TEST: disable BLE init to isolate button press crash

src/app_task.cpp

@@ -37,9 +37,7 @@ void AppTask::begin() {
 
 void AppTask::update() {
     for (uint8_t i = 0; i < NUM_PADS; i++) {
-        Serial.printf("[APP DBG] reading switch %d\n", i);
         bool is_pressed = switch_driver->is_pressed(i);
-        Serial.printf("[APP DBG] switch %d = %d\n", i, is_pressed);
         
         if (is_pressed && !last_switch_state[i]) {
             Serial.printf("[APP] Switch %d pressed\n", i);
@@ -138,15 +136,14 @@ void AppTask::process_switch_event(uint8_t switch_id, bool pressed) {
             uint8_t cc_num = cc_map[i];
             uint8_t value = pressed ? 127 : 0;
             
-            // DEBUG: just print, don't send anything
-            Serial.printf("[APP DEBUG] Switch %d pressed, would send Ch%d CC%d Val%d\n",
-                          switch_id, channel, cc_num, value);
-            
             if (pressed) {
-                Serial.println("[APP DEBUG] would send USB MIDI");
+                usb_midi->send_cc(channel, cc_num, value);
-                Serial.println("[APP DEBUG] would send BLE MIDI");
+                if (ble_midi) ble_midi->send_cc(channel, cc_num, value);
             }
             
+            Serial.printf("[APP] Switch %d -> Ch%d CC%d Val%d (%s)\n",
+                          switch_id, channel, cc_num, value,
+                          pressed ? "PRESS" : "RELEASE");
             break;
         }
     }

src/ble_midi_transport.cpp

@@ -111,20 +111,7 @@ void BleMidiTransport::on_midi_receive(std::function<void(const MidiEvent&)> cal
 }
 
 void BleMidiTransport::send_midi_packet(const uint8_t* data, uint8_t len) {
-    if (!initialized) {
+    if (!initialized || !client_connected || !ble_char) return;
-        Serial.println("[BLE DBG] send_midi_packet: not initialized");
-        return;
-    }
-    if (!client_connected) {
-        Serial.println("[BLE DBG] send_midi_packet: no client");
-        return;
-    }
-    if (!ble_char) {
-        Serial.println("[BLE DBG] send_midi_packet: null char");
-        return;
-    }
-
-    Serial.println("[BLE DBG] send_midi_packet: proceeding to send");
 
     uint16_t timestamp = micros() & 0x3FFF;
     uint8_t packet[16];
@@ -135,11 +122,8 @@ void BleMidiTransport::send_midi_packet(const uint8_t* data, uint8_t len) {
         packet[idx++] = data[i];
     }
 
-    Serial.println("[BLE DBG] calling setValue...");
     ble_char->setValue(packet, idx);
-    Serial.println("[BLE DBG] calling notify...");
     ble_char->notify();
-    Serial.println("[BLE DBG] notify done");
 }
 
 void BleMidiTransport::send_note_on(uint8_t channel, uint8_t note, uint8_t velocity) {
@@ -155,11 +139,8 @@ void BleMidiTransport::send_note_off(uint8_t channel, uint8_t note, uint8_t velo
 }
 
 void BleMidiTransport::send_cc(uint8_t channel, uint8_t cc, uint8_t value) {
-    Serial.printf("[BLE DBG] send_cc entered: ch=%d cc=%d val=%d init=%d conn=%d char=%p\n",
-                  channel, cc, value, initialized, client_connected, ble_char);
     uint8_t packet[3] = {(uint8_t)(0xB0 | (channel - 1)), cc, value};
     send_midi_packet(packet, 3);
-    Serial.printf("[BLE OUT] Ch:%d CC:%d:%d\n", channel, cc, value);
 }
 
 bool BleMidiTransport::is_connected() {

src/main.cpp

@@ -346,14 +346,15 @@ void setup() {
     switch_driver.set_mux(&mux);
     switch_driver.begin();
     
+    // BLE disabled for crash diagnosis
+    // Serial.println("[INIT] Initializing BLE MIDI...");
+    // delay(1000);
+    // ble_midi_transport.begin();
+
     Serial.println("[INIT] Initializing USB MIDI...");
     midi_transport.begin();
     delay(500);
 
-    Serial.println("[INIT] Initializing BLE MIDI...");
-    delay(1000);
-    ble_midi_transport.begin();
-
     Serial.println("[INIT] Registering MIDI callbacks...");
     controller.begin();
     

src/midi_transport.cpp

@@ -91,18 +91,9 @@ void UsbMidiTransport::send_note_off(uint8_t channel, uint8_t note, uint8_t velo
 }
 
 void UsbMidiTransport::send_cc(uint8_t channel, uint8_t cc, uint8_t value) {
-    if (!initialized) {
+    if (!initialized) return;
-        Serial.println("[MIDI DBG] send_cc: not initialized");
-        return;
-    }
-    if (!TinyUSBDevice.ready()) {
-        Serial.println("[MIDI DBG] send_cc: USB not ready");
-        return;
-    }
-    Serial.println("[MIDI DBG] send_cc: calling writePacket...");
     uint8_t packet[4] = {0x0B, (uint8_t)(0xB0 | (channel - 1)), cc, value};
     usb_midi.writePacket(packet);
-    Serial.printf("[MIDI OUT] Ch:%d CC:%d:%d\n", channel, cc, value);
 }
 
 bool UsbMidiTransport::is_connected() {