DE2 board audio control program the WM8731 control through the I2C bus, the code is the reference program audio solution/encoder configuration.

DE2_i2sound\.sopc_builder\filters.xml
...........\.............\preferences.xml
...........\CLOCK_500.bsf
...........\CLOCK_500.v
...........\db\DE2_i2sound.amm.cdb
...........\..\DE2_i2sound.asm.qmsg
...........\..\DE2_i2sound.asm.rdb
...........\..\DE2_i2sound.asm_labs.ddb
...........\..\DE2_i2sound.cbx.xml
...........\..\DE2_i2sound.cmp.bpm
...........\..\DE2_i2sound.cmp.cdb
...........\..\DE2_i2sound.cmp.hdb
...........\..\DE2_i2sound.cmp.kpt
...........\..\DE2_i2sound.cmp.logdb
...........\..\DE2_i2sound.cmp.rdb
...........\..\DE2_i2sound.cmp0.ddb
...........\..\DE2_i2sound.cmp1.ddb
...........\..\DE2_i2sound.cmp_merge.kpt
...........\..\DE2_i2sound.db_info
...........\..\DE2_i2sound.fit.qmsg
...........\..\DE2_i2sound.hier_info
...........\..\DE2_i2sound.hif
...........\..\DE2_i2sound.idb.cdb
...........\..\DE2_i2sound.lpc.html
...........\..\DE2_i2sound.lpc.rdb
...........\..\DE2_i2sound.lpc.txt
...........\..\DE2_i2sound.map.bpm
...........\..\DE2_i2sound.map.cdb
...........\..\DE2_i2sound.map.hdb
...........\..\DE2_i2sound.map.kpt
...........\..\DE2_i2sound.map.logdb
...........\..\DE2_i2sound.map.qmsg
...........\..\DE2_i2sound.map_bb.cdb
...........\..\DE2_i2sound.map_bb.hdb
...........\..\DE2_i2sound.map_bb.logdb
...........\..\DE2_i2sound.pre_map.cdb
...........\..\DE2_i2sound.pre_map.hdb
...........\..\DE2_i2sound.root_partition.map.reg_db.cdb
...........\..\DE2_i2sound.rtlv.hdb
...........\..\DE2_i2sound.rtlv_sg.cdb
...........\..\DE2_i2sound.rtlv_sg_swap.cdb
...........\..\DE2_i2sound.sgdiff.cdb
...........\..\DE2_i2sound.sgdiff.hdb
...........\..\DE2_i2sound.sld_design_entry.sci
...........\..\DE2_i2sound.sld_design_entry_dsc.sci
...........\..\DE2_i2sound.smart_action.txt
...........\..\DE2_i2sound.sta.qmsg
...........\..\DE2_i2sound.sta.rdb
...........\..\DE2_i2sound.sta_cmp.6_slow.tdb
...........\..\DE2_i2sound.syn_hier_info
...........\..\DE2_i2sound.tis_db_list.ddb
...........\..\logic_util_heursitic.dat
...........\DE2_i2sound.asm.rpt
...........\DE2_i2sound.bdf
...........\DE2_i2sound.done
...........\DE2_i2sound.dpf
...........\DE2_i2sound.fit.rpt
...........\DE2_i2sound.fit.smsg
...........\DE2_i2sound.fit.summary
...........\DE2_i2sound.flow.rpt
...........\DE2_i2sound.jdi
...........\DE2_i2sound.map.rpt
...........\DE2_i2sound.map.summary
...........\DE2_i2sound.pin
...........\DE2_i2sound.pof
...........\DE2_i2sound.qpf
...........\DE2_i2sound.qsf
...........\DE2_i2sound.qws
...........\DE2_i2sound.sdc
...........\DE2_i2sound.sof
...........\DE2_i2sound.sta.rpt
...........\DE2_i2sound.sta.summary
...........\DE2_i2sound.tan.summary
...........\DE2_i2sound_assignment_defaults.qdf
...........\demo_batch\DE2_i2sound.sof
...........\..........\test.bat
...........\i2c.bsf
...........\i2c.v
...........\.ncremental_db\compiled_partitions\DE2_i2sound.db_info
...........\..............\...................\DE2_i2sound.root_partition.cmp.cdb
...........\..............\...................\DE2_i2sound.root_partition.cmp.dfp
...........\..............\...................\DE2_i2sound.root_partition.cmp.hdb
...........\..............\...................\DE2_i2sound.root_partition.cmp.kpt
...........\..............\...................\DE2_i2sound.root_partition.cmp.logdb
...........\..............\...................\DE2_i2sound.root_partition.cmp.rcfdb
...........\..............\...................\DE2_i2sound.root_partition.map.cdb
...........\..............\...................\DE2_i2sound.root_partition.map.dpi
...........\..............\...................\DE2_i2sound.root_partition.map.hbdb.cdb
...........\..............\...................\DE2_i2sound.root_partition.map.hbdb.hb_info
...........\..............\...................\DE2_i2sound.root_partition.map.hbdb.hdb
...........\..............\...................\DE2_i2sound.root_partition.map.hbdb.sig
...........\..............\...................\DE2_i2sound.root_partition.map.hdb
...........\..............\...................\DE2_i2sound.root_partition.map.kpt
...........\..............\README
...........\keytr.bsf
...........\keytr.v
.........

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