4x4 矩阵键盘

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#define KEYIO PT1AD0#define KEYIODDR DDR0AD0//=================== 按键扫描 ======================uchar KeyScan(void) {    uchar keyValue = 0;        KEYIODDR = 0xFF;   //初始化 AD[15:8]输出     KEYIO = 0xF0;      //列=高电平 行=低电平      delay_ms(1);               KEYIODDR = 0xF0;   //AD[15:12]输出 AD[11:8]输入  扫描行值       delay_ms(1);      if(KEYIO != 0xF0)     {         KEYIO = 0xF0;      //列=高电平 行=低电平              delay_ms(10);                       if(KEYIO != 0xF0)         {            keyValue = KEYIO & 0x0F;    //保存行值                       delay_ms(1);             KEYIODDR = 0xFF;    //初始化 AD[15:8 ]输出            KEYIO = 0x0F;       //列=低电平 行=高电平                        delay_ms(1);                                    KEYIODDR = 0x0F;   //AD[15:12]输入 AD[11:8]输出 扫描列值                           delay_ms(1);                                        keyValue |= (KEYIO & 0xF0); //合并行列值                        KEYIO = 0x0F;       //列=低电平 行=高电平             delay_ms(1);            while(KEYIO != 0x0F);  //等待按键释放                        switch(keyValue)             {              case 0x88: keyValue = 0x01;break;              case 0x84: keyValue = 0x02;break;              case 0x82: keyValue = 0x03;break;              case 0x81: keyValue = 0x0A;break;              case 0x48: keyValue = 0x04;break;              case 0x44: keyValue = 0x05;break;              case 0x42: keyValue = 0x06;break;              case 0x41: keyValue = 0x0B;break;              case 0x28: keyValue = 0x07;break;              case 0x24: keyValue = 0x08;break;              case 0x22: keyValue = 0x09;break;              case 0x21: keyValue = 0x0C;break;              case 0x18: keyValue = 0x0E;break;              case 0x14: keyValue = 0x00;break;              case 0x12: keyValue = 0x0F;break;              case 0x11: keyValue = 0x0D;break;              default: keyValue=0;break;                   }                        return (keyValue + 1);           }    }      return keyValue;}