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+/*!
+    \file  systick.h
+    \brief the header file of systick
+
+    \version 2017-02-10, V1.0.0, firmware for GD32F30x
+    \version 2018-10-10, V1.1.0, firmware for GD32F30x
+    \version 2018-12-25, V2.0.0, firmware for GD32F30x
+*/
+
+/*
+    Copyright (c) 2018, GigaDevice Semiconductor Inc.
+
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without modification, 
+are permitted provided that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright notice, this 
+       list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright notice, 
+       this list of conditions and the following disclaimer in the documentation 
+       and/or other materials provided with the distribution.
+    3. Neither the name of the copyright holder nor the names of its contributors 
+       may be used to endorse or promote products derived from this software without 
+       specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
+IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
+INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
+NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
+WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
+OF SUCH DAMAGE.
+*/
+
+#ifndef SYS_TICK_H
+#define SYS_TICK_H
+
+#include <stdint.h>
+
+#define SysTick_Freq  (1000U)  // Hz
+#define SysTick_Tick  (1000U / SysTick_Freq)
+
+/* configure systick */
+void systick_config(void);
+/* delay a time in milliseconds */
+void delay(uint32_t count);
+/* delay a time in milliseconds with low power */
+void delay_lp(uint32_t count);
+/* delay decrement */
+void delay_decrement(void);
+/* get system tick */
+uint32_t get_tick(void);
+/* suspend system tick */
+void systick_DisableIRQ(void);
+/* resume system tick */
+void systick_EnableIRQ(void);
+
+void systick_Disable(void);
+void systick_Enable(void);
+void systick_deinit(void);
+
+#endif /* SYS_TICK_H */