File list (Check if you may need any files):
【A】PWM应用：蜂鸣器发声
........................\buzzer.c
........................\buzzer.h
........................\Debug
........................\.....\Exe
........................\.....\List
........................\.....\Obj
........................\.....\...\buzzer.pbi
........................\.....\...\Demo.pbd
........................\.....\...\main.pbi
........................\.....\...\startup_ewarm.pbi
........................\.....\...\systemInit.pbi
........................\Demo.dep
........................\Demo.ewd
........................\Demo.ewp
........................\Demo.eww
........................\main.c
........................\settings
........................\........\Demo.cspy.bat
........................\startup_ewarm.c
........................\systemInit.c
........................\systemInit.h
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