File list (Check if you may need any files):
doc
...\音调vs频率.jpg
prj
...\BUZZER_PWM.asm.rpt
...\BUZZER_PWM.done
...\BUZZER_PWM.dpf
...\BUZZER_PWM.fit.rpt
...\BUZZER_PWM.fit.smsg
...\BUZZER_PWM.fit.summary
...\BUZZER_PWM.flow.rpt
...\BUZZER_PWM.map.rpt
...\BUZZER_PWM.map.summary
...\BUZZER_PWM.pin
...\BUZZER_PWM.pof
...\BUZZER_PWM.qpf
...\BUZZER_PWM.qsf
...\BUZZER_PWM.tan.rpt
...\BUZZER_PWM.tan.summary
...\Tcl_script.tcl
...\db
...\..\BUZZER_PWM.amm.cdb
...\..\BUZZER_PWM.asm.qmsg
...\..\BUZZER_PWM.asm.rdb
...\..\BUZZER_PWM.asm_labs.ddb
...\..\BUZZER_PWM.cbx.xml
...\..\BUZZER_PWM.cmp.cdb
...\..\BUZZER_PWM.cmp.hdb
...\..\BUZZER_PWM.cmp.kpt
...\..\BUZZER_PWM.cmp.logdb
...\..\BUZZER_PWM.cmp.rdb
...\..\BUZZER_PWM.cmp.tdb
...\..\BUZZER_PWM.cmp0.ddb
...\..\BUZZER_PWM.db_info
...\..\BUZZER_PWM.fit.qmsg
...\..\BUZZER_PWM.hier_info
...\..\BUZZER_PWM.hif
...\..\BUZZER_PWM.idb.cdb
...\..\BUZZER_PWM.lpc.html
...\..\BUZZER_PWM.lpc.rdb
...\..\BUZZER_PWM.lpc.txt
...\..\BUZZER_PWM.map.cdb
...\..\BUZZER_PWM.map.hdb
...\..\BUZZER_PWM.map.logdb
...\..\BUZZER_PWM.map.qmsg
...\..\BUZZER_PWM.pre_map.cdb
...\..\BUZZER_PWM.pre_map.hdb
...\..\BUZZER_PWM.rtlv.hdb
...\..\BUZZER_PWM.rtlv_sg.cdb
...\..\BUZZER_PWM.rtlv_sg_swap.cdb
...\..\BUZZER_PWM.sgdiff.cdb
...\..\BUZZER_PWM.sgdiff.hdb
...\..\BUZZER_PWM.sld_design_entry.sci
...\..\BUZZER_PWM.sld_design_entry_dsc.sci
...\..\BUZZER_PWM.smart_action.txt
...\..\BUZZER_PWM.syn_hier_info
...\..\BUZZER_PWM.tan.qmsg
...\..\BUZZER_PWM.tis_db_list.ddb
...\..\logic_util_heursitic.dat
...\incremental_db
...\..............\README
...\..............\compiled_partitions
...\..............\...................\BUZZER_PWM.db_info
...\..............\...................\BUZZER_PWM.root_partition.map.kpt