📄 ps2key.lst
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C51 COMPILER V6.12 PS2KEY 04/12/2006 14:55:23 PAGE 1
C51 COMPILER V6.12, COMPILATION OF MODULE PS2KEY
OBJECT MODULE PLACED IN .\PS2Key.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE .\PS2Key.c BROWSE DEBUG OBJECTEXTEND
stmt level source
1 /*============================================================
2 使用1602液晶显示和PS/2键盘的示例 明浩 2004/2
3 -------------------------------------------------
4 http://www.cdle.net http://bbs.cdle.net
5 ==============================================================
6
7 SMC1602A(16*2)模拟口线接线方式
8 连接线图:
9 ---------------------------------------------------
10 |LCM-----51 | LCM-----51 | LCM------51 |
11 --------------------------------------------------|
12 |DB0-----P1.0 | DB4-----P1.4 | RW-------P2.0 |
13 |DB1-----P1.1 | DB5-----P1.5 | RS-------P2.1 |
14 |DB2-----P1.2 | DB6-----P1.6 | E--------P2.2 |
15 |DB3-----P1.3 | DB7-----P1.7 | VLCD接1K电阻到GND|
16 ---------------------------------------------------
17
18 Keyboard接线
19 PS/2--------51
20 1 DATA------P3.4
21 3 GND
22 4 VCC
23 5 CLK-------P3.3 接在51的外部中断，触发方式为低电平
24
25 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。
26
27 [注:AT89x51使用12M或11.0592M晶振,实测使用11.0592M]
28 [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]
29
30 =============================================================*/
31 #include <at89x51.h>
32 #include "scancodes.h"
33
34 #define LCM_RW P2_0 //定义LCD引脚
35 #define LCM_RS P2_1
36 #define LCM_E P2_2
37 #define LCM_Data P1
38
39 #define Key_Data P3_4 //定义Keyboard引脚
40 #define Key_CLK P3_3
41
42 #define Busy 0x80 //用于检测LCM状态字中的Busy标识
43
44 void LCMInit(void);
45 void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData);
46 void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData);
47 void Delay5Ms(void);
48 void Delay400Ms(void);
49 void Decode(unsigned char ScanCode);
50 void WriteDataLCM(unsigned char WDLCM);
51 void WriteCommandLCM(unsigned char WCLCM,BuysC);
52
53 unsigned char ReadDataLCM(void);
54 unsigned char ReadStatusLCM(void);
55 unsigned char code cdle_net[] = {"--www.cdle.net--"};
C51 COMPILER V6.12 PS2KEY 04/12/2006 14:55:23 PAGE 2
56 unsigned char code email[] = {"pnzwzw@cdle.net"};
57 unsigned char code Cls[] = {" "};
58 static unsigned char IntNum = 0; //中断次数计数
59 static unsigned char KeyV; //键值
60 static unsigned char DisNum = 0; //显示用指针
61 static unsigned char Key_UP=0, Shift = 0;//Key_UP是键松开标识，Shift是Shift键按下标识
62 static unsigned char BF = 0; //标识是否有字符被收到
63
64 void main(void)
65 {
66 1 unsigned char TempCyc;
67 1
68 1 Delay400Ms(); //启动等待，等LCM讲入工作状态
69 1 LCMInit(); //LCM初始化
70 1 Delay5Ms(); //延时片刻(可不要)
71 1
72 1 DisplayListChar(0, 0, cdle_net);
73 1 DisplayListChar(0, 1, email);
74 1 ReadDataLCM();//测试用句无意义
75 1 for (TempCyc=0; TempCyc<10; TempCyc++)
76 1 Delay400Ms(); //延时
77 1 DisplayListChar(0, 1, Cls);
78 1
79 1 IT1 = 0; //设外部中断1为低电平触发
80 1 EA = 1;
81 1 EX1 = 1; //开中断
82 1
83 1 do
84 1 {
85 2 if (BF)
86 2 Decode(KeyV);
87 2 else
88 2 EA = 1; //开中断
89 2 }
