_T2=0;
   TR2=1;		// auto reload mode   
} 
void ResetRemoteCTRL_Use_Timer1(void); 
void InitRemoteCTRL(void){
					 _RC_Data=0;
                     _RC_CTRL_Active=0;		 		 
				 	 ResetRemoteCTRL_Use_Timer1();
					 _IR_RepeatKeyDelay=_ClockX+0x80;	
 				  //   InitTimer2();
}
#define SMOD_   0x80  
sbit _IRx=P3^5;

void ResetRemoteCTRL_Use_Timer1(void){   
// Timer1 initial to counter mode 
// It interrupt T1_INT every once a falling edge input from T1 pin tigger from remote controller 
   _IRx=1;
   _xbit=_IRx;
// Set counter T1 mod =1;
   PCON|=SMOD_;
   TH1 =0xff;                   
   TL1 = 0xff; 
   TMOD&=0x0f; 
   TMOD = TMOD | 0x60;                          // select mode 2                 
   TCON&=0xf0;
  // TCON|=0x05;
   // enable timer 0 interrupt    
                                     
    TR1=1;
	_RC_Word=0xffffffff;
	_RC_CTRL_Reset=1;
	_RC_RepeatCommand=1;

	IP=0x08;  // Timer1 hightest piroty

	ET1 = 1; 
  	EA = 1;  
} 
 

void timer1 (void) interrupt 3 using 1 { 
		P2^=0x08;
/*
unsigned char _gx;
unsigned char _HiByte,_LowByte;
     _gx=TH2; 
	 TH2=0x00; 
	 TL2=0x00;  	 

//	if(_Busy==1) return;

	      _IRTimeOut=_ClockX+5;	

  		

 			//	_KeyTempX=0x09;//DetectButtomKey();   // pull which key press					    			
			//	isr_send_signal(_HDMIFuncX);
	 if(_RC_CTRL_Reset){ 	 			 			
	 				_RC_CTRL_Reset=0;  	
					_RC_RepeatCommand=0; 	            
	 				_CountOf_RC_Pulse=0x00;		// because we expect next pulse been detect will be a start bit 
		
					TR1=0;

					_FuncX|=_IRCommand; 
			isr_send_signal(_Init);										// and must be skip so initial the pulse counter to 0xff					 
 	 } 
	else {	   
				if(_CountOf_RC_Pulse==0x00){
				      if(_gx==0x28){   _RC_CTRL_Reset=1;  
                                 if(_IR_RepeatKeyEnable){
					                  _RC_RepeatCommand=1;					  				  
								      //_AL260FunctionModex
									  _FuncX|=_IRCommand; 
									  isr_send_signal(_Init);//_AL260FuncX); 
								  }
 		 
			   			 }	 	
	 	              else  if(_gx==0x30)  _CountOf_RC_Pulse=0x20; 												 
                            else _CountOf_RC_Pulse=0;
				} 	
				else {					                  	    			 
					  // Since our timer_0 interval set to 0x3800 / (11059200/12) = 15.5 ms so TH0/TL0 = 0x10000-0x3800 = 0xc800; count up
					  // and the time slot between reset pulse to start bit pulse been measure is 13.68 ms
					  // time slot of "0" is 1.12 ms  = 4.02 scale of TH0 counter 
                      // time slot of "1" is 2.24 ms  = 8.04 scale of TH0 counter
					  // so we select a threshold value 5 to test "0" or "1" input			 
 						_RC_Word<<=1;   
			 		  if(_gx>5) _RC_Word|=0x00000001;
				 	     --_CountOf_RC_Pulse;				 				 
					  if(!_CountOf_RC_Pulse){   _RC_CTRL_Reset=1;		
                          _HiByte=(unsigned char)((_RC_Word>>8)&0x00ff);
						  _LowByte=(unsigned char)(_RC_Word &0x00ff);
//						_RC_x=_RC_Word;	
					   if((_LowByte+_HiByte)==0xff){
					 //   _IRTimeOut=_ClockX+10;
					
					_FuncX|=_IRCommand;
			    	isr_send_signal(_Init);//_AL260FuncX);
					      _IR_RepeatKeyDelay=_ClockX+0x8;
                          _IR_RepeatKeyEnable=0;
					   }
				  	}
					  else if(_gx>0x0a) _RC_CTRL_Reset=1;                	
				}						
	} 	

