The howling sound suppressing the code based on stm32f407

AD+DMA+1024FFT+IIR+DA\BlankPrj.map
.....................\BlankPrj.uvgui.Administrator
.....................\BlankPrj.uvgui.laoyl
.....................\BlankPrj.uvgui.Maxwell
.....................\BlankPrj.uvgui_Administrator.bak
.....................\BlankPrj.uvgui_laoyl.bak
.....................\BlankPrj.uvgui_Maxwell.bak
.....................\BlankPrj.uvopt
.....................\BlankPrj.uvproj
.....................\BlankPrj_Stm32F4Proj.dep
.....................\BlankPrj_uvopt.bak
.....................\BlankPrj_uvproj.bak
.....................\CMSIS\arm_common_tables.h
.....................\.....\arm_const_structs.h
.....................\.....\arm_math.h
.....................\.....\core_cm4.h
.....................\.....\core_cm4_simd.h
.....................\.....\core_cmFunc.h
.....................\.....\core_cmInstr.h
.....................\.....\stm32f4xx.h
.....................\.....\system_stm32f4xx.c
.....................\.....\system_stm32f4xx.h
.....................\Debug\BlankPrj.axf
.....................\.....\BlankPrj.build_log.htm
.....................\.....\BlankPrj.htm
.....................\.....\BlankPrj.lnp
.....................\.....\BlankPrj.plg
.....................\.....\BlankPrj.sct
.....................\.....\BlankPrj.tra
.....................\.....\common.crf
.....................\.....\common.d
.....................\.....\common.o
.....................\.....\ExtDll.iex
.....................\.....\main.crf
.....................\.....\main.d
.....................\.....\main.o
.....................\.....\misc.crf
.....................\.....\misc.d
.....................\.....\misc.o
.....................\.....\startup_stm32f4xx.d
.....................\.....\startup_stm32f4xx.o
.....................\.....\stm32f4xx_adc.crf
.....................\.....\stm32f4xx_adc.d
.....................\.....\stm32f4xx_adc.o
.....................\.....\stm32f4xx_can.crf
.....................\.....\stm32f4xx_can.d
.....................\.....\stm32f4xx_can.o
.....................\.....\stm32f4xx_crc.crf
.....................\.....\stm32f4xx_crc.d
.....................\.....\stm32f4xx_crc.o
.....................\.....\stm32f4xx_cryp.crf
.....................\.....\stm32f4xx_cryp.d
.....................\.....\stm32f4xx_cryp.o
.....................\.....\stm32f4xx_cryp_aes.crf
.....................\.....\stm32f4xx_cryp_aes.d
.....................\.....\stm32f4xx_cryp_aes.o
.....................\.....\stm32f4xx_cryp_des.crf
.....................\.....\stm32f4xx_cryp_des.d
.....................\.....\stm32f4xx_cryp_des.o
.....................\.....\stm32f4xx_cryp_tdes.crf
.....................\.....\stm32f4xx_cryp_tdes.d
.....................\.....\stm32f4xx_cryp_tdes.o
.....................\.....\stm32f4xx_dac.crf
.....................\.....\stm32f4xx_dac.d
.....................\.....\stm32f4xx_dac.o
.....................\.....\stm32f4xx_dbgmcu.crf
.....................\.....\stm32f4xx_dbgmcu.d
.....................\.....\stm32f4xx_dbgmcu.o
.....................\.....\stm32f4xx_dcmi.crf
.....................\.....\stm32f4xx_dcmi.d
.....................\.....\stm32f4xx_dcmi.o
.....................\.....\stm32f4xx_dma.crf
.....................\.....\stm32f4xx_dma.d
.....................\.....\stm32f4xx_dma.o
.....................\.....\stm32f4xx_exti.crf
.....................\.....\stm32f4xx_exti.d
.....................\.....\stm32f4xx_exti.o
.....................\.....\stm32f4xx_flash.crf
.....................\.....\stm32f4xx_flash.d
.....................\.....\stm32f4xx_flash.o
.....................\.....\stm32f4xx_fsmc.crf
.....................\.....\stm32f4xx_fsmc.d
.....................\.....\stm32f4xx_fsmc.o
.....................\.....\stm32f4xx_gpio.crf
.....................\.....\stm32f4xx_gpio.d
.....................\.....\stm32f4xx_gpio.o
.....................\.....\stm32f4xx_hash.crf
.....................\.....\stm32f4xx_hash.d
.....................\.....\stm32f4xx_hash.o
.....................\.....\stm32f4xx_hash_md5.crf
.....................\.....\stm32f4xx_hash_md5.d
.....................\.....\stm32f4xx_has

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