SMC1602A(16*2)模拟口线接线方式
连接线图:
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|LCM-----51 | LCM-----51 | LCM------51 |
|-------------|--------------|------------------|
|DB0-----P1.0 | DB4-----P1.4 | RW-------P2.0 |
|DB1-----P1.1 | DB5-----P1.5 | RS-------P2.1 |
|DB2-----P1.2 | DB6-----P1.6 | E--------P2.2 |
|DB3-----P1.3 | DB7-----P1.7 | VLCD接1K电阻到GND|
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PS/2的电气特性如下(电脑端):
Keyboard接线
PS/2--------51单片机
1 DATA------P3.4
2 不接
3 GND
4 VCC
5 CLK-------P3.3 接在51的外部中断,触发方式为低电平
6 不接
本程序源码只供学习参考,不得应用于商业用途,如有需要请联系作者。
[注:AT89x51使用12M或11.0592M晶振,实测使用11.0592M]
[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]
[站长在AT89S51+12M晶振+JHD 162A液晶上调试通过]
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 | #include "reg51.h" #include "scancodes.h" #define LCM_RW P2_0//定义LCD引脚 #define LCM_RS P2_1 #define LCM_E P2_2 #define LCM_Data P1 #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.cdle.net--" }; unsigned char code email[] = { "pnzwzw@cdle.net" }; 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 (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 } 以下为 scancodes.h 文件 unsigned char code UnShifted[59][2] = { 0x1C, 'a' , 0x32, 'b' , 0x21, 'c' , 0x23, 'd' , 0x24, 'e' , 0x2B, 'f' , 0x34, 'g' , 0x33, 'h' , 0x43, 'i' , 0x3B, 'j' , 0x42, 'k' , 0x4B, 'l' , 0x3A, 'm' , 0x31, 'n' , 0x44, 'o' , 0x4D, 'p' , 0x15, 'q' , 0x2D, 'r' , 0x1B, 's' , 0x2C, 't' , 0x3C, 'u' , 0x2A, 'v' , 0x1D, 'w' , 0x22, 'x' , 0x35, 'y' , 0x1A, 'z' , 0x45, '0' , 0x16, '1' , 0x1E, '2' , 0x26, '3' , 0x25, '4' , 0x2E, '5' , 0x36, '6' , 0x3D, '7' , 0x3E, '8' , 0x46, '9' , 0x0E, '`' , 0x4E, '-' , 0x55, '=' , 0x5D, '\\' , 0x29, ' ' , 0x54, '[' , 0x5B, ']' , 0x4C, ';' , 0x52, '\'' , 0x41, ',' , 0x49, '.' , 0x4A, '/' , 0x71, '.' , 0x70, '0' , 0x69, '1' , 0x72, '2' , 0x7A, '3' , 0x6B, '4' , 0x73, '5' , 0x74, '6' , 0x6C, '7' , 0x75, '8' , 0x7D, '9' , }; unsigned char code Shifted[59][2] = { 0x1C, 'A' , 0x32, 'B' , 0x21, 'C' , 0x23, 'D' , 0x24, 'E' , 0x2B, 'F' , 0x34, 'G' , 0x33, 'H' , 0x43, 'I' , 0x3B, 'J' , 0x42, 'K' , 0x4B, 'L' , 0x3A, 'M' , 0x31, 'N' , 0x44, 'O' , 0x4D, 'P' , 0x15, 'Q' , 0x2D, 'R' , 0x1B, 'S' , 0x2C, 'T' , 0x3C, 'U' , 0x2A, 'V' , 0x1D, 'W' , 0x22, 'X' , 0x35, 'Y' , 0x1A, 'Z' , 0x45, '0' , 0x16, '1' , 0x1E, '2' , 0x26, '3' , 0x25, '4' , 0x2E, '5' , 0x36, '6' , 0x3D, '7' , 0x3E, '8' , 0x46, '9' , 0x0E, '~' , 0x4E, '_' , 0x55, '+' , 0x5D, '|' , 0x29, ' ' , 0x54, '{' , 0x5B, '}' , 0x4C, ':' , 0x52, '"' , 0x41, '<' , 0x49, '>' , 0x4A, '?' , 0x71, '.' , 0x70, '0' , 0x69, '1' , 0x72, '2' , 0x7A, '3' , 0x6B, '4' , 0x73, '5' , 0x74, '6' , 0x6C, '7' , 0x75, '8' , 0x7D, '9' , }; |