Isimiso esiyisisekelo sokuxhumana kwe-CAN etafuleni lokulinganisa amakhanda amaningi asijulile

Umbhali: Smartweigh– Isisindo Sezinhloko Eziningi

Ibhasi lesistimu le-CAN (i-CantrollerAreaNetwork), okungukuthi, ibhasi lesistimu yenethiwekhi yendawo yendawo, lisetshenziswe kabanzi ezinhlelweni zokulawula zezimboni, imikhiqizo kagesi kanye nezimboni zezinzwa. Iphrothokholi yebhasi le-CAN inezindinganiso ezimbili zikazwelonke, okungukuthi i-ISO11898 kanye ne-ISO011519. Phakathi kwazo, i-ISO11898 iyincazelo yokuxhumana ngesivinini esikhulu, isivinini sokuxhumana singama-125kbps ~ 1Mbps; ibanga elikhulu lokuxhumana lingu-40m/1Mbps, elingelebhasi lesistimu yokulawula evaliwe.

I-ISO011519 iyincazelo yokuxhumana yesivinini esiphansi enesivinini sokuxhumana esingu-10kbps kuya ku-125kbps. Ibanga elikhulu lokuxhumana lingu-1Km/40kbps, elingokwebhasi lesistimu yesisindo se-open-loop transmission multihead. Inani eliphezulu lamaphuzu okuxhumana ebhasini le-CAN lingu-110 ngenxa yengozi yokumelana nokuxhumana kwebhasi lesistimu kanye ne-resistor kwi-waveform yebhasi lesistimu.

Uma izinga lokwamukela nokuthumela i-serial port kanye namapharamitha e-bit main kufakwe kahle, ukuvumelanisa isizindalwazi samaphoyinti okwamukela nokuthumela kungaqedwa. Ingadlulisa isisindo sedatha sama-multihead ngezindlela eziningana ezifana ne-point-to-point, i-point-to-multipoint kanye nezinhlelo zokusakaza zomhlaba wonke. Uma kukhona indawo yokuxhuma ebhasini le-CAN ukuze kudluliselwe idatha, ithunyelwa kuwo wonke amaphoyinti okuxhuma kwi-inthanethi ngefomethi yemiyalezo.

Kuyo yonke indawo yokuxhuma, ulwazi lwedatha luyamukelwa kungakhathaliseki ukuthi luthunyelwe lona noma cha. Isihlonzi se-11-bit ekuqaleni kweqembu ngalinye lamafomethi emilayezo siyihlonzi, esichaza ukubaluleka kwefomethi yemilayezo. Isihlonzi sefomethi yemilayezo sihlukile kwisofthiwe yesistimu efanayo, ngaphandle kwalokho ukuxhumana kuzoba okungalungile; inqubo yonke yangempela yile: lapho isiteshi sifuna ukudlulisa idatha kwezinye iziteshi, i-CPU yalesi siteshi idlulisela ulwazi lwedatha kanye nesihlonzi sayo. I-IC ehlanganisiwe ye-CAN yale webhusayithi isesimweni sokulungiselela kusengaphambili; lapho ithola ukuthunyelwa kusuka kubhasi lesistimu, iba yisimo sefomethi yemiyalezo yokusunduza.

I-IC ehlanganisiwe ye-CAN ithumela ulwazi lwesisindo sesignali yedatha olunezinhloko eziningi kufomethi ethile yomlayezo ngokuya ngephrothokholi bese iluthumela ebhasini lesistimu. Ngalesi sikhathi, ezinye iziteshi ebhasini lesistimu zisesimweni sokwamukela, futhi isiteshi ngasinye esisesimweni sokwamukela siphendula kumlayezo owamukelwe. Ifomethi yombhalo iyahlolwa, futhi uma ithunyelwa yona, kwenziwa ukuhlaziywa kolwazi lwedatha. Kuthiwani uma kuneminye imininingwane eminingi okufanele idluliselwe lapho ibhasi lesistimu likhululekile? Okokuqala, ifomethi yomyalezo wokucindezela omunye iyamukelwa futhi ihlukaniswa. Noma ngubani obaluleke kakhulu uzohlala ebhasini lesistimu, kanti abanye bazoshiywa. Isibonelo: isiteshi 1, isiteshi 2, isiteshi 3 siphinde sicindezele ifomethi yomlayezo ebhasini lesistimu: 011111, 0100110, 0100111; ibhasi lesistimu lizohlukanisa ifomethi yomlayezo, izinombolo ezimbili zokuqala ziyafana, bese lihlukanisa inombolo yesithathu, isiteshi 1 Ibhithi lesithathu lingu-1, ifomethi yomlayezo izoshiywa, kusele isiteshi 2 nesiteshi 3 kuphela, lapho amabhithi ayisithupha okuqala alezi ziteshi ezimbili afana, kanti ibhithi lesikhombisa lesiteshi 3 lingu-1, nalo lizoshiywa, futhi ekugcineni kuphela Ifomethi yomlayezo yesiteshi 2 igciniwe, ezinye iziteshi zisesimweni sokwamukela, futhi akulula ukusunduza ifomethi yomlayezo ngaphambi kokuba ibhasi lesistimu liphinde libe mahhala.

Lena yindlela yokukhuthaza yesisindo sebhasi lesistimu samakhanda amaningi okuxhumana kwe-CAN;.

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