Experimental phenomena: The experiment code control development board DS0 and buzzer, DS0 flashes, indicating the program is running, the buzzer will periodically issue a " beep" sound, at intervals of 0.3 seconds

实验2 蜂鸣器实验\HARDWARE\BEEP\beep.c
................\........\....\beep.h
................\........\LED\led.c
................\........\...\led.h
................\keilkill.bat
................\OBJ\TEST.hex
................\readme.txt
................\SYSTEM\delay\delay.c
................\......\.....\delay.h
................\......\readme.txt
................\......\sys\core_cm4.h
................\......\...\core_cm4_simd.h
................\......\...\core_cmFunc.h
................\......\...\core_cmInstr.h
................\......\...\stm32f4xx.h
................\......\...\sys.c
................\......\...\sys.h
................\......\...\system_stm32f4xx.h
................\......\usart\usart.c
................\......\.....\usart.h
................\USER\JLinkSettings.ini
................\....\startup_stm32f40_41xxx.s
................\....\test.c
................\....\TEST.uvguix.Administrator
................\....\TEST.uvoptx
................\....\TEST.uvprojx
................\HARDWARE\BEEP
................\........\LED
................\SYSTEM\delay
................\......\sys
................\......\usart
................\HARDWARE
................\OBJ
................\SYSTEM
................\USER
实验2 蜂鸣器实验

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