fatal errors

firmware/src/debug.cpp

@@ -1,9 +1,11 @@
 #include <Arduino.h>
-#include "constants.h"
-
 #if DEBUG_I2C
 #include <I2CScanner.h>
+#endif
+#include "constants.h"
+#include "buzzer.h"
 
+#if DEBUG_I2C
 I2CScanner scanner;
 #endif
 
@@ -22,3 +24,19 @@ void debugScanI2C() {
   scanner.Scan();
 #endif
 }
+
+void fatal() {
+  Serial.println("Fatal error encountered. Sad trombone...");
+
+  while (true) {
+    sadBuzz();
+
+    digitalWrite(LED_BUILTIN, HIGH);
+    delay(500);
+    digitalWrite(LED_BUILTIN, LOW);
+    delay(500);
+    digitalWrite(LED_BUILTIN, HIGH);
+    delay(500);
+    digitalWrite(LED_BUILTIN, LOW);
+  }
+}

firmware/src/debug.h

@@ -2,3 +2,4 @@
 
 void setupDebug();
 void debugScanI2C();
+void fatal();

firmware/src/main.cpp

@@ -14,8 +14,9 @@ void setup() {
 
   Wire.begin();
 
-  setupScreen();
-  setupKeyboard();
+  if (!setupScreen() || !setupKeyboard()) {
+    fatal();
+  }
 
   helloBuzz();
 }