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STM32F411REF产生不同占空比的PWM方波信号
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/**
******************************************************************************
* File Name ： gpio.h
* Description ： This file contains all the functions prototypes for
* the gpio
******************************************************************************
** This notice applies to any and all portions of this file
* that are not between comment pairs USER CODE BEGIN and
* USER CODE END. Other portions of this file， whether
* inserted by the user or by software development tools
* are owned by their respective copyright owners.
*
* COPYRIGHT（c） 2017 STMicroelectronics
*
* 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 STMicroelectronics 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.
*
******************************************************************************
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