diff --git a/uart.hpp b/uart.hpp
index c7cef43..45c1738 100644
--- a/uart.hpp
+++ b/uart.hpp
@@ -1,5 +1,7 @@
 #pragma once
 
+#include <stdint.h>
+
 #include "config.hpp"
 #include "hardware0.hpp"
 #include "hardware1.hpp"
@@ -12,6 +14,38 @@
 
 namespace uart {
 
+namespace detail {
+
+template <typename T, T limit, size_t Base>
+static constexpr size_t cntDigits()
+{
+	T num = limit;
+	size_t cnt = 0;
+
+	if (num < 0) {
+		num = -num;
+		++cnt;
+	}
+
+	do {
+		num /= 10;
+		++cnt;
+	} while (num > 0);
+
+	return cnt;
+}
+
+template <typename T, size_t Base>
+static constexpr size_t maxNumDigits()
+{
+	T minDigits = cntDigits<T, util::NumericLimits<T>::min(), Base>();
+	T maxDigits = cntDigits<T, util::NumericLimits<T>::max(), Base>();
+
+	return (minDigits < maxDigits) ? maxDigits : minDigits;
+}
+
+} // namespace detail
+
 template <class Driver>
 class Uart {
   public:
@@ -70,6 +104,32 @@ class Uart {
 			txByte(ch);
 	}
 
+	template <typename T, size_t Base = 10>
+	static inline void txNumber(const T &val)
+	{
+		// static_assert(util::is_integral_v<T>, "Only supported on integral types");
+
+		constexpr size_t numDigits = detail::maxNumDigits<T, Base>();
+		typename Driver::data_t buffer[numDigits];
+		typename Driver::data_t *bufEnd = buffer + numDigits - 1;
+
+		T digits = val;
+
+		if (digits < 0) {
+			digits = -digits;
+			txByte('-');
+		}
+
+		do {
+			typename Driver::data_t lastDigit = digits % Base;
+			*bufEnd-- = '0' + lastDigit;
+			digits /= Base;
+		} while (digits > 0);
+
+		for (typename Driver::data_t *buf = bufEnd + 1; buf < buffer + numDigits; ++buf)
+			txByte(*buf);
+	}
+
 	//////////////////////////////////////////////////////////////////////////
 	// Output stream overloads
 
@@ -86,91 +146,91 @@ class Uart {
 	}
 
 	template <typename... Ts>
-	Uart &operator<<(char)
+	Uart &operator<<(char) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}
 
 	template <typename... Ts>
-	Uart &operator<<(unsigned char)
+	Uart &operator<<(unsigned char) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}
 
 	template <typename... Ts>
-	Uart &operator<<(short)
+	Uart &operator<<(short) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}
 
 	template <typename... Ts>
-	Uart &operator<<(unsigned short)
+	Uart &operator<<(unsigned short) const
+	{
+		static_assert(util::always_false_v<Ts...>, "Not implemented");
+	}
+
+	Uart &operator<<(const int &val)
+	{
+		txNumber(val);
+		return *this;
+	}
+
+	template <typename... Ts>
+	Uart &operator<<(unsigned int) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}
 
 	template <typename... Ts>
-	Uart &operator<<(int)
+	Uart &operator<<(long) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}
 
 	template <typename... Ts>
-	Uart &operator<<(unsigned int)
+	Uart &operator<<(unsigned long) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}
 
 	template <typename... Ts>
-	Uart &operator<<(long)
+	Uart &operator<<(long long) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}
 
 	template <typename... Ts>
-	Uart &operator<<(unsigned long)
+	Uart &operator<<(unsigned long long) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}
 
 	template <typename... Ts>
-	Uart &operator<<(long long)
+	Uart &operator<<(float) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}
 
 	template <typename... Ts>
-	Uart &operator<<(unsigned long long)
+	Uart &operator<<(double) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}
 
 	template <typename... Ts>
-	Uart &operator<<(float)
+	Uart &operator<<(long double) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}
 
 	template <typename... Ts>
-	Uart &operator<<(double)
+	Uart &operator<<(bool) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}
 
 	template <typename... Ts>
-	Uart &operator<<(long double)
-	{
-		static_assert(util::always_false_v<Ts...>, "Not implemented");
-	}
-
-	template <typename... Ts>
-	Uart &operator<<(bool)
-	{
-		static_assert(util::always_false_v<Ts...>, "Not implemented");
-	}
-
-	template <typename... Ts>
-	Uart &operator<<(const void *)
+	Uart &operator<<(const void *) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}
@@ -179,91 +239,91 @@ class Uart {
 	// Input stream overloads
 
 	template <typename... Ts>
-	Uart &operator>>(char &)
+	Uart &operator>>(char &) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}
 
 	template <typename... Ts>
-	Uart &operator>>(unsigned char &)
+	Uart &operator>>(unsigned char &) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}
 
 	template <typename... Ts>
-	Uart &operator>>(short &)
+	Uart &operator>>(short &) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}
 
 	template <typename... Ts>
-	Uart &operator>>(unsigned short &)
+	Uart &operator>>(unsigned short &) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}
 
 	template <typename... Ts>
-	Uart &operator>>(int &)
+	Uart &operator>>(int &) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}
 
 	template <typename... Ts>
-	Uart &operator>>(unsigned int &)
+	Uart &operator>>(unsigned int &) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}
 
 	template <typename... Ts>
-	Uart &operator>>(long &)
+	Uart &operator>>(long &) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}
 
 	template <typename... Ts>
-	Uart &operator>>(unsigned long &)
+	Uart &operator>>(unsigned long &) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}
 
 	template <typename... Ts>
-	Uart &operator>>(long long &)
+	Uart &operator>>(long long &) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}
 
 	template <typename... Ts>
-	Uart &operator>>(unsigned long long &)
+	Uart &operator>>(unsigned long long &) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}
 
 	template <typename... Ts>
-	Uart &operator>>(float &)
+	Uart &operator>>(float &) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}
 
 	template <typename... Ts>
-	Uart &operator>>(double &)
+	Uart &operator>>(double &) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}
 
 	template <typename... Ts>
-	Uart &operator>>(long double &)
+	Uart &operator>>(long double &) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}
 
 	template <typename... Ts>
-	Uart &operator>>(bool &)
+	Uart &operator>>(bool &) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}
 
 	template <typename... Ts>
-	Uart &operator>>(const void *&)
+	Uart &operator>>(const void *&) const
 	{
 		static_assert(util::always_false_v<Ts...>, "Not implemented");
 	}