diff --git a/firmware/basic/Makefile b/firmware/basic/Makefile
index e831d6d..eb3b501 100644
--- a/firmware/basic/Makefile
+++ b/firmware/basic/Makefile
@@ -19,6 +19,7 @@ OBJS += byteorder.o
 OBJS += random.o
 OBJS += idle.o
 OBJS += config.o
+OBJS += itoa.o
 
 LIBNAME=basic
 
diff --git a/firmware/basic/basic.h b/firmware/basic/basic.h
index c10a31a..d218cd6 100644
--- a/firmware/basic/basic.h
+++ b/firmware/basic/basic.h
@@ -203,5 +203,7 @@ int applyConfig(void);
 
 #define SYSTICKSPEED 10
 
-#endif
+// itoa.c
+const char* IntToStrX(unsigned int num, unsigned int mxlen);
 
+#endif
diff --git a/firmware/basic/itoa.c b/firmware/basic/itoa.c
new file mode 100644
index 0000000..9cc8de5
--- /dev/null
+++ b/firmware/basic/itoa.c
@@ -0,0 +1,15 @@
+#define LEN 32
+
+const char* IntToStrX(unsigned int num, unsigned int mxlen){
+	static char s[LEN+1];
+	char * o=s;
+	int len;
+	s[LEN]=0;
+	for (len=(LEN-1);len>=(LEN-mxlen);len--){
+		s[len]=(num%16)+'0';
+		if(s[len]>'9')
+			s[len]+='A'-'9'-1;
+		num/=16;
+	};
+	return &s[len+1];
+};