Hack in support for other boards/microcontrollers, add GpioDriver

There's definitely plenty of cleanup work to be done (see:
"ifdefs").

firmware/Bsp/Drivers/SpiDriver.h

@@ -23,17 +23,19 @@
 
 #include "Bsp/ReturnCode.h"
 #include "Bsp/TaskScheduler.h"
+#include "Bsp/Drivers/GpioDriver.h"
 
-// TODO: Find a better include for this
-#include "stm32l0xx.h"
+#include "Mcu.h"
 
 namespace BSP {
 
 class SpiDriver : public BSP::Schedule::Task {
 
 public:
-    // TODO: Add configurability / provide a real abstraction
-    SpiDriver(BSP::Schedule::TaskScheduler &scheduler);
+    // TODO: Allow other CS pins of either polaritu
+    // TODO: Allow configurable CPHA, CPOL
+    // TODO: Allow other SPI instances (not just SPI1)
+    SpiDriver(BSP::Schedule::TaskScheduler &scheduler, BSP::GpioPin &nss);
 
     void init();
     BSP::Schedule::NextTime execute() override;
@@ -42,6 +44,7 @@ public:
 private:
     BSP::Schedule::TaskScheduler &m_scheduler;
     SPI_TypeDef *m_spi;
+    BSP::GpioPin &m_nss;
 };
 
 }