SNIP_CLASSIC_LAYEREDSOFTWAREARCHITECTURE_SECTION_1_SC_D

Interfaces: Interaction of Layers Example “Data Transformation” (4) – COM Based Transformation Goal The COM Based Transformer provides serialization functionality to the transformer chain based on a fixed communication matrix. The fixed communication matrix allows an optimized placement of signals into PDUs (e.g. a booleandata can be configured to only occupy one bit in the PDU). This enables the usage of transformer chains in low payload networks like Can or Lin. Functionality ➢The COM Based Transformer is the first transformer (serializer) and gets the data from the application via the RTE. ➢Based on the COM configuration (communication matrix) the data is serialized exactly in the same way as the COM module would have done it (endianess, sign extension). ➢Other transformers may enhance the payload to have CRCs and sequence counters (SC). ➢The transformer payload is passed to the COM module as one array of byte via the Com_SendSignalGroupArray API. ➢The COM module can be configured to perform transmission mode selection based on the communication matrix definition. page id: srs14 CRC D 1 SC D 2 D 3 D 4 Signal Pdu AUTOSAR COM RTE Transformer Coordination Application Layer SW-C Other Transformer Com Based Transformer Buffer 1 Buffer 2 R22-11 AUTOSAR_EXP_LayeredSoftwareArchitecture 114 of 193