Realized the function of buzzer singing and implementation on FPGA development board

sing
....\db
....\..\liubingqi14.db_info
....\..\liubingqi14.sld_design_entry.sci
....\..\prev_cmp_liubingqi14.asm.qmsg
....\..\prev_cmp_liubingqi14.fit.qmsg
....\..\prev_cmp_liubingqi14.map.qmsg
....\..\prev_cmp_liubingqi14.qmsg
....\..\prev_cmp_liubingqi14.tan.qmsg
....\incremental_db
....\..............\README
....\..............\compiled_partitions
....\..............\...................\liubingqi14.db_info
....\..............\...................\liubingqi14.root_partition.cmp.atm
....\..............\...................\liubingqi14.root_partition.cmp.dfp
....\..............\...................\liubingqi14.root_partition.cmp.hdbx
....\..............\...................\liubingqi14.root_partition.cmp.kpt
....\..............\...................\liubingqi14.root_partition.cmp.logdb
....\..............\...................\liubingqi14.root_partition.cmp.rcf
....\..............\...................\liubingqi14.root_partition.map.atm
....\..............\...................\liubingqi14.root_partition.map.dpi
....\..............\...................\liubingqi14.root_partition.map.hdbx
....\..............\...................\liubingqi14.root_partition.map.kpt
....\liubingqi14.asm.rpt
....\liubingqi14.done
....\liubingqi14.fit.rpt
....\liubingqi14.fit.smsg
....\liubingqi14.fit.summary
....\liubingqi14.flow.rpt
....\liubingqi14.map.rpt
....\liubingqi14.map.summary
....\liubingqi14.pin
....\liubingqi14.pof
....\liubingqi14.qpf
....\liubingqi14.qsf
....\liubingqi14.qws
....\liubingqi14.sof
....\liubingqi14.tan.rpt
....\liubingqi14.tan.summary
....\liubingqi14.v
....\liubingqi14_assignment_defaults.qdf

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