COMMUNICATION BRIDGE FOR EMBEDDED SYSTEMS IN CAN NETWORK

V diplomski nalogi je opisan razvoj aplikacij, ki povezane v celoto tvorijo premostitev fizičnega CAN vodila preko vgrajenega sistema. Razvoj vsebuje analizo obstoječega vgrajenega sistema in načrtovanje programske opreme za mikrokrmilnik, ki je ključni del tega sistema. Analiziramo delovanje simulatorja, s katerim simuliramo ostalo strojno opremo enega izmed sistemov in razvijamo modul zanj. Opisane so tehnologije uporabljene pri razvoju sistema. Med te spada analiza TCP protokola za prenos podatkov in analiza CAN omrežja. Prikazan je sistem uokvirjanja, ki se uporablja v vseh aplikacijah in omogoča enostavno kodiranje in dekodiranje sporočil. CAN sporočila namreč zakodirana natovorimo v TCP paketke, kjer se kot takšni preko interneta pošiljajo med sistemi. S tem smo premostili CAN vodilo preko obstoječih tehnologij, kar pomeni, da se naši sistemi lahko med seboj pogovarjajo ne da se nahajajo na isti lokaciji.This graduation thesis describes development of applications which all connected into whole make a bridge from the physical CAN bus over embedded system. Development contains analysis of the existing embedded system and planning the software for the microcontroller which is a key factor on the system. We analyze the simulator which we use to simulate the hardware of another existing system used and we develop the module for it. We describe technologies that are used in development of the system. Here we have analysis of the TCP protocol for transferring data and analysis of the CAN network. We show the developed system of framing used in all applications which makes coding or decoding data easy. Coded CAN messages are loaded into TCP packets where we send them over the internet between the systems. With this we have bridged the CAN bus using existing technologies, which means that our systems can now communicate without being on the same location