?? ps2key.lst
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C51 COMPILER V7.10 PS2KEY 04/27/2008 13:04:49 PAGE 1
C51 COMPILER V7.10, 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液晶顯示和PS/2鍵盤的示例
3 -------------------------------------------------
4
5 ==============================================================
6
7 SMC1602A(16*2)模擬口線接線方式
8 連接線圖:
9 ---------------------------------------------------
10 |LCM-----51 | LCM-----51 | LCM------51 |
11 --------------------------------------------------|
12 |DB0-----P1.0 | DB4-----P1.4 | RW-------P2.1 |
13 |DB1-----P1.1 | DB5-----P1.5 | RS-------P2.0 |
14 |DB2-----P1.2 | DB6-----P1.6 | E--------P2.2 |
15 |DB3-----P1.3 | DB7-----P1.7 | VLCD接1K電阻到GND|
16 ---------------------------------------------------
17
18 Keyboard接線
19 PS/2--------51
20 1 DATA------P3.4
21 3 GND
22 4 VCC
23 5 CLK-------P3.3 接在51的外部中斷，觸發方式為低電平
24
25
26 [注:AT89x51使用12M或11.0592M晶振,實測使用11.059M
27 [Keil uV2 7.01編譯運行通過 程序中沒有做鍵盤數據的奇偶校驗]
28
29 =============================================================*/
30 #include <at89x51.h>
31 #include "scancodes.h"
32
33 #define LCM_RW P2_1 //定義LCD引腳
34 #define LCM_RS P2_0
35 #define LCM_E P2_2
36 #define LCM_Data P0
37
38 #define Key_Data P3_4 //定義Keyboard引腳
39 #define Key_CLK P3_3
40
41 #define Busy 0x80 //用于檢測LCM狀態字中的Busy標識
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 V7.10 PS2KEY 04/27/2008 13:04:49 PAGE 2
56 unsigned char code Cls[] = {" "};
57 static unsigned char IntNum = 0; //中斷次數計數
58 static unsigned char KeyV; //鍵值
59 static unsigned char DisNum = 0; //顯示用指針
60 static unsigned char Key_UP=0, Shift = 0;//Key_UP是鍵松開標識，Shift是Shift鍵按下標識
61 static unsigned char BF = 0; //標識是否有字符被收到
62
63 void main(void)
64 {
65 1 unsigned char TempCyc;
66 1
67 1 Delay400Ms(); //啟動等待，等LCM講入工作狀態
68 1 LCMInit(); //LCM初始化
69 1 Delay5Ms(); //延時片刻(可不要)
70 1
71 1 DisplayListChar(0, 0, cdle_net);
72 1 DisplayListChar(0, 1, email);
73 1 ReadDataLCM();//測試用句無意義
74 1 for (TempCyc=0; TempCyc<10; TempCyc++)
75 1 Delay400Ms(); //延時
76 1 DisplayListChar(0, 1, Cls);
77 1
78 1 IT1 = 0; //設外部中斷1為低電平觸發
79 1 EA = 1;
80 1 EX1 = 1; //開中斷
81 1
82 1 do
83 1 {
84 2 if (BF)
85 2 Decode(KeyV);
86 2 else
87 2 EA = 1; //開中斷
88 2 }
89 1 while(1);
90 1 }
91
92 //寫數據
93 void WriteDataLCM(unsigned char WDLCM)
94 {
95 1 ReadStatusLCM(); //檢測忙
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這后加小的延時
100 1 LCM_E = 0; //延時
101 1 LCM_E = 1;
102 1 }
103
104 //寫指令
105 void WriteCommandLCM(unsigned char WCLCM,BuysC) //BuysC為0時忽略忙檢測
106 {
107 1 if (BuysC) ReadStatusLCM(); //根據需要檢測忙
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 //讀數據
117 unsigned char ReadDataLCM(void)
C51 COMPILER V7.10 PS2KEY 04/27/2008 13:04:49 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 //讀狀態
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); //檢測忙信號
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); //三次顯示模式設置，不檢測忙信號
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); //顯示模式設置,開始要求每次檢測忙信號
151 1 WriteCommandLCM(0x08,1); //關閉顯示
152 1 WriteCommandLCM(0x01,1); //顯示清屏
153 1 WriteCommandLCM(0x06,1); // 顯示光標移動設置
154 1 WriteCommandLCM(0x0F,1); // 顯示開及光標設置
155 1 }
156
157 //按指定位置顯示一個字符
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; //當要顯示第二行時地址碼+0x40;
163 1 X |= 0x80; //算出指令碼
164 1 WriteCommandLCM(X, 1); //發命令字
165 1 WriteDataLCM(DData); //發數據
166 1 }
167
168 //按指定位置顯示一串字符
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) //若到達字串尾則退出
177 1 {
178 2 if (X <= 0xF) //X坐標應小于0xF
179 2 {
C51 COMPILER V7.10 PS2KEY 04/27/2008 13:04:49 PAGE 4
180 3 DisplayOneChar(X, Y, DData[ListLength]); //顯示單個字符
181 3 ListLength++;
182 3 X++;
183 3 }
184 2 }
185 1 }
186
187 //5ms延時
188 void Delay5Ms(void)
189 {
190 1 unsigned int TempCyc = 5552;
191 1 while(TempCyc--);
192 1 }
193
194 //400ms延時
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; //因鍵盤數據是低>>高，結合上一句所以右移一位
211 2 if (Key_Data) KeyV = KeyV | 0x80; //當鍵盤數據線為1時為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; //當中斷11次后表示一幀數據收完，清變量準備下一次接收
219 2 BF = 1; //標識有字符輸入完了
220 2 EA = 0; //關中斷等顯示完后再開中斷 (注：如這里不用BF和關中斷直接調Decode()則所Decode中所調用的所有函數?? 快捷鍵說明
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