1 files changed, 20 insertions, 0 deletions
diff --git a/include/bcd.h b/include/bcd.h
new file mode 100644
index 0000000..c545308
--- /dev/null
+++ b/include/bcd.h
@@ -0,0 +1,20 @@
+/* Permission is hereby granted to copy, modify and redistribute this code
+ * in terms of the GNU Library General Public License, Version 2 or later,
+ * at your option.
+ */
+
+/* macros to translate to/from binary and binary-coded decimal (frequently
+ * found in RTC chips).
+ */
+
+#ifndef _BCD_H
+#define _BCD_H
+
+#define BCD2BIN(val)	(((val) & 0x0f) + ((val)>>4)*10)
+#define BIN2BCD(val)	((((val)/10)<<4) + (val)%10)
+
+/* backwards compat */
+#define BCD_TO_BIN(val) ((val)=BCD2BIN(val))
+#define BIN_TO_BCD(val) ((val)=BIN2BCD(val))
+
+#endif /* _BCD_H */