1 files changed, 5 insertions, 0 deletions
diff --git a/global.h b/global.h
index 02fdedc..b041a65 100644
--- a/global.h
+++ b/global.h
@@ -1,3 +1,6 @@
+#ifndef GLOBAL_H
+#define GLOBAL_H
+
 // board type, raspi2
 #define RASPI 2
 
@@ -10,3 +13,5 @@
 #define GPIO_BASE 0x20200000
 #endif // RASPI == 3 || RASPI == 2
 #endif // RASPI == 4
+
+#endif // GLOBAL_H