📄 ps2key.lst
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C51 COMPILER V8.02 PS2KEY 07/17/2008 21:01:34 PAGE 1
C51 COMPILER V8.02, COMPILATION OF MODULE PS2KEY
OBJECT MODULE PLACED IN PS2Key.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE PS2Key.c BROWSE DEBUG OBJECTEXTEND
line level source
1 /*============================================================
2 使用1602液晶显示和PS/2键盘的示例
3 -------------------------------------------------
4
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-----P0.0 | DB4-----P0.4 | RW-------P1.3 |
13 |DB1-----P0.1 | DB5-----P0.5 | RS-------P1.4 |
14 |DB2-----P0.2 | DB6-----P0.6 | E--------P1.2 |
15 |DB3-----P0.3 | DB7-----P0.7 | 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
26 [注:AT89x51使用12M或11.0592M晶振,实测使用11.059M
27 [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]
28
29 =============================================================*/
30 #include <at89x51.h>
31 #include "scancodes.h"
32
33 #define LCM_RW P1_3 //定义LCD引脚
34 #define LCM_RS P1_4
35 #define LCM_E P1_2
36 #define LCM_Data P0
37
38 #define Key_Data P3_4 //定义Keyboard引脚
39 #define Key_CLK P3_3
40
41 #define Busy 0x80 //用于检测LCM状态字中的Busy标识
42
43 void LCMInit(void);
44 void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData);
45 void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData);
46 void Delay5Ms(void);
47 void Delay400Ms(void);
48 void Decode(unsigned char ScanCode);
49 void WriteDataLCM(unsigned char WDLCM);
50 void WriteCommandLCM(unsigned char WCLCM,BuysC);
51
52 unsigned char ReadDataLCM(void);
53 unsigned char ReadStatusLCM(void);
54 unsigned char code cdle_net[] = {" www.pp51.com "};
55 unsigned char code email[] = {"pp51com@163.com"};
C51 COMPILER V8.02 PS2KEY 07/17/2008 21:01:34 PAGE 2
56 unsigned char code Cls[] = {" "};
57 static unsigned char IntNum = 0; //中断次数计数
58 static unsigned char KeyV; //键值
59 static unsigned char DisNum = 0; //显示用指针
60 static unsigned char Key_UP=0, Shift = 0;//Key_UP是键松开标识，Shift是Shift键按下标识
61 static unsigned char BF = 0; //标识是否有字符被收到
62
63 void main(void)
64 {
65 1 unsigned char TempCyc;
66 1
67 1 Delay400Ms(); //启动等待，等LCM讲入工作状态
68 1 LCMInit(); //LCM初始化
69 1 Delay5Ms(); //延时片刻(可不要)
70 1
71 1 DisplayListChar(0, 0, cdle_net);
72 1 DisplayListChar(0, 1, email);
73 1 ReadDataLCM();//测试用句无意义
74 1 for (TempCyc=0; TempCyc<10; TempCyc++)
75 1 Delay400Ms(); //延时
76 1 DisplayListChar(0, 1, Cls);
77 1
78 1 IT1 = 0; //设外部中断1为低电平触发
79 1 EA = 1;
80 1 EX1 = 1; //开中断
81 1
82 1 do
83 1 {
84 2 if (BF)
85 2 Decode(KeyV);
86 2 else
87 2 EA = 1; //开中断
88 2 }
89 1 while(1);
90 1 }
91
92 //写数据
93 void WriteDataLCM(unsigned char WDLCM)
94 {
95 1 ReadStatusLCM(); //检测忙
96 1 LCM_Data = WDLCM;
97 1 LCM_RS = 1;
98 1 LCM_RW = 0;
99 1 LCM_E = 0; //若晶振速度太高可以在这后加小的延时
100 1 LCM_E = 0; //延时
