Boot stub: periodic heap status and key logging on serial

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EhqxQ49eCju4CzKYNjZzwT

src/main.cpp

@@ -19,11 +19,21 @@ void setup() {
     d.drawString("Press keys...", 8, 56);
 
     Serial.begin(115200);
-    Serial.printf("%s %s, free heap %u, psram %u\n", roro::kProductName,
-                  roro::versionString(), ESP.getFreeHeap(), ESP.getPsramSize());
+}
+
+static void printStatus() {
+    Serial.printf("%s %s, free heap %u, min free heap %u, psram %u\n", roro::kProductName,
+                  roro::versionString(), ESP.getFreeHeap(), ESP.getMinFreeHeap(),
+                  ESP.getPsramSize());
 }
 
 void loop() {
+    static uint32_t lastStatus = 0;
+    if (millis() - lastStatus > 3000) {
+        lastStatus = millis();
+        printStatus();
+    }
+
     M5Cardputer.update();
     if (M5Cardputer.Keyboard.isChange() && M5Cardputer.Keyboard.isPressed()) {
         auto state = M5Cardputer.Keyboard.keysState();
@@ -32,5 +42,8 @@ void loop() {
         auto& d = M5Cardputer.Display;
         d.fillRect(0, 80, d.width(), 20, TFT_BLACK);
         d.drawString("key: " + s, 8, 80);
+        Serial.printf("keys: word='%s' fn=%d opt=%d ctrl=%d alt=%d shift=%d enter=%d del=%d tab=%d\n",
+                      s.c_str(), state.fn, state.opt, state.ctrl, state.alt, state.shift,
+                      state.enter, state.del, state.tab);
     }
 }