TY - CONF A1 - Dentgen, Manuel A1 - Renner, Sebastian A1 - Mottok, Jürgen A2 - Brinkmann, André A2 - Karl, Wolfgang A2 - Lankes, Stefan A2 - Tomforde, Sven A2 - Pionteck, Thilo A2 - Trinitis, Carsten T1 - Equally Distributed Bus-Communication Access Rights for Inter MCU Communication Using Multimaster SPI T2 - Architecture of Computing Systems - ARCS 2020: 33rd international conference, Aachen, Germany, May 25-28, 2020, proceedings T2 - Lecture notes in computer science ; Bd. 12155 N2 - With the rising complexity and processing power of modern computer systems, the amount of MCU on a single PCB also rises. These microcontrollers often need to communicate with each other to exchange payload and control information in a bidirectional manner. Today’s well-established communication protocols in MCUs either do not fit modern transmission speed requirements or do have an inappropriate master-slave attribute, which does not allow the communication partners to have equal bus access rights. Therefore, this paper introduces an extension of the Serial Peripheral Interface (SPI) to allow an equally distributed access right for the communication interface between two microcontrollers. It simultaneously does fit modern transmission speed requirements of a common network interface, so that the message transmission does not constitute a bottleneck in data processing. Besides the protocol design, we do also provide a first prototype implementation, which constitutes a proof of concept. Y1 - 2021 UR - https://opus4.kobv.de/opus4-oth-regensburg/frontdoor/index/index/docId/1008 SP - 200 EP - 212 ER -