Convert Spi and GFX to C++.

src/drivers/SpiMaster.h

@@ -0,0 +1,32 @@
+#pragma once
+#include <cstdint>
+#include <cstddef>
+#include <array>
+
+namespace Pinetime {
+  namespace Drivers {
+    class SpiMaster {
+      public:;
+        enum class SpiModule : uint8_t {SPI0, SPI1};
+        enum class BitOrder : uint8_t {Msb_Lsb, Lsb_Msb};
+        enum class Modes : uint8_t {Mode0, Mode1, Mode2, Mode3};
+        enum class Frequencies : uint8_t {Freq8Mhz};
+        struct Parameters {
+          BitOrder bitOrder;
+          Modes mode;
+          Frequencies Frequency;
+          uint8_t pinSCK;
+          uint8_t pinMOSI;
+          uint8_t pinMISO;
+          uint8_t pinCSN;
+        };
+        bool Init(const SpiModule spi, const Parameters& params);
+
+        bool Write(const uint8_t* data, size_t size);
+
+      private:
+        NRF_SPI_Type *  spiBaseAddress;
+        uint8_t pinCsn;
+    };
+  }
+}