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/*
* Copyright © 2009 Keith Packard <keithp@keithp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "ao.h"
__xdata struct ao_task ao_gps_task;
#define AO_GPS_MAX_LINE 80
#define AO_GPS_LEADER 6
__xdata uint8_t ao_gps_line[AO_GPS_MAX_LINE+1] = "GPGGA,";
__xdata uint8_t ao_gps_mutex;
__xdata uint8_t ao_gps_data;
const uint8_t ao_gps_config[] =
"$PSRF103,00,00,01,01*25\r\n" /* GGA 1 per sec */
"$PSRF103,01,00,00,01*25\r\n" /* GLL disable */
"$PSRF103,02,00,00,01*26\r\n" /* GSA disable */
"$PSRF103,03,00,00,01*27\r\n" /* GSV disable */
"$PSRF103,04,00,00,01*20\r\n" /* RMC disable */
"$PSRF103,05,00,00,01*21\r\n"; /* VTG disable */
void
ao_gps(void)
{
uint8_t c;
uint8_t i;
for (i = 0; (c = ao_gps_config[i]); i++)
ao_serial_putchar(c);
for (;;) {
for (;;) {
c = ao_serial_getchar();
if (c == '$')
break;
}
for (i = 0; i < AO_GPS_LEADER; i++)
if (ao_serial_getchar() != ao_gps_line[i])
break;
if (i != AO_GPS_LEADER)
continue;
ao_mutex_get(&ao_gps_mutex);
for (;;) {
c = ao_serial_getchar();
if (c < ' ')
break;
if (i < AO_GPS_MAX_LINE)
ao_gps_line[i++] = c;
}
ao_gps_line[i] = '\0';
ao_gps_data = 1;
ao_mutex_put(&ao_gps_mutex);
ao_wakeup(&ao_gps_data);
puts(ao_gps_line);
ao_usb_flush();
}
}
void
ao_gps_init(void)
{
ao_add_task(&ao_gps_task, ao_gps);
}
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