📄 pwm.lst
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C51 COMPILER V7.07 PWM 09/07/2010 13:40:22 PAGE 1
C51 COMPILER V7.07, COMPILATION OF MODULE PWM
OBJECT MODULE PLACED IN PWM.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE PWM.c BROWSE DEBUG OBJECTEXTEND
stmt level source
1
2 //单片机产生方波、锯齿波、三角波程序
3
4 #include<reg51.h>
5
6 #define uchar unsigned char
7 #define uint unsigned int
8
9 unsigned char x=0,m=0,y=50;
10
11 sbit WR_DA=P2^1;
12 sbit CS_DA=P2^0;//DA与单片机的接口
13 sbit S0=P3^2; //波形选择，每次按下将产生不同的波形
14 sbit S1=P3^3; //频率减
15 sbit S2=P3^4; //频率加
16 sbit S3=P3^5; //调节方波的占空比
17 sbit led=P2^2; //调节方波的占空比
18 uchar code SinTab[256]={0x80,0x83,0x86,0x89,0x8d,0x90,0x93,0x96,0x99,0x9c,0x9f,0xa2,0xa5,0xa8,0xab,0xae,0x
-b1,0xb4,0xb7,0xba,0xbc,0xbf,0xc2,0xc5
19
20 ,0xc7,0xca,0xcc,0xcf,0xd1,0xd4,0xd6,0xd8,0xda,0xdd,0xdf,0xe1,0xe3,0xe5,0xe7,0xe9,0xea,0xec,0xee,0xef,0xf1,
-0xf2,0xf4,0xf5
21
22 ,0xf6,0xf7,0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfd,0xfe,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
-0xff,0xfe,0xfd
23
24 ,0xfd,0xfc,0xfb,0xfa,0xf9,0xf8,0xf7,0xf6,0xf5,0xf4,0xf2,0xf1,0xef,0xee,0xec,0xea,0xe9,0xe7,0xe5,0xe3,0xe1,
-0xde,0xdd,0xda
25
26 ,0xd8,0xd6,0xd4,0xd1,0xcf,0xcc,0xca,0xc7,0xc5,0xc2,0xbf,0xbc,0xba,0xb7,0xb4,0xb1,0xae,0xab,0xa8,0xa5,0xa2,
-0x9f,0x9c,0x99
27
28 ,0x96,0x93,0x90,0x8d,0x89,0x86,0x83,0x80,0x80,0x7c,0x79,0x76,0x72,0x6f,0x6c,0x69,0x66,0x63,0x60,0x5d,0x5a,
-0x57,0x55,0x51
29
30 ,0x4e,0x4c,0x48,0x45,0x43,0x40,0x3d,0x3a,0x38,0x35,0x33,0x30,0x2e,0x2b,0x29,0x27,0x25,0x22,0x20,0x1e,0x1c,
-0x1a,0x18,0x16
31
32 ,0x15,0x13,0x11,0x10,0x0e,0x0d,0x0b,0x0a,0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x02,0x02,0x01,0x00,0x00,0x00,
-0x00,0x00,0x00
33
34 ,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x02 ,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0d,0x0e,0x10
-,0x11,0x13,0x15
35
36 ,0x16,0x18,0x1a,0x1c,0x1e,0x20,0x22,0x25,0x27,0x29,0x2b,0x2e,0x30,0x33,0x35,0x38,0x3a,0x3d,0x40,0x43,0x45,
-0x48,0x4c,0x4e
37
38 ,0x51,0x55,0x57,0x5a,0x5d,0x60,0x63,0x66 ,0x69,0x6c,0x6f,0x72,0x76,0x79,0x7c,0x80 };
39
40 void delayms(uint t)
41 {
42 1 uint i;
43 1 while(t--)
44 1 {
45 2 for (i=0;i<125;i++);//对于11.0592M时钟，约延时1ms
C51 COMPILER V7.07 PWM 09/07/2010 13:40:22 PAGE 2
46 2 }
47 1 }
48
49 void delay(uint t)
50 {
51 1 uint i;
52 1 for (i=t;i>0;i--);
53 1 }
54
55
56 void time0_init()
57 {
58 1 TMOD|=0x01; //定时器设置 16位
59 1 TH0=-50000/256;
60 1 TL0=-50000%256;//初始化值
61 1 ET0=1;
62 1 TR0=1;
63 1 EA=1;
64 1 }
65
66 void time0_int(void) interrupt 1
67 {
68 1 TR0=0;//关闭定时器
69 1 TH0=-50000/256;
