"Development tools: Keil
Simulation tool: proteus
The code is as follows:
Header file: Inc_ all.h
1 #ifndef INC_ ALL_ H_
2 #define INC_ ALL_ H_
three
4 volatile unsigned char keyValue;
5 volaTIle unsigned char sign;
6 volaTIle long int opr1;
7 volaTIle long int opr2;
8 volaTIle long int SysValue=0;
9 volatile int keyCounter;
10 volatile int cnt50ms=0;
11 volatile bit StartFlag;
twelve
13 void Init_ Timer0（）;
14 void Init_ Timer1（）;
15 void delayms（int t）;
16 unsigned char KeyScan（void）;
17 void showNumber（long int num）;
18 void keyAnalyzing（unsigned char keyval）;
nineteen
20 #endif
The source file is as follows: main. C
1 #include
2 #include “inc_ all.h”
3 //=======================================================
4 / / nixie tube display decoding, common cathode
5 / / 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, off, 'e', '-'
6 //=======================================================
7 unsigned char code table［］={0x3F，0x06，0x5b，0x4F，0x66，
8 0x6d，0x7d，0x07，0x7F，0x6F，
9 0x00/* trun off */，
10 0x79/* Error */，
11 0x40/* - */};
12 //========================================================
13 / / timer 0 initializes the function, timing 50ms
14 / / start counting with the "start" key on the keyboard
15 / / pause counting with the "sus" key on the keyboard
16 //========================================================
17 void Init_ Timer0（）
18 {
19 TMOD |= 0x01;
20 TH0 = 0x3C;
21 TL0 = 0xB0;
22 TR0 = 0;
23 ET0 = 1;
24 }
25 //=========================================================
26 / / timer 1 initialization function
27 / / timing: 23 MS, for display
28 / / timing starts after initialization
29 //=========================================================
30 void Init_ Timer1（）
31 {
32 TMOD |= 0x10;
33 TH1 = 0xA6;
34 TL1 = 0x28;
35 TR1 = 1;
36 ET1 = 1;
37 }
38 //=========================================================
39 / / delay function
40 //=========================================================
41 void delayms（int t）
42 {
43 int i，j;
44 for（i=t; i》0; i--）
45 for（j=25; j》0; j--）
46 ;
47 }
48 //=========================================================
49 / / four digit nixie tube display function
50 / / it can automatically turn off zero and automatically identify the sign
51 / / when the value exceeds the display range, an error "e ---" is displayed
52 //=========================================================
53 void showNumber（long int num）
54 {
55 unsigned char q，s，b，g;
56 if（num》=0）
57 {
58 q = num/1000;
59 b = num/100%10;
60 s = num/10%10;
61 g = num%10;
62 if（num《10）
63 {
64 q = 10;
65 b = 10;
66 s = 10;
67 }
68 else if（num《100）
69 {
70 q = 10;
71 b = 10;
72 }
73 else if（num《1000）
74 q = 10;
75 else if（num》9999）
76 {
77 q = 11; // show error
78 b = 12;
79 s = 12;
80 g = 12;
81 }
82 }
83 else
84 {
85 if（num》-1000）
86 {
87 q = 12;
88 b = （0-num）/100;
89 s = （0-num）/10%10;
90 g = （0-num）%10;
91 }
92 else
93 {
94 q = 11; // show error
95 b = 12;
96 s = 12;
97 g = 12;
98 }
99 }
100 P0 = 0x00;
101 P0 = table［q］;
102 P2 = 0xFE;
103 delayms（10）;
104 P0 = 0x00;
105 P0 = table［b］;
106 P2 = 0xFD;
107 delayms（10）;
108 P0 = 0x00;
109 P0 = table［s］;
110 P2 = 0xFB;
111 delayms（10）;
112 P0 = 0x00;
113 P0 = table［g］;
114 P2 = 0xF7;
115 delayms（10）;
116 }
117 //=========================================================
118 / / keyboard scanning function
119 / / press the key to return the scanning result
120 //=========================================================
121 unsigned char KeyScan（void）
122 {
123 unsigned char temp=0xF0;
124 P1 = temp;
125 temp = P1;
126 if（temp！= 0xF0）
127 {
128 delayms（5）; // debounce
129 temp = P1;
130 if（temp！= 0xF0）
131 {
132 int t=0x01，i;
133 for（i=0; i《4; i++）
134 {
135 P1 = ~（t《
136 temp = P1;
137 switch (Temp) / / scan by line
138 {
139 case 0xee： return ‘1’;
140 case 0xde： return ‘2’;
141 case 0xbe： return ‘3’;
142 case 0x7e： return ‘+’; // plus
one hundred and forty-three
144 case 0xed： return ‘4’;
145 case 0xdd： return ‘5’;
146 case 0xbd： return ‘6’;
147 case 0x7d： return ‘-’; // minus sign
one hundred and forty-eight
149 case 0xeb： return ‘7’;
150 case 0xdb： return ‘8’;
151 case 0xbb： return ‘9’;
152 case 0x7b： return ‘r’; // reset
one hundred and fifty-three
154 case 0xe7： return ‘0’;
155 case 0xd7： return ‘s’; // start-up
156 case 0xb7： return ‘t’; // suspend
157 case 0x77： return ‘=’; // be equal to
158 default： ;
159 }
160 }
161 }
162 }
163 return ‘0’;
164 }
165 / / ====================================================================
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