Use FPGA development board digital tube cycle after 2 individual school number four, according to the key set countdown time, button2 control whether to start the countdown, button1 control countdown time plus 1, button0 control countdown time minus 1, when the countdown time to time, 10 LED lights flashing alarm, serial alarm, 9600, even parity, the computer display after receiving the data.

按键控制报警
............\db
............\..\led.asm.qmsg
............\..\led.asm_labs.ddb
............\..\led.cbx.xml
............\..\led.cmp.bpm
............\..\led.cmp.cdb
............\..\led.cmp.ecobp
............\..\led.cmp.hdb
............\..\led.cmp.kpt
............\..\led.cmp.logdb
............\..\led.cmp.rdb
............\..\led.cmp_merge.kpt
............\..\led.cuda_io_sim_cache.31um_ff_1200mv_0c_fast.hsd
............\..\led.cuda_io_sim_cache.31um_tt_1200mv_85c_slow.hsd
............\..\led.db_info
............\..\led.eco.cdb
............\..\led.eda.qmsg
............\..\led.eds_overflow
............\..\led.fit.qmsg
............\..\led.fnsim.cdb
............\..\led.fnsim.hdb
............\..\led.fnsim.qmsg
............\..\led.hier_info
............\..\led.hif
............\..\led.lpc.html
............\..\led.lpc.rdb
............\..\led.lpc.txt
............\..\led.map.bpm
............\..\led.map.cdb
............\..\led.map.ecobp
............\..\led.map.hdb
............\..\led.map.kpt
............\..\led.map.logdb
............\..\led.map.qmsg
............\..\led.map_bb.cdb
............\..\led.map_bb.hdb
............\..\led.map_bb.logdb
............\..\led.pre_map.cdb
............\..\led.pre_map.hdb
............\..\led.rpp.qmsg
............\..\led.rtlv.hdb
............\..\led.rtlv_sg.cdb
............\..\led.rtlv_sg_swap.cdb
............\..\led.sgate.rvd
............\..\led.sgate_sm.rvd
............\..\led.sgdiff.cdb
............\..\led.sgdiff.hdb
............\..\led.sim.cvwf
............\..\led.sim.hdb
............\..\led.sim.qmsg
............\..\led.sim.rdb
............\..\led.simfam
............\..\led.sld_design_entry.sci
............\..\led.sld_design_entry_dsc.sci
............\..\led.sta.qmsg
............\..\led.sta.rdb
............\..\led.sta_cmp.6_slow_1200mv_85c.tdb
............\..\led.syn_hier_info
............\..\led.tiscmp.fast_1200mv_0c.ddb
............\..\led.tiscmp.slow_1200mv_0c.ddb
............\..\led.tiscmp.slow_1200mv_85c.ddb
............\..\led.tis_db_list.ddb
............\..\led.tmw_info
............\..\led_global_asgn_op.abo
............\..\prev_cmp_led.asm.qmsg
............\..\prev_cmp_led.eda.qmsg
............\..\prev_cmp_led.fit.qmsg
............\..\prev_cmp_led.map.qmsg
............\..\prev_cmp_led.qmsg
............\..\prev_cmp_led.sim.qmsg
............\..\prev_cmp_led.sta.qmsg
............\..\wed.wsf
............\incremental_db
............\..............\compiled_partitions
............\..............\...................\led.root_partition.cmp.atm
............\..............\...................\led.root_partition.cmp.dfp
............\..............\...................\led.root_partition.cmp.hdbx
............\..............\...................\led.root_partition.cmp.kpt
............\..............\...................\led.root_partition.cmp.logdb
............\..............\...................\led.root_partition.cmp.rcf
............\..............\...................\led.root_partition.map.atm
............\..............\...................\led.root_partition.map.dpi
............\..............\...................\led.root_partition.map.hdbx
............\..............\...................\led.root_partition.map.kpt
............\..............\README
............\led.asm.rpt
............\led.done
............\led.dpf
............\led.eda.rpt
............\led.fit.rpt
............\led.fit.summary
............\led.flow.rpt
............\led.map.rpt
............\led.map.smsg
............\led.map.summary
............\led.pin
............\led.qpf
............\led.qsf
............\led.qws

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