Some optimizations.

MIDI-Host-Adapter.ino

@@ -45,7 +45,6 @@ bool high_freq = false;
 TM1638plus_Model2 tm(STROBE_TM, CLOCK_TM, DIO_TM, swap_nibbles, high_freq);
 elapsedMillis button_debounce_timer;
 elapsedMillis blink_timer;
-elapsedMillis double_press_timer;
 uint8_t actual_channel;
 uint8_t new_channel;
 
@@ -89,31 +88,33 @@ void loop() {
 
   button = tm.ReadKey16();
 
-  if (button > 0 && button_debounce_timer > BUTTON_DEBOUNCE_TIME_MS && double_press_timer > BUTTON_DOUBLE_PRESS_MS) {
-    // Button pressed once
-    Serial.print("Button once: ");
-    Serial.println(button, DEC);
-    button_debounce_timer = 0;
-    double_press_timer = 0;
-    blink_timer = 0;
-    new_channel = button;
-    tm.DisplayDecNumNibble(new_channel, actual_channel, 0, false, TMAlignTextRight);
-  } else if (button > 0 && button_debounce_timer > BUTTON_DEBOUNCE_TIME_MS && double_press_timer < BUTTON_DOUBLE_PRESS_MS && button == new_channel) {
-    // Button pressed twice
-    Serial.print("Button twice: ");
-    Serial.println(button, DEC);
-    actual_channel = new_channel;
-    EEPROM.update(EEPROM_ADDRESS, 0xf0 | actual_channel);
-    SetMidiChannel(actual_channel);
-  } else if (actual_channel != new_channel) {
+  if (button > 0 && button != actual_channel && button_debounce_timer > BUTTON_DEBOUNCE_TIME_MS) {
+    if (button != new_channel) {
+      // Button pressed once
+      Serial.print("Button once: ");
+      Serial.println(button, DEC);
+      button_debounce_timer = 0;
+      blink_timer = 0;
+      new_channel = button;
+      tm.DisplayDecNumNibble(new_channel, actual_channel, 0, false, TMAlignTextRight);
+    } else {
+      // Button pressed twice
+      Serial.print("Button twice: ");
+      Serial.println(button, DEC);
+      actual_channel = new_channel;
+      EEPROM.update(EEPROM_ADDRESS, 0xf0 | actual_channel);
+      SetMidiChannel(actual_channel);
+    }
+  }
+
+  if (actual_channel != new_channel) {
     if (blink_timer > BLINK_FREQUENCY_MS) {
       blink_timer = 0;
       tm.DisplayDecNum(actual_channel, 0, false, TMAlignTextRight);
     } else if (blink_timer > BLINK_FREQUENCY_MS / 2) {
       tm.DisplayDecNumNibble(new_channel, actual_channel, 0, false, TMAlignTextRight);
     }
-  } else
-    tm.DisplayDecNum(actual_channel, 0, false, TMAlignTextRight);
+  } else tm.DisplayDecNum(actual_channel, 0, false, TMAlignTextRight);
 }
 
 void SetMidiChannel(uint8_t channel) {