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-rw-r--r--01-system-clock/include/common.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/01-system-clock/include/common.h b/01-system-clock/include/common.h
new file mode 100644
index 0000000..6fc701c
--- /dev/null
+++ b/01-system-clock/include/common.h
@@ -0,0 +1,14 @@
+#ifndef COMMON__H
+#define COMMON__H
+
+/* Define __IO to be volatile if it's not already. */
+#ifndef __IO
+#define __IO volatile
+#endif
+
+#define bool int
+
+#define PACKED __attribute__((packed))
+#define BIT(n) (1 << (n))
+
+#endif /* COMMON_H */