This a driver pwm buzzer, the buzzer is a typical example of driving

入门实验_17_蜂鸣器 ：PWM蜂鸣器驱动实验\Quartus\BUZZER.asm.rpt
............................................\.......\BUZZER.done
............................................\.......\BUZZER.dpf
............................................\.......\BUZZER.fit.rpt
............................................\.......\BUZZER.fit.smsg
............................................\.......\BUZZER.fit.summary
............................................\.......\BUZZER.flow.rpt
............................................\.......\BUZZER.map.rpt
............................................\.......\BUZZER.map.summary
............................................\.......\BUZZER.pin
............................................\.......\BUZZER.pof
............................................\.......\BUZZER.qpf
............................................\.......\BUZZER.qsf
............................................\.......\BUZZER.qws
............................................\.......\BUZZER.sof
............................................\.......\BUZZER.tan.rpt
............................................\.......\BUZZER.tan.summary
............................................\.......\db\BUZZER.asm.qmsg
............................................\.......\..\BUZZER.asm_labs.ddb
............................................\.......\..\BUZZER.cbx.xml
............................................\.......\..\BUZZER.cmp.bpm
............................................\.......\..\BUZZER.cmp.cdb
............................................\.......\..\BUZZER.cmp.ecobp
............................................\.......\..\BUZZER.cmp.hdb
............................................\.......\..\BUZZER.cmp.kpt
............................................\.......\..\BUZZER.cmp.logdb
............................................\.......\..\BUZZER.cmp.rdb
............................................\.......\..\BUZZER.cmp.tdb
............................................\.......\..\BUZZER.cmp0.ddb
............................................\.......\..\BUZZER.cmp2.ddb
............................................\.......\..\BUZZER.cmp_merge.kpt
............................................\.......\..\BUZZER.db_info
............................................\.......\..\BUZZER.eco.cdb
............................................\.......\..\BUZZER.fit.qmsg
............................................\.......\..\BUZZER.hier_info
............................................\.......\..\BUZZER.hif
............................................\.......\..\BUZZER.lpc.html
............................................\.......\..\BUZZER.lpc.rdb
............................................\.......\..\BUZZER.lpc.txt
............................................\.......\..\BUZZER.map.bpm
............................................\.......\..\BUZZER.map.cdb
............................................\.......\..\BUZZER.map.ecobp
............................................\.......\..\BUZZER.map.hdb
............................................\.......\..\BUZZER.map.kpt
............................................\.......\..\BUZZER.map.logdb
............................................\.......\..\BUZZER.map.qmsg
............................................\.......\..\BUZZER.map_bb.cdb
............................................\.......\..\BUZZER.map_bb.hdb
............................................\.......\..\BUZZER.map_bb.logdb
............................................\.......\..\BUZZER.pre_map.cdb
............................................\.......\..\BUZZER.pre_map.hdb
............................................\.......\..\BUZZER.rtlv.hdb
............................................\.......\..\BUZZER.rtlv_sg.cdb
............................................\.......\..\BUZZER.rtlv_sg_swap.cdb
............................................\.......\..\BUZZER.sgdiff.cdb
............................................\.......\..\BUZZER.sgdiff.hdb
............................................\.......\..\BUZZER.sld_design_entry.sci
..........................................

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