support private LTM 'a' (amps) frame

stronnag · Sep 11, 2021 · 422ee57 · 422ee57
1 parent 76f9f73
commit 422ee57
Showing 1 changed file with 10 additions and 0 deletions.
diff --git a/pkg/ltmgen/ltmgen.go b/pkg/ltmgen/ltmgen.go
@@ -38,6 +38,8 @@ func newLTM(mtype byte) *ltmbuf {
 		paylen = 1
 	case 'q':
 		paylen = 2
+	case 'a':
+		paylen = 2
 	default:
 		log.Fatalf("LTM: No payload defined for type '%c'\n", mtype)
 	}
@@ -72,6 +74,11 @@ func (l *ltmbuf) aframe(b types.LogItem) {
 	l.checksum()
 }
 
+func (l *ltmbuf) paframe(b types.LogItem) {
+	binary.LittleEndian.PutUint16(l.msg[3:5], uint16(b.Amps*100))
+	l.checksum()
+}
+
 func (l *ltmbuf) gframe(b types.LogItem) {
 	lat := int32(b.Lat * 1.0e7)
 	lon := int32(b.Lon * 1.0e7)
@@ -330,6 +337,9 @@ func LTMGen(seg types.LogSegment, meta types.FlightMeta) {
 			l = newLTM('S')
 			l.sframe(b)
 			s.Write(l.msg)
+			l = newLTM('a') // provate current
+			l.paframe(b)
+			s.Write(l.msg)
 			g2t = b.Utc.Add(g2diff)
 		}