USB嵌入式主机上的打印机类

Typicalembeddedapplicationsareratherrestrictedin

howtheycanpresentdatatoauser.Limitedamounts

ofdatacanbedisplayedonanLCDoragraphicaldis-

play,butlargeamountsofdataaremoreproblematical.

Often,dataistransferredviaanelectricalinterfaceor

viaelectronicstoragemedia,suchasathumbdrive,for

furtherexamination,butitcanbehandytoobtainan

immediatesnapshotofthedata.TheUSBPrinter

Class,usedononeofMicrochip’smicrocontrollerswith

theUSBOTGperipheral,allowsanembeddedapplica-

tiontoutilizeaUSBprintertoprovidehardcopyoutput

forquickreviewandpossiblearchival.AN1233USBPrinterClassonanEmbeddedHostAuthor:KimOttenUSBPRINTERCLASSMicrochipTechnologyInc.The“USBDeviceClassDefinitionforPrintingDevices”specification,availablefromtheUSBImplementersForum,definestheconfiguration,interfaceandINTRODUCTIONendpointdescriptors,aswellasthecommunicationsTypicalembeddedapplicationsareratherrestrictedinprotocolusedtocommun