| 文件头信息 
 
 /*!
    \file  gd32f1x0_gpio.c
    \brief gpio driver
*/
/*
    Copyright (C) 2016 GigaDevice
    2014-12-26, V1.0.0, firmware for GD32F1x0(x=3,5)
    2016-01-15, V2.0.0, firmware for GD32F1x0(x=3,5,7,9)
    2016-04-30, V3.0.0, firmware update for GD32F1x0(x=3,5,7,9)
*/
 API的风格是
 
 gpio_mode_set(GPIOA
gpio_output_options_set(GPIOA
 |