diff --git a/Source/main.c b/Source/main.c
new file mode 100644
--- /dev/null
+++ b/Source/main.c
@@ -0,0 +1,46 @@
+//
+// mBuoy Depth Select Firmware
+// Copyright 2015 SeaLandAire Technologies
+//
+
+#include "config.h"
+#include "error.h"
+#include "system/gpio.h"
+#include "system/sysclk.h"
+#include "system/watchdog.h"
+#include "stm32f0xx_hal.h"
+#include "si446x/si446x.h"
+#include "aprs/aprs.h"
+#include "aprs/afsk.h"
+
+int main(void)
+{
+  hal_init();
+  sysclock_init();
+  gpio_init();
+
+  afsk_init();
+  si446x_init();
+  // Software timers
+  uint32_t last_led = HAL_GetTick();
+
+  while (1)
+  {
+	  // Blink LEDs
+	  if(HAL_GetTick() - last_led > 1500)
+	  {
+		  aprs_send();
+		  while(afsk_busy());
+
+		  last_led = HAL_GetTick();
+	  }
+
+	  if(afsk_request_cwoff())
+		  si446x_cw_off();
+
+	  // High-frequency function calls
+//	  gpio_process_shutdown();
+//	  watchdog_feed();
+  }
+}
+