diff --git a/.gitignore b/.gitignore
index fcd85c4..669c770 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 /.project
 /sync.ffs_db
+*.*bak
diff --git a/keywords.txt b/keywords.txt
index a37a8c4..d80bac0 100644
--- a/keywords.txt
+++ b/keywords.txt
@@ -18,3 +18,19 @@ Windowing	KEYWORD2
 Exponent	KEYWORD2
 Revision	KEYWORD2
 MajorPeak	KEYWORD2
+
+#######################################
+# Constants (LITERAL1)
+#######################################
+
+twoPi LITERAL1
+fourPi  LITERAL1
+FFT_FORWARD LITERAL1
+FFT_REVERSE LITERAL1
+FFT_WIN_TYP_RECTANGLE LITERAL1
+FFT_WIN_TYP_HAMMING   LITERAL1
+FFT_WIN_TYP_HANN  LITERAL1
+FFT_WIN_TYP_TRIANGLE  LITERAL1
+FFT_WIN_TYP_BLACKMAN  LITERAL1
+FFT_WIN_TYP_FLT_TOP LITERAL1
+FFT_WIN_TYP_WELCH LITERAL1
diff --git a/library.properties b/library.properties
index 5680ffa..13c1da4 100644
--- a/library.properties
+++ b/library.properties
@@ -1,8 +1,8 @@
 name=arduinoFFT
-version=1.2.3
+version=1.3
 author=kosme <enrique@shapeoko.com>
 maintainer=Enrique Condes <enrique@shapeoko.com>
-sentence=A library for implementing Fast Fourier Transform on Arduino.
+sentence=A library for implementing floating point Fast Fourier Transform calculations on Arduino.
 paragraph=With this library you can calculate the frequency of a sampled signal.
 category=Data Processing
 url=https://github.com/kosme/arduinoFFT
diff --git a/src/arduinoFFT.h b/src/arduinoFFT.h
index 59d9e75..3d72b13 100644
--- a/src/arduinoFFT.h
+++ b/src/arduinoFFT.h
@@ -30,7 +30,9 @@
 #else
 	#include <stdlib.h>
 	#include <stdio.h>
-	#include <avr/io.h>
+	#ifdef __AVR__
+		#include <avr/io.h>
+	#endif
 	#include <math.h>
 	#include "defs.h"
 	#include "types.h"
diff --git a/src/types.h b/src/types.h
index c84bf33..6cd7d85 100644
--- a/src/types.h
+++ b/src/types.h
@@ -19,17 +19,21 @@ typedef   signed long  s32;
 typedef unsigned long long u64;
 typedef   signed long long s64;
 
-/* use inttypes.h instead
-// C99 standard integer type definitions
-typedef unsigned char	uint8_t;
-typedef   signed char	int8_t;
-typedef unsigned short	uint16_t;
-typedef   signed short	int16_t;
-typedef unsigned long	uint32_t;
-typedef   signed long	int32_t;
-typedef unsigned long	uint64_t;
-typedef   signed long	int64_t;
-*/
+// #ifndef __AVR__
+#ifdef __MBED__
+	// use inttypes.h instead
+	// C99 standard integer type definitions
+	typedef unsigned char	uint8_t;
+	typedef   signed char	int8_t;
+	typedef unsigned short	uint16_t;
+	typedef   signed short	int16_t;
+	/*typedef unsigned long	uint32_t;
+	typedef   signed long	int32_t;
+	typedef unsigned long	uint64_t;
+	typedef   signed long	int64_t;
+	*/
+#endif
+
 // maximum value that can be held
 // by unsigned data types (8,16,32bits)
 #define MAX_U08	255