Fundamentals and Application Areas - Vector Informatik

XCP ? The Standard Protocol for ECU Development

Fundamentals and Application Areas

Andreas Patzer | Rainer Zaiser

Andreas Patzer | Rainer Zaiser

XCP ? The Standard Protocol for ECU Development

Date December 2016 Reproduction only with expressed permission from Vector Informatik GmbH, Ingersheimer Str. 24, 70499 Stuttgart, Germany ? 2016 by Vector Informatik GmbH. All rights reserved. This book is only intended for personal use, but not for technical or commercial use. It may not be used as a basis for contracts of any kind. All information in this book was compiled with the greatest possible care, but Vector Informatik does not assume any guarantee or warranty whatsoever for the correctness of the information it contains. The liability of Vector Informatik is excluded, except for malicious intent or gross negligence, to the extent that laws do not make it legally liable.

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XCP The Standard Protocol for ECU Development

Fundamentals and Application Areas

Andreas Patzer, Rainer Zaiser Vector Informatik GmbH

Table of Contents

Introduction............................................................................................................................................ 7

1 Fundamentals of the XCP Protocol............................................................................................13

1.1 XCP Protocol Layer................................................................................................................. 19 1.1.1 Identification Field.........................................................................................................21 1.1.2 Timestamp......................................................................................................................21 1.1.3 Data Field....................................................................................................................... 22

1.2 Exchange of CTOs................................................................................................................... 22 1.2.1 XCP Command Structure........................................................................................... 22 1.2.2 CMD................................................................................................................................. 25 1.2.3 RES................................................................................................................................... 28 1.2.4 ERR................................................................................................................................... 28 1.2.5 EV..................................................................................................................................... 29 1.2.6 SERV................................................................................................................................ 29 1.2.7 Calibrating Parameters in the Slave........................................................................ 29

1.3 Exchanging DTOs ? Synchronous Data Exchange.......................................................... 32 1.3.1 Measurement Methods: Polling versus DAQ.......................................................... 33 1.3.2 DAQ Measurement Method....................................................................................... 34 1.3.3 STIM Calibration Method............................................................................................ 42 1.3.4 XCP Packet Addressing for DAQ and STIM............................................................ 43 1.3.5 Bypassing = DAQ + STIM............................................................................................ 45 1.3.6 Time Correlation and Synchronization.................................................................... 45

1.4 XCP Transport Layers............................................................................................................ 49 1.4.1 CAN.................................................................................................................................. 49 1.4.2 CAN FD........................................................................................................................... 52 1.4.3 FlexRay............................................................................................................................ 54 1.4.4 Ethernet.......................................................................................................................... 57 1.4.5 SxI..................................................................................................................................... 59 1.4.6 USB................................................................................................................................. 60 1.4.7 LIN................................................................................................................................... 60

1.5 XCP Services............................................................................................................................. 61 1.5.1 Memory Page Swapping..............................................................................................61 1.5.2 Saving Memory Pages ? Data Page Freezing........................................................ 63 1.5.3 Flash Programming...................................................................................................... 63 1.5.4 Automatic Detection of the Slave............................................................................ 65 1.5.5 Block Transfer Mode for Upload, Download and Flashing.................................. 66 1.5.6 Cold Start Measurement............................................................................................ 67 1.5.7 Security Mechanisms with XCP.................................................................................68

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