基于cpld的超声波测距仪研制

《基于cpld的超声波测距仪研制》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、基于CPLD的超声波测距仪研制摘要：一般的超声波测距仪可用于固定物位或液位的测量，适用于建筑物内部、液位高度的测量。本超声波测距仪采用CPLD器件，运用VHDL编写程序，使用MAX+plusII软件进行软硬件设计的仿真和调试，最终实现测距功能。本超声波测距仪设计中采用的是MAX7000s系列中的EPM7128SLC84-15的CPLD器件，其最高频率可达，可用于组合逻辑电路、时序逻辑电路、算法、双端口RAM等的设计。充分利用了其多达128个宏单元、68pin可编程I/O口，使该器件可以将分频功能、计数功能、显示编码功能、振荡功能全部集于一体。又因其延

2、时平均的特点，保证了测距结果精度高、响应速度快。关键词:可编程逻辑器件超声波测距Abstract:Generallyspeaking,theultrasonicrangefindercanbeusedtomeasuretheobjectpositionandliquidlevel,itissuitedtomeasurethehEightofbuilding’sinternalandwaterline.MydevicemakeuseofCPLD(ComplexProgrammableLogicDevice)andusesVHDL(VeryHighSpe

3、edIntegratedCircuitHardwareDescriptionLanguage)toprogram.UtilizingthesoftwareofMAXPlusIItocarryoutthesimulationanddebug.ThedesignoftheultrasonicrangefinderappliestheEPM7128SLC84-1appliance.ThehighestworkingfrequencyisuptoanditisbelongtotheMAX7000Sdevicesseries.TheEPM7128SLC84-1

4、canrealizethedesignofthecompoundinglogiccircuit,sequentiallogiccircuit,calculation,doubleports-settingsRAMandthelike.TomakeuseoftheEPM7128SLC84-1withupto12macrocellsthatarecombinedintoof1macrocellsgroupsandmaximumuserI/Opins,thedevicehascomprisedfrequencydivider,counterfunction

5、block,displayfunctionandoscillator.EnsurethehighmeasurementprecisionandquickrespondduetotheEPM7128SLC84-15’saveragepin-to-pinlogicResourceArchivesSystem(HRAS)issuitableforfilinghousingresourcerelatedfile.Throughthesystem,userscaninput,auditandmanagehousingresourcefiles.Moreimpo

6、rtant,onecouldeasilytranslatetheoriginalhardcopytoelectronicrecordfileviascanningsystemandsavetotheHPMSsystemforbrowsingfutureordevelopforotherpotentialusage;HPMSdoesnotonlyhaveaverystrongenginetosupporthousingpropertyfileinput,browse,reviewandmanagement,buthasextendableandgene

7、ralfeature.Thispaperintroducesthedetailofmainfunctiondevelopmentanddescribesthedevelopmentprocessofsubmanagementsystem.Keyword:CPLD,VHDL,Ultrasonicwave,Distancemeasurement