serial.hpp

#include <errno.h>
#include <fcntl.h> 
#include <stdio.h>
#include <termios.h>
#include <stdlib.h>		/* getenv(), etc. */
#include <unistd.h>		/* sleep(), etc.  */
#include <stdint.h>
#include <string.h>
#include <string>
#include <map>

using string = std::string;


speed_t str2baud(string baudstring) {
	std::map<string, speed_t> baudmap = {
		{"115200", B115200} , {"230400", B230400}, {"57600", B57600}, {"38400", B38400}, {"19200", B19200}, {"9600", B9600}, {"4800", B4800}, {"2400", B2400}, {"1800", B1800}, {"1200", B1200}, {"600", B600}, {"300", B300}, {"200", B200}, {"150", B150}, {"134", B134}, {"110", B110}, {"75", B75}, {"50", B50}
	};
	printf("Map: %d\n", baudmap[baudstring]);
	return baudmap[baudstring];
}


int set_interface_attribs(int fd, int speed) {
	struct termios tty;

	if (tcgetattr(fd, &tty) < 0) {
		printf("Error from tcgetattr: %s\n", strerror(errno));
		return -1;
	}

	cfsetospeed(&tty, (speed_t)speed);
	cfsetispeed(&tty, (speed_t)speed);

	tty.c_cflag |= (CLOCAL | CREAD);    /* ignore modem controls */
	tty.c_cflag &= ~CSIZE;
	tty.c_cflag |= CS8;         /* 8-bit characters */
	tty.c_cflag &= ~PARENB;     /* no parity bit */
	tty.c_cflag &= ~CSTOPB;     /* only need 1 stop bit */
	tty.c_cflag &= ~CRTSCTS;    /* no hardware flowcontrol */

	tty.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
	tty.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
	tty.c_oflag &= ~OPOST;

	/* fetch bytes as they become available */
	tty.c_cc[VMIN] = 1;
	tty.c_cc[VTIME] = 1;

	if (tcsetattr(fd, TCSANOW, &tty) != 0) {
		printf("Error from tcsetattr: %s\n", strerror(errno));
		return -1;
	}
	return 0;
}

void set_mincount(int fd, int mcount) {
	struct termios tty;

	if (tcgetattr(fd, &tty) < 0) {
		printf("Error tcgetattr: %s\n", strerror(errno));
		return;
	}

	tty.c_cc[VMIN] = mcount ? 1 : 0;
	tty.c_cc[VTIME] = 5;        /* half second timer */

	if (tcsetattr(fd, TCSANOW, &tty) < 0)
		printf("Error tcsetattr: %s\n", strerror(errno));
}