#endif
#include <ao_aprs.h>
+#include <math.h>
// Public methods, constants, and data structures for each class.
/// AX.25 compliant packet header that contains destination, station call sign, and path.
/// 0x76 for SSID-11, 0x78 for SSID-12
-static const uint8_t TNC_AX25_HEADER[] = {
- 'A' << 1, 'P' << 1, 'A' << 1, 'M' << 1, ' ' << 1, ' ' << 1, 0x60, \
- 'K' << 1, 'D' << 1, '7' << 1, 'S' << 1, 'Q' << 1, 'G' << 1, 0x78, \
- 'W' << 1, 'I' << 1, 'D' << 1, 'E' << 1, '2' << 1, ' ' << 1, 0x65, \
+static uint8_t TNC_AX25_HEADER[] = {
+ 'A' << 1, 'P' << 1, 'A' << 1, 'M' << 1, ' ' << 1, ' ' << 1, 0x60,
+ 'N' << 1, '0' << 1, 'C' << 1, 'A' << 1, 'L' << 1, 'L' << 1, 0x78,
+ 'W' << 1, 'I' << 1, 'D' << 1, 'E' << 1, '2' << 1, ' ' << 1, 0x65,
0x03, 0xf0 };
+#define TNC_CALLSIGN_OFF 7
+#define TNC_CALLSIGN_LEN 6
+
+static void
+tncSetCallsign(void)
+{
+#ifndef AO_APRS_TEST
+ uint8_t i;
+
+ for (i = 0; i < TNC_CALLSIGN_LEN; i++) {
+ if (!ao_config.callsign[i])
+ break;
+ TNC_AX25_HEADER[TNC_CALLSIGN_OFF + i] = ao_config.callsign[i] << 1;
+ }
+ for (; i < TNC_CALLSIGN_LEN; i++)
+ TNC_AX25_HEADER[TNC_CALLSIGN_OFF + i] = ' ' << 1;
+#endif
+}
+
/// The next bit to transmit.
static uint8_t tncTxBit;
} // END switch
}
+static void tncCompressInt(uint8_t *dest, int32_t value, int len) {
+ int i;
+ for (i = len - 1; i >= 0; i--) {
+ dest[i] = value % 91 + 33;
+ value /= 91;
+ }
+}
+
/**
* Generate the plain text position packet.
*/
int32_t latitude = ao_gps_data.latitude;
int32_t longitude = ao_gps_data.longitude;
int32_t altitude = ao_gps_data.altitude;
+ uint8_t *buf;
+ if (altitude < 0)
+ altitude = 0;
+ altitude = (altitude * (int32_t) 10000 + (3048/2)) / (int32_t) 3048;
+
+#if 0
+ char lat_sign = 'N', lon_sign = 'E';
uint16_t lat_deg;
uint16_t lon_deg;
uint16_t lat_min;
uint16_t lon_min;
uint16_t lon_frac;
- char lat_sign = 'N', lon_sign = 'E';
-
if (latitude < 0) {
lat_sign = 'S';
latitude = -latitude;
longitude = -longitude;
}
+ /* Round latitude and longitude by 0.005 minutes */
+ latitude = latitude + 833;
+ if (latitude > 900000000)
+ latitude = 900000000;
+ longitude = longitude + 833;
+ if (longitude > 1800000000)
+ longitude = 1800000000;
+
lat_deg = latitude / 10000000;
latitude -= lat_deg * 10000000;
latitude *= 60;
lat_min = latitude / 10000000;
latitude -= lat_min * 10000000;
- lat_frac = (latitude + 50000) / 100000;
+ lat_frac = latitude / 100000;
lon_deg = longitude / 10000000;
longitude -= lon_deg * 10000000;
longitude *= 60;
lon_min = longitude / 10000000;
longitude -= lon_min * 10000000;
- lon_frac = (longitude + 50000) / 100000;
+ lon_frac = longitude / 100000;
- if (altitude < 0)
- altitude = 0;
-
- altitude = altitude * (int32_t) 1000 / (int32_t) 3048;
-
+#if 0
return sprintf ((char *) tncBuffer, "=%02u%02u.%02u%c\\%03u%02u.%02u%cO /A=%06u\015",
lat_deg, lat_min, lat_frac, lat_sign,
lon_deg, lon_min, lon_frac, lon_sign,
altitude);
+#endif
+
+ return sprintf ((char *) tncBuffer, "/%02u%02u%02uh%02u%02u.%02u%c/%03u%02u.%02u%c'/A=%06u\015",
+ ao_gps_data.hour,
+ ao_gps_data.minute,
+ ao_gps_data.second,
+ lat_deg, lat_min, lat_frac, lat_sign,
+ lon_deg, lon_min, lon_frac, lon_sign,
+ altitude);
+#endif
+ buf = tncBuffer;
+#if APRS_TIME
+ sprintf ((char *) buf, "/%02u%02u%02uh",
+ ao_gps_data.hour,
+ ao_gps_data.minute,
+ ao_gps_data.second);
+ buf += 8;
+#else
+ *buf++ = '!';
+#endif
+
+ /* Symbol table ID */
+ *buf++ = '/';
+
+ latitude = ((uint64_t) 380926 * (900000000 - latitude)) / 10000000;
+ longitude = ((uint64_t) 190463 * (1800000000 + longitude)) / 10000000;
+
+#define ALTITUDE_LOG_BASE 0.001998002662673f /* log(1.002) */
+
+ altitude = logf((float) altitude) * (1/ALTITUDE_LOG_BASE);
+
+ tncCompressInt(buf, latitude, 4);
+ buf += 4;
+ tncCompressInt(buf, longitude, 4);
+ buf += 4;
+
+ /* Symbol code */
+ *buf++ = '\'';
+
+ tncCompressInt(buf, altitude, 2);
+ buf += 2;
+
+ *buf++ = 33 + ((1 << 5) | (2 << 3));
+ *buf++ = '\0';
+ return buf - tncBuffer;
}
static int16_t
timeInit();
tncInit();
+ tncSetCallsign();
tncLength = tncPositionPacket();
tncIndex = 0;
tncMode = TNC_TX_SYNC;
- ao_radio_send_lots(tncFill);
+ ao_radio_send_aprs(tncFill);
}
/** @} */