90 1 while(1);
91 1 }
92
93 //写数据
94 void WriteDataLCM(unsigned char WDLCM)
95 {
96 1 ReadStatusLCM(); //检测忙
97 1 LCM_Data = WDLCM;
98 1 LCM_RS = 1;
99 1 LCM_RW = 0;
100 1 LCM_E = 0; //若晶振速度太高可以在这后加小的延时
101 1 LCM_E = 0; //延时
102 1 LCM_E = 1;
103 1 }
104
105 //写指令
106 void WriteCommandLCM(unsigned char WCLCM,BuysC) //BuysC为0时忽略忙检测
107 {
108 1 if (BuysC) ReadStatusLCM(); //根据需要检测忙
109 1 LCM_Data = WCLCM;
110 1 LCM_RS = 0;
111 1 LCM_RW = 0;
112 1 LCM_E = 0;
113 1 LCM_E = 0;
114 1 LCM_E = 1;
115 1 }
116
117 //读数据
C51 COMPILER V6.12 PS2KEY 04/12/2006 14:55:23 PAGE 3
118 unsigned char ReadDataLCM(void)
119 {
120 1 LCM_RS = 1;
121 1 LCM_RW = 1;
122 1 LCM_E = 0;
123 1 LCM_E = 0;
124 1 LCM_E = 1;
125 1 return(LCM_Data);
126 1 }
127
128 //读状态
129 unsigned char ReadStatusLCM(void)
130 {
131 1 LCM_Data = 0xFF;
132 1 LCM_RS = 0;
133 1 LCM_RW = 1;
134 1 LCM_E = 0;
135 1 LCM_E = 0;
136 1 LCM_E = 1;
137 1 while (LCM_Data & Busy); //检测忙信号
138 1 return(LCM_Data);
139 1 }
140
141 void LCMInit(void) //LCM初始化
142 {
143 1 LCM_Data = 0;
144 1 WriteCommandLCM(0x38,0); //三次显示模式设置，不检测忙信号
145 1 Delay5Ms();
146 1 WriteCommandLCM(0x38,0);
147 1 Delay5Ms();
148 1 WriteCommandLCM(0x38,0);
149 1 Delay5Ms();
150 1
151 1 WriteCommandLCM(0x38,1); //显示模式设置,开始要求每次检测忙信号
152 1 WriteCommandLCM(0x08,1); //关闭显示
153 1 WriteCommandLCM(0x01,1); //显示清屏
154 1 WriteCommandLCM(0x06,1); // 显示光标移动设置
155 1 WriteCommandLCM(0x0F,1); // 显示开及光标设置
156 1 }
157
158 //按指定位置显示一个字符
159 void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData)
160 {
161 1 Y &= 0x1;
162 1 X &= 0xF; //限制X不能大于15，Y不能大于1
163 1 if (Y) X |= 0x40; //当要显示第二行时地址码+0x40;
164 1 X |= 0x80; //算出指令码
165 1 WriteCommandLCM(X, 1); //发命令字
166 1 WriteDataLCM(DData); //发数据
167 1 }
168
169 //按指定位置显示一串字符
170 void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData)
171 {
172 1 unsigned char ListLength;
173 1
174 1 ListLength = 0;
175 1 Y &= 0x1;
176 1 X &= 0xF; //限制X不能大于15，Y不能大于1
177 1 while (DData[ListLength]>0x19) //若到达字串尾则退出
178 1 {
179 2 if (X <= 0xF) //X坐标应小于0xF
C51 COMPILER V6.12 PS2KEY 04/12/2006 14:55:23 PAGE 4
180 2 {
181 3 DisplayOneChar(X, Y, DData[ListLength]); //显示单个字符
182 3 ListLength++;
183 3 X++;
184 3 }
185 2 }
186 1 }
187
188 //5ms延时
189 void Delay5Ms(void)
190 {
191 1 unsigned int TempCyc = 5552;
192 1 while(TempCyc--);
193 1 }
194
195 //400ms延时
196 void Delay400Ms(void)
197 {
198 1 unsigned char TempCycA = 5;
199 1 unsigned int TempCycB;
200 1 while(TempCycA--)
201 1 {
202 2 TempCycB=7269;
203 2 while(TempCycB--);
204 2 };
205 1 }
206
207 void Keyboard_out(void) interrupt 2
208 {
209 1 if ((IntNum > 0) && (IntNum < 9))
210 1 {
211 2 KeyV = KeyV >> 1; //因键盘数据是低>>高，结合上一句所以右移一位
212 2 if (Key_Data) KeyV = KeyV | 0x80; //当键盘数据线为1时为1到最高位
213 2 }
214 1 IntNum++;
215 1 while (!Key_CLK); //等待PS/2CLK拉高
216 1
217 1 if (IntNum > 10)
218 1 {
219 2 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
220 2 BF = 1; //标识有字符输入完了
221 2 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⌨️ 快捷键说明
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