CAPLfunctionLINSendBitStream

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CAPL Functions » LIN » linSendBitStream

linSendBitStream

Valid for: CANoe DE

Function Syntax

long linSendBitStream(byte bitStream[], long numberOfBits); // form 1
long linSendBitStream(byte bitStream[], long numberOfBits, long timeoutPrevention); // form 2

Description

Sends an arbitrary bitstream on the LIN bus.

Parameters

• bitStream: The bitstream to be sent. Maximum number of bits: 2^31-1.
• numberOfBits: The number of bits in the bitStream-array.
• timeoutPrevention:
  • 0: deactivates the timeout prevention for the 7259-transceiver.
  • 1: activates the timeout prevention for the 7259-transceiver.

Return Values

On success a value unequal to zero, otherwise zero.

Example

This function sends LIN header as a bitstream

int SendSpecialHeader(int breakLