이것은 간단히 Serial 통신을 하는 예제입니다.
serial로부터 받은 데이터를 고스란히 다시 반향하여 보내는 것입니다.

현재 코드는 다음과 같이 만들어져 있습니다
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  1. port=COM1 ("/dev/ttyS0")
  2. baud=9600
  3. parity=true
  4. stop=1
  5. data=8bit


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  1. /*
  2. Copyright (C) Information Equipment co.,LTD
  3. All rights reserved.
  4. Code by JaeHyuk Cho
  5. CVSTAG="$Header$"
  6. */
  8. #include
  9. #include
  10. #include
  11. #include
  12. #include
  13. #include
  14. #include
  15. #include
  16. #include
  17. #include
  18. #include
  20. #define mz_dump(m_d,m_s) do{int s_o,s_w,s_i;unsigned char s_b[17];if(((void *)(m_d))!=NULL){s_b[16]='\0';s_o=(int)0;\
  21. while(s_o<(m_s)){s_w=((m_s)-s_o)<16?((m_s)-s_o):16;printf("%08X",s_o);for(s_i=0;s_iif(s_i==8)printf(" | ");else printf(" ");\
  22. s_b[s_i]=*(((unsigned char *)(m_d))+s_o+s_i);printf("%02X",s_b[s_i]);if((s_b[s_i]&0x80)||(s_b[s_i]<' '))s_b[s_i]='.';}\
  23. while(s_i<16){if(s_i==8)printf(" ");else printf(" ");s_b[s_i]=' ';s_i++;}\
  24. printf(" [%s]\n",(char *)s_b);s_o+=16;}}else printf("error: dump null\n");}while(0)
  26. int g_mz_break = 0;
  28. void mz_my_signal(int s_signal)
  29. {
  30. switch(s_signal)
  31. {
  32. case SIGINT:
  33. g_mz_break = 1;
  34. (void)signal(s_signal, mz_my_signal);
  35. break;
  36. default:
  37. (void)fprintf(stdout, "unknown signal ! (%d)\n", s_signal);
  38. break;
  39. }
  40. }
  42. int main(void)
  43. {
  44. /* configuration */
  45. char *s_device_name = "/dev/ttyS0";
  46. speed_t s_baud = B9600;
  47. tcflag_t s_data_bits = CS8;
  48. int s_parity_bit = 1;
  50. int s_handle, s_index, s_check;
  51. struct termios s_prev_termios, s_new_termios;
  52. ssize_t s_read_bytes, s_write_bytes;
  53. struct timeval s_timeval;
  54. fd_set s_fd_in;
  55. unsigned char s_buffer[ 4 <<>
  57. (void)signal(SIGINT, mz_my_signal);
  59. s_handle = open(s_device_name, O_RDWR | O_NOCTTY);
  60. if(s_handle != (-1))
  61. {
  62. if(tcgetattr(s_handle, (struct termios *)(&s_prev_termios)) == 0)
  63. {
  64. (void)memcpy((void *)(&s_new_termios), (void *)(&s_prev_termios), (size_t)sizeof(struct termios));
  66. s_new_termios.c_iflag = IGNBRK | ((s_parity_bit == 0) ? ((tcflag_t)0) : IGNPAR);
  67. s_new_termios.c_oflag = (tcflag_t)0;
  68. s_new_termios.c_cflag = s_data_bits | CLOCAL | CREAD;
  69. s_new_termios.c_lflag = (tcflag_t)0;
  70. for(s_index = 0;s_index <>
  71. s_new_termios.c_cc[VMIN] = (cc_t)1;
  72. s_new_termios.c_cc[VTIME] = (cc_t)0;
  74. if(cfsetispeed((struct termios *)(&s_new_termios), s_baud) == 0 &&
  75. cfsetospeed((struct termios *)(&s_new_termios), s_baud) == 0)
  76. {
  77. if(tcsetattr(s_handle, TCSANOW, (struct termios *)(&s_new_termios)) == 0)
  78. {
  79. if(tcflush(s_handle, TCIOFLUSH) == 0)
  80. {
  81. (void)fprintf(stdout, "Ready serial\n");
  82. do
  83. {
  84. FD_ZERO(&s_fd_in);
  85. FD_SET(s_handle, &s_fd_in);
  86. s_timeval.tv_sec = (long)1, s_timeval.tv_usec = (long)0;
  87. s_check = select(s_handle + 1, (fd_set *)(&s_fd_in), (fd_set *)0, (fd_set *)0, (struct timeval *)(&s_timeval));
  88. if(s_check > 0)
  89. {
  90. s_read_bytes = read(s_handle, (void *)(&s_buffer[0]), (size_t)sizeof(s_buffer));
  91. if(s_read_bytes > ((ssize_t)0))
  92. {
  93. (void)fprintf(stdout, "recv data %d byte(s) {\n", (int)s_read_bytes);
  94. mz_dump(&s_buffer[0], s_read_bytes);
  95. (void)fprintf(stdout, "}\n");
  96. #if 1 /* echo part */
  97. s_write_bytes = write(s_handle, (void *)(&s_buffer[0]), (size_t)s_read_bytes);
  98. (void)fprintf(stdout, "echo %d/%d byte(s)\n", (int)s_write_bytes, (int)s_read_bytes);
  99. #endif
  100. }
  101. else if(s_read_bytes == ((ssize_t)0))(void)fprintf(stdout, "no data\n");
  102. else (void)perror("read");
  103. }
  104. else if(s_check == 0)(void)fprintf(stdout, "wait\n");
  105. else (void)perror("select");
  106. }while(g_mz_break == 0);
  107. (void)fprintf(stdout, "End of serial\n");
  108. }
  109. else (void)perror("tcflush");
  110. }
  111. else (void)perror("tcsetattr");
  112. }
  113. else (void)perror("cfset{i/o}speed");
  114. if(tcsetattr(s_handle, TCSANOW, (struct termios *)(&s_prev_termios)) != 0)(void)perror("tcsetattr(restore)");
  115. }
  116. else (void)perror("tcgetattr");
  117. (void)close(s_handle);
  118. }
  119. else (void)perror("open");
  120. return(1);
  121. }
  123. /* vim: set expandtab: */
  124. /* End of source */

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