diff --git a/code/espurna/libs/tuyadimmer.h b/code/espurna/libs/tuyadimmer.h
index 8b13789179..a1c73c97a7 100644
--- a/code/espurna/libs/tuyadimmer.h
+++ b/code/espurna/libs/tuyadimmer.h
@@ -1 +1,45 @@
+/*
+ * Copyright (C) 2016 Stefan Brüns <stefan.bruens@rwth-aachen.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ */
 
+#ifndef __PWM_H__
+#define __PWM_H__
+
+/*SUPPORT UP TO 8 PWM CHANNEL*/
+#ifndef PWM_CHANNEL_NUM_MAX
+#define PWM_CHANNEL_NUM_MAX 8
+#endif
+
+struct pwm_param {
+    uint32 period;
+    uint32 freq;
+    uint32  duty[PWM_CHANNEL_NUM_MAX];  //PWM_CHANNEL<=8
+};
+
+/* pwm_init should be called only once, for now  */
+void pwm_init(uint32 period, uint32 *duty,uint32 pwm_channel_num,uint32 (*pin_info_list)[3]);
+void pwm_start(void);
+
+void pwm_set_duty(uint32 duty, uint8 channel);
+uint32 pwm_get_duty(uint8 channel);
+void pwm_set_period(uint32 period);
+uint32 pwm_get_period(void);
+
+uint32 get_pwm_version(void);
+void set_pwm_debug_en(uint8 print_en);
+
+#endif