101 lines
1.7 KiB
C
101 lines
1.7 KiB
C
/*
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* serial.c - Send data to a Modela MDX-15/20
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*
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* Written 2009 by Werner Almesberger
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* Copyright 2009 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdarg.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <termios.h>
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#include <sys/types.h>
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#include "serial.h"
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static int tty;
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static struct termios old;
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static void reset_tty(void)
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{
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if (tty >= 0)
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if (tcsetattr(tty, TCSADRAIN, &old) < 0)
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perror("tcsetattr");
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}
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void serial_open(const char *name)
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{
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struct termios new;
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tty = open(name, O_WRONLY | O_NOCTTY);
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if (tty < 0) {
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perror(name);
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exit(1);
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}
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if (tcgetattr(tty, &old) < 0) {
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perror("tcgetattr");
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exit(1);
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}
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atexit(reset_tty);
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new = old;
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cfmakeraw(&new);
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cfsetospeed(&new, B9600);
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new.c_iflag |= IXON;
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new.c_cflag |= CLOCAL | CRTSCTS;
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new.c_lflag &= ~ECHO;
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if (tcsetattr(tty, TCSAFLUSH, &new) < 0) {
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perror("tcsetattr");
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exit(1);
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}
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}
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void serial_close(void)
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{
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reset_tty();
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(void) close(tty);
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tty = -1;
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}
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void serial_printf(const char *fmt, ...)
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{
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char buf[10000]; /* more than enough :) */
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va_list ap;
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int len;
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ssize_t wrote;
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va_start(ap, fmt);
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len = vsnprintf(buf, sizeof(buf), fmt, ap);
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va_end(ap);
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if (len >= sizeof(buf)-1) {
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fprintf(stderr, "buffer too small\n");
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exit(1);
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}
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wrote = write(tty, buf, strlen(buf));
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if (wrote < 0) {
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perror("write");
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exit(1);
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}
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if (wrote != len) {
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fprintf(stderr, "short write: %d < %d\n",
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(int) wrote, (int) len);
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exit(1);
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}
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}
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