STM32的BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）程序，亲测能用

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/**************************************************************************//**
 * @file     core_cm3.c
 * @brief    CMSIS Cortex-M3 Core Peripheral Access layer Source File
 * @version  V1.30
 * @date     30. October 2009
 *
 * @note
 * Copyright （C） 2009 ARM Limited. All rights reserved.
 *
 * @par
 * ARM Limited （ARM） is supplying this software for use with Cortex-M 
 * processor based microcontrollers.  This file can be freely distributed 
 * within development tools that are supporting such ARM based processors. 
 *
 * @par
 * THIS SOFTWARE IS PROVIDED “AS IS“.  NO WARRANTIES WHETHER EXPRESS IMPLIED
 * OR STATUTORY INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
 * ARM SHALL NOT 

 属性            大小     日期    时间   名称
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     目录           0  2017-06-22 18:07  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\
     目录           0  2017-06-22 18:07  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\
     目录           0  2017-06-22 18:07  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\
     目录           0  2017-06-22 18:07  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\
     目录           0  2017-06-22 18:07  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\CoreSupport\
     文件       17273  2010-06-07 10:25  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\CoreSupport\core_cm3.c
     文件       85714  2011-02-09 14:59  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\CoreSupport\core_cm3.h
     目录           0  2017-06-22 18:07  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\DeviceSupport\
     目录           0  2017-06-22 18:07  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\DeviceSupport\ST\
     目录           0  2017-06-22 18:07  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\
     文件       26297  2011-03-14 12:31  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\Release_Notes.html
     目录           0  2017-06-22 18:07  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\
     目录           0  2017-06-22 18:07  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\TrueSTUDIO\
     文件       12604  2011-03-10 10:54  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\TrueSTUDIO\startup_stm32f10x_cl.s
     文件       12592  2011-03-10 10:53  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\TrueSTUDIO\startup_stm32f10x_hd.s
     文件       12239  2011-03-10 10:53  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\TrueSTUDIO\startup_stm32f10x_hd_vl.s
     文件        9826  2011-03-10 10:53  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\TrueSTUDIO\startup_stm32f10x_ld.s
     文件       10275  2011-03-10 10:53  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\TrueSTUDIO\startup_stm32f10x_ld_vl.s
     文件       10275  2011-03-10 10:53  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\TrueSTUDIO\startup_stm32f10x_md.s
     文件       10757  2011-03-10 10:53  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\TrueSTUDIO\startup_stm32f10x_md_vl.s
     文件       13252  2011-03-10 10:53  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\TrueSTUDIO\startup_stm32f10x_xl.s
     目录           0  2017-06-22 18:07  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\arm\
     文件       15766  2011-03-10 10:52  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\arm\startup_stm32f10x_cl.s
     文件       15503  2011-03-10 10:52  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\arm\startup_stm32f10x_hd.s
     文件       15692  2011-03-10 10:52  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\arm\startup_stm32f10x_hd_vl.s
     文件       12376  2011-03-10 10:52  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\arm\startup_stm32f10x_ld.s
     文件       13656  2011-03-10 10:52  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\arm\startup_stm32f10x_ld_vl.s
     文件       12765  2011-03-10 10:52  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\arm\startup_stm32f10x_md.s
     文件       14073  2011-03-10 10:51  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\arm\startup_stm32f10x_md_vl.s
     文件       15955  2011-03-10 10:51  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\arm\startup_stm32f10x_xl.s
     目录           0  2017-06-22 18:07  21.BEEP蜂鸣器模拟报警声（STM32神舟IV号-库函数版）\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\gcc_ride7\
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