nec译码.txt

该为NEC红外译码,实验验证成功,效率高,响应快

/ 即红外识别程序
//--------------------------------------------------
#include "sfr.h"
#include "port.h"
//--------------------------------------------------
extern bit Ready;	
extern enum State IRstate;	
extern  unchar dutycycle;
extern bit biao;
extern bit zhi;
//--------------------------------------------------
void IRint(void) interrupt 2
{   static unchar state=0;
    static unchar speed=0;
	static unchar mode=0;
	static unchar count = 0;
	static unchar recevier[4] = {0xff,0xff,0xff,0xff};
	static unchar temp = 0;
    static unchar bits = 1;
	static unchar i = 0; 
    unint time = 0;
    count++;
    if( count>= 1 )
	{
		if( count == 1 )
		{
			TL1 = 0;        // 第一个下降沿使能Timer1。
        	TH1 = 0;
       		TR1 = 1;
		}
		else 
		{
			TR1  = 0;       // 禁止Timer1,准备Timer1的值。
        	time = TH1;
        	time=(time<<8)+TL1;     // 读TIEMR1的值,看此电平的时间为多少。
			TL1  = 0;
        	TH1  = 0;
        	TR1  = 1;
		if ((count==2)&&(time<0X1Af0))//重复码的出现，返回。
			{
				count=0;
				return;
			}
		if (count<=3)      //引导码处理程序
			return;

			if(time>50&&time<10000)                      //50是十进制
			{
				if  (( time > 0x0460 )&&(time<0x590))		// 0.542ms~~0.572ms说明收到的此位为1
					temp |=bits;
					
		    	bits<<=1;
			}
			
	
			if( bits == 0)		// 收到一个字节的数据了
			{ 
				recevier[i] = temp;
				temp = 0;
				bits = 1;
				i++;
				if( i == 4)		//按一次按键产生的数据都已经收到
				{
					i = 0;
					count = 0;
					Ready = 1;