📄 模拟串口.lst
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C51 COMPILER V7.00 腳拟串__ 04/12/2009 16:27:25 PAGE 1
C51 COMPILER V7.00, COMPILATION OF MODULE 腳拟串__
OBJECT MODULE PLACED IN 模拟串口.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE 模拟串口.c BROWSE DEBUG OBJECTEXTEND
stmt level source
1 #include <AT89x52.H>
2 sbit BT_SND =P1^0;
3 sbit BT_REC =P1^1;
4 /**********************************************
5
6 IO 口模拟232通讯程序
7
8 使用两种方式的C程序 占用定时器0
9
10 **********************************************/
11
12 #define MODE_QUICK
13
14 #define F_TM F0
15
16 #define TIMER0_ENABLE TL0=TH0; TR0=1;
17 #define TIMER0_DISABLE TR0=0;
18
19 sbit ACC0= ACC^0;
20 sbit ACC1= ACC^1;
21 sbit ACC2= ACC^2;
22 sbit ACC3= ACC^3;
23 sbit ACC4= ACC^4;
24 sbit ACC5= ACC^5;
25 sbit ACC6= ACC^6;
26 sbit ACC7= ACC^7;
27
28 void IntTimer0() interrupt 1
29 {
30 1 F_TM=1;
31 1 }
32 //发送一个字符
33 void PSendChar(unsigned char inch)
34 {
35 1 #ifdef MODE_QUICK
36 1 ACC=inch;
37 1
38 1 F_TM=0;
39 1 BT_SND=0; //start bit
40 1 TIMER0_ENABLE; //启动
41 1 while(!F_TM);
42 1
43 1 BT_SND=ACC0; //先送出低位
44 1 F_TM=0;
45 1 while(!F_TM);
46 1
47 1 BT_SND=ACC1;
48 1 F_TM=0;
49 1 while(!F_TM);
50 1
51 1 BT_SND=ACC2;
52 1 F_TM=0;
53 1 while(!F_TM);
54 1
55 1 BT_SND=ACC3;
C51 COMPILER V7.00 腳拟串__ 04/12/2009 16:27:25 PAGE 2
56 1 F_TM=0;
57 1 while(!F_TM);
58 1
59 1 BT_SND=ACC4;
60 1 F_TM=0;
61 1 while(!F_TM);
62 1
63 1 BT_SND=ACC5;
64 1 F_TM=0;
65 1 while(!F_TM);
66 1
67 1 BT_SND=ACC6;
68 1 F_TM=0;
69 1 while(!F_TM);
70 1
71 1 BT_SND=ACC7;
72 1 F_TM=0;
73 1 while(!F_TM);
74 1
75 1 BT_SND=1;
76 1 F_TM=0;
77 1 while(!F_TM);
78 1
79 1
80 1 TIMER0_DISABLE; //停止timer
81 1 #else
unsigned char ii;
ii=0;
F_TM=0;
BT_SND=0; //start bit
TIMER0_ENABLE; //启动
while(!F_TM);
while(ii<8)
{
if(inch&1)
{
BT_SND=1;
}
else
{
BT_SND=0;
}
F_TM=0;
while(!F_TM);
ii++;
inch>>=1;
}
BT_SND=1;
F_TM=0;
while(!F_TM);
#endif
111 1 TIMER0_DISABLE; //停止timer
112 1 }
113 //接收一个字符
114 unsigned char PGetChar()
115 {
116 1 #ifdef MODE_QUICK
117 1
C51 COMPILER V7.00 腳拟串__ 04/12/2009 16:27:25 PAGE 3
118 1 TIMER0_ENABLE;
119 1 F_TM=0;
120 1 while(!F_TM); //等过起始位
121 1 ACC0=BT_REC;
122 1
123 1 TL0=TH0;
124 1
125 1 F_TM=0;
126 1 while(!F_TM);
127 1 ACC1=BT_REC;
128 1
129 1 F_TM=0;
130 1 while(!F_TM);
131 1 ACC2=BT_REC;
132 1
133 1 F_TM=0;
134 1 while(!F_TM);
135 1 ACC3=BT_REC;
136 1
137 1 F_TM=0;
138 1 while(!F_TM);
139 1 ACC4=BT_REC;
140 1
141 1 F_TM=0;
142 1 while(!F_TM);
143 1 ACC5=BT_REC;
144 1
145 1 F_TM=0;
146 1 while(!F_TM);
147 1 ACC6=BT_REC;
148 1
149 1 F_TM=0;
150 1 while(!F_TM);
151 1 ACC7=BT_REC;
152 1
153 1 F_TM=0;
154 1
155 1 while(!F_TM)
156 1 {
157 2 if(BT_REC)
158 2 {
159 3 break;
160 3 }
161 2 }
162 1 TIMER0_DISABLE; //停止timer
163 1 return ACC;
164 1 #else
unsigned char rch,ii;
TIMER0_ENABLE;
F_TM=0;
ii=0;
rch=0;
while(!F_TM); //等过起始位
while(ii<8)
{
rch>>=1;
if(BT_REC)
{
rch|=0x80;
}
ii++;
C51 COMPILER V7.00 腳拟串__ 04/12/2009 16:27:25 PAGE 4
F_TM=0;
while(!F_TM);
}
F_TM=0;
while(!F_TM)
{
if(BT_REC)
{
break;
}
}
TIMER0_DISABLE; //停止timer
return rch;
#endif
197 1
198 1 }
199 //检查是不是有起始位
200 bit StartBitOn()
201 {
202 1 return (BT_REC==0);
203 1
204 1 }
205 void main()
206 {
207 1 unsigned char gch;
208 1
209 1 TMOD=0x22; /*定时器1为工作模式2(8位自动重装)，0为模式2(8位
210 1 自动重装) */
211 1 PCON=00;
212 1
213 1 TR0=0; //在发送或接收才开始使用
214 1 TF0=0;
215 1 TH0=(256-96); //9600bps 就是 1000000/9600=104.167微秒 执行的
216 1 //timer是
217 1 //
218 1 //104.167*11.0592/12= 96
219 1 TL0=TH0;
220 1 ET0=1;
221 1 EA=1;
222 1
223 1 PSendChar(0x55);
224 1 PSendChar(0xaa);
225 1 PSendChar(0x00);
226 1 PSendChar(0xff);
227 1
228 1 while(1)
229 1 {
230 2 if(StartBitOn())
231 2 {
232 3 gch=PGetChar();
233 3 PSendChar(gch);
234 3 }
235 2 }
236 1
237 1 }
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 253 ----
C51 COMPILER V7.00 腳拟串__ 04/12/2009 16:27:25 PAGE 5
CONSTANT SIZE = ---- ----
XDATA SIZE = ---- ----
PDATA SIZE = ---- ----
DATA SIZE = ---- ----
IDATA SIZE = ---- ----
BIT SIZE = ---- ----
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
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