2023年01月13日 | 用C语言写一个温度测量显示程序

P1ASF = 0x0C; //P1.2 P1.3做ADC

ADC_CONTR = 0xE0; //90T, ADC power on

AUXR = 0x80; //Timer0 set as 1T, 16 bits timer auto-reload,

TH0 = (u8)(Timer0_Reload / 256);

TL0 = (u8)(Timer0_Reload % 256);

ET0 = 1; //Timer0 interrupt enable

TR0 = 1; //Tiner0 run

EA = 1; //打开总中断

for(i=0; i<8; i++) LED8[i] = 0x10; //上电消隐

while(1)

{

if(B_1ms) //1ms到

{

B_1ms = 0;

if(++msecond >= 300) //300ms到

{

msecond = 0;

j = Get_ADC10bitResult(2); //参数0~7,查询方式做一次ADC, 返回值就是结果, == 1024 为错误

if(j < 1024)

{

LED8[0] = j / 1000; //显示ADC值

LED8[1] = (j % 1000) / 100;

LED8[2] = (j % 100) / 10;

LED8[3] = j % 10;

if(LED8[0] == 0) LED8[0] = DIS_BLACK;

}

else //错误

{

for(i=0; i<4; i++) LED8[i] = DIS_;

}

j = Get_ADC10bitResult(3); //参数0~7,查询方式做一次ADC, 返回值就是结果, == 1024 为错误

j += Get_ADC10bitResult(3);

j += Get_ADC10bitResult(3);

j += Get_ADC10bitResult(3);

if(j < 1024*4)

{

/*

LED8[0] = j / 1000; //显示ADC值

LED8[1] = (j % 1000) / 100;

LED8[2] = (j % 100) / 10;

LED8[3] = j % 10;

if(LED8[0] == 0) LED8[0] = DIS_BLACK;

*/

j = get_temperature(j); //计算温度值

if(j >= 400) F0 = 0, j -= 400; //温度 >= 0度

else F0 = 1, j = 400 - j; //温度 < 0度

LED8[4] = j / 1000; //显示温度值

LED8[5] = (j % 1000) / 100;

LED8[6] = (j % 100) / 10 + DIS_DOT;

LED8[7] = j % 10;

if(LED8[4] == 0) LED8[4] = DIS_BLACK;

if(F0) LED8[4] = DIS_; //显示-

}

else //错误

{

for(i=0; i<8; i++) LED8[i] = DIS_;

}

}

}

}

}

u16 Get_ADC10bitResult(u8 channel) //channel = 0~7

{

ADC_RES = 0;

ADC_RESL = 0;

ADC_CONTR = (ADC_CONTR & 0xe0) | 0x08 | channel; //start the ADC

NOP(4);

while((ADC_CONTR & 0x10) == 0) ; //wait for ADC finish

ADC_CONTR &= ~0x10; //清除ADC结束标志

return (((u16)ADC_RES << 2) | (ADC_RESL & 3));

