LwIP TCPIP stack demonstration for STM32F2x7xx microcontrollers.pdf

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1、AN3384ApplicationnoteLwIPTCP/IPstackdemonstrationforSTM32F2x7xxmicrocontrollers1IntroductionSTM32F2x7xxmicrocontrollersfeaturesahigh-quality10/100Mbit/sEthernetperipheralthatsupportsboththeMediaIndependentInterface(MII)andReducedMediaIndependentInterface(RMII)toint

2、erfacewiththePhysicalLayer(PHY).WhenworkingwithanEthernetcommunicationinterface,aTCP/IPstackisusuallyusedforcommunicatingoveralocalorawideareanetwork.ThisapplicationnotepresentsademonstrationpackagebuiltontopofthelwIP(LightweightIP)TCP/IPstackwhichisanopensourcesta

3、ckintendedforembeddeddevices.ThisdemonstrationpackagecontainsnineapplicationsrunningontopofthelwIPstack:●Applicationsrunninginstandalonemode(withoutanRTOS):–AWebserver–ATFTPserver–ATCPechoclientapplication–ATCPechoserverapplication–AUDPechoclientapplication–AUDPech

4、oserverapplication●ApplicationsrunningwiththeFreeRTOSoperatingsystem:–AWebserverbasedonnetconnAPI–AWebserverbasedonsocketAPI–ATCP/UDPechoserverapplicationbasedonnetconnAPIOctober2011DocID018698Rev21/47www.st.comContentsAN3384Contents1Introduction...................

5、.............................12LwIPstackoverview.........................................62.1Stackfeatures..............................................62.2FolderorganizationofthelwIPstack.............................72.3LwIPAPIoverview.............................

6、..............72.3.1RawAPI..................................................72.3.2NetconnAPI...............................................92.3.3SocketAPI................................................92.4lwIPbuffermanagement.....................................10

7、2.4.1Packetbufferstructure......................................102.4.2APIformanagingpbufs.....................................112.5InterfacinglwIPtoSTM32F2x7Ethernetnetworkinterface...........113STM32F2x7lowleveldriveroverview..........................133.1GlobalE

8、thernetMAC/DMAfunctions............................133.1.1EthernetMAC/DMAconfigurationparameters....................143.2DMAdescriptorhandling...