Clean up test code

Separate/consolidate board initialization code, and a few functions
that are shared across tests. Update the Makefile accordingly.

Resolves #18

firmware/Test/Common/TestBoard.h

@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2020  Max Regan
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#pragma once
+
+#include "Bsp/LowPowerTaskScheduler.h"
+#include "Bsp/Drivers/GpioDriver.h"
+#include "Bsp/Drivers/UsartDriver.h"
+
+void board_init();
+
+extern BSP::Schedule::LowPowerTaskScheduler<10> g_sched;
+extern BSP::GpioDriver g_gpioa;
+extern BSP::UsartDriver g_test_uart;