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Recently, vehicle networks have increased complexity due to the demand for autonomous driving or connected devices. This increasing complexity requires high bandwidth. As a result, vehicle manufacturers have begun using Ethernet-based communication for high-speed links. In order to deal with the heterogeneity of such networks where legacy automotive buses have to coexist with high-speed Ethernet links vehicle manufacturers introduced a vehicle gateway system. The system uses Ethernet as a backbone between domain controllers and CAN buses for communication between internal controllers. As a central point in the vehicle, the gateway is constantly exchanging vehicle data in a heterogeneous communication environment between the existing CAN and Ethernet networks. In an in-vehicle network context where the communications are strictly time-constrained, it is necessary to measure the delay for such routing task.

These days in automotive industry, AUTOSAR has been increasingly used as a standard and unified software platform as vehicle electronics have becoming more variety, more performance and more complicated. MCAL is a software driver which belongs to lowest level in AUTOSAR software structure. MCAL directly access the microcontroller hardware and is provided by microcontroller supplier like Infineon to handle microcontroller peripherals. And in cases for special dedicated functions of microcontroller or for special requirements, Complex Device Driver could be used as legacy software instead of MCAL. The paper is structured as follows: First, the SPI requirements for vehicle applications such as chassis will be shown. Then, the current AUTOSAR specification for SPI MCAL will be explained in detail. Next, the sequential SPI communication and the parallel SPI communication with multi-nodes will be discussed.