Add OLED support

purrChestrion-arduino/purrChestrion-arduino.ino

@@ -1,11 +1,30 @@
+#define FW_VER 1.0
+#define USE_OLED true // LEDC68 (Gotek alphanumeric displays)
+#define USE_ENCODER false
 
 // include libraries
 #include <Adafruit_MCP23X17.h>
 #include <MIDI.h>
 
+#if USE_OLED
+  #include <Wire.h>
+  #include <Adafruit_GFX.h>
+  #include <Adafruit_SSD1306.h>
+  #include "font.h"
+  #include "gfx.h"
+  #define SCREEN_WIDTH 128
+  #define SCREEN_HEIGHT 32
+  Adafruit_SSD1306 oled(SCREEN_WIDTH,SCREEN_HEIGHT,&Wire,-1);
+#endif
+
+#if USE_ENCODER
+
+#endif
+
 // Instantiate libraries
 Adafruit_MCP23X17 mcp1; // First MCP23017
 Adafruit_MCP23X17 mcp2; // Second MCP23017
+
 // Default hardware MIDI. SoftwareSerial is too slow...
 MIDI_CREATE_DEFAULT_INSTANCE();
 //                        A7 A6 A5 A4 A3 A2 A1 A0  <-- GPIO A
@@ -17,7 +36,7 @@ MIDI_CREATE_DEFAULT_INSTANCE();
 //                        B0 B1 B2 B3 B4 B5 B6 B7  <-- GPIO B
 
 // Default MIDI channel
-byte currentMidiChannel = 8; // Default MIDI channel
+byte currentMidiChannel = MIDI_CHANNEL_OMNI; //8; // Default MIDI channel
 
 // Struct for 2 MCP chips. 
 struct MCPOutput {
@@ -71,15 +90,46 @@ MCPOutput noteToMCP[32] = {
 };
 
 
+void updateOLED() {
+#if USE_OLED
+    oled.clearDisplay();
+    oled.drawBitmap(0, 0, midich, MIDICH_WIDTH, MIDICH_HEIGHT, 1);
+    oled.setCursor(88, 18);
+    oled.setTextColor(SSD1306_WHITE);
+    oled.setTextSize(1);
+  if (currentMidiChannel == MIDI_CHANNEL_OMNI) {
+    oled.print("ALL");
+  } else {
+    oled.print(currentMidiChannel);
+  }
+  oled.display();
+#endif
+}
+
 void setup() {
-  // LED debug
+  #if USE_OLED
+    if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // I2C addr 0x3C
+      // Don't halt if missing, just skip display
+    } else {
+      oled.clearDisplay();
+      oled.drawBitmap(0, 0, bootuplogo, BOOTLOGO_WIDTH, BOOTLOGO_HEIGHT, 1);
+      oled.setCursor(62, 18);
+      oled.setTextColor(SSD1306_WHITE);
+      oled.print("FW ver. " + String(FW_VER));
+      oled.display();
+      delay(2500);
+      oled.setFont(&UiFont);
+    }
+  #endif
+
+  // Midi Activity LED on Pin 13 (aka LED_BUILTIN)
   pinMode(LED_BUILTIN, OUTPUT);
 
   // Initialize MCP23017s
   mcp1.begin_I2C(0x20);
   mcp2.begin_I2C(0x21);
   // Initialize MIDI
-  MIDI.begin(MIDI_CHANNEL_OMNI);
+  MIDI.begin(currentMidiChannel);
   MIDI.setHandleNoteOn(handleNoteOn);
   MIDI.setHandleNoteOff(handleNoteOff);
 
@@ -90,6 +140,7 @@ void setup() {
     mcp2.pinMode(i, OUTPUT);
     mcp2.digitalWrite(i, LOW);
   }
+  updateOLED();
 }
 
 void loop() {
@@ -100,16 +151,11 @@ void loop() {
     digitalWrite(LED_BUILTIN, LOW);
     ledActive = false;
   }
-  // if (MIDI.read()) {
-  //   digitalWrite(LED_BUILTIN, HIGH);
-  //   delay(50);
-  //   digitalWrite(LED_BUILTIN, LOW);
-  
-  // }
 }
 
+
 void handleNoteOn(byte channel, byte pitch, byte velocity) {
-  if (channel == currentMidiChannel) {
+  if (currentMidiChannel == MIDI_CHANNEL_OMNI || channel == currentMidiChannel) {
 
     if (pitch >= 57 && pitch <= 88) {
       MCPOutput out = noteToMCP[pitch - 57];
@@ -121,14 +167,14 @@ void handleNoteOn(byte channel, byte pitch, byte velocity) {
    }
   }
 
-  // Flash LED on any valid Note On
+  // Flash LED on Note On
   digitalWrite(LED_BUILTIN, HIGH);
   ledOnTime = millis();
   ledActive = true;
 }
 
 void handleNoteOff(byte channel, byte pitch, byte velocity) {
-  if (channel == currentMidiChannel) {
+  if (currentMidiChannel == MIDI_CHANNEL_OMNI || channel == currentMidiChannel) {
     if (pitch >= 57 && pitch <= 88) {
       MCPOutput out = noteToMCP[pitch - 57];
       if (out.chip == 0) {