基于AT89S52的pwm脉宽调制的C语言编程
源代码在线查看： sp0604_实验19_脉宽可调和显示的pwm信号.lst
C51 COMPILER V8.01 SP0604_实验19_耞宽可礯和显蔩的PWM信号 04/06/2006 23:14:24 PAGE 1
C51 COMPILER V8.01, COMPILATION OF MODULE SP0604_实验19_耞宽可礯和显蔩的PWM信号
OBJECT MODULE PLACED IN SP0604_实验19_脉宽可调和显示的PWM信号.OBJ
COMPILER INVOKED BY: d:\Keil\C51\BIN\C51.EXE SP0604_实验19_脉宽可调和显示的PWM信号.c BROWSE DEBUG OBJECTEXTEND TABS(2)
line level source
1 #include
2
3
4
5 #define KEY_ADD (P3 & 0x04)
6 #define KEY_SUB (P3 & 0x08)
7
8
9
10 #define PWM P1_0
11 unsigned char PWM_High=50;
12 unsigned char PWM_Count=0;
13
14
15 void timer0(void) interrupt 1
16 {
17 1 if(PWM_Count 18 1 else PWM=1;
19 1 PWM_Count++;
20 1 if(PWM_Count==100)PWM_Count=0;
21 1 }
22
23
24 const unsigned char LEDDATA[]={0x3f,0x06,0x5b,0x4f,0x66,
25 0x6d,0x7d,0x07,0x7f,0x6f,
26 0x77,0x7c,0x39,0x5e,0x79,0x71,
27 };
28 //数码管扫描代码表
29 unsigned char code LEDBITDATA[]=
30 {
31 0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f,
32 };
33
34 #define LEDDATAPORT P0
35 #define LEDBITPORT P2
36 unsigned char ScanLedCount;
37 unsigned char LEDBuffer[2];
38
39 void timer1(void) interrupt 3
40 {
41 1 TH1=(65536-2000)/256;
42 1 TL1=(65536-2000)%256;
43 1
44 1 LEDDATAPORT=LEDDATA[LEDBuffer[ScanLedCount]];
45 1 LEDBITPORT =LEDBITDATA[ScanLedCount];
46 1 ScanLedCount++;
47 1 if(ScanLedCount==sizeof(LEDBuffer))ScanLedCount=0;
48 1 }
49
50
51
52 void Delay(unsigned int t)
53 {
54 1 while(t)t--;
55 1 }
C51 COMPILER V8.01 SP0604_实验19_耞宽可礯和显蔩的PWM信号 04/06/2006 23:14:24 PAGE 2
56
57
58
59 void main(void)
60 {
61 1 TMOD=0x12;
62 1 TH0=256-184;
63 1 TL0=TH0;
64 1 TH1=(65536-2000)/256;
65 1 TL1=(65536-2000)%256;
66 1 TR0=1;
67 1 TR1=1;
68 1 ET0=1;
69 1 ET1=1;
70 1 EA=1;
71 1
72 1 LEDBuffer[0]=PWM_High%10;
73 1 LEDBuffer[1]=PWM_High/10;
74 1 while(1)
75 1 {
76 2 if(KEY_ADD==0)
77 2 {
78 3 Delay(1000);
79 3 if(KEY_ADD==0)
80 3 {
81 4 PWM_High--;
82 4 if(PWM_High==0)PWM_High=1;
83 4 LEDBuffer[0]=PWM_High%10;
84 4 LEDBuffer[1]=PWM_High/10;
85 4 while(KEY_ADD==0);
86 4 }
87 3 }
88 2
89 2 if(KEY_SUB==0)
90 2 {
91 3 Delay(1000);
92 3 if(KEY_SUB==0)
93 3 {
94 4 PWM_High++;
95 4 if(PWM_High==100)PWM_High=99;
96 4 LEDBuffer[0]=PWM_High%10;
97 4 LEDBuffer[1]=PWM_High/10;
98 4 while(KEY_SUB==0);
99 4 }
100 3 }
101 2 }
102 1 }
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 242 ----
CONSTANT SIZE = 8 ----
XDATA SIZE = ---- ----
PDATA SIZE = ---- ----
DATA SIZE = 21 ----
IDATA SIZE = ---- ----
BIT SIZE = ---- ----
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
