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+# Interfaces
+
+The intention of these interfaces is to provide an abstraction layer for commonly used
+resources. Libraries using these interfaces can be reused on different platforms
+by simply implementing the required interfaces for the selected platform.
+
+Interfaces for the following resources are provided:
+* GPIO pin
+* Mutex
+* Signal
+* SPI
+* UART
+
+
+# HAL implementations
+
+Implementations using the HAL are provided for the following interfaces:
+* GpioPin
+* SpiInterface, SpiDevice
+* UART
+
+
+# Atomic implementations
+
+Implementations using atomic variables are provided for the following interfaces:
+* Mutex
+* Signal
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