基于状态机的SAA3010红外遥控接收程序

//        其实，所有遥控芯片的编码都是比较简单的（有限的状态），只要仔细分析它的编码//
//        我们完全可以用状态机的方式来处理各种可能的情况，甚至从被干扰的杂乱波形中找出正确的编码//
//        下面是基于状态机的SAA3010红外遥控接收程序示例：                         //
//--------------------------------------------------------------------------//
//                                                                          //
//                    (c) Copyright 2001－2003 xuwenjun                     //
//                            All Rights Reserved                           //
//                                    V1.00                                 //
//--------------------------------------------------------------------------//
//标　题: SAA3010遥控芯片接收程序                                           //
//文件名: ir_3010.c                                                         //
//版　本: V1.00                                                             //                                            //
//描　述: SAA3010遥控芯片接收程序                                           //
//--------------------------------------------------------------------------//
//老版本: 无                             老版本文件名:                      //
//创建人: xuwenjun                         E-mail:xuwenjun@21cn.com         //
//日　期: 03-06-14                                                          //
//描　述: SAA3010遥控芯片接收程序                                           //
//        当ykok=1时,ykcode中的数据就是接收到的遥控码(14位的最后8位)        //
//--------------------------------------------------------------------------//
//占用以下资源:                                                             //
//        1. 遥控使用外部中断0,接P3.2口                                     //
//        2. 遥控使用定时计数器1                                            //
//        3. 5.1字节data RAM                                                //
//        4. 293字节 code ROM                                               //
//--------------------------------------------------------------------------//
//声　明:                                                                   //
//        以下代码仅免费提供给学习用途，但引用或修改后必须在文件中声明出处. //
//        如用于商业用途请与作者联系.    E-mail:xuwenjun@21cn.com           //
//        有问题请mailto xuwenjun@21cn.com   欢迎与我交流!                  //
//--------------------------------------------------------------------------//

＃i nclude
#define uchar unsigned char

//  SAA3010存储定义
uchar ykcode;                                                        //遥控码(14位的最后8位)
bit ykok;                                                         //遥控数据有效标志

uchar ykbnum;                                                 //遥控已接收位数
uchar ykbtc;                                                //遥控中断时 ykbtc=TH1
uchar ykdelay;                                                //遥控延时接收
bdata uchar ykcodetemp;                                        //遥控临时码
sbit ykcodetemp0=ykcodetemp^0;

//  SAA3010端口定义
//sbit YKIO=P3^3;                                        //遥控使用外部中断0,接P3.2口

//  SAA3010函数原型: 公用函数
void YkInit(void);                                        //遥控接收初始化
unsigned char YkGetcode(void);                //返回遥控码
bit YkTest(void);                                        //检查有无遥控信号

/*
//  SAA3010函数原型: 公用函数
extern void YkInit(void);                                                //遥控接收初始化
extern unsigned char YkGetcode(void);                        //返回遥控码
extern bit YkTest(void);                                                //检查有无遥控信号
*/

/*
        //  外部引用四位LED显示模块  //
extern unsigned char code tab_duam[];                        //位映射
extern void led_send(unsigned char d);                        //发送子程序
extern void led_cls(void);                                                //清除显示
extern void led_show(unsigned int n);                        //显示数字子程序
extern void led_showhh(unsigned int n);                        //16进制显示数字子程序
extern void led_test(void);                                                //4LED测试函数
extern void led_delay(unsigned char  ms);                //延迟函数 
*/

//  SAA3010函数内容
void YkInit(void)                                        //遥控接收初始化
{
        TMOD=0x11;                                           //TMOD T0,T1均选用方式1(16位定时)
        SCON=0x00;
        TH1=0;
        TL1=0;
        IE|=0x89;                                           //SETB        EX0 0x1  外部中断 0 允许
                                                                        //SETB        ET0 0x8  定时器 1 中断允许
                                                                          //SETB        EA  0x80 开中断
        IP|=0x01;                                           //SETB  INT0 中断优先
        TCON |= 0x41;                                    //TCON  EX0下降沿触发,启动T1 //
        ykbnum=0;
        ykcodetemp=0;
        ykdelay=0;

}

unsigned char YkGetcode(void)                        //返回遥控码
{
        return(ykcode);
}

bit YkTest(void)                                        //检查有无遥控信号
{
        return(ykok);
}

void intx0() interrupt 0 using 2        //遥控使用外部中断0,接P3.2口
{
        ykbtc=TH1;TH1=0;TL1=0;TR1=1;ET1=1;
        switch(ykbnum)
        {
                case(0):
                        ykbnum=1;
                        break;
                case(1):
                        if(ykbtc==6)ykbnum=2;
                        else ykbnum=0;
                        break;
                case(2):
                        if(ykbtc==6||ykbtc==9)ykbnum=3;
                        else ykbnum=0; 
                        break;
                case(3):
                        if(ykbtc==9||ykbtc==6){ykbnum=4;}
                        else ykbnum=0;
                        break;
                default:
                        if(ykbnum<7)if(ykbtc==6)ykbnum++;
                                                else ykbnum=0;
                        else 
                        {
                                if(ykbtc==6){if(ykcodetemp0)ykcodetemp=ykcodetemp*2+1;
                                                         else ykcodetemp=ykcodetemp*2;
                                                         ykbnum++;
                                                        }
                                else if(ykbtc==9){        if(ykcodetemp0){ykbnum++;ykcodetemp=ykcodetemp*2;}  
                                                                        else {ykbnum+=2;ykcodetemp=ykcodetemp*2;ykcodetemp=ykcodetemp*2+1;}
                                                                 }
                                         else if(ykbtc>11&&ykbtc<15)
                                                        {ykbnum+=2;ykcodetemp=ykcodetemp*2;ykcodetemp=ykcodetemp*2+1;}
                                                        else if(ykbtc>30){EX0=1;}
                                                                 else ykbnum=0;                
                        }
        }
} 

void intt1() interrupt 3 using 3        //遥控使用定时计数器1
{
        if(ykdelay){ykdelay--;EX0=0;}        //ykdelay不为0暂停接收
        else
        {
                if(ykbnum==13)                                //遥控码最后一位为0,补0
                {
                        ykcode=ykcodetemp*=2;
                        ykdelay=3;
                        EX0=0;                                        //暂停接收
                        ykok=1;                                        //遥控数据有效
                }
                else if(ykbnum==14)                        //遥控码最后一位为1,不用补
                         {
                                ykcode=ykcodetemp;
                                ykdelay=3;
                                EX0=0;                                //暂停接收
                                ykok=1;                                //遥控数据有效
                         }
                         else EX0=1;                        //ykbnum不为13,14接收无效,继续接收
                ykbnum=0;
                ykcodetemp=0;
        }
}

/*
//  SAA3010测试主函数内容
main()
{
        YkInit();
        led_test();                                        //4LED测试函数
        for(;1;)                                                //主程序
        {
                if (YkTest())
                        led_showhh(YkGetcode());
                led_delay(10);
        }
}
*/