单片机与104键PS2接口标准键盘程序

/*============================================================ 使用1602液晶显示和PS/2键盘的示例 ------------------------------------------------- ============================================================== SMC1602A(16*2)模拟口线接线方式 连接线图: --------------------------------------------------- |LCM-----51 | LCM-----51 | LCM------51 | --------------------------------------------------| |DB0-----P1.0 | DB4-----P1.4 | RW-------P2.1 | |DB1-----P1.1 | DB5-----P1.5 | RS-------P2.0 | |DB2-----P1.2 | DB6-----P1.6 | E--------P2.2 | |DB3-----P1.3 | DB7-----P1.7 | VLCD接1K电阻到GND| --------------------------------------------------- Keyboard接线 PS/2--------51 1 DATA------P3.4 3 GND 4 VCC 5 CLK-------P3.3 接在51的外部中断，触发方式为低电平 [注:AT89x51使用12M或11.0592M晶振,实测使用11.059M [Keil uV2 7.01编译运行通过 程序中没有做键盘数据的奇偶校验] =============================================================*/ #include <at89x51.h> #include "scancodes.h" #define LCM_RW P2_1 //定义LCD引脚 #define LCM_RS P2_0 #define LCM_E P2_2 #define LCM_Data P0 #define Key_Data P3_4 //定义Keyboard引脚 #define Key_CLK P3_3 #define Busy 0x80 //用于检测LCM状态字中的Busy标识 void LCMInit(void); void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData); void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData); void Delay5Ms(void); void Delay400Ms(void); void Decode(unsigned char ScanCode); void WriteDataLCM(unsigned char WDLCM); void WriteCommandLCM(unsigned char WCLCM,BuysC); unsigned char ReadDataLCM(void); unsigned char ReadStatusLCM(void); unsigned char code cdle_net[] = {" www.saxmcu.com "}; unsigned char code email[] = {"saxmcu@126.com"}; unsigned char code Cls[] = {" "}; static unsigned char IntNum = 0; //中断次数计数 static unsigned char KeyV; //键值 static unsigned char DisNum = 0; //显示用指针 static unsigned char Key_UP=0, Shift = 0;//Key_UP是键松开标识，Shift是Shift键按下标识 static unsigned char BF = 0; //标识是否有字符被收到 void main(void) { unsigned char TempCyc; Delay400Ms(); //启动等待，等LCM讲入工作状态 LCMInit(); //LCM初始化 Delay5Ms(); //延时片刻(可不要) DisplayListChar(0, 0, cdle_net); DisplayListChar(0, 1, email); ReadDataLCM();//测试用句无意义 for (TempCyc=0; TempCyc<10; TempCyc++) Delay400Ms(); //延时 DisplayListChar(0, 1, Cls); IT1 = 0; //设外部中断1为低电平触发 EA = 1; EX1 = 1; //开中断 do { if (BF) Decode(KeyV); else EA = 1; //开中断 } while(1); } //写数据 void WriteDataLCM(unsigned char WDLCM) { ReadStatusLCM(); //检测忙 LCM_Data = WDLCM; LCM_RS = 1; LCM_RW = 0; LCM_E = 0; //若晶振速度太高可以在这后加小的延时 LCM_E = 0; //延时 LCM_E = 1; } //写指令 void WriteCommandLCM(unsigned char WCLCM,BuysC) //BuysC为0时忽略忙检测 { if (BuysC) ReadStatusLCM(); //根据需要检测忙 LCM_Data = WCLCM; LCM_RS = 0; LCM_RW = 0; LCM_E = 0; LCM_E = 0; LCM_E = 1; } //读数据 unsigned char ReadDataLCM(void) { LCM_RS = 1; LCM_RW = 1; LCM_E = 0; LCM_E = 0; LCM_E = 1; return(LCM_Data); } //读状态 unsigned char ReadStatusLCM(void) { LCM_Data = 0xFF; LCM_RS = 0; LCM_RW = 1; LCM_E = 0; LCM_E = 0; LCM_E = 1; while (LCM_Data & Busy); //检测忙信号 return(LCM_Data); } void LCMInit(void) //LCM初始化 { LCM_Data = 0; WriteCommandLCM(0x38,0); //三次显示模式设置，不检测忙信号 Delay5Ms(); WriteCommandLCM(0x38,0); Delay5Ms(); WriteCommandLCM(0x38,0); Delay5Ms(); WriteCommandLCM(0x38,1); //显示模式设置,开始要求每次检测忙信号 WriteCommandLCM(0x08,1); //关闭显示 WriteCommandLCM(0x01,1); //显示清屏 WriteCommandLCM(0x06,1); // 显示光标移动设置 WriteCommandLCM(0x0F,1); // 显示开及光标设置 } //按指定位置显示一个字符 void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData) { Y &= 0x1; X &= 0xF; //限制X不能大于15，Y不能大于1 if (Y) X |= 0x40; //当要显示第二行时地址码+0x40; X |= 0x80; //算出指令码 WriteCommandLCM(X, 1); //发命令字 WriteDataLCM(DData); //发数据 } //按指定位置显示一串字符 void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData) { unsigned char ListLength; ListLength = 0; Y &= 0x1; X &= 0xF; //限制X不能大于15，Y不能大于1 while (DData[ListLength]>0x19) //若到达字串尾则退出 { if (X <= 0xF) //X坐标应小于0xF { DisplayOneChar(X, Y, DData[ListLength]); //显示单个字符 ListLength++; X++; } } } //5ms延时 void Delay5Ms(void) { unsigned int TempCyc = 5552; while(TempCyc--); } //400ms延时 void Delay400Ms(void) { unsigned char TempCycA = 5; unsigned int TempCycB; while(TempCycA--) { TempCycB=7269; while(TempCycB--); }; } void Keyboard_out(void) interrupt 2 { if ((IntNum > 0) && (IntNum < 9)) { KeyV = KeyV >> 1; //因键盘数据是低>>高，结合上一句所以右移一位 if (Key_Data) KeyV = KeyV | 0x80; //当键盘数据线为1时为1到最高位 } IntNum++; while (!Key_CLK); //等待PS/2CLK拉高 if (IntNum > 10) { IntNum = 0; //当中断11次后表示一帧数据收完，清变量准备下一次接收 BF = 1; //标识有字符输入完了 EA = 0; //关中断等显示完后再开中断 (注：如这里不用BF和关中断直接调Decode()则所Decode中所调用的所有函数要声明为再入函数) } } void Decode(unsigned char ScanCode) //注意:如SHIFT+G为12H 34H F0H 34H F0H 12H，也就是说shift的通码+G的通码+shift的断码+G的断码 { unsigned char TempCyc; if (!Key_UP) //当键盘松开时 { switch (ScanCode) { case 0xF0 : // 当收到0xF0，Key_UP置1表示断码开始 Key_UP = 1; break; case 0x12 : // 左 SHIFT Shift = 1; break; case 0x59 : // 右 SHIFT Shift = 1; break; default: if (DisNum > 15) { DisplayListChar(0, 1, Cls);//清LCD第二行 DisNum = 0; } if(!Shift) //如果SHIFT没按下 { for (TempCyc = 0;(UnShifted[TempCyc][0]!=ScanCode)&&(TempCyc<59); TempCyc++); //查表显示 if (UnShifted[TempCyc][0] == ScanCode) DisplayOneChar(DisNum, 1, UnShifted[TempCyc][1]); DisNum++; } else //按下SHIFT { for(TempCyc = 0; (Shifted[TempCyc][0]!=ScanCode)&&(TempCyc<59); TempCyc++); //查表显示 if (Shifted[TempCyc][0] == ScanCode) DisplayOneChar(DisNum, 1, Shifted[TempCyc][1]); DisNum++; } break; } } else { Key_UP = 0; switch (ScanCode) //当键松开时不处理判码，如G 34H F0H 34H 那么第二个34H不会被处理 { case 0x12 : // 左 SHIFT Shift = 0; break; case 0x59 : // 右 SHIFT Shift = 0; break; } } BF = 0; //标识字符处理完了 }