Add TX power adjustment

README.md

@@ -158,6 +158,8 @@ not available.
   You can transmit your own voice using a mic attached to your computer for
   example.
 - `t`: toggles the tune process
+- `+`: increase TX power
+- `-`: decrease TX power
 
 ## Authors
 

civcontrol.go

@@ -11,8 +11,9 @@ type civControlStruct struct {
 	st *serialStream
 
 	state struct {
-		ptt  bool
-		tune bool
+		ptt        bool
+		tune       bool
+		pwrPercent int
 	}
 }
 
@@ -129,9 +130,9 @@ func (s *civControlStruct) decodePower(d []byte) {
 	}
 
 	hex := uint16(d[1])<<8 | uint16(d[2])
-	percent := int(math.Round((float64(hex) / 0x0255) * 100))
+	s.state.pwrPercent = int(math.Round((float64(hex) / 0x0255) * 100))
 
-	statusLog.reportTxPower(percent)
+	statusLog.reportTxPower(s.state.pwrPercent)
 }
 
 func (s *civControlStruct) decodeTransmitStatus(d []byte) {
@@ -161,6 +162,27 @@ func (s *civControlStruct) decodeTransmitStatus(d []byte) {
 	statusLog.reportPTT(s.state.ptt, s.state.tune)
 }
 
+func (s *civControlStruct) setPwr(percent int) error {
+	v := uint16(0x0255 * (float64(percent) / 100))
+	return s.st.send([]byte{254, 254, civAddress, 224, 0x14, 0x0a, byte(v >> 8), byte(v & 0xff), 253})
+}
+
+func (s *civControlStruct) incPwr() error {
+	if s.state.pwrPercent < 100 {
+		s.state.pwrPercent++
+		return s.setPwr(s.state.pwrPercent)
+	}
+	return nil
+}
+
+func (s *civControlStruct) decPwr() error {
+	if s.state.pwrPercent > 0 {
+		s.state.pwrPercent--
+		return s.setPwr(s.state.pwrPercent)
+	}
+	return nil
+}
+
 func (s *civControlStruct) setPTT(enable bool) error {
 	var b byte
 	if enable {

keyboard-linux.go

@@ -24,6 +24,18 @@ func (s *keyboardStruct) handleKey(k byte) {
 				log.Error("can't toggle tune: ", err)
 			}
 		}
+	case '+':
+		if civControl != nil {
+			if err := civControl.incPwr(); err != nil {
+				log.Error("can't increase power: ", err)
+			}
+		}
+	case '-':
+		if civControl != nil {
+			if err := civControl.decPwr(); err != nil {
+				log.Error("can't decrease power: ", err)
+			}
+		}
 	}
 }