Fix race conditions on SPI and integrate the SPI NOR Flash driver into DFUService (WIP)

src/drivers/SpiNorFlash.h

@@ -12,6 +12,26 @@ namespace Pinetime {
         SpiNorFlash(SpiNorFlash&&) = delete;
         SpiNorFlash& operator=(SpiNorFlash&&) = delete;
 
+        typedef struct __attribute__((packed)) {
+          uint8_t manufacturer = 0;
+          uint8_t type = 0;
+          uint8_t density = 0;
+        } Identification;
+
+        Identification ReadIdentificaion();
+        uint8_t ReadStatusRegister();
+        bool WriteInProgress();
+        bool WriteEnabled();
+        uint8_t ReadConfigurationRegister();
+        void Read(uint32_t address, uint8_t* buffer, size_t size);
+        void Write(uint32_t address, uint8_t *buffer, size_t size);
+        void WriteEnable();
+        void SectorErase(uint32_t sectorAddress);
+        uint8_t ReadSecurityRegister();
+        bool ProgramFailed();
+        bool EraseFailed();
+
+
         void Init();
         void Uninit();
 
@@ -19,6 +39,18 @@ namespace Pinetime {
         void Sleep();
         void Wakeup();
       private:
+        enum class Commands : uint8_t {
+            PageProgram = 0x02,
+            Read = 0x03,
+            ReadStatusRegister = 0x05,
+            WriteEnable = 0x06,
+            ReadConfigurationRegister = 0x15,
+            SectorErase = 0x20,
+            ReadSecurityRegister = 0x2B,
+            ReadIdentification = 0x9F,
+        };
+        static constexpr uint16_t pageSize = 256;
+
         Spi& spi;
 
     };