第1个回答 2023-06-07
spi总线工作原理
SPI(SerialPeripheralInterface)isasynchronousserialcommunicationprotocolthatoperatesinfullduplexmode.ThebasicworkingprincipleofSPIinvolvesamasterdevicetransmittingdatatooneormultipleslavedevices,withtheslavesreceivingandtransmittingdatainparallel.
Themasterdevicegeneratesaclocksignalthatdeterminesthespeedofdatatransfer,andcontrolstheflowofdatathroughasetofsharedlinesknownastheMOSI(MasterOutSlaveIn)andMISO(MasterInSlaveOut)lines.Theslavesareselectedusingaseparateslaveselect(SS)lineforeachdevice.
InatypicalSPItransaction,themasterstartsthetransferbyassertingtheSSlineoftheselectedslave,thenitsendsthedataovertheMOSIlineandtheslavereceivesitontheMISOline.Thedatatransfercontinuesuntilthemasterde-assertstheSSline,signalingtheendofthetransaction.