1 files changed, 13 insertions, 0 deletions
diff --git a/common.h b/common.h
new file mode 100644
index 0000000..ecf2c27
--- /dev/null
+++ b/common.h
@@ -0,0 +1,13 @@
+#ifndef COMMON_H
+#define COMMON_H
+
+/* cpu runs at 1mhz */
+#define F_CPU 1000000
+
+#define sleepwhile(cond) \
+	sleep_enable (); \
+	while (cond) { sleep_cpu (); } \
+	sleep_disable ();
+
+#endif /* COMMON_H */
+