Update such that tests pass for v1.2

This includes minor updates for the th different MCU variant, and bugfixes.

Resolves #7

firmware/Test/fail.cpp

@@ -33,16 +33,22 @@
 using BSP::Time;
 
 static BSP::Schedule::LowPowerTaskScheduler<1> g_sched;
+static BSP::GpioDriver g_gpioa(GPIOA);
 #if defined(BOARD_WATCH)
 static BSP::UsartDriver g_test_uart(USART2, g_sched);
+static BSP::GpioPin g_tx_pin(g_gpioa, 9);
 #elif defined(BOARD_DEVBOARD)
 static BSP::UsartDriver g_test_uart(USART1, g_sched);
 #endif
-static BSP::GpioDriver g_gpioa(GPIOA);
 
 [[noreturn]] void main() {
 
     g_gpioa.enable();
+
+#if defined(BOARD_WATCH)
+    g_tx_pin.configure_alternate_function(4);
+#endif
+
     g_test_uart.init();
 
     g_test_uart.tx_blocking(test_start_text);