70 1 TL0=-50000%256;//重装初值
71 1
72 1 if(S0==0)
73 1 {
74 2 delayms(10);//按键消抖
75 2 if(S0==0)
76 2 {
77 3 m++;
78 3 if(m==5)
79 3 m=0;
80 3 led=0;
81 3 }
82 2 while(!S0);//松手检测
83 2 }
84 1
85 1 if(S1==0)
86 1 {
87 2 delayms(10);
88 2 if(S1==0)
89 2 {
90 3 x=x+1;
91 3 led=1;
92 3 }
93 2 while(!S1);//松手检测
94 2 }
95 1
96 1 if(S2==0)
97 1 {
98 2 delayms(10);
99 2 if(S2==0) x=x-1;
100 2 while(!S2);//松手检测
101 2 }
102 1
103 1 if(S3==0)
104 1 {
105 2 delayms(10);
106 2 if(S3==0) y=y+5;
107 2 while(!S3);//松手检测
C51 COMPILER V7.07 PWM 09/07/2010 13:40:22 PAGE 3
108 2 }
109 1
110 1 if(y>254) y=0;
111 1 if(m>5) m=0;
112 1 if(x>50) x=0;
113 1 TR0=1;//启动定时器
114 1 }
115
116 void fangbo() //方波
117 {
118 1 uchar i,j;
119 1 j=255-y;
120 1 CS_DA=0;
121 1 WR_DA=0;
122 1 for(i=y;i>0;i--)
123 1 {
124 2 P0=0;
125 2 delay(x);
126 2 }
127 1
128 1 while(j--)
129 1 {
130 2 P0=255;
131 2 delay(x);
132 2 }
133 1 }
134
135 void juchi() //锯齿波
136 {
137 1 uchar i;
138 1 CS_DA=0;
139 1 WR_DA=0;
140 1 for(i=255;i>0;i--)
141 1 {
142 2 P0=i;
143 2 delay(x);
144 2 }
145 1
146 1 }
147 void sanjiao() //三角波
148 {
149 1 uchar i;
150 1 CS_DA=0;
151 1 WR_DA=0;
152 1 for(i=0;i<255;i++)
153 1 {
154 2 P0=i;
155 2 delay(x);
156 2 }
157 1 while(i--)
158 1 {
159 2 P0=i;
160 2 delay(x);
161 2 }
162 1 }
163
164 void tixing() //梯形波
165 {
166 1 uchar i=255,j,k;
167 1 CS_DA=0;
168 1 WR_DA=0;
169 1 while(i--)
C51 COMPILER V7.07 PWM 09/07/2010 13:40:22 PAGE 4
170 1 {
171 2 P0=i;
172 2 delay(x);
173 2 }
174 1
175 1 for(j=0;j<100;j++)
176 1 {
177 2 P0=0;
178 2 delay(x);
179 2 }
180 1
181 1 for(k=0;k<255;k++)
182 1 {
183 2 P0=k;
184 2 delay(x);
185 2 }
186 1 }
187
188 void sin() //正弦波
189 {
190 1 uchar a;
191 1 CS_DA=0;
192 1 WR_DA=0;
193 1 for(a=0;a<255;a++)
194 1 {
195 2 P0=SinTab[a];
196 2 delay(x);
197 2 }
198 1 }
199
200 main()
201 {
202 1 time0_init();
203 1 while(1)
204 1 {
205 2 switch(m)
206 2 {
207 3 case 0:
208 3 fangbo(); //方波
209 3 break;
210 3 case 1:
211 3 juchi(); //锯齿波
212 3 break;
213 3 case 2:
214 3 sanjiao(); //三角波
215 3 break;
216 3 case 3:
217 3 sin(); //正弦波
218 3 break;
219 3 case 4:
220 3 tixing(); //梯形波
221 3 break;
222 3 default: fangbo();
223 3 }
224 2 }
225 1 }
226
227
228
229 //参考链接：http://www.picavr.com/news/2010-08/2297.htm
C51 COMPILER V7.07 PWM 09/07/2010 13:40:22 PAGE 5
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 413 ----
CONSTANT SIZE = 256 ----
XDATA SIZE = ---- ----
PDATA SIZE = ---- ----
DATA SIZE = 3 ----
IDATA SIZE = ---- ----
BIT SIZE = ---- ----
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
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