59 lines
1.7 KiB
C
59 lines
1.7 KiB
C
|
#include <fcntl.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <sys/stat.h>
|
||
|
|
#include <termios.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
|
||
|
|
#include "serial.h"
|
||
|
|
|
||
|
|
int
|
||
|
|
serial_open(const char *path, speed_t bps)
|
||
|
|
{
|
||
|
|
int fd;
|
||
|
|
struct termios otio;
|
||
|
|
struct termios ntio;
|
||
|
|
|
||
|
|
fd = open(path, O_RDWR | O_NOCTTY | O_NDELAY);
|
||
|
|
if (fd == -1) {
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
tcgetattr(fd, &otio);
|
||
|
|
tcgetattr(fd, &ntio);
|
||
|
|
|
||
|
|
cfsetispeed(&ntio, bps);
|
||
|
|
cfsetospeed(&ntio, bps);
|
||
|
|
|
||
|
|
/* https://www.cmrr.umn.edu/~strupp/serial.html */
|
||
|
|
/* 8N1 */
|
||
|
|
ntio.c_cflag |= (CLOCAL | CREAD);
|
||
|
|
ntio.c_cflag &= ~(CSIZE|PARENB|CSTOPB);
|
||
|
|
ntio.c_cflag |= (CS8); /* Set size after setting CSIZE mask */
|
||
|
|
ntio.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON|IXOFF|IXANY);
|
||
|
|
ntio.c_oflag &= ~(OPOST);
|
||
|
|
ntio.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
|
||
|
|
|
||
|
|
ntio.c_cc[VINTR] = 0; /* Ctrl-c */
|
||
|
|
ntio.c_cc[VQUIT] = 0; /* Ctrl-\ */
|
||
|
|
ntio.c_cc[VERASE] = 0; /* del */
|
||
|
|
ntio.c_cc[VKILL] = 0; /* @ */
|
||
|
|
ntio.c_cc[VEOF] = 4; /* Ctrl-d */
|
||
|
|
ntio.c_cc[VTIME] = 0; /* inter-character timer unused */
|
||
|
|
ntio.c_cc[VMIN] = 0; /* non-blocking */
|
||
|
|
ntio.c_cc[VSWTC] = 0; /* '\0' */
|
||
|
|
ntio.c_cc[VSTART] = 0; /* Ctrl-q */
|
||
|
|
ntio.c_cc[VSTOP] = 0; /* Ctrl-s */
|
||
|
|
ntio.c_cc[VSUSP] = 0; /* Ctrl-z */
|
||
|
|
ntio.c_cc[VEOL] = 0; /* '\0' */
|
||
|
|
ntio.c_cc[VREPRINT] = 0; /* Ctrl-r */
|
||
|
|
ntio.c_cc[VDISCARD] = 0; /* Ctrl-u */
|
||
|
|
ntio.c_cc[VWERASE] = 0; /* Ctrl-w */
|
||
|
|
ntio.c_cc[VLNEXT] = 0; /* Ctrl-v */
|
||
|
|
ntio.c_cc[VEOL2] = 0; /* '\0' */
|
||
|
|
|
||
|
|
tcflush(fd, TCIFLUSH);
|
||
|
|
tcsetattr(fd, TCSANOW, &ntio);
|
||
|
|
|
||
|
|
return fd;
|
||
|
|
}
|