也发个74HC595 8段数码管的DIY：显示系统时间

soloforce

在TLL的帖子基础上写的，感谢他！
http://forum.cubietech.com/forum ... =896&extra=page%3D1

发个图片先


然后是代码

1. 
   
2. 
   
3. #include <stdio.h>
   
4. #include <stdlib.h>
   
5. #include <string.h>
   
6. #include <time.h>
   
7. #include "lib/gpio_lib.h"
   
8. 
   
9. #define LSBFIRST 0
   
10. #define MSBFIRST 1
    
11. 
    
12. typedef unsigned char byte;
    
13. 
    
14. // Cubieboard port-D pin connected to ST_CP of 74HC595 (RCK)
    
15. unsigned int latchPin = 2;
    
16. 
    
17. // Cubieboard port-D pin connected to SH_CP of 74HC595 (SCK)
    
18. unsigned int clockPin = 3;
    
19. 
    
20. // Cubieboard port-D pin connected to DS of 74HC595 (DIN)
    
21. unsigned int dataPin = 4;
    
22. 
    
23. // Digits: 0,1,2,....,9,'dot','clear' for negative-shared 8-segment-LED
    
24. unsigned int Tab[] =
    
25.     { 0xc0, 0xcf, 0xa4, 0xb0, 0x99, 0x92, 0x82, 0xf8, 0x80, 0x90, 0xff };
    
26. 
    
27. /**
    
28. * Set Cubieboard's GPIO port-D pin I/O mode: INPUT/OUTPUT
    
29. */
    
30. void pinMode(unsigned int pin, unsigned int io_mode)
    
31. {
    
32.     if (SETUP_OK != sunxi_gpio_set_cfgpin(SUNXI_GPD(pin), io_mode))
    
33.     {
    
34.         printf("Failed to config GPIO pin\n");
    
35.     }
    
36. }
    
37. 
    
38. /**
    
39. * Set Cubieboard's GPIO port-D pin value(LOW/HIGH)
    
40. */
    
41. void digitalWrite(int pin, int hl)
    
42. {
    
43.     if (sunxi_gpio_output(SUNXI_GPD(pin), hl))
    
44.     {
    
45.         printf("Failed to set GPIO pin value\n");
    
46.     }
    
47. }
    
48. 
    
49. /**
    
50. * Arduino shiftOut:
    
51. * https://github.com/arduino/Arduino/blob/master/hardware/arduino/cores/arduino/wiring_shift.c
    
52. */
    
53. void shiftOut(unsigned int dataPin, unsigned int clockPin, int bitOrder, byte val)
    
54. {
    
55.     byte i;
    
56.     for (i = 0; i < 8; i++)
    
57.     {
    
58.         if (bitOrder == LSBFIRST)
    
59.             digitalWrite(dataPin, ! !(val & (1 << i)));
    
60.         else
    
61.             digitalWrite(dataPin, ! !(val & (1 << (7 - i))));
    
62. 
    
63.         digitalWrite(clockPin, HIGH);
    
64.         digitalWrite(clockPin, LOW);
    
65.     }
    
66. }
    
67. 
    
68. /**
    
69. * Initialize the GPIO & relative pins
    
70. */
    
71. void init_gpio()
    
72. {
    
73.     if (SETUP_OK != sunxi_gpio_init())
    
74.     {
    
75.         printf("Failed to initialize GPIO\n");
    
76.     }
    
77.     pinMode(latchPin, OUTPUT);
    
78.     pinMode(clockPin, OUTPUT);
    
79.     pinMode(dataPin, OUTPUT);
    
80. }
    
81. 
    
82. int main(int argc, char **argv)
    
83. {
    
84.     time_t timep;
    
85.     struct tm *p;
    
86.     char buf[6];
    
87. 
    
88.     // init GPIO & pins
    
89.     init_gpio();
    
90.   
    
91.     while (1)
    
92.     {
    
93.         // get localtime
    
94.         time(&timep);
    
95.         p = localtime(&timep);
    
96.         sprintf(buf, "%02d%02d%02d", p->tm_hour, p->tm_min, p->tm_sec);
    
97.         int i;
    
98.         for (i = 0; i < sizeof(buf); i++)
    
99.         {
    
100.             digitalWrite(latchPin, 0);
     
101.             shiftOut(dataPin, clockPin, MSBFIRST, 1 << i);
     
102.             shiftOut(dataPin, clockPin, MSBFIRST, Tab[buf[i] - '0']);
     
103.             digitalWrite(latchPin, 1);
     
104.             usleep(1000);
     
105.         }
     
106. 
     
107.     }
     
108. 
     
109.     return 0;
     
110. }
     

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