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1、AN3128ApplicationnoteSTM32embeddedgraphicobjects/touchscreenlibraryIntroductionThislibraryisafirmwarepackagewhichcontainsacollectionofroutines,datastructures,andmacroscoveringthemainfeaturesofagraphiclibraryandsupportingaHIDdevicetointeractwiththegraphicobjects(touchscreen
2、,joystick,andpushbutton).ThelibraryisgeneralpurposeandcanbeexecutedonanyCPU,8/16/32-bit,toguaranteethemaximumportabilityofanyarchitectureorLCDcontroller,anditprovidesagraphicaluserinterface(GUI)foranyapplicationthatoperateswithagraphicalLCD.Whilethefirmwarelibraryfunctions
3、withallcurrentlyavailableSTM32microcontrollers,(STM32F10xxx,STM32L1xxandSTM32F2xxseries),thisdocumentdescribesthefirmwarelibrarythroughtheimplementationofagraphiclibraryforembeddedsystemsbasedontheSTM32F10xxxmicrocontrollerfamily.Itcaneasilybeusedintheuserapplicationwithou
4、tanin-depthstudyofSTM32registers,SPI,andI2Cread/writeoperationsteps.Asaresult,usingthefirmwarelibrarysavessignificanttimethatwouldotherwisebespentincoding,whileatthesametimereducingtheapplicationdevelopmentandintegrationcosts.Thefirmwarearchitectureisdevelopedinseparatelay
5、ersandtheHAL(hardwareabstractionlayer)makesitindependentfromthemicrocontrollerusedinthefinalapplication.Asetoffontsisincluded:8x12and16x24.Eventhoughthefirmwarelibrarysourcecodeisdevelopedin'ANSI-C',thecodearchitecturefollowsanOOP(objectorientedprogramming)approach.Section
6、1describesthedocumentandlibraryrules.Section2highlightsthefeaturesoftheSTMPE811andexplainsitshardwareinterfacewithadevicemicrocontroller(STM32inthiscase).Section3and4describethelibraryfeatures,itsarchitectureanditsexportedAPIs(applicationprogramminginterfaces)indetail.Sect
7、ion5containsanexampleapplicationsourcecodedescribinghowtoconfigureandusethelibrary.Section6containsinformationabouttheembeddedGUIresourceeditorapplication.June2011DocID16918Rev51/105www.st.comContentsAN3128Contents1Documentandlibraryrules..................................1
8、01.1Acronyms.................................................102Touchscreencontrollerhard
