commit 8be149ac6feb306aa46425acdee7a29b29d2a79d
Author: XANTRONIX Development <dev@xantronix.com>
Date:   Tue May 24 19:47:16 2016 -0500

    Initial commit of sender protocol definitions

diff --git a/include/tabby.h b/include/tabby.h
new file mode 100644
index 0000000..f8eb951
--- /dev/null
+++ b/include/tabby.h
@@ -0,0 +1,27 @@
+#ifndef _TABBY_H
+#define _TABBY_H
+
+typedef enum tabby_command {
+    TABBY_COMMAND_SEND        = 0x01,
+    TABBY_COMMAND_CLOCK_MODE  = 0x02,
+    TABBY_COMMAND_CLOCK_SPEED = 0x03
+};
+
+typedef enum tabby_clock_mode {
+    TABBY_CLOCK_MODE_INTERNAL = 0x01,
+    TABBY_CLOCK_MODE_EXTERNAL = 0x02
+};
+
+typedef enum tabby_clock_speed {
+    TABBY_CLOCK_SPEED_8192HZ  = 0x01,
+    TABBY_CLOCK_SPEED_16384HZ = 0x02,
+    TABBY_CLOCK_SPEED_32768HZ = 0x04,
+    TABBY_CLOCK_SPEED_65536HZ = 0x08
+};
+
+typedef struct _tabby_packet {
+    uint16_t type,
+             value;
+} tabby_packet;
+
+#endif /* _TABBY_H */