serial port를 logging 하자-

이 글은 http://heestory.kr/252 글에 추가적인 설명을 더하고 싶어서 작성하였습니다.

리눅스에서 minicom을 사용하여 serial port를 사용할 수 있기는 하지만, 매번 띄어놓을수도 없고-_-;..

기록으로 남겨놓기도 그렇고....또- minicom으로 기록을 남기면 혼자밖에 못보고.. 시간도 안남고 해서..

예전 빨간책(http://www.yes24.com/24/goods/2647096)에서 시리얼을 제어하는 부분이 생각나서 인터넷을 찾아봤습니다. ( 제 책은 어디론가 사라졌어요ㅠㅠ) 

샘플 코드는 쉽게 찾을 수 있었고(http://tldp.org/HOWTO/Serial-Programming-HOWTO/x115.html), 시간만 추가적으로 기록해서 시간대별로 파일에 쓰도록 했습니다.

코드에 대한 자세한 설명은 Beginning Linux Programming 을 참고하세요..(자세하게 나왔었던 기억이..)

#include <stdlib.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <termios.h> #include <stdio.h> #include <sys/time.h> #include <time.h> #include <string.h> /* baudrate settings are defined in <asm/termbits.h>, which is included by <termios.h> */ #define BAUDRATE B115200 /* change this definition for the correct port */ #define MODEMDEVICE "/dev/ttyUSB0" #define _POSIX_SOURCE 1 /* POSIX compliant source */ #define FALSE 0 #define TRUE 1 #define BUFSIZE 1024 volatile int STOP=FALSE; main() { int fd,c, res; struct termios oldtio,newtio; char buf[BUFSIZE]; struct timeval tv; struct tm* lt; struct tm lts; char filename[256] = {0,}; FILE *fp; /* Open modem device for reading and writing and not as controlling tty because we don't want to get killed if linenoise sends CTRL-C. */ fd = open(MODEMDEVICE, O_RDWR | O_NOCTTY ); if (fd <0) {perror(MODEMDEVICE); exit(-1); } tcgetattr(fd,&oldtio); /* save current serial port settings */ bzero(&newtio, sizeof(newtio)); /* clear struct for new port settings */ /* BAUDRATE: Set bps rate. You could also use cfsetispeed and cfsetospeed. CRTSCTS : output hardware flow control (only used if the cable has all necessary lines. See sect. 7 of Serial-HOWTO) CS8 : 8n1 (8bit,no parity,1 stopbit) CLOCAL : local connection, no modem contol CREAD : enable receiving characters */ newtio.c_cflag = BAUDRATE | CRTSCTS | CS8 | CLOCAL | CREAD; /* IGNPAR : ignore bytes with parity errors ICRNL : map CR to NL (otherwise a CR input on the other computer will not terminate input) otherwise make device raw (no other input processing) */ newtio.c_iflag = IGNPAR | ICRNL; /* Raw output. */ newtio.c_oflag = 0; /* ICANON : enable canonical input disable all echo functionality, and don't send signals to calling program */ newtio.c_lflag = ICANON; /* initialize all control characters default values can be found in /usr/include/termios.h, and are given in the comments, but we don't need them here */ newtio.c_cc[VINTR] = 0; /* Ctrl-c */ newtio.c_cc[VQUIT] = 0; /* Ctrl-\ */ newtio.c_cc[VERASE] = 0; /* del */ newtio.c_cc[VKILL] = 0; /* @ */ newtio.c_cc[VEOF] = 4; /* Ctrl-d */ newtio.c_cc[VTIME] = 0; /* inter-character timer unused */ newtio.c_cc[VMIN] = 1; /* blocking read until 1 character arrives */ newtio.c_cc[VSWTC] = 0; /* '\0' */ newtio.c_cc[VSTART] = 0; /* Ctrl-q */ newtio.c_cc[VSTOP] = 0; /* Ctrl-s */ newtio.c_cc[VSUSP] = 0; /* Ctrl-z */ newtio.c_cc[VEOL] = 0; /* '\0' */ newtio.c_cc[VREPRINT] = 0; /* Ctrl-r */ newtio.c_cc[VDISCARD] = 0; /* Ctrl-u */ newtio.c_cc[VWERASE] = 0; /* Ctrl-w */ newtio.c_cc[VLNEXT] = 0; /* Ctrl-v */ newtio.c_cc[VEOL2] = 0; /* '\0' */ /* now clean the modem line and activate the settings for the port */ tcflush(fd, TCIFLUSH); tcsetattr(fd,TCSANOW,&newtio); /* terminal settings done, now handle input In this example, inputting a 'z' at the beginning of a line will exit the program. */ while (STOP==FALSE) { /* loop until we have a terminating condition */ /* read blocks program execution until a line terminating character is input, even if more than BUFSIZE chars are input. If the number of characters read is smaller than the number of chars available, subsequent reads will return the remaining chars. res will be set to the actual number of characters actually read */ /* begin : otto-090904a, insert time */ res = read(fd,buf,BUFSIZE); if ( res <= 0 ) { fprintf(stderr,"read fail!"); continue; } buf[res]=0; /* set end of string, so we can printf */ gettimeofday(&tv, NULL); lt = localtime_r(&tv.tv_sec, <s); sprintf(filename,"minicomlog_%d_%d_%d",lt->tm_mon+1, lt->tm_mday,lt->tm_hour); fp = fopen(filename, "a"); if ( fp == NULL ) { fprintf(stderr,"fileopen error. filename(%s)\n",filename); return; } fprintf(fp, "%02d%02d %02d:%02d:%02d.%04d > (LEN:%d) %s", lt->tm_mon+1, lt->tm_mday, lt->tm_hour, lt->tm_min, lt->tm_sec, (int)tv.tv_usec/* / 100*/, res, buf); fclose(fp); //if (buf[0]=='z') STOP=TRUE; } /* restore the old port settings */ tcsetattr(fd,TCSANOW,&oldtio); }

p.s. 단순히 serial로 들어오는 입력을 기록하는 용도입니다. 입력은 불가능 합니다^-^;