LIN-Transceiver-Library (TJA1020)

Using a LIN Bus via TJA1020 Transceiver needs to handle the statemachine bevor you will be able to send or receive data from the bus. This is encapsulated within this class.

dependencies

This library extends the Lin-Interface Library: https://github.com/mestrode/Lin-Interface-Library

example

Take a look into the basic example.

Library should work like the Lin-Interface Library, but considers the statemachine in every readFrame and writeFrame method. You can also control the statemachine, eg. the default slope mode.

    #include "TJA1020.hpp"

    #define LIN_SERIAL_SPEED 19200
    #define lin_NSLP_Pin 32

    // RX and TX Pin is defined per UART_nr
    TJA1020 LinBus(2, LIN_SERIAL_SPEED, lin_NSLP_Pin); // UART_nr, Baudrate, /SLP-Pin

    void setup()
    {
        // use LowSlope mode all the time
        LinBus.Slope(LinBus.LowSlope);
    }

    uint8_t getData()
    {
        uint8_t data = 0x00;

        // Read Frame ID = 0x20
        if (LinBus.readFrame(0x20))
        {
            // Read succesfull
            data = LinBus.LinMessage[0]; // only consider byte 0 of the received data
        }

        // let LIN-Tranceiver sleep --> changes also the INH Pin of the TJA1020
        LinBus.setMode(LinBus.Sleep);

        return data;
    }

see also

• Datasheet of TJA1020 https://www.nxp.com/docs/en/data-sheet/TJA1020.pdf