diff --git a/include/sta/uart.hpp b/include/sta/uart.hpp
new file mode 100644
index 0000000..42068fc
--- /dev/null
+++ b/include/sta/uart.hpp
@@ -0,0 +1,183 @@
+#ifndef STA_UART_HPP
+#define STA_UART_HPP
+
+#include <stddef.h>
+#include <stdint.h>
+
+
+namespace sta
+{
+	/**
+	 * @brief Integer representation.
+	 */
+	enum class IntegerBase
+	{
+		DEC,    /**< Decimal */
+		BIN,    /**< Binary */
+		HEX     /**< Hexadecimal */
+	};
+
+	/**
+	 * @brief Interface for UART.
+	 */
+	class UART
+	{
+	public:
+		/**
+		 * @brief Print single character.
+		 *
+		 * @param c     Character to print
+		 */
+		void print(char c);
+		/**
+		 * @brief Print boolean value.
+		 *
+		 * @param b     Boolean value
+		 */
+		void print(bool b);
+		/**
+		 * @brief Print integer in selected base.
+		 *
+		 * @param num   8-bit unsigned integer
+		 * @param base  Integer base
+		 */
+		void print(uint8_t num, IntegerBase base = IntegerBase::DEC);
+		/**
+		 * @brief Print integer in selected base.
+		 *
+		 * @param num   16-bit unsigned integer
+		 * @param base  Integer base
+		 */
+		void print(uint16_t num, IntegerBase base = IntegerBase::DEC);
+		/**
+		 * @brief Print integer in selected base.
+		 *
+		 * @param num   32-bit unsigned integer
+		 * @param base  Integer base
+		 */
+		void print(uint32_t num, IntegerBase base = IntegerBase::DEC);
+		/**
+		 * @brief Print integer in selected base.
+		 *
+		 * @param num   Integer
+		 * @param base  Integer base
+		 */
+		void print(size_t num, IntegerBase base = IntegerBase::DEC);
+		/**
+		 * @brief Print c-string.
+		 *
+		 * @param str   Null terminated string
+		 */
+		void print(const char * str);
+		/**
+		 * @brief Print string.
+		 *
+		 * @param str       String buffer
+		 * @parma length    String length
+		 */
+		void print(const char * str, size_t length);
+
+
+		/**
+		 * @brief Print new-line.
+		 */
+		void println();
+		/**
+		 * @brief Print single character followed by a new-line.
+		 *
+		 * @param c     Character to print
+		 */
+		void println(char c);
+		/**
+		 * @brief Print boolean value followed by a new-line.
+		 *
+		 * @param b     Boolean value
+		 */
+		void println(bool b);
+		/**
+		 * @brief Print integer in selected base followed by a new-line.
+		 *
+		 * @param num   8-bit unsigned integer
+		 * @param base  Integer base
+		 */
+		void println(uint8_t num, IntegerBase base = IntegerBase::DEC);
+		/**
+		 * @brief Print integer in selected base followed by a new-line.
+		 *
+		 * @param num   16-bit unsigned integer
+		 * @param base  Integer base
+		 */
+		void println(uint16_t num, IntegerBase base = IntegerBase::DEC);
+		/**
+		 * @brief Print integer in selected base followed by a new-line.
+		 *
+		 * @param num   32-bit unsigned integer
+		 * @param base  Integer base
+		 */
+		void println(uint32_t num, IntegerBase base = IntegerBase::DEC);
+		/**
+		 * @brief Print integer in selected base followed by a new-line.
+		 *
+		 * @param num   Integer
+		 * @param base  Integer base
+		 */
+		void println(size_t num, IntegerBase base = IntegerBase::DEC);
+		/**
+		 * @brief Print c-string followed by a new-line.
+		 *
+		 * @param str   Null terminated string
+		 */
+		void println(const char * str);
+		/**
+		 * @brief Print string followed by a new-line.
+		 *
+		 * @param str       String buffer
+		 * @parma length    String length
+		 */
+		void println(const char * str, size_t length);
+
+
+		/**
+		 * @brief Write buffer to UART.
+		 *
+		 * @param buffer    Source buffer
+		 * @param size      Number of bytes in buffer
+		 */
+		virtual void write(const uint8_t * buffer, size_t size) = 0;
+
+	private:
+		/**
+		 * @brief Print unsigned integer in selected base.
+		 *
+		 * @param value     Unsigned integer value
+		 * @param base      Integer base
+		 * @param fmt       printf format string for base 10
+		 * @param size      Size of value in bytes
+		 */
+		void printBase(uintmax_t value, IntegerBase base, const char * fmt, size_t size);
+		/**
+		 * @brief Print unsigned integer in base 10.
+		 *
+		 * @param value     Unsigned integer value
+		 * @param fmt       printf format string
+		 */
+		void printDec(uintmax_t value, const char * fmt);
+		/**
+		 * @brief Print unsigned integer in base 2.
+		 *
+		 * @param value     Unsigned integer value
+		 * @param digits    Number of digits to print
+		 */
+		void printBin(uintmax_t value, size_t digits);
+		/**
+		 * @brief Print unsigned integer in base 16.
