From 47bb4d22c6a6d62efeff3d43240853cbaf248472 Mon Sep 17 00:00:00 2001
From: DrZiplok <DrZiplok@f9c3cf11-9bcb-44bc-f272-b75c42450872>
Date: Sun, 19 Dec 2010 19:57:34 +0000
Subject: [PATCH] Use the presence of UDRx as an indication that the serial
 port x might need to be supported.

git-svn-id: https://arducopter.googlecode.com/svn/trunk@1200 f9c3cf11-9bcb-44bc-f272-b75c42450872
---
 libraries/FastSerial/FastSerial.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/libraries/FastSerial/FastSerial.cpp b/libraries/FastSerial/FastSerial.cpp
index 467c88d45f..27d5ac2596 100644
--- a/libraries/FastSerial/FastSerial.cpp
+++ b/libraries/FastSerial/FastSerial.cpp
@@ -33,8 +33,12 @@
 #include "FastSerial.h"
 #include "WProgram.h"
 
-#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
+#if   defined(UDR3)
 # define FS_MAX_PORTS   4
+#elif defined(UDR2)
+# define FS_MAX_PORTS   3
+#elif defined(UDR1)
+# define FS_MAX_PORTS   2
 #else
 # define FS_MAX_PORTS   1
 #endif