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-rw-r--r--libmaple/libmaple_types.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/libmaple/libmaple_types.h b/libmaple/libmaple_types.h
index ca98f6f..d49f95a 100644
--- a/libmaple/libmaple_types.h
+++ b/libmaple/libmaple_types.h
@@ -43,5 +43,7 @@ typedef long long int64;
typedef void (*voidFuncPtr)(void);
+#define __io volatile
+
#endif