LIN Stack: A Software Solution for In-vehicle Sub-networks

 

Business Model of LIN Stack Solution: Know the Value-Adds

Our LIN 2.1 Stack Solution (SAE 2602) is available under a one-time licensing fee model. This engagement model entitles you to leverage the following benefits:

  • You own the source code of the LIN Stack
  • You can also benefit from the ownership of the IP rights
  • As the owner of the IP Rights, your business can deploy this LIN Stack solution across multiple production programs

We offer separate LIN stack solutions for LIN Master and LIN Slave.

Features of Our LIN Stack Solution

The LIN stack solution is designed to be production grade, ready-to-deploy solution. Following are some of the features of our LIN software stack.

  • The LIN subnet is based on a master-slave architecture and we have partnered with our customers to deliver a customized LIN Master and LIN Slave solutions.
  • Within the In-Vehicle Network, LIN Master is integrated with Master ECU (which is part of Body Control Module).
  • LIN Master ensures robust communication and control of the LIN Slave nodes
  • MISRA C compliant auto-code generation in seconds as compared to manual method (3-4 week)
  • This saving in efforts translates into reduction time-to-market and thus development cost.
  • LIN Based Re-programming (Bootloader) over UDS
  • Integration of UDS over LIN TP
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    LIN Stack Integration, Configuration and Testing Service Offerings

    application-analysis

    Development and Integration of LIN Driver:

  • Device Drivers development for the LIN Slave microcontroller
  • Device Drivers development for LIN Master microcontroller
  • Reusable device drivers to ensure reduced development time and cost
  • Support for driver integration for most MCU families
  •  

    Diagnostics-layer

    Development and Configuration of LIN Master:

  • Configuration of the Scheduler Table based on SWRS and LDF files
  • Support for Unconditional, Event, Sporadic and Diagnostics frame
  • Skeleton code for Scheduler Table
  • Integration with the end-user application and HAL
  • Algorithm development for Scheduler Table
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    Diagnostics-layer

    Development and Configuration of LIN Hardware Abstraction Layer:

  • Tx and Rx message configuration from LIN Description File (LDF)
  • Support for both tool based and manual configuration
  • Proprietary LDF to auto-code generation tool
  • Configuration for Software Filtering
  • Vector tool based LDF generation from excel sheet
  • Configurable HAL standard code is part of the stack package
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    testing-services

    Node Configuration, LIN Network Management and LIN TP Configuration:

  • Support for Static and Dynamic Configuration of Nodes (ECUs)
  • Already integrated Read/write to the stack function
  • Sleep/Wake up functionality for the nodes
  • Support for segmentation of large data packets over LIN TP
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    J1939-bootloader

    LIN Stack Support and Maintenance Services:

  • Documentation Support: Low-level design and High-level design documents
  • LIN conformance test using Vector Tools. This ensures robustness of Data Link Layer
  • Unit, Integration and Functional testing services
  • Support for MISRA C Report creation
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    Meet Our Automotive Leaders

     

    LIN Software Stack Factsheet:

    LIN Stack PDF

    Refer to this LIN protocol stack solution factsheet which is designed to provide details of the technical specifications like memory requirement, LIN Stack integration & support services etc.

    Download this LIN protocol stack Factsheet for details about:

    • LIN software stack business model and overview
    • Value-adds of one-time licensing fee engagement model
    • Detail of LIN stack solution package
    • Features of our pre-tested and ready-to-integrate LIN software stack solution
    • Use-cases and applications of LIN protocol stack in automotive industry


    Please refer to LIN software stack FAQ’s for more details.

     

    FAQs About LIN Stack Solution

      Ans. The layered architecture of our LIN stack includes:

      • Low-level drivers (LIN, MCU, EEP, IVT, Timer)
      • LIN Stack (LIN NM and LIN IF)
      • LINTP Layer
      • UDS stack
      • Application Layer

      The Bootloader includes:

      • Bootloader Application
      • UDS (ISO14229) Based Bootloader
      Ans. Our LIN stack includes the following modules

      LIN Master and Slave Drivers

      • LIN Master and Slave Driver, in compliance with LIN 2.1 specifications
      • Interrupt based data handling (both Transmission and Reception).
      • Error handling mechanism is part of the LIN driver software.

