主题 : mini2440 24C08 驱动代码 复制链接 | 浏览器收藏 | 打印
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楼主  发表于: 2014-10-17 01:54
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 mini2440 24C08 驱动代码

我在 kernel 找不到 24C08 相关驱动代码 ,

.config  文件里面 CONFIG_AT24  is not set 也是没打开

为什么 下面 测试程序 24C08 又成正常 write / read ,
复制代码
  1. /***************************************************************************
  2.     copyright            : (C) by 2009 Guangzhou FriendlyaRM, in China
  3.     email                : capbily@163.com
  4.     website         : http://www.arm9.net
  6. ***************************************************************************/
  9. /*  串口终端中执行命令i2c –w 可以向板子的24C08 器件中写入数据（0x00-0xff）
  10. *  
  11. * i2c –r 可以从板子的24C08 器件中读出输出
  12. *
  13. */
  15. #include <stdio.h>
  16. #include <fcntl.h>
  17. #include <getopt.h>
  18. #include <unistd.h>
  19. #include <stdlib.h>
  20. #include <errno.h>
  21. #include <string.h>
  22. #include <sys/types.h>
  23. #include <sys/stat.h>
  24. #include "24cXX.h"
  26. #define usage_if(a) do { do_usage_if( a , __LINE__); } while(0);
  27. void do_usage_if(int b, int line)
  28. {
  29.     const static char *eeprog_usage =
  30.         "I2C-24C08(256 bytes) Read/Write Program, ONLY FOR TEST!\n"
  31.         "FriendlyARM Computer Tech. 2009\n";
  32.     if(!b)
  33.         return;
  34.     fprintf(stderr, "%s\n[line %d]\n", eeprog_usage, line);
  35.     exit(1);
  36. }
  39. #define die_if(a, msg) do { do_die_if( a , msg, __LINE__); } while(0);
  40. void do_die_if(int b, char* msg, int line)
  41. {
  42.     if(!b)
  43.         return;
  44.     fprintf(stderr, "Error at line %d: %s\n", line, msg);
  45.     fprintf(stderr, "    sysmsg: %s\n", strerror(errno));
  46.     exit(1);
  47. }
  50. static int read_from_eeprom(struct eeprom *e, int addr, int size)
  51. {
  52.     int ch, i;
  53.     for(i = 0; i < size; ++i, ++addr)
  54.     {
  55.         die_if((ch = eeprom_read_byte(e, addr)) < 0, "read error");
  56.         if( (i % 16) == 0 )
  57.             printf("\n %.4x|  ", addr);
  58.         else if( (i % 8) == 0 )
  59.             printf("  ");
  60.         printf("%.2x ", ch);
  61.         fflush(stdout);
  62.     }
  63.     fprintf(stderr, "\n\n");
  64.     return 0;
  65. }
  67. static int write_to_eeprom(struct eeprom *e, int addr)
  68. {
  69.     int i;
  70.     for(i=0, addr=0; i<256; i++, addr++)
  71.     {
  72.         if( (i % 16) == 0 )
  73.             printf("\n %.4x|  ", addr);
  74.         else if( (i % 8) == 0 )
  75.             printf("  ");
  76.         printf("%.2x ", i);
  77.         fflush(stdout);
  78.         die_if(eeprom_write_byte(e, addr, i), "write error");
  79.     }
  80.     fprintf(stderr, "\n\n");
  81.     return 0;
  82. }
  84. int main(int argc, char** argv)
  85. {
  86.     struct eeprom e;
  87.     int op;
  89.     op = 0;
  91.     usage_if(argc != 2 || argv[1][0] != '-' || argv[1][2] != '\0');
  92.     op = argv[1][1];
  94.     fprintf(stderr, "Open /dev/i2c-0 with 8bit mode\n");
  95.     die_if(eeprom_open("/dev/i2c-0", 0x50, EEPROM_TYPE_8BIT_ADDR, &e) < 0,
  96.             "unable to open eeprom device file "
  97.             "(check that the file exists and that it's readable)");
  98.     switch(op)
  99.     {
  100.     case 'r':
  101.         fprintf(stderr, "  Reading 256 bytes from 0x0\n");
  102.         read_from_eeprom(&e, 0, 256);
  103.         break;
  104.     case 'w':
  105.         fprintf(stderr, "  Writing 0x00-0xff into 24C08 \n");
  106.         write_to_eeprom(&e, 0);
  107.         break;
  108.     default:
  109.         usage_if(1);
  110.         exit(1);
  111.     }
  112.     eeprom_close(&e);
  114.     return 0;
  115. }
[ 此帖被shihyu在2014-10-17 02:11重新编辑 ]
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1楼  发表于: 2014-10-17 18:09
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驱动没开源吧，友善在编译的时候，只给了我们一个.ko文件
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