/*********************************************************************************
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* Copyright: (C) 2021 Guo Wenxue <guowenxue@gmail.com>
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* All rights reserved.
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*
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* Filename: comport.c
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* Description: This file used to do ioctl() on common device or communicate
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* with serial port/TTY device.
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*
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* Version: 1.0.0(5/1/2021~)
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* Author: Guo Wenxue <guowenxue@gmail.com>
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* ChangeLog: 1, Release initial version on "5/1/2021 10:08:05 AM"
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*
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********************************************************************************/
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#include <getopt.h>
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#include <libgen.h>
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#include <sys/ioctl.h>
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#include "comport.h"
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unsigned char g_stop = 0;
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unsigned char g_CtrlZ;
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void print_version(char *name);
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void usage(char *name);
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void signal_handler(int i_sig);
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void stdin_nonblock(void);
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int kbhit(void);
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int main(int argc, char **argv)
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{
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int opt = 0;
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int rv = 0;
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int i;
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comport_t comport;
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int baudrate = 115200;
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char *settings = "8N1N";
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char *dev_name = NULL;
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char buf[512];
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unsigned char disp_mode = 0x00;
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struct sigaction sigact;
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struct option long_options[] = {
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{"device", required_argument, NULL, 'd'},
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{"baudrate", required_argument, NULL, 'b'},
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{"settings", required_argument, NULL, 's'},
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{"hex", no_argument, NULL, 'x'},
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{"version", no_argument, NULL, 'v'},
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{"help", no_argument, NULL, 'h'},
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{NULL, 0, NULL, 0}
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};
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while ((opt = getopt_long(argc, argv, "d:b:s:xvh", long_options, NULL)) != -1)
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{
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switch (opt)
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{
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case 'd':
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dev_name = optarg;
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break;
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case 'b':
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baudrate = atoi(optarg);
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break;
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case 's': /* Default settings as 8N1N */
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settings = optarg;
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break;
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case 'x': /* Display receive data as Hex mode */
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disp_mode = 0x01;
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break;
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case 'v': /* version */
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print_version(argv[0]);
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return 0;
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case 'h': /* help */
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usage(argv[0]);
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return 0;
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default:
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break;
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} /* end of "switch(opt)" */
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}
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if (argc < 2)
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{
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usage(argv[0]);
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return 0;
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}
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if ( (rv=comport_open(&comport, dev_name, baudrate, settings)) < 0)
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{
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printf("Failed to open %s wth baudrate %d, %s. rv=%d\n", dev_name, baudrate, settings, rv);
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return -1;
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}
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stdin_nonblock();
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/* Process level signal handler */
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sigemptyset(&sigact.sa_mask);
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sigact.sa_flags = 0;
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sigact.sa_handler = signal_handler;
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sigaction(SIGTERM, &sigact, NULL); /* catch terminate signal */
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sigaction(SIGINT, &sigact, NULL); /* catch interrupt signal */
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sigaction(SIGSEGV, &sigact, NULL); /* catch segmentation faults */
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sigaction(SIGTSTP, &sigact, NULL); /* catch ctrl+Z */
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sigaction(SIGSTOP, &sigact, NULL); /* catch ctrl+Z */
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while ( !g_stop )
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{
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rv = comport_recv(&comport, buf, sizeof(buf) - 1, 10);
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if ( rv > 0)
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{
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for (i=0; i<rv ; i++)
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{
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if (0 == disp_mode)
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printf("%c", buf[i]);
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else
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printf("%02X ", buf[i]);
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}
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fflush(stdout);
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}
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if (0 != kbhit())
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{
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rv = fgetc(stdin);
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if (0x0A == rv)
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{
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buf[0] = 0x0D; /* 13 == 0x0D */
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}
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else
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{
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buf[0] = rv;
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}
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comport_send(&comport, buf, 1);
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}
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else if (0x00 != g_CtrlZ)
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{
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g_CtrlZ = 0x00;
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buf[0] = 0x1A;
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comport_send(&comport, buf, 1);
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}
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}
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comport_close(&comport);
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return 0;
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} /* ----- End of main() ----- */
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void print_version(char *name)
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{
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char *progname = NULL;
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char *ptr = NULL;
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ptr = strdup(name);
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progname = basename(ptr);
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printf("%s v1.0.0 Build on %s\n", progname, __DATE__);
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printf("Copyright (C) 2021 guowenxue <guowenxue@gmail.com>\n");
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free(ptr);
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return;
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}
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void usage(char *name)
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{
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char *progname = NULL;
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char *ptr = NULL;
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ptr = strdup(name);
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progname = basename(ptr);
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printf("Usage: comport -d <device> [-b <baudrate>][-s <settings>] [-x]\n");
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printf(" -d[device ] device name, such as /dev/ttyUSB0\n");
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printf(" -b[baudrate] device baudrate (115200, 57600, 19200, 9600), default is 115200\n");
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printf(" -s[settings] device settings as like 8N1N(defalt setting)\n");
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printf(" - data bits: 8, 7\n");
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printf(" - parity: N=None, O=Odd, E=Even, S=Space\n");
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printf(" - stop bits: 1, 0\n");
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printf(" - flow control: N=None, H=Hardware, S=Software, B=Both\n");
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printf(" -x[hex ] display received data in hex format\n");
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printf(" -v[version ] Display the program version\n");
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printf(" -h[help ] Display this help information\n");
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print_version(progname);
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free(ptr);
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return;
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}
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void signal_handler(int signum)
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{
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if (SIGTERM == signum || SIGINT == signum)
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{
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g_stop = 1;
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}
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else if (SIGTSTP == signum)
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{
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g_CtrlZ = 1;
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}
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}
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void stdin_nonblock(void)
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{
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struct termios ttystate;
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//get the terminal state
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tcgetattr(STDIN_FILENO, &ttystate);
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//turn off canonical mode
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ttystate.c_lflag &= ~ICANON;
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//minimum of number input read.
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ttystate.c_cc[VMIN] = 1;
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//set the terminal attributes.
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tcsetattr(STDIN_FILENO, TCSANOW, &ttystate);
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}
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int kbhit(void)
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{
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struct timeval tv;
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fd_set fds;
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tv.tv_sec = 0;
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tv.tv_usec = 0;
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FD_ZERO(&fds);
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FD_SET(STDIN_FILENO, &fds); //STDIN_FILENO is 0
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select(STDIN_FILENO + 1, &fds, NULL, NULL, &tv);
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return FD_ISSET(STDIN_FILENO, &fds);
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}
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