X-Git-Url: https://git.gag.com/?p=fw%2Faltos;a=blobdiff_plain;f=src%2Fdrivers%2Fao_aprs.c;h=96e90f0027f080faa4015d660bcdaab7ecaa85de;hp=e3abe52eff9758eb0e6984d5a7888591c3a38d16;hb=9d812b3db418fd9816731b761a0853eb38f5a265;hpb=bd05421991b596fe9cf73ee25c9046b0fb4e32f7

diff --git a/src/drivers/ao_aprs.c b/src/drivers/ao_aprs.c
index e3abe52e..96e90f00 100644
--- a/src/drivers/ao_aprs.c
+++ b/src/drivers/ao_aprs.c
@@ -144,6 +144,7 @@
 #endif
 
 #include <ao_aprs.h>
+#include <math.h>
 
 // Public methods, constants, and data structures for each class.
 
@@ -254,9 +255,9 @@ typedef enum
 /// AX.25 compliant packet header that contains destination, station call sign, and path.
 /// 0x76 for SSID-11, 0x78 for SSID-12
 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, \
+    '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
@@ -265,6 +266,7 @@ static uint8_t TNC_AX25_HEADER[] = {
 static void
 tncSetCallsign(void)
 {
+#ifndef AO_APRS_TEST
 	uint8_t	i;
 
 	for (i = 0; i < TNC_CALLSIGN_LEN; i++) {
@@ -274,7 +276,7 @@ tncSetCallsign(void)
 	}
 	for (; i < TNC_CALLSIGN_LEN; i++)
 		TNC_AX25_HEADER[TNC_CALLSIGN_OFF + i] = ' ' << 1;
-		
+#endif
 }
 
 /// The next bit to transmit.
@@ -478,6 +480,14 @@ static void tnc1200TimerTick()
     } // 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.
  */
@@ -486,7 +496,14 @@ static int tncPositionPacket(void)
     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;
@@ -494,8 +511,6 @@ static int tncPositionPacket(void)
     uint16_t	lon_min;
     uint16_t	lon_frac;
 
-    char	lat_sign = 'N', lon_sign = 'E';
-
     if (latitude < 0) {
 	lat_sign = 'S';
 	latitude = -latitude;
@@ -506,29 +521,78 @@ static int tncPositionPacket(void)
 	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
@@ -584,7 +648,7 @@ void ao_aprs_send(void)
     tncIndex = 0;
     tncMode = TNC_TX_SYNC;
 
-    ao_radio_send_lots(tncFill);
+    ao_radio_send_aprs(tncFill);
 }
 
 /** @} */