}

// MF52E 10K at 25, B = 3950, ADC = 12 bits

u16 code temp_table[]={

140, //;-40 0

149, //;-39 1

159, //;-38 2

168, //;-37 3

178, //;-36 4

188, //;-35 5

199, //;-34 6

210, //;-33 7

222, //;-32 8

233, //;-31 9

246, //;-30 10

259, //;-29 11

272, //;-28 12

286, //;-27 13

301, //;-26 14

317, //;-25 15

333, //;-24 16

349, //;-23 17

367, //;-22 18

385, //;-21 19

403, //;-20 20

423, //;-19 21

443, //;-18 22

464, //;-17 23

486, //;-16 24

509, //;-15 25

533, //;-14 26

558, //;-13 27

583, //;-12 28

610, //;-11 29

638, //;-10 30

667, //;-9 31

696, //;-8 32

727, //;-7 33

758, //;-6 34

791, //;-5 35

824, //;-4 36

858, //;-3 37

893, //;-2 38

929, //;-1 39

965, //;0 40

1003, //;1 41

1041, //;2 42

1080, //;3 43

1119, //;4 44

1160, //;5 45

1201, //;6 46

1243, //;7 47

1285, //;8 48

1328, //;9 49

1371, //;10 50

1414, //;11 51

1459, //;12 52

1503, //;13 53

1548, //;14 54

1593, //;15 55

1638, //;16 56

1684, //;17 57

1730, //;18 58

1775, //;19 59

1821, //;20 60

1867, //;21 61

1912, //;22 62

1958, //;23 63

2003, //;24 64

2048, //;25 65

2093, //;26 66

2137, //;27 67

2182, //;28 68

2225, //;29 69

2269, //;30 70

2312, //;31 71

2354, //;32 72

2397, //;33 73

2438, //;34 74

2479, //;35 75

2519, //;36 76

2559, //;37 77

2598, //;38 78

2637, //;39 79

2675, //;40 80

2712, //;41 81

2748, //;42 82

2784, //;43 83

2819, //;44 84

2853, //;45 85

2887, //;46 86

2920, //;47 87

2952, //;48 88

2984, //;49 89

3014, //;50 90

3044, //;51 91

3073, //;52 92

3102, //;53 93

3130, //;54 94

3157, //;55 95

3183, //;56 96

3209, //;57 97

3234, //;58 98

3259, //;59 99

3283, //;60 100

3306, //;61 101

3328, //;62 102

3351, //;63 103

3372, //;64 104

3393, //;65 105

3413, //;66 106

3432, //;67 107

3452, //;68 108

3470, //;69 109

3488, //;70 110

3506, //;71 111

3523, //;72 112

3539, //;73 113

3555, //;74 114

3571, //;75 115

3586, //;76 116

3601, //;77 117

3615, //;78 118

3628, //;79 119

3642, //;80 120

3655, //;81 121

3667, //;82 122

3679, //;83 123

3691, //;84 124

3702, //;85 125

3714, //;86 126

3724, //;87 127

3735, //;88 128

3745, //;89 129

3754, //;90 130

3764, //;91 131

3773, //;92 132

3782, //;93 133

3791, //;94 134

3799, //;95 135

3807, //;96 136

3815, //;97 137

3822, //;98 138

3830, //;99 139

3837, //;100 140

3844, //;101 141

3850, //;102 142

3857, //;103 143

3863, //;104 144

3869, //;105 145

3875, //;106 146

3881, //;107 147

3887, //;108 148

3892, //;109 149

3897, //;110 150

3902, //;111 151

3907, //;112 152

3912, //;113 153

3917, //;114 154

3921, //;115 155

3926, //;116 156

3930, //;117 157

3934, //;118 158

3938, //;119 159

3942 //;120 160

};

/*** 计算温度 ***/

// 计算结果: 0对应-40.0度, 400对应0度, 625对应25.0度, 最大1600对应120.0度.

// 为了通用, ADC输入为12bit的ADC值.

// 电路和软件算法设计: Coody

#define D_SCALE 10 //结果放大倍数, 放大10倍就是保留一位小数

u16 get_temperature(u16 adc)

{

u16 code *p;

u16 i;

u8 j,k,min,max;

adc = 4096 - adc; //Rt接地

p = temp_table;

if(adc < p[0]) return (0xfffe);

if(adc > p[160]) return (0xffff);

min = 0; //-40度

max = 160; //120度

for(j=0; j<5; j++) //对分查表

{

k = min / 2 + max / 2;

if(adc <= p[k]) max = k;

else min = k;

}

if(adc == p[min]) i = min * D_SCALE;

else if(adc == p[max]) i = max * D_SCALE;

else // min < temp < max

{

while(min <= max)

{

min++;

if(adc == p[min]) {i = min * D_SCALE; break;}

else if(adc < p[min])

{

min--;

i = p[min]; //min

j = (adc - i) * D_SCALE / (p[min+1] - i);

i = min;

i *= D_SCALE;

i += j;

break;

}

}

}

return i;

}

/***向HC595发送一个字节函数 ***/

void Send_595(u8 dat)

{

u8 i;

for(i=0; i<8; i++)

{

dat <<= 1;

P_HC595_SER = CY;

P_HC595_SRCLK = 1;

P_HC595_SRCLK = 0;

}

}

/*** 显示扫描函数 ***/

void DisplayScan(void)

{

Send_595(~T_COM[display_index]); //输出位码

Send_595(t_display[LED8[display_index]]); //输出段码

P_HC595_RCLK = 1;

P_HC595_RCLK = 0; //锁存输出数据

if(++display_index >= 8) display_index = 0; //8位结束回0

}

/*** Timer0 1ms中断函数 ***/

void timer0 (void) interrupt TIMER0_VECTOR

{

DisplayScan(); //1ms扫描显示一位

B_1ms = 1; //1ms标志

}