Added mutex and more doxygen

include/sta/drivers/w25qxx.hpp

@@ -2,6 +2,8 @@
 #define STA_SENSORS_W25Q128_HPP
 
 #include <sta/bus/spi/device.hpp>
+#include <sta/mutex.hpp>
+
 #include <sta/drivers/w25qxx_defs.hpp>
 
 #include <functional>
@@ -60,12 +62,14 @@ namespace sta
         using DelayUsFunc = void (*)(uint32_t);
 
         /**
-         * @brief Construct a new W25Qxx object
+         * @brief Driver class for the W25QXX flash storage series.
          * 
-         * @param device 
-         * @param addrMode 
+         * @param device A SPI device handle from sta-core.
+         * @param delay A microsecond delay function.
+         * @param addrMode Choose between 24 Bit and 32 Bit addressing.
+         * @param mutex A mutex for thread safety if the flash chip is used by multiple threads. Defaults to a always free mutex.
          */
-        W25Qxx(SPIDevice * device, DelayUsFunc delay, AddressMode addrMode = AddressMode::_24BIT);
+        W25Qxx(SPIDevice * device, DelayUsFunc delay, AddressMode addrMode = AddressMode::_24BIT, Mutex * mutex = Mutex::ALWAYS_FREE);
 
         /**
          * @brief Initialize the flash chip.
@@ -318,6 +322,7 @@ namespace sta
     private:
         SPIDevice * device_;
         DelayUsFunc delay_;
+        Mutex * mutex_;
         ChipState state_;
         AddressMode addrMode_;
     };