101 1 LCM_E = 1;
102 1 }
103
104 //写指令
105 void WriteCommandLCM(unsigned char WCLCM,BuysC) //BuysC为0时忽略忙检测
106 {
107 1 if (BuysC) ReadStatusLCM(); //根据需要检测忙
108 1 LCM_Data = WCLCM;
109 1 LCM_RS = 0;
110 1 LCM_RW = 0;
111 1 LCM_E = 0;
112 1 LCM_E = 0;
113 1 LCM_E = 1;
114 1 }
115
116 //读数据
117 unsigned char ReadDataLCM(void)
C51 COMPILER V8.02 PS2KEY 07/17/2008 21:01:34 PAGE 3
118 {
119 1 LCM_RS = 1;
120 1 LCM_RW = 1;
121 1 LCM_E = 0;
122 1 LCM_E = 0;
123 1 LCM_E = 1;
124 1 return(LCM_Data);
125 1 }
126
127 //读状态
128 unsigned char ReadStatusLCM(void)
129 {
130 1 LCM_Data = 0xFF;
131 1 LCM_RS = 0;
132 1 LCM_RW = 1;
133 1 LCM_E = 0;
134 1 LCM_E = 0;
135 1 LCM_E = 1;
136 1 while (LCM_Data & Busy); //检测忙信号
137 1 return(LCM_Data);
138 1 }
139
140 void LCMInit(void) //LCM初始化
141 {
142 1 LCM_Data = 0;
143 1 WriteCommandLCM(0x38,0); //三次显示模式设置，不检测忙信号
144 1 Delay5Ms();
145 1 WriteCommandLCM(0x38,0);
146 1 Delay5Ms();
147 1 WriteCommandLCM(0x38,0);
148 1 Delay5Ms();
149 1
150 1 WriteCommandLCM(0x38,1); //显示模式设置,开始要求每次检测忙信号
151 1 WriteCommandLCM(0x08,1); //关闭显示
152 1 WriteCommandLCM(0x01,1); //显示清屏
153 1 WriteCommandLCM(0x06,1); // 显示光标移动设置
154 1 WriteCommandLCM(0x0F,1); // 显示开及光标设置
155 1 }
156
157 //按指定位置显示一个字符
158 void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData)
159 {
160 1 Y &= 0x1;
161 1 X &= 0xF; //限制X不能大于15，Y不能大于1
162 1 if (Y) X |= 0x40; //当要显示第二行时地址码+0x40;
163 1 X |= 0x80; //算出指令码
164 1 WriteCommandLCM(X, 1); //发命令字
165 1 WriteDataLCM(DData); //发数据
166 1 }
167
168 //按指定位置显示一串字符
169 void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData)
170 {
171 1 unsigned char ListLength;
172 1
173 1 ListLength = 0;
174 1 Y &= 0x1;
175 1 X &= 0xF; //限制X不能大于15，Y不能大于1
176 1 while (DData[ListLength]>0x19) //若到达字串尾则退出
177 1 {
178 2 if (X <= 0xF) //X坐标应小于0xF
179 2 {
C51 COMPILER V8.02 PS2KEY 07/17/2008 21:01:34 PAGE 4
180 3 DisplayOneChar(X, Y, DData[ListLength]); //显示单个字符
181 3 ListLength++;
182 3 X++;
183 3 }
184 2 }
185 1 }
186
187 //5ms延时
188 void Delay5Ms(void)
189 {
190 1 unsigned int TempCyc = 5552;
191 1 while(TempCyc--);
192 1 }
193
194 //400ms延时
195 void Delay400Ms(void)
196 {
197 1 unsigned char TempCycA = 5;
198 1 unsigned int TempCycB;
199 1 while(TempCycA--)
200 1 {
201 2 TempCycB=7269;
202 2 while(TempCycB--);
203 2 };
204 1 }
205
206 void Keyboard_out(void) interrupt 2
207 {
208 1 if ((IntNum > 0) && (IntNum < 9))
209 1 {
210 2 KeyV = KeyV >> 1; //因键盘数据是低>>高，结合上一句所以右移一位
211 2 if (Key_Data) KeyV = KeyV | 0x80; //当键盘数据线为1时为1到最高位
212 2 }
213 1 IntNum++;
214 1 while (!Key_CLK); //等待PS/2CLK拉高
215 1
216 1 if (IntNum > 10)
217 1 {
218 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
219 2 BF = 1; //标识有字符输入完了
220 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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