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红外解码困惑

已有 545 次阅读2012-12-5 22:50 |系统分类:单片机| 红外, 解码

以下是我的红外解码程序。但一直有个问题弄不清出：文中红色标记的语句如果注释，就无**确解码。此程序是参考天狼星教程的。

#include"STC52.h" //晶振12MHz
#include"intrins.h"

typedef unsigned char BYTE; //Bits 8; value range 0-255
typedef unsigned int WORD; //Bits 16;value range 0- 65536
#define NOP _nop_()

#define SegPort   P0      //数码管段位输出口
#define DigitPort P1      //数码管位
#define TimerHighInitValue 0xEC    //定时器初值高位
#define TimerLowInitValue 0x78    //定时器初值低位

BYTE CurDigit = 0; //当前点亮的数码管
//共阳型数码管 0-9 字码数组，存储在代码区
code BYTE SegCode[] = {0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83, 0xc6,0xa1,0x86,0x8e};
//位选，第一位为最右边位，
code BYTE DigitSelect[] = {0xf7,0xfb,0xfd,0xfe};
//数码管显示缓冲区数组
BYTE SegBuf[4] = {0};

bit IRDecode;
bit IRDataFrame;
bit Timer1IRQEvent;
bit StartReceive;
BYTE IRTime = 0;
/*STC89C51/52RC/RD 禁止ALE,扩展RAM。内部扩展RAM(1024字节),
*物理上是内部，逻辑上是外部，C语言用 xdata 声明存储类型即可
*于此相关的特殊功能寄存器为 AUXR(0X8E),0：ALEOFF,1：EXTRAM;
*Reset value xxxx,xx00;
*/
BYTE xdata IRData[33] = {0};
WORD IRCode[4] = {0};

void Timer0Init();
void Timer1Init();
void INT1Init();
void SegRefreshDisplayBuf();
void SegDisplay();
void display();
void delay();
void IRDataDecode();

void main()
{
Timer0Init();
Timer1Init();
INT1Init();
SegRefreshDisplayBuf();
EA = 1;
while(1)
{
  if(IRDataFrame)
  {
   IRDataFrame = 0;
   IRDataDecode();
  }
  if(IRDecode)
  {
   IRDecode = 0;
   SegRefreshDisplayBuf();
  }
   if(Timer1IRQEvent)
  {
   Timer1IRQEvent = 0;
   SegDisplay();
  }

}
}

void Timer0Init()
{
TMOD = 0X02;
TH0 = 0X9C;//0;
TL0 = 0X9C;//0;
ET0 = 1;
TR0 = 1;
}
void Timer1Init()
{
TMOD |= 0X10; //工作方式1
TH1 = TimerHighInitValue;
TL1 = TimerLowInitValue; //定时 5ms
ET1 = 1;
TR1 = 1;
}

void INT1Init()
{
IT1 = 1;
EX1 = 1;
}

void Timer0_ISR() interrupt 1
{
IRTime++;
}
void Timer1IRQ() interrupt 3
{
TH1 = TimerHighInitValue;
TL1 = TimerLowInitValue+6;    //重装初值
Timer1IRQEvent = 1;      //T1 中断标志位

}
void INT1_ISR() interrupt 2
{

static BYTE bitnum =0;
if(StartReceive)
{

  if((120 < IRTime) && (IRTime < 140))//47 55//检测引导码
  {
   bitnum = 0;      //为什么将这行注释,就只能一次解码正确

  }

  IRData[bitnum++] = IRTime;
  IRTime = 0;

  if(bitnum == 33)
  {
   bitnum = 0;
   IRDataFrame = 1;
  }



}
else
{
  StartReceive = 1;
  IRTime = 0;
}
}

void IRDataDecode()
{
BYTE k = 1;
BYTE j;
BYTE i;
BYTE Temp;
for(j=0; j<4; j++)
{
  for(i=0; i<8; i++)
  {
   Temp = Temp >> 1;
   if(IRData[k++] >16 ) //6 //是数据“1”
   {
    Temp = Temp | 0x80;
   }

  }
  IRCode[j] = Temp;
}
IRDecode = 1;
StartReceive = 0;
}

void SegRefreshDisplayBuf()
{
SegBuf[0] = IRCode[1] %16;       //个位
SegBuf[1] = IRCode[1] /16;   //十位
SegBuf[2] = IRCode[2] %16;       //百位
SegBuf[3] = IRCode[2] /16;       //千位
}

void SegDisplay()
{
SegPort = 0xff;          //关闭所有数码管，否则会有拖影
if(CurDigit<4)
{
DigitPort = DigitSelect[CurDigit];      //确定当前字型码
SegPort = SegCode[SegBuf[CurDigit]];     //点亮一个数码管
CurDigit++;          //位数小于4，位数加一，准备下一位
}
else
CurDigit = 0;
}

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