the code is about STM32F401-Discovery.

STM32F401-Discovery
...................\Applications
...................\............\Audio
...................\............\.....\Audio_playback_and_record
...................\............\.....\.........................\AudioFile
...................\............\.....\.........................\.........\audio.wav
...................\............\.....\.........................\EWARM
...................\............\.....\.........................\.....\Project.ewd
...................\............\.....\.........................\.....\Project.ewp
...................\............\.....\.........................\.....\Project.eww
...................\............\.....\.........................\.....\startup_stm32f401xc.s
...................\............\.....\.........................\.....\stm32f401xc_flash.icf
...................\............\.....\.........................\Inc
...................\............\.....\.........................\...\ffconf.h
...................\............\.....\.........................\...\main.h
...................\............\.....\.........................\...\stm32f4xx_hal_conf.h
...................\............\.....\.........................\...\stm32f4xx_it.h
...................\............\.....\.........................\...\usbh_conf.h
...................\............\.....\.........................\...\waveplayer.h
...................\............\.....\.........................\...\waverecorder.h
...................\............\.....\.........................\MDK-ARM
...................\............\.....\.........................\.......\Project.uvopt
...................\............\.....\.........................\.......\Project.uvproj
...................\............\.....\.........................\.......\startup_stm32f401xc.s
...................\............\.....\.........................\Src
...................\............\.....\.........................\...\main.c
...................\............\.....\.........................\...\stm32f4xx_it.c
...................\............\.....\.........................\...\system_stm32f4xx.c
...................\............\.....\.........................\...\usbh_conf.c
...................\............\.....\.........................\...\waveplayer.c
...................\............\.....\.........................\...\waverecorder.c
...................\............\.....\.........................\TrueSTUDIO
...................\............\.....\.........................\..........\STM32F401-DISCO
...................\............\.....\.........................\..........\...............\.cproject
...................\............\.....\.........................\..........\...............\.project
...................\............\.....\.........................\..........\...............\.settings
...................\............\.....\.........................\..........\...............\.........\com.atollic.truestudio.debug.hardware_device.prefs
...................\............\.....\.........................\..........\...............\STM32F401-DISCO.elf.launch
...................\............\.....\.........................\..........\...............\STM32F401CC_FLASH.ld
...................\............\.....\.........................\..........\startup_stm32f401xc.s
...................\............\.....\.........................\readme.txt
...................\............\FatFs
...................\............\.....\FatFs_USBDisk
...................\............\.....\.............\EWARM
...................\............\.....\.............\.....\Project.ewd
...................\............\.....\.............\.....\Project.ewp
...................\............\.....\.............\.....\Project.eww
...................\............\.....\.............\.....\startup_stm32f401xc.s
...................\............\.....\.............\.....\stm32f401xc_flash.icf
...................\............\.....\.............\Inc
...................\............\.....\.............\...\ffconf.h
...................\............\....

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