+		 *
+		 * @param value     Unsigned integer value
+		 * @param digits    Number of digits to print
+		 */
+		void printHex(uintmax_t value, size_t digits);
+	};
+} // namespace sta
+
+
+#endif // STA_UART_HPP
diff --git a/src/uart.cpp b/src/uart.cpp
new file mode 100644
index 0000000..660c5ed
--- /dev/null
+++ b/src/uart.cpp
@@ -0,0 +1,187 @@
+#include <sta/uart.hpp>
+
+#include <cstdio>
+#include <cstring>
+
+
+namespace sta
+{
+	void UART::print(char c)
+	{
+		print(&c, 1);
+	}
+
+	void UART::print(bool b)
+	{
+		print(b ? "true" : "false");
+	}
+
+	void UART::print(uint8_t num, IntegerBase base /* = IntegerBase::DEC */)
+	{
+		printBase(num, base, "%u", sizeof(num));
+	}
+
+	void UART::print(uint16_t num, IntegerBase base /* = IntegerBase::DEC */)
+	{
+		printBase(num, base, "%u", sizeof(num));
+	}
+
+	void UART::print(uint32_t num, IntegerBase base /* = IntegerBase::DEC */)
+	{
+		printBase(num, base, "%lu", sizeof(num));
+	}
+
+	void UART::print(size_t num, IntegerBase base /* = IntegerBase::DEC */)
+	{
+		printBase(num, base, "%u", sizeof(num));
+	}
+
+	void UART::print(const char * str)
+	{
+		print(str, strlen(str));
+	}
+
+	void UART::print(const char * str, size_t length)
+	{
+		write(reinterpret_cast<const uint8_t *>(str), length);
+	}
+
+
+	void UART::println()
+	{
+		print("\r\n", 2);
+	}
+
+	void UART::println(char c)
+	{
+		print(&c, 1);
+		println();
+	}
+
+	void UART::println(bool b)
+	{
+		print(b);
+		println();
+	}
+
+	void UART::println(uint8_t num, IntegerBase base /* = IntegerBase::DEC */)
+	{
+		print(num, base);
+		println();
+	}
+
+	void UART::println(uint16_t num, IntegerBase base /* = IntegerBase::DEC */)
+	{
+		print(num, base);
+		println();
+	}
+
+	void UART::println(uint32_t num, IntegerBase base /* = IntegerBase::DEC */)
+	{
+		print(num, base);
+		println();
+	}
+
+	void UART::println(size_t num, IntegerBase base /* = IntegerBase::DEC */)
+	{
+		print(num, base);
+		println();
+	}
+
+	void UART::println(const char * str)
+	{
+		println(str, strlen(str));
+	}
+
+	void UART::println(const char * str, size_t length)
+	{
+		print(str, length);
+		println();
+	}
+
+
+
+	void UART::printBase(uintmax_t num, IntegerBase base, const char * fmt, size_t size)
+	{
+		switch (base)
+		{
+		case IntegerBase::DEC:
+			printDec(num, fmt);
+			break;
+
+		case IntegerBase::BIN:
+			// Digits in base 2 = size in bytes * 8
+			printBin(num, size * 8);
+			break;
+
+		case IntegerBase::HEX:
+			// Digits in base 16 = size in bytes * 2
+			printHex(num, size * 2);
+			break;
+
+		default:
+			print("<invalid_base>");
+		}
+	}
+
+	void UART::printDec(uintmax_t num, const char * fmt)
+	{
+		char buffer[64];
+		sprintf(buffer, fmt, num);
+		print(buffer);
+	}
+
+	void UART::printBin(uintmax_t value, size_t digits)
+	{
+		// Need 8 digits for every byte
+		char buffer[sizeof(value) * 8];
+
+		// Check bounds
+		if (digits > sizeof(buffer))
+		{
+			print("<bin_value_too_big>");
+			return;
+		}
+		// Nothing to do
+		if (digits == 0)
+			return;
+
+		for (size_t i = 0; i < digits; ++i)
+		{
+			// Convert bit to '0' or '1'
+			// First digit in buffer is MSB in value, so shift from high to low
+			buffer[i] = '0' + ((value >> (digits - 1 - i)) & 0x1);
+		}
+
+		print(buffer, digits);
+	}
+
+	void UART::printHex(uintmax_t value, size_t digits)
+	{
+		// Need 2 digits for every byte
+		char buffer[sizeof(value) * 2];
+
+		// Check bounds
+		if (digits > sizeof(buffer))
+		{
+			print("<hex_value_too_big>");
+			return;
+		}
+		// Nothing to do
+		if (digits == 0)
+			return;
+
+		for (size_t i = 0; i < digits; ++i)
+		{
+			// Convert 4 bits to hex
+			// First digit in buffer is 4 MSBs in value, so shift from high to low
+			uint8_t hex = ((value >> ((digits - 1 - i) * 4)) & 0xF);
+			if (hex > 9)
+				buffer[i] = 'A' + (hex - 9);
+			else
+				buffer[i] = '0' + hex;
+		}
+
+		print(buffer, digits);
+	}
+} // namespace sta