+
−/*
+
− * This module takes care of opening the serial port and setting the
+
− * proper "raw" termios modes, including the baud rate.
+
− */
+
−
+
−#include <sys/types.h>
+
−#include <sys/file.h>
+
−#include <sys/ioctl.h>
+
−#include <termios.h>
+
−#include <stdio.h>
+
−#include <stdlib.h>
+
−#include <string.h>
+
−#include <strings.h>
+
−#include <unistd.h>
+
−
+
−int target_fd;
+
−char *baudrate_name = "115200";
+
−
+
−static struct baudrate {
+
−	char	*name;
+
−	speed_t	termios_code;
+
−} baud_rate_table[] = {
+
−	{"19200",	B19200},
+
−	{"38400",	B38400},
+
−	{"57600",	B57600},
+
−	{"115200",	B115200},
+
−	/* non-standard high baud rates "remapped" by CP2102 usb2serial IC */
+
−	{"203125",	B230400},
+
−	{"406250",	B460800},
+
−	{"812500",	B921600},
+
−	/* table search terminator */
+
−	{NULL,		B0}
+
−};
+
−
+
−static speed_t
+
−get_baud_rate()
+
−{
+
−	struct baudrate *br;
+
−
+
−	for (br = baud_rate_table; br->name; br++)
+
−		if (!strcmp(br->name, baudrate_name))
+
−			break;
+
−	if (!br->name) {
+
−		fprintf(stderr, "baud rate \"%s\" unknown/unsupported\n",
+
−			baudrate_name);
+
−		exit(1);
+
−	}
+
−	return br->termios_code;
+
−}
+
−
+
−open_target_serial(ttydev)
+
−	char *ttydev;
+
−{
+
−	struct termios target_termios;
+
−	speed_t br_code;
+
−
+
−	br_code = get_baud_rate();
+
−	target_fd = open(ttydev, O_RDWR|O_NONBLOCK);
+
−	if (target_fd < 0) {
+
−		perror(ttydev);
+
−		exit(1);
+
−	}
+
−	target_termios.c_iflag = IGNBRK;
+
−	target_termios.c_oflag = 0;
+
−	target_termios.c_cflag = CLOCAL|HUPCL|CREAD|CS8;
+
−	target_termios.c_lflag = 0;
+
−	target_termios.c_cc[VMIN] = 1;
+
−	target_termios.c_cc[VTIME] = 0;
+
−	cfsetispeed(&target_termios, br_code);
+
−	cfsetospeed(&target_termios, br_code);
+
−	if (tcsetattr(target_fd, TCSAFLUSH, &target_termios) < 0) {
+
−		perror("initial tcsetattr on target");
+
−		exit(1);
+
−	}
+
−	return 0;
+
−}
+
−
+
−set_serial_nonblock(state)
+
−	int state;
+
−{
+
−	ioctl(target_fd, FIONBIO, &state);
+
−}