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#include <stdlib.h>
#include <fcntl.h>
#include <termios.h>
#include <unistd.h>
int tty_open(char *tty_fn) {
struct termios tty;
int tty_fd;
int rv;
tty_fd = open(tty_fn, O_RDWR);
if (tty_fd < 0) return tty_fd;
rv = tcgetattr(tty_fd, &tty);
if (rv) return -1;
tty.c_cflag &= ~PARENB; // No parity
tty.c_cflag &= ~CSTOPB; // One stop bit
tty.c_cflag &= ~CSIZE; // Clear all bits that set the data size
tty.c_cflag |= CS8; // 8 bits per byte
tty.c_cflag &= ~CRTSCTS; // Disable RTS/CTS hw flow control
tty.c_cflag |= (CREAD | CLOCAL); // Turn on READ & ignore ctrl lines (CLOCAL = 1)
tty.c_lflag &= ~ICANON;
tty.c_lflag &= ~(ECHO | ECHOE |ECHONL); // Disable echo
tty.c_lflag &= ~ISIG; // Disable interpretation of INTR, QUIT and SUSP signals
tty.c_iflag &= ~(IXON | IXOFF | IXANY); // Turn off sw flow ctrl
tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL); // Disable any special handling of received bytes
tty.c_oflag &= ~OPOST; // Prevent special interpretation of output bytes (e.g. newline chars)
tty.c_oflag &= ~ONLCR; // Prevent conversion of newline to carriage return/line feed
#ifndef __linux__
tty.c_oflag &= ~OXTABS; // Prevent conversion of tabs to spaces (NOT PRESENT ON LINUX)
tty.c_oflag &= ~ONOEOT; // Prevent removal of C-d chars (0x004) in output (NOT PRESENT ON LINUX)
#endif
tty.c_cc[VTIME] = 10; // Wait for up to 1s (10 deciseconds), returning as soon as any data is received.
tty.c_cc[VMIN] = 0;
cfsetispeed(&tty, B115200);
cfsetospeed(&tty, B115200);
rv = tcsetattr(tty_fd, TCSANOW, &tty);
if (rv) return -1;
return tty_fd;
};
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