我的这段程序怎么改才能实现根据温度不同来控制风扇的转速

ID:299028 · 发表于 2018-3-29 20:21

希望大佬能够解答！

2 #include <common.h>
3 #include <18b20.h>
4
5 WORD PwmVal[FAN_NUM];
6 bit PwmRunFlag;
7
8 void PwmInit( void )
9 {
10 1 // PWM/CCP设置引脚在P35-P37
11 1 AUXR1 &= ~0x30;
12 1 AUXR1 |= 0x10;
13 1
14 1 // PWM/CCP时钟为系统脉冲/6
15 1 // 即 24/6 = 4Mhz
16 1 CMOD = 0x0c;
17 1 CR = 1;
18 1
19 1 // PWM1、PWM2工作于8位模式
20 1 PCA_PWM1 = 0x00;
21 1 PCA_PWM2 = 0x00;
22 1
23 1 // PWM1、PWM2停止工作
24 1 CCAPM1 = 0;
25 1 CCAPM2 = 0;
26 1 }
27
28 // 温度低于40度，风扇不转，温蒂高于80度，风扇全速转动
29
30 #define TEMPLOW 400
31 #define TEMPHIGH 850
32 #define TEMPERR 5
33
34 void TemperatureToPwm( void )
35 {
36 1 BYTE i;
37 1 WORD wtmp;
38 1
39 1 wtmp = TempVale[0];
40 1 for( i = 1; i < TCH_NUM; i++ )
41 1 {
42 2 if ( wtmp <= TempVale[i] )
43 2 wtmp = TempVale[i];
44 2 }
45 1 // 获取温度最大值
46 1
47 1 // 风扇已打开，且温度低于最低温度
48 1 if ( wtmp <= (TEMPLOW - TEMPERR) && PwmRunFlag )
49 1 {
50 2 PwmRunFlag = 0;
51 2 PwmVal[0] = 0;
52 2 PwmVal[1] = 0;
53 2 return;
54 2 }
55 1 if ( wtmp >= (TEMPLOW + TEMPERR) )
C51 COMPILER V9.53.0.0 PWM 03/23/2018 11:49:53 PAGE 2
56 1 {
57 2 if ( wtmp >= TEMPHIGH )
58 2 {
59 3 PwmVal[0] = 258;
60 3 }
61 2 else
62 2 {
63 3 PwmVal[0] = (((WORD)(wtmp - TEMPLOW)) * 256) / (TEMPHIGH - TEMPLOW);
64 3 }
65 2 PwmVal[1] = PwmVal[0];
66 2 }
67 1 }
68
69 void PwmRefresh( void )
70 {
71 1 if ( !PwmVal[0] )
72 1 {
73 2 CCAPM1 = 0;
74 2 }
75 1 else
76 1 {
77 2 CCAP1H = PwmVal[0];
78 2 if ( PwmVal[0] >= 256 )
79 2 PCA_PWM1 |= 0x02;
80 2 else
81 2 PCA_PWM1 &= ~0x02;
82 2
83 2 CCAPM1 = 0x42;
84 2
85 2 PwmRunFlag = 1;
86 2 }
87 1
88 1 if ( !PwmVal[1] )
89 1 {
90 2 CCAPM2 = 0;
91 2 }
92 1 else
93 1 {
94 2 CCAP2H = PwmVal[1];
95 2 if ( PwmVal[1] >= 256 )
96 2 PCA_PWM2 |= 0x02;
97 2 else
98 2 PCA_PWM2 &= ~0x02;
99 2
100 2 CCAPM2 = 0x42;
101 2
102 2 PwmRunFlag = 1;
103 2 }
104 1 }

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