Added I2C support for raspi & first rework of debugging

include/sta/bus/i2c/device.hpp

@@ -0,0 +1,37 @@
+#ifndef STA_CORE_I2C_DEVICE_HPP
+#define STA_CORE_I2C_DEVICE_HPP
+
+#include <sta/bus/i2c/i2c.hpp>
+#include <sta/bus/device.hpp>
+
+namespace sta
+{
+    /**
+     * @brief Peripheral device connected via I2c.
+     *
+     * @ingroup sta_core_i2c
+     */
+    class I2cDevice : public Device
+    {
+    public:
+        /**
+         * @param intf      %I2C hardware interface
+         * @param csPin     The peripheral's address.
+         */
+        I2cDevice(I2c * intf, int addr);
+
+    protected:
+        void select() override;
+
+        void deselect() override;
+        
+    private:
+        int addr_; /**< device address */
+    };
+    
+} // namespace sta
+
+
+
+
+#endif // STA_CORE_I2C_DEVICE_HPP

include/sta/bus/i2c/i2c.hpp

@@ -0,0 +1,33 @@
+#ifndef STA_CORE_I2C_I2C_HPP
+#define STA_CORE_I2C_I2C_HPP
+
+#include <sta/bus/interface.hpp>
+#include <sta/mutex.hpp>
+
+#include <cstddef>
+#include <cstdint>
+
+namespace sta
+{
+    /**
+     * @brief Interface class for %I2C hardware.
+     *
+     * Represents a single %I2C bus that can be shared by multiple devices.
+     *
+     * @ingroup sta_core_i2c
+     */
+    class I2c : public Interface
+    {
+    public:
+        I2c(Mutex * mutex=nullptr);
+
+        /**
+         * @brief Address selection for the I2C bus.
+         * 
+         * @param address The address to select.
+         */
+        virtual void selectAddress(uint16_t address) = 0;
+    };
+} // namespace sta
+
+#endif // STA_CORE_I2C_I2C_HPP