Kuyini SPI-interface

SPI-interface yasungulwa Motorola. Namuhla-ke ingenye ethandwa kakhulu, ngenxa yesivinini yaso ephezulu lula enesimo kuzo zonke lezo ubheke uhlobo serial. Ngaphezu kwalokho, SPI-interface futhi isimiso uxhumano. Ngokuyisisekelo, SPI logic idatha (master-isigqila) phakathi kwamadivaysi amabili ahlukene. Izakhiwo balalela ingasaphathwa eyisebenzisa, njengoba besho, "kuzimo", it alinikezi ezingeni olandelwayo aphansi. nomkhiqizi ngamunye ungenza okuthile okungokwabo.

SPI-interface incazelo

Logic of kudivayisi esinjalo ukudluliswa kwedatha serial (bit by bit). Kulesi sigcawu nokufundwa abahlukene ngesikhathi ngumuntu isignali ekhethekile clock ibhasi ekhethekile (ngokuthi "ibhasi isikhathi" noma "ukuvumelanisa"). Ngu ngokwahlukana ehloselwe ukuthi idatha kulungiselelwa futhi inqubo wokufundwayo lwenzeka okuphambene iwashi onqenqemeni elakhiwe ebhasini. Nale ihlukaniswe ngokucacile ngesikhathi interlace ukufundwa kanye nezilungiselelo, kuba nokwenzeka ukusebenzisa sinye siyafanana ukubhalisa ukuthola futhi ngokudlulisa ulwazi. Kuyinto ngaphansi kwalesi simiso futhi bahlakulele SPI-interface. Nokho, ukuthuthukiswa ubuchwepheshe hhayi emi namanje, ngo amanani elikhulu kakhulu inkumbulo alikho izinkinga, futhi iningi amadivayisi abe ehlukile input bese okukhipha amarejista. Lapha e Ngamafuphi esixoxe ngazo indlela SPI esibonakalayo luyatholakala.

Incazelo ukusebenza kudivayisi

Kudivayisi odala iwashi pulses (control) nesikhathi ibhasi, 'ngenkosi' (master). Le divayisi elawula yonke inqubo ukushintshanisa kwe-data, okungukuthi, inquma ukuqala lapho exchange, lapho ukuqedela, bangaki ibhithi yokudlulisa ulwazi nokunye .. Idivayisi yesibili iqhaza ku exchange, ebizwa ngokuthi "sigqila." Le divayisi nganoma iyiphi indlela kuthinte iwashi ibhasi. Yokushintshisana-Duplex egcwele (yokudlulisela zombili izinkomba kanyekanye) SP- esibonakalayo isebenzisa imigqa emine:

- Mosi - input bese okukhipha ye-master senceku. Mayelana nalokhu kukhona yokudlulisa ulwazi kusukela inezinhlobo owamukelayo.

- Miso - master input bese okukhipha "sigqila." Ngalokhu ukuziphatha master uthola idatha kusuka kudivayisi asizayo.

- SCLK - ibhasi iwashi. Mayelana nalokhu, lo "abaholayo" kudivayisi edonsa iwashi pulses.

- SS - Ukukhethwa "sigqila." Nale wire master elawula kuseshini exchange.

amazinga logic-zero kuthiwa okubhalwe, futhi iyunithi voltage ukubaluleka ebhasini idatha (miso futhi Mosi). Amabutho ama-SS isignali okhombisa ukuphela nokuqala kuseshini yokwaziswa exchange. Ngokuvamile kuba ephambene. Lokhu kusho ukuthi ngesikhathi ukushintshanisa kwe-data "master" kudivayisi kumele ukufakwa emgqeni SS isignali ezingeni eliphansi, futhi ekupheleni exchange - okusezingeni eliphezulu. Ukuba khona SS-level ukudluliswa ivumela ukuhlela "nceku" kumadivaysi amaningana usebenzisa isignali iwashi kanye ibhasi idatha ngaphandle yezifiso ezengeziwe. Nokho, uma uxhumano ezifana kuyadingeka ukuze awunikeze idivayisi reception kusukela umugqa ngamunye ehlukile SS.