stm32F103与PCM5102A与Helix软解播放MP3

主芯片使用STM32F103RET 使用Helix开源代码实现软解播放MP3 使用PCM5102A实现I2S解码，由于该芯片不需要MCLK输入，播放时干扰更小，效果非常好，个从感觉比VS1053B听起来更舒服。

/**
  ******************************************************************************
  * @file    system_stm32f1xx.c
  * @author  MCD Application Team
  * @version V4.1.0
  * @date    29-April-2016
  * @brief   CMSIS Cortex-M3 Device Peripheral Access layer System Source File.
  * 
  * 1.  This file provides two functions and one global variable to be called from 
  *     user application:
  *      - SystemInit（）: Setups the system clock （System clock source PLL Multiplier
  *                      factors AHB/APBx prescalers and Flash settings）. 
  *                      This function is called at startup just after reset and 
  *                      before branch to main program. This call is made inside
  *                      the “startup_stm32f1xx_xx.s“ file.
  *
  *      - SystemCoreClock variable: Contains the core clock （HCLK） it can be used
  *                                  by the user application to setup the SysTick 
  *                                  timer or configure other parameters.
  *                                     
  *      - SystemCoreClockUpdate（）: Updates the variable SystemCoreClock and must
  *                                 be called whenever the core clock is changed
  *                                 during program execution.
  *
  * 2. After each device reset the HSI （8 MHz） is used as system clock source.
  *    Then SystemInit（） function is called in “startup_stm32f1xx_xx.s“ file to
  *    configure the system clock before to branch to main program.
  *
  * 4. The default value of HSE crystal is set to 8 MHz （or 25 MHz depending on
  *    the product used） refer to “HSE_VALUE“. 
  *    When HSE is used as system clock source directly or through PLL and you
  *    are using different crystal you have to adapt the HSE value to your own
  *    configuration.
  *        
  ******************************************************************************
  * @attention
  *
  * 
© COPYRIGHT（c） 2016 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 WARRANTIE

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件     542970  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Include\stm32f100xb.h

     文件     587973  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Include\stm32f100xe.h

     文件     492587  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Include\stm32f101x6.h

     文件     502788  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Include\stm32f101xb.h

     文件     580299  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Include\stm32f101xe.h

     文件     597371  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Include\stm32f101xg.h

     文件     585549  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Include\stm32f102x6.h

     文件     594987  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Include\stm32f102xb.h

     文件     917060  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Include\stm32f103x6.h

     文件     927261  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Include\stm32f103xb.h

     文件    1013638  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Include\stm32f103xe.h

     文件    1027719  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Include\stm32f103xg.h

     文件    1300804  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Include\stm32f105xc.h

     文件    1381619  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Include\stm32f107xc.h

     文件       8815  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Include\stm32f1xx.h

     文件       3335  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Include\system_stm32f1xx.h

     文件      15094  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Source\Templates\arm\startup_stm32f100xb.s

     文件      16682  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Source\Templates\arm\startup_stm32f100xe.s

     文件      12531  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Source\Templates\arm\startup_stm32f101x6.s

     文件      12904  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Source\Templates\arm\startup_stm32f101xb.s

     文件      15016  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Source\Templates\arm\startup_stm32f101xe.s

     文件      15775  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Source\Templates\arm\startup_stm32f101xg.s

     文件      12853  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Source\Templates\arm\startup_stm32f102x6.s

     文件      13238  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Source\Templates\arm\startup_stm32f102xb.s

     文件      13416  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Source\Templates\arm\startup_stm32f103x6.s

     文件      13801  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Source\Templates\arm\startup_stm32f103xb.s

     文件      16358  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Source\Templates\arm\startup_stm32f103xe.s

     文件      16812  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Source\Templates\arm\startup_stm32f103xg.s

     文件      16620  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Source\Templates\arm\startup_stm32f105xc.s

     文件      16800  2016-07-19 09:58  软解MP3 - PCM5102\Drivers\CMSIS\Device\ST\STM32F1xx\Source\Templates\arm\startup_stm32f107xc.s

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