      LIN Interface (LIN IF)

      • LN IF handles both Tx and Rx messages.
      • Schedule table will be part of LINIF
      • Tx and Rx messages will be configured in configuration (*.c, *.h) files.
      • Signals will be extracted as per LDF file and sent to application layer via APIs

      LIN TP

      • Handles multi-packet transmission and reception
      Ans. LIN Drivers are developed for the specific microcontroller used in the automotive application. All other modules of the LIN stack are hardware agnostics.

      We have expertise in developing LIN drivers for all the widely used MCU families. This includes Renesas, TI, Fujistsu and others.

      Ans. Our automotive team has delivered several LIN stack projects to customers from across US, Europe and India.

      We can share the detailed case studies of the projects and related information, once we sign the Non-disclosure agreement.

      Ans. Yes. As per our Service Level Agreement (SLA) for the LIN Stack, we will provide the software configuration and integration services, along with the LIN stack license.

      The integration and configuration services will take care of both low-level drivers as well as the application-level integration.

      Ans. We perform various tests in the course of LIN software stack development. Prior to the final project delivery, our LIN stack solution undergoes the following testing procedures:

      1. Unit level Testing
      2. Functional Testing
      3. Data Link Layer Compliance testing, using Vector Testing Tools
      Ans. Whether to use the manual method or the PC based tool, for the conversion from LDF file to configuration file code, will depend on the size of the file.

      If there are considerable numbers of Tx and Rx messages for configuration, we will prefer to use our proprietary PC based auto-code generator tool.

      Ans. The PC-based tool runs on Windows OS and has been developed by our automotive team. It reads the LDF file and converts it into configuration files instantly.

      Our in-house LDF to auto code generation tool has the following benefits:

      • Designed for generating MISRA C compliant configuration files.
      • Code generation is much faster than the manual method (Manual Method takes 2-3 weeks depending on LDF file size).
      • It not only saves the time but also cuts down the cost.
      Ans. Our LIN stack is light-weight in size. The size of flash memory is 6 kB and RAM size is 1 kB. The RAM size could go higher depending on the size of the configuration file.
      Ans. Yes, Our LIN stack is completely modular. There are no global variables exchange between the programs files and every functionality is invoked with the help of specific APIs.

      Modularity makes the LIN stack light-weight and also easy to deploy in number of production programs, without any compatibility issue.

      Ans. We offer separate stack solutions for both LIN Master and LIN slave. As LIN is not a broadcast protocol, the LIN master is tasked to initiate the command and the slave has to act on it.

      Depending on the project specifications, we will deliver LIN master, LIN slave or both.

      Ans. Yes, High-Level Design Document and Low-Level Design Document, will be a part of the LIN stack package. In addition to that, we will also provide Functional Test Plan & Report and MISRA compliance Report.

      These documents contain every detail you may need to make some enhancements to the stacks or to integrate the stack solution in multiple production projects.

     

    Knowledge Bytes
      What is a LIN stack?

      LIN is a sub-network deployed in both passenger and off-road vehicles. Unlike CAN, which is a broadcast protocol, LIN is a master/slave communication standard.

      Simpler functionalities like wiper, mirror control and washer etc. are usually handled by LIN network.

      The LIN master ECU is integrated with the body control module, from where it initiates the command. The LIN master nodes will receive the command over LIN network and act accordingly.

      LIN Slave nodes don’t communicate with other networks, unless initiated by the LIN master.

      What makes LIN important when CAN already handles in-vehicle networking?

      Adding too many nodes (ECUs) to the network causes Network BUS slow down. To prevent this, a sub-network is designed. The body control module usually acts as a gateway between the main network and the subnets.

      LIN is a single wire network best suited for small applications like wiper and washer etc. Using CAN for such application lead to increase in the software and hardware cost.

    Case Studies

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