이것은 간단히 Serial 통신을 하는 예제입니다.
serial로부터 받은 데이터를 고스란히 다시 반향하여 보내는 것입니다.
현재 코드는
로 만들어져 있습니다.
serial로부터 받은 데이터를 고스란히 다시 반향하여 보내는 것입니다.
현재 코드는
| 인용: |
| port=COM1 ("/dev/ttyS0")
baud=9600 parity=true stop=1 data=8bit |
| 코드: |
|
/* Copyright (C) Information Equipment co.,LTD All rights reserved. Code by JaeHyuk Cho <mailto:minzkn@infoeq.com> CVSTAG="$Header$" */ #include <sys/types.h> #include <sys/time.h> #include <stdio.h> #include <unistd.h> #include <fcntl.h> #include <malloc.h> #include <string.h> #include <memory.h> #include <signal.h> #include <errno.h> #include <termios.h> #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;\ 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_i<s_w;s_i++){if(s_i==8)printf(" | ");else printf(" ");\ 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]='.';}\ while(s_i<16){if(s_i==8)printf(" ");else printf(" ");s_b[s_i]=' ';s_i++;}\ printf(" [%s]\n",(char *)s_b);s_o+=16;}}else printf("error: dump null\n");}while(0) int g_mz_break = 0; void mz_my_signal(int s_signal) { switch(s_signal) { case SIGINT: g_mz_break = 1; (void)signal(s_signal, mz_my_signal); break; default: (void)fprintf(stdout, "unknown signal ! (%d)\n", s_signal); break; } } int main(void) { /* configuration */ char *s_device_name = "/dev/ttyS0"; speed_t s_baud = B9600; tcflag_t s_data_bits = CS8; int s_parity_bit = 1; int s_handle, s_index, s_check; struct termios s_prev_termios, s_new_termios; ssize_t s_read_bytes, s_write_bytes; struct timeval s_timeval; fd_set s_fd_in; unsigned char s_buffer[ 4 << 10 ]; (void)signal(SIGINT, mz_my_signal); s_handle = open(s_device_name, O_RDWR | O_NOCTTY); if(s_handle != (-1)) { if(tcgetattr(s_handle, (struct termios *)(&s_prev_termios)) == 0) { (void)memcpy((void *)(&s_new_termios), (void *)(&s_prev_termios), (size_t)sizeof(struct termios)); s_new_termios.c_iflag = IGNBRK | ((s_parity_bit == 0) ? ((tcflag_t)0) : IGNPAR); s_new_termios.c_oflag = (tcflag_t)0; s_new_termios.c_cflag = s_data_bits | CLOCAL | CREAD; s_new_termios.c_lflag = (tcflag_t)0; for(s_index = 0;s_index < NCCS;s_index++)s_new_termios.c_cc[s_index] = (cc_t)0; s_new_termios.c_cc[VMIN] = (cc_t)1; s_new_termios.c_cc[VTIME] = (cc_t)0; if(cfsetispeed((struct termios *)(&s_new_termios), s_baud) == 0 && cfsetospeed((struct termios *)(&s_new_termios), s_baud) == 0) { if(tcsetattr(s_handle, TCSANOW, (struct termios *)(&s_new_termios)) == 0) { if(tcflush(s_handle, TCIOFLUSH) == 0) { (void)fprintf(stdout, "Ready serial\n"); do { FD_ZERO(&s_fd_in); FD_SET(s_handle, &s_fd_in); s_timeval.tv_sec = (long)1, s_timeval.tv_usec = (long)0; s_check = select(s_handle + 1, (fd_set *)(&s_fd_in), (fd_set *)0, (fd_set *)0, (struct timeval *)(&s_timeval)); if(s_check > 0) { s_read_bytes = read(s_handle, (void *)(&s_buffer[0]), (size_t)sizeof(s_buffer)); if(s_read_bytes > ((ssize_t)0)) { (void)fprintf(stdout, "recv data %d byte(s) {\n", (int)s_read_bytes); mz_dump(&s_buffer[0], s_read_bytes); (void)fprintf(stdout, "}\n"); #if 1 /* echo part */ s_write_bytes = write(s_handle, (void *)(&s_buffer[0]), (size_t)s_read_bytes); (void)fprintf(stdout, "echo %d/%d byte(s)\n", (int)s_write_bytes, (int)s_read_bytes); #endif } else if(s_read_bytes == ((ssize_t)0))(void)fprintf(stdout, "no data\n"); else (void)perror("read"); } else if(s_check == 0)(void)fprintf(stdout, "wait\n"); else (void)perror("select"); }while(g_mz_break == 0); (void)fprintf(stdout, "End of serial\n"); } else (void)perror("tcflush"); } else (void)perror("tcsetattr"); } else (void)perror("cfset{i/o}speed"); if(tcsetattr(s_handle, TCSANOW, (struct termios *)(&s_prev_termios)) != 0)(void)perror("tcsetattr(restore)"); } else (void)perror("tcgetattr"); (void)close(s_handle); } else (void)perror("open"); return(1); } /* vim: set expandtab: */ /* End of source */ |
댓글을 달아 주세요