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112 lines
2.7 KiB
112 lines
2.7 KiB
/***************************************************************************
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* linux_gps.c
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*
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* Copyright 2010 - Steffen Pohle
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* steffen@gulpe.de
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****************************************************************************/
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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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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <string.h>
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#include <errno.h>
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#include "gps.h"
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#include "system.h"
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int gpsdev_fd = 0;
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char gpsdev_device[GPS_DEVICELEN];
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int gpsdev_baud = 0;
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void gps_serial_settings () {
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char *cfg = gps_get_device ();
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char baud[16];
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int i, c, d;
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if (cfg == NULL) return;
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memset (gpsdev_device, 0x0, GPS_DEVICELEN);
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memset (baud, 0x0, 16);
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for (i = 0, c = 0, d = 0; c < GPS_DEVICELEN && cfg[c] != 0; c++) {
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if (cfg[c] == ':') {
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i = 1;
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d = 0;
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}
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else if (cfg[c] == ',') {
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i++;
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d = 0;
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}
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else if (i == 1) { /* gpsdev_device ... tty port */
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gpsdev_device[d++] = cfg[c];
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}
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else if (i == 2 && d < 16) { /* baud rate */
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baud[d++] = cfg[c];
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}
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}
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};
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int gps_serial_device_open () {
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gps_serial_settings ();
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gpsdev_fd = open(gpsdev_device, O_RDWR | O_NOCTTY | O_NONBLOCK);
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if (gpsdev_fd >= 0)
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return 1;
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else {
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d_printf ("%s:%d gps_serial_device_open open tty device '%s' failed: %s",
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__FILE__, __LINE__, gpsdev_device, strerror(errno));
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return 0;
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}
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};
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void gps_serial_device_close () {
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if (gpsdev_fd <= 0) return;
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close (gpsdev_fd);
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gpsdev_fd = 0;
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};
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int gps_serial_device_read (char *ptr, int ptrsize) {
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fd_set rfds;
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struct timeval tv;
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int retval;
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if (gpsdev_fd <= 0) return -1;
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/* Watch stdin (fd 0) to see when it has input. */
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FD_ZERO(&rfds);
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FD_SET(gpsdev_fd, &rfds);
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tv.tv_sec = 0;
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tv.tv_usec = 0;
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retval = select(gpsdev_fd+1, &rfds, NULL, NULL, &tv);
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if (retval == -1) {
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d_printf ("%s:%d gps_serial_device_read error: %s", __FILE__, __LINE__, strerror(errno));
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return -1;
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}
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else if (retval) {
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if (FD_ISSET(gpsdev_fd, &rfds))
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return read (gpsdev_fd, ptr, ptrsize);
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}
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else
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return 0;
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return -1;
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};
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