--- /dev/null
+#ifndef SPLIT_KEYBOARD_UTIL_H
+#define SPLIT_KEYBOARD_UTIL_H
+
+#include <stdbool.h>
+#include "eeconfig.h"
+
+#define SLAVE_I2C_ADDRESS 0x32
+
+extern volatile bool isLeftHand;
+extern volatile bool contacted_by_master;
+
+bool has_usb(void);
+
+// slave version of matix scan, defined in matrix.c
+void matrix_slave_scan(void);
+
+
+#endif