	*/
}

/**/
code unsigned char _RCKeyTable[0x1e]={
_1x,//  			0x08		// 08f7  61d6
_2x,//	 			0x88		// 8877  61d6
_3x,//	 			0x48		// 48b7  61d6
_4x,//	 			0xc8		// c837  61d6
_5x,//	 			0x28		// 28d7  61d6
_6x,//	 			0xa8		// a857  61d6
_7x,//	 			0x68		// 6897  61d6
_8x,//	 			0xe8		// 8e17  61d6

_9x,//	 			0x18		// 18e7  61d6
_0x,//	 			0x58		// 58a7  61d6
_Recall,//			0xd8		// d827  61d6
_Scan,//			0x98		// 9867  61d6
_Select,//			0x50		// 50af  61d6
_Up,//				0x10		// 10ef  61d6
_Left,//			0x90		// 906f  61d6
_Right,//			0xd0		// d02f  61d6

_Down,//			0x30		// 30cf  61d6
_Menu,//			0xf0		// f00f  61d6
_ExitRC,//			0x70		// 708f  61d6
_Res,//				0xb0		// b04f  61d6
_Input,//			0xa0		// a05f  61d6
_Mts,//				0x60		// 609f  61d6
_Mute,//			0xe0		// e01f  61d6
_Channel_Add,//  	0x40		// 40bf  61d6

_Channel_Sub,//		0x80		// 807f  61d6
_Volume_Add,//		0xc0		// c03f  61d6
_Volume_Sub,//		0x20		// 20df  61d6
_Power,//			0x00		// 00ff  61d6
_Repeat,//			0xa5		// 00ff  61d6
_UnKnow	//			0xff
};
 
unsigned char DecodeIRCommand(unsigned long _RC_WordX){	
unsigned char _RC_DataX; 
unsigned char _gx;
unsigned char _hx;
unsigned char _ix;
unsigned int _Xadr;
 				
						_Xadr=(unsigned int)((_RC_WordX>>0x10)&0x0000ffff);
						if(_Xadr==0x61d6){
                       // 0x61d6 is a ID code transmitted from remote controller      	  
								//	_RC_Word>>=0x10;
  
 									_Xadr=(unsigned int)(_RC_WordX&0x0000ffff);
									_gx=(unsigned char)(_Xadr&0x00ff);
									_Xadr>>=8;
									_hx=(unsigned char)(_Xadr&0x00ff);

									if((_hx|_gx)==0xff){
                    						for(_ix=0;_ix<0x1d;_ix++){
												if(_hx==_RCKeyTable[_ix]) break;
											}						
											if(_ix<0x1d){	                                    
										 		_RC_DataX=_hx;
												//	RunRCFuncX(_RC_Data);
											 
											}
											else _RC_DataX=0xff;  // unknow										
									}											
						}

						else {
							if((_RC_RepeatCommand==1)&&(_RC_Data!=0xff)){ 
					 
								_RC_DataX=0xf0;
							}									
						}
 
								
 		return(_RC_DataX);
}	
	      

unsigned char RCFuncX(unsigned char _RC_DataX){
static unsigned char _gx;
unsigned char _dx; 
		switch(_RC_DataX){
			case	_Right:
			case	_Up: 
			case	_1x: 
 
                           _gx=_AddKey;
						   _dx=_gx;
						break;
			
	        case	_Down: 
 					 
            case	_Left:
			case	_2x: 
   
						   _gx=_SubKey;	
						    _dx=_gx;	
						break;
			case	_Select: 
			case	_3x:  
					  
 						   _gx=_SelKey;
                            _dx=_gx;
						break;
			case	_4x: 
						break; 
			case	_5x: 
			case	_6x: 
			case	_7x: 
			case	_8x: 
			case	_9x: 
			case	_0x: 
			case	_Recall: 
			case	_Scan: 
//			case	_Select: 
//			case	_Up: 
//			case	_Left: 
//			case	_Right: 
//			case	_Down: 
			case	_Menu: 
						break;
			case	_ExitRC: 
							  
							   // if(_DebugMode==0){_DebugMode=1; 	ResetRemoteCTRL_Use_Timer1(); }
								//		else _DebugMode=0;	
						break;
			case	_Res: 	
 
//				 	 ResetRemoteCTRL_Use_Timer1();
 						break;
			case	_Repeat:
					 	 _dx=_gx;
						break;
			case	_Input: 
			case	_Mts: 
			case	_Mute: 
			case	_Channel_Add: 
			case	_Channel_Sub: 
			case	_Volume_Add: 
			case	_Volume_Sub: 
			case	_Power: 
			case	_UnKnow: 
						break;
		}
				return(_dx);
}