Intermediary commit. Nothing's working, everything is broken. Let's start over now...

src/main.cpp

@@ -1,16 +1,52 @@
 #include <Arduino.h>
+#include <SPI.h>
 #include "config.h"
 #include "buttons.h"
 #include "controller.h"
 #include "player.h"
+#include "sd_card.h"
+#include "spi_master.h"
 
 Buttons* buttons;
 Controller* controller;
 Player* player;
+SDCard* sd;
+
+void printDirectory(File dir, int numTabs) {
+  while (true) {
+
+    File entry =  dir.openNextFile();
+    if (! entry) {
+      // no more files
+      break;
+    }
+    for (uint8_t i = 0; i < numTabs; i++) {
+      Serial.print('\t');
+    }
+    Serial.print(entry.name());
+    if (entry.isDirectory()) {
+      Serial.println("/");
+      printDirectory(entry, numTabs + 1);
+    } else {
+      // files have sizes, directories do not
+      Serial.print("\t\t");
+      Serial.println(entry.size(), DEC);
+    }
+    entry.close();
+  }
+}
 
 void setup() {
-	player = new Player();
-	controller = new Controller(player);
+	Serial.begin(74880);
+	Serial.println("Starting.");
+
+	Serial.println("Setting up SPI...");
+	SPI.begin();
+	SPIMaster::init();
+
+	sd = new SDCard();
+	player = new Player(sd);
+	controller = new Controller(player, sd);
 	buttons = new Buttons(controller);
 }