altos: add APRS 'offset' value to set APRS transmision time
[fw/altos] / src / kernel / ao_telemetry.c
index 2092c84f403cd65606eeb78078a3d64d7f689ab6..c2b2eb5a1bad0569d909481c21caf20773269457 100644 (file)
@@ -443,6 +443,28 @@ ao_send_companion(void)
 }
 #endif
 
+#if HAS_APRS
+static void
+ao_set_aprs_time(void)
+{
+       uint16_t interval = ao_config.aprs_interval;
+
+       if ((ao_gps_data.flags & AO_GPS_DATE_VALID) && interval != 0) {
+               int second = (ao_gps_data.second / interval + 1) * interval + ao_config.aprs_offset;
+               int delta;
+               if (second >= 60) {
+                       second = ao_config.aprs_offset;
+                       delta = second + 60 - ao_gps_data.second;
+               } else {
+                       delta = second - ao_gps_data.second;
+               }
+               ao_aprs_time = ao_gps_tick + AO_SEC_TO_TICKS(delta);
+       } else {
+               ao_aprs_time += AO_SEC_TO_TICKS(ao_config.aprs_interval);
+       }
+}
+#endif
+
 static void
 ao_telemetry(void)
 {
@@ -471,6 +493,7 @@ ao_telemetry(void)
 #endif
 #if HAS_APRS
                ao_aprs_time = time;
+               ao_set_aprs_time();
 #endif
                while (ao_telemetry_interval) {
                        time = ao_time() + AO_SEC_TO_TICKS(100);
@@ -539,7 +562,7 @@ ao_telemetry(void)
 #if HAS_APRS
                        if (ao_config.aprs_interval != 0) {
                                if ((int16_t) (ao_time() - ao_aprs_time) >= 0) {
-                                       ao_aprs_time = ao_time() + AO_SEC_TO_TICKS(ao_config.aprs_interval);
+                                       ao_set_aprs_time();
                                        ao_aprs_send();
                                }
                                if ((int16_t) (time - ao_aprs_time) > 0)