AVR CH451驱动程序

    }
    CH451_LOAD_HIGH;                      //加载数据
}  
//CH451初始化函数
void CH451_Init(){
    CH451_DIN_LOW;                   //低电平使能串行接口
    CH451_DIN_HIGH;
    CH451_WriteCommand(CH451_RESET); //复位CH451
    CH451_WriteCommand(CH451_SYSON2);//开显示、键盘
    DDRE&=~DOUT;                     //PE5输入方向
    EICRB|=(1<<ISC51);               //PE5下降沿触发中断
    EIMSK|=(1<<INT5);                //PE5开外部中断

}
//CH451键值读取函数
void CH451_GetKeyValue(){
    uchar i;
    uchar GetKeyValue=0x00;           //键盘代码
    CH451_WriteCommand(CH451_KEY);    //发送读取键值命令
    for(i=0;i<7;i++){
        GetKeyValue<<=1;
        if(CH451_DOUT) GetKeyValue|=1;//从高到低读入451的数据
        else GetKeyValue|=0;
        CH451_DCLK_LOW;               //下降沿有效
        CH451_DCLK_HIGH;
    }
    if(GetKeyValue==0x00) return;     //读出键码为0跳过
    for(i=0;i<16;i++){                //查找键盘代码对应的键值
        if(GetKeyValue==KeyCode){
     KeyValue=i;
     break;
}
    }
}
//CH451显示一位数码管，DIG选择数码管，Data要显示的数字，Point是否显示小数点
void CH451_DisplayDig(uchar DIG,uchar Data,uchar Point){
    if(Point==1) CH451_WriteCommand(DigCode[DIG]|(DSYCode[Data]|0x80));
    else CH451_WriteCommand(DigCode[DIG]|DSYCode[Data]);
} 

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