From fe00bff120b147f4bc978d6f11cf7ebe851194d7 Mon Sep 17 00:00:00 2001
From: gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4>
Date: Sat, 28 Jan 2012 09:43:13 +0000
Subject: [PATCH] git-svn-id:
 svn://svn.code.sf.net/p/chibios/svn/branches/stable_2.4.x@3887
 35acf78f-673a-0410-8e92-d51de3d6d3f4

---
 os/hal/platforms/STM32/ext_lld.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/os/hal/platforms/STM32/ext_lld.h b/os/hal/platforms/STM32/ext_lld.h
index d5b40023d..6ef14427b 100644
--- a/os/hal/platforms/STM32/ext_lld.h
+++ b/os/hal/platforms/STM32/ext_lld.h
@@ -43,7 +43,7 @@
 /**
  * @brief   Mask of the available channels.
  */
-#define EXT_CHANNELS_MASK   (EXT_MAX_CHANNELS - 1)
+#define EXT_CHANNELS_MASK   ((1 << EXT_MAX_CHANNELS) - 1)
 
 /**
  * @name    EXTI configuration helpers