Added command to set input gain level

Signed-off-by: jamie robertson <jamie@robertsonics.com>

Author: robertsonics

README.md

@@ -89,6 +89,10 @@ Tsunami tsunami;
   audio is playing, you will hear the result immediately. If audio is not playing,
   the new gain will be used the next time a track is started.
 
+**tsunami.inputGain(int gain)** - this function immediately sets the gain of the
+  stereo input to the specified value. The range for gain is -70 to +4. If audio
+  audio is playing, you will hear the result immediately.
+
 **tsunami.samplerateOffset(int out, int offset)** - this function immediately sets sample-rate offset,
   or playback speed / pitch, of the specified stereo output. The range for
   for the offset is -32767 to +32676, giving a speed range of 1/2x to 2x, or a

Tsunami.cpp

@@ -193,6 +193,23 @@ uint8_t o;
 	TsunamiSerial.write(txbuf, 8);
 }
 
+// **************************************************************
+void Tsunami::inputGain(int gain) {
+
+	uint8_t txbuf[8];
+	unsigned short vol;
+
+	txbuf[0] = SOM1;
+	txbuf[1] = SOM2;
+	txbuf[2] = 0x07;
+	txbuf[3] = CMD_MASTER_VOLUME;
+	vol = (unsigned short)gain;
+	txbuf[4] = (uint8_t)vol;
+	txbuf[5] = (uint8_t)(vol >> 8);
+	txbuf[6] = EOM;
+	TsunamiSerial.write(txbuf, 7);
+}
+
 // **************************************************************
 void Tsunami::setReporting(bool enable) {
 

Tsunami.h

@@ -36,6 +36,7 @@
 #define CMD_SET_TRIGGER_BANK		14
 #define CMD_SET_INPUT_MIX			15
 #define CMD_SET_MIDI_BANK			16
+#define CMD_INPUT_GAIN				18
 
 #define TRK_PLAY_SOLO				0
 #define TRK_PLAY_POLY				1
@@ -99,6 +100,7 @@ class Tsunami
 	int getNumTracks(void);
 	bool isTrackPlaying(int trk);
 	void masterGain(int out, int gain);
+	void inputGain(int gain);
 	void stopAllTracks(void);
 	void resumeAllInSync(void);
 	void trackPlaySolo(int trk, int out, bool lock);