Add boot-time layout test (no serial input needed)

src/app_task.cpp

@@ -1,5 +1,7 @@
 #include "app_task.h"
 #include <Arduino.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
 
 AppTask::AppTask(LedStub* led, SwitchStub* sw, UsbMidiTransport* midi)
     : led_driver(led), switch_driver(sw), midi_transport(midi) {
@@ -23,9 +25,82 @@ void AppTask::begin() {
         process_midi_event(event);
     });
     
+    // Auto-run layout test on boot (no serial needed)
+    run_layout_test();
+    
     Serial.println("[APP] Controller ready");
 }
 
+void AppTask::run_layout_test() {
+    Serial.println("[APP] Running layout identification test...");
+    
+    // Test 1: Launchpad X (notes 36-45, ch1)
+    Serial.println("[APP] Layout 1: Launchpad X (notes 36-45, ch1)");
+    for (uint8_t i = 0; i < NUM_PADS; i++) {
+        MidiEvent event;
+        event.type = MidiEvent::NOTE_ON;
+        event.channel = 1;
+        event.data1 = 36 + i;
+        event.data2 = 64;
+        process_midi_event(event);
+        vTaskDelay(pdMS_TO_TICKS(1500));
+        event.type = MidiEvent::NOTE_OFF;
+        event.data2 = 0;
+        process_midi_event(event);
+        vTaskDelay(pdMS_TO_TICKS(300));
+    }
+    
+    // Test 2: Launchpad Mini (notes 0-9, ch1)
+    Serial.println("[APP] Layout 2: Launchpad Mini (notes 0-9, ch1)");
+    for (uint8_t i = 0; i < NUM_PADS; i++) {
+        MidiEvent event;
+        event.type = MidiEvent::NOTE_ON;
+        event.channel = 1;
+        event.data1 = i;
+        event.data2 = 64;
+        process_midi_event(event);
+        vTaskDelay(pdMS_TO_TICKS(1500));
+        event.type = MidiEvent::NOTE_OFF;
+        event.data2 = 0;
+        process_midi_event(event);
+        vTaskDelay(pdMS_TO_TICKS(300));
+    }
+    
+    // Test 3: Channel 2 (notes 36-45)
+    Serial.println("[APP] Layout 3: Channel 2 flashing (notes 36-45, ch2)");
+    for (uint8_t i = 0; i < NUM_PADS; i++) {
+        MidiEvent event;
+        event.type = MidiEvent::NOTE_ON;
+        event.channel = 2;
+        event.data1 = 36 + i;
+        event.data2 = 64;
+        process_midi_event(event);
+        vTaskDelay(pdMS_TO_TICKS(1500));
+        event.type = MidiEvent::NOTE_OFF;
+        event.data2 = 0;
+        process_midi_event(event);
+        vTaskDelay(pdMS_TO_TICKS(300));
+    }
+    
+    // Test 4: Channel 3 (notes 36-45)
+    Serial.println("[APP] Layout 4: Channel 3 pulsing (notes 36-45, ch3)");
+    for (uint8_t i = 0; i < NUM_PADS; i++) {
+        MidiEvent event;
+        event.type = MidiEvent::NOTE_ON;
+        event.channel = 3;
+        event.data1 = 36 + i;
+        event.data2 = 64;
+        process_midi_event(event);
+        vTaskDelay(pdMS_TO_TICKS(1500));
+        event.type = MidiEvent::NOTE_OFF;
+        event.data2 = 0;
+        process_midi_event(event);
+        vTaskDelay(pdMS_TO_TICKS(300));
+    }
+    
+    Serial.println("[APP] Layout test complete - observe which lit your pads");
+}
+
 void AppTask::update() {
     for (uint8_t i = 0; i < NUM_PADS; i++) {
         bool is_pressed = switch_driver->is_pressed(i);