需要移植过来。
用STM32，音质应该有提升。
具体实现，采样、存储 有几点需要注意哦。
/******************** (C) COPYRIGHT 2006 STMicroelectronics ********************
* File Name : voicerecorder.c
* Author : MCD Application Team
* Date First Issued : 03/10/2006
* Description : This file includes the voice recorder driver for the
* STR75x-EVAL demonstration.
********************************************************************************
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