ir.c

关于红外遥控器的接收的一端程序

/************************************************************************/
/*	Copyright(c)  2003, ShenZhen, All Rights Reserved	                                                        */
/*	Created By DuirkWang, 08.21.2003 										*/
/* 	File: 	Ir.c													                	*/
/*	Ver:	1.0.1															*/
/*	Project:        															*/
/*	Description: NEC format   IR process routine									*/
/************************************************************************/
#include "Config.h"
#include "Reg52.h"
#include "global.h"
#include "Extern.h"
#include "Event.h"
#include "tools.h"
#include "i2c.h"
#include "ir.h"
#include "Avswitch.h"
#ifdef CD_CHANGER
#include "Cdc.h"
#endif
#include "command.h"
#include "ir_lut.h"

// Hoe many repeat message will ignore before send it to the FSM's
#define REPEAT_DELAY		5

enum {
	IR_IDLE,
	IR_HEADER,
	IR_CUSTOM
};

BYTE idata IrState = IR_IDLE;
Uint16 idata IrData = 0;
BYTE xdata IrDataBitCnt = 0;

WORD	xdata ir_code=0x0ff;
WORD	xdata custom_code;				// Hold the custom (remote ID) code
BYTE	xdata last_ir_code=0x0ff;	// Hold the ir code
BYTE	xdata repeat_delay = REPEAT_DELAY;	// Repeat code counter
BYTE	xdata valid_repeat = 0;
extern BIT dac_key_flag;
Uint8 idata eject_flag_cnt = 0;
extern BIT open_require_flag;
extern BIT close_require_flag;

#define IR_LEADER     27000
#define DATA_0          2240
#define DATA_1          4480
#define IR_REPEAT_LEADER      23000

#define LEADER_MARGIN	800
#define IR_MARGIN		300

void Require_flag_set();
void Close_flag_set();

void InitInt0()
{
    	IT0=1;		//down edge interrupt
    	PX0=1;
	IE0=0;
	EX0=1;		//open INT0
	EA=1;
}


void IR_init()
{
	TMOD&=0x0F;
	TMOD|=0x10;
	TH1 = 0;
	TL1 = 0;
	TR1 = 0;
}

static void IR_decode()
{
	WORD width;
	BIT IrError = 0;

	HIBYTE(width) = TH1;
	LOBYTE(width) = TL1;

	if (TF1 == 1) {
		IrState = IR_IDLE;
		TF1 = 0;
     		}

	switch (IrState) {
		case IR_IDLE:
			IrState = IR_HEADER;
			break;

		case IR_HEADER:
			if ((width >= IR_LEADER - LEADER_MARGIN) && (width <= IR_LEADER +LEADER_MARGIN)) {
				IrState = IR_CUSTOM;
				IrData = IrDataBitCnt = 0;
			}else if((width >= IR_REPEAT_LEADER - LEADER_MARGIN) &&
							(width <= IR_REPEAT_LEADER +LEADER_MARGIN))
					{
					if (repeat_delay)
						{
						eject_flag_cnt = 3;						
						// Delay before sendnig the first repeat
						repeat_delay--;
						}
					else
						{ // repeat last ir_code
						if (valid_repeat)
							{
							if(last_ir_code == IRKC_SETUP)
								{
								dac_key_flag = 1;
								valid_repeat = 0;
								Send_Event( IE_UI_REMOTE_INPUT);
								}
							#ifndef AVC500_FUTE
							else if((last_ir_code == IRKC_EJECT2) || (last_ir_code == IRKC_EJECT))
								{
								Close_flag_set();
								Send_Event( IE_UI_REMOTE_INPUT);
								valid_repeat = 0;
								}
							#endif
							else
								{
								ir_code=last_ir_code;
								Send_Event( IE_UI_REMOTE_INPUT);
								if((ir_code == IRKC_SEARCH_NEXT) || (ir_code == IRKC_SEARCH_PREV)
									|| (ir_code == IRKC_SEARCH_NEXT2) || (ir_code == IRKC_SEARCH_PREV2)
								#ifdef BLACK_VOLTAGE
								|| (ir_code == IRKC_BLACK_SCREEN)
								#endif
								)
								valid_repeat = 0;
								}
							}
				}
				IrState = IR_HEADER;
			}
			else
				IrError = 1;
			break;

		case IR_CUSTOM:
			IrData <<= 1;
			if ((width >= DATA_1 - IR_MARGIN ) && (width <= DATA_1 + IR_MARGIN))
				IrData |= 1;
			else if ((width >= DATA_0 - IR_MARGIN) && (width <= DATA_0 + IR_MARGIN))
					;
			else
				IrError = 1;

			IrDataBitCnt ++;

			if (IrDataBitCnt == 16)  {
				if((IrData != g_ir_system_code) &&
							(IrData != g_ir_system_code2))
				IrError = 1;
				else
				custom_code = IrData ;
			} else if (IrDataBitCnt == 32) {
					{

					ir_code = (IrData >> 8) & 0xff;
					last_ir_code=ir_code;
					if(custom_code ==g_ir_system_code)
					{
						switch(ir_code)
						{
							case IRKC_LEFT:
							case IRKC_RIGHT:						
							case IRKC_UP:
							case IRKC_DOWN:										
								valid_repeat = 1;
								repeat_delay=REPEAT_DELAY;
								break;
							case IRKC_FASTR:
							case IRKC_FASTF:	
								if((AV_ID == FM_ID) || (AV_ID == TV_ID))
									{
									if(ir_code == IRKC_FASTR)
										last_ir_code = IRKC_SEARCH_PREV;
									else if(ir_code == IRKC_FASTF)
										last_ir_code = IRKC_SEARCH_NEXT;									
									valid_repeat = 1;
									repeat_delay=REPEAT_DELAY;
									}
								else
									valid_repeat = 0;
								break;
							case IRKC_SETUP:
								valid_repeat = 1;
								repeat_delay=4 * REPEAT_DELAY;
								break;
							#ifndef AVC500_FUTE
							case IRKC_EJECT:	
								last_ir_code = IRKC_EJECT;
								valid_repeat = 1;
								repeat_delay=REPEAT_DELAY;
								Require_flag_set();
								eject_flag_cnt = 3;
								break;			
							#endif	
							default:
								valid_repeat=0;
								break;
						}
					}
					else if(custom_code == g_ir_system_code2)
					{
						switch(ir_code)
						{
							case IRKC_LEFT2:
							case IRKC_RIGHT2:							
							case IRKC_UP2:
							case IRKC_DOWN2:										
								valid_repeat = 1;
								repeat_delay=REPEAT_DELAY;
								break;
							#ifndef AVC500_FUTE
							case IRKC_EJECT2:	
								last_ir_code = IRKC_EJECT2;
								valid_repeat = 1;
								repeat_delay=REPEAT_DELAY;
								Require_flag_set();	
								eject_flag_cnt = 3;								
								break;			
							#endif	
							#ifdef BLACK_VOLTAGE
							case IRKC_TIME2:	
								last_ir_code = IRKC_BLACK_SCREEN;
								valid_repeat = 1;
								repeat_delay=REPEAT_DELAY;								
								break;
							#endif
							default:
								valid_repeat=0;
								break;
						}
					}
					Send_Event(IE_UI_REMOTE_INPUT);
					}
				IrState = IR_IDLE;
			}

			break;

	}

	if (IrError)
		{
		valid_repeat = 0;
		IrState = IR_IDLE;
		}
}

void IR_interrupt_server() interrupt 0
{
		Disable_TIME1;
		IR_decode();
		Clear_TIME1;
		Enable_TIME1;
}