keyboard-decoding-experiments.rar_visual c

#include <at89x51.h> #include "KBCODE.H" #define LCM_RS P2_0 #define LCM_RW P2_1 //定义LCD引脚 #define LCM_E P2_2 #define LCM_Data P0 #define Busy 0x80 //用于检测LCM状态字中的Busy标识 #define Key_Data P3_2 //定义Keyboard引脚 #define Key_CLK P3_3 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 ReadStatusLCM(void); unsigned char code cdle_net[] = {"RICHMCU PS2 TEST"}; unsigned char code email[] = {"WWW.RICHMCU.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 DisplayListChar(0, 0, cdle_net); DisplayListChar(0, 1, email); 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 EX1 = 1; //开中断 EA = 1; while(1) { if(BF) Decode(KeyV); else { EA = 1; //开中断 } } } //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; } //读状态 unsigned char ReadStatusLCM(void) { LCM_Data = 0xFF; LCM_RS = 0; LCM_RW = 1; 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(); Delay5Ms(); WriteCommandLCM(0x38,0); Delay5Ms(); Delay5Ms(); WriteCommandLCM(0x38,0); Delay5Ms(); 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 >>= 1; //因键盘数据是低>>高，结合上一句所以右移一位 if(Key_Data) { 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10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 } } 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 == 1) { //如果按下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++; } else { //没有按下SHIFT 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++; } 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; default: break; } } BF = 0; //标识字符处理完了 }