From a3f5922478a8d8990df5573dd9bc55ad9f60edd4 Mon Sep 17 00:00:00 2001
From: unicod <yvtr@protonmail.com>
Date: Fri, 21 Oct 2022 22:01:08 +0200
Subject: [PATCH] Air Fader (volume) handling

* LED + INC/DEC button handling
---
 XAirMixerControl.ino | 49 ++++++++++++++++++++++-----
 ui.cpp               | 12 +++++++
 ui.h                 | 81 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 134 insertions(+), 8 deletions(-)

diff --git a/XAirMixerControl.ino b/XAirMixerControl.ino
index aa46430..3429eac 100644
--- a/XAirMixerControl.ino
+++ b/XAirMixerControl.ino
@@ -38,30 +38,46 @@ Tmr Tmr1s    = { .Period = 1000 };
 * @brief Button - port assignment
 *******************************************************************************/
 const uint8_t pinBtnChOn1  = 2;
-const uint8_t pinBtnChOn2  = 3;
+const uint8_t pinLedChOn1  = 3;
 
-const uint8_t pinBtnInc1   = 8;
-const uint8_t pinBtnDec1   = 9;
-const uint8_t pinBtnInc2   = 10;
-const uint8_t pinBtnDec2   = 11;
+const uint8_t pinBtnChOn2  = 4;
+const uint8_t pinLedChOn2  = 5;
+
+const uint8_t pinBtnInc1   = 6;
+const uint8_t pinLedInc1   = 7;
+const uint8_t pinBtnDec1   = 8;
+const uint8_t pinLedDec1   = 9;
+
+const uint8_t pinBtnInc2   = A0;
+const uint8_t pinLedInc2   = A1;
+const uint8_t pinBtnDec2   = A2;
+const uint8_t pinLedDec2   = A3;
 
 /***************************************************************************//**
 * @brief LED
 *******************************************************************************/
 TimedPin LedBoard(LED_BUILTIN);
-TimedPin LedChOn1(A0, true);
-TimedPin LedChOn2(A1, true);
+TimedPin LedChOn1(pinLedChOn1, true);
+TimedPin LedChOn2(pinLedChOn2, true);
+TimedPin LedInc1(pinLedInc1, true);
+TimedPin LedDec1(pinLedDec1, true);
+TimedPin LedInc2(pinLedInc2, true);
+TimedPin LedDec2(pinLedDec2, true);
 
 
 
 bool MidiCfgTxOnly;     /// duplex or only tx configuration (without MIDI rx line)
 
 MixerMuteState AirMutes[2] = {
-   //MixerMuteState(23, &LedBoard),
    MixerMuteState(21, &LedChOn1, BTN_CH_ON1, EV_UI_RX_MUTE_CH1_ON, EV_UI_RX_MUTE_CH1_OFF),
    MixerMuteState(22, &LedChOn2, BTN_CH_ON2, EV_UI_RX_MUTE_CH2_ON, EV_UI_RX_MUTE_CH2_OFF)
 };
 
+MixerFaderState AirFaders[2] = {
+   MixerFaderState(0, 90, 100, 110, &LedInc1, &LedDec1, BTN_INC1, BTN_DEC1),
+   MixerFaderState(1, 90, 100, 110, &LedInc2, &LedDec2, BTN_INC2, BTN_DEC2)
+};
+
 /***************************************************************************//**
 * @brief MIDI instance (serial port)
 *******************************************************************************/
@@ -69,6 +85,15 @@ MIDI_CREATE_DEFAULT_INSTANCE();
 
 // -----------------------------------------------------------------------------
 void MidiCCHandler(byte channel, byte ctrl_no, byte val) {
+   if (channel == 1) {     // Faders: ch=1
+      for (uint_fast8_t i=0; i<ELEMCNT(AirFaders); i++) {
+         MixerFaderState& fader = AirFaders[i];
+         if (ctrl_no == fader.MidiCtrlNr) {
+            fader.VolumeReceived(val);
+         }
+      }
+   }
+
    if (channel == 2) {     // Mutes: ch=2
       for (uint_fast8_t i=0; i<ELEMCNT(AirMutes); i++) {
          MixerMuteState& mute = AirMutes[i];
@@ -97,6 +122,10 @@ void setup() {
    LedBoard.begin();
    LedChOn1.begin();
    LedChOn2.begin();
+   LedInc1.begin();
+   LedDec1.begin();
+   LedInc2.begin();
+   LedDec2.begin();
 
    MIDI.setHandleControlChange(MidiCCHandler);
    MIDI.begin(MIDI_CHANNEL_OMNI);         // Initiate MIDI communications, listen to all channels
@@ -154,6 +183,10 @@ void loop() {
       LedBoard.loop();
       LedChOn1.loop();
       LedChOn2.loop();
+      LedInc1.loop();
+      LedDec1.loop();
+      LedInc2.loop();
+      LedDec2.loop();
    }
    // execute every 100ms ******************************************************
    if (Tmr100ms.Check(t)) { 
diff --git a/ui.cpp b/ui.cpp
index 8b42ffa..3428276 100644
--- a/ui.cpp
+++ b/ui.cpp
@@ -27,6 +27,7 @@ extern MIDI_NAMESPACE::SerialMIDI<HardwareSerial> serialMIDI;
 extern MIDI_NAMESPACE::MidiInterface<MIDI_NAMESPACE::SerialMIDI<HardwareSerial>> MIDI;
 
 extern MixerMuteState AirMutes[2];
+extern MixerFaderState AirFaders[2];
 
 
 // Typedefs ====================================================================
@@ -173,6 +174,17 @@ void UiSt_Home(UI_SM* const me, uint16_t event) {
                MIDI.sendControlChange(mute.MidiCtrlNr, mute.MuteLocal ? 0 : 127, 2);
             }
          }
+         for (uint_fast8_t i=0; i<ELEMCNT(AirFaders); i++) {
+            MixerFaderState& fader = AirFaders[i];
+            if (btn == fader.UiButtonInc) {
+               fader.VolumeInc();
+               MIDI.sendControlChange(fader.MidiCtrlNr, fader.FaderLocal, 1);
+            }
+            if (btn == fader.UiButtonDec) {
+               fader.VolumeDec();
+               MIDI.sendControlChange(fader.MidiCtrlNr, fader.FaderLocal, 1);
+            }
+         }
       }break;
 
       case EV_UI_TICK_10MS: {
diff --git a/ui.h b/ui.h
index 333efe8..1be61f4 100644
--- a/ui.h
+++ b/ui.h
@@ -36,6 +36,10 @@ enum UI_EVENTS {
    EV_UI_RX_MUTE_CH1_OFF,
    EV_UI_RX_MUTE_CH2_ON,
    EV_UI_RX_MUTE_CH2_OFF,
+   EV_UI_RX_FADER_INC1,
+   EV_UI_RX_FADER_DEC1,
+   EV_UI_RX_FADER_INC2,
+   EV_UI_RX_FADER_DEC2,
 
    EV_UI_KEY_PRESS     = 0x0100,
    EV_UI_KEY_PRESS_MAX = 0x01FF,
@@ -61,6 +65,83 @@ struct MixerMuteState {
       MuteMixer(false), MuteLocal(false), MidiCtrlNr(ctrl_nr), UiButton(button), UiEventOn(uieventon), UiEventOff(uieventoff), Led(led) { }
 };
 
+/***************************************************************************//**
+* @brief Unit for fader from Air mixer
+*******************************************************************************/
+struct MixerFaderState {
+   uint8_t MidiCtrlNr;     /// assign MIDI CC number to MUTE switch of Air mixer
+   uint8_t FaderMixer;     /// volume received from mixer
+   uint8_t FaderLocal;     /// local volume (sent to mixer)
+   uint8_t FaderMin;       /// min volume
+   uint8_t FaderMax;       /// max volume
+   uint8_t FaderStd;       /// std volume
+   BTN_CODES UiButtonInc;  /// assigned button
+   BTN_CODES UiButtonDec;  /// assigned button
+   TimedPin* LedInc;
+   TimedPin* LedDec;
+   
+   MixerFaderState(
+      uint8_t ctrl_nr,
+      uint8_t volmin,
+      uint8_t volstd,
+      uint8_t volmax,
+      TimedPin* ledinc,
+      TimedPin* leddec,
+      BTN_CODES btninc,
+      BTN_CODES btndec
+   ) :
+      MidiCtrlNr(ctrl_nr),
+      FaderMixer(0),
+      FaderLocal(0),
+      FaderMin(volmin),
+      FaderStd(volstd),
+      FaderMax(volmax),
+      UiButtonInc(btninc),
+      UiButtonDec(btndec),
+      LedInc(ledinc),
+      LedDec(leddec)
+   { }
+   void LedUpdateVolSent() {
+      uint16_t t_on = 50;
+      uint16_t t_off = 950;
+      if (FaderLocal > FaderStd) {
+         t_on = 950;
+         t_off = 50;
+      }
+      LedInc->Blink(t_on, t_off);
+
+      t_on = 950;
+      t_off = 50;
+      if (FaderLocal < FaderStd) {
+         t_on = 950;
+         t_off = 50;
+      }
+      LedDec->Blink(t_on, t_off);
+   }
+   void VolumeReceived(uint8_t vol) {
+      FaderMixer = vol;
+      FaderLocal = vol;
+      LedInc->Set((vol > FaderStd));
+      LedDec->Set((vol < FaderStd));
+   }
+   bool VolumeInc() {
+      if (FaderLocal < FaderMax) {
+         FaderLocal++;
+         LedUpdateVolSent();
+         return true;
+      }
+      return false;
+   }
+   bool VolumeDec() {
+      if (FaderLocal > FaderMin) {
+         FaderLocal--;
+         LedUpdateVolSent();
+         return true;
+      }
+      return false;
+   }
+};
+
 
 
 extern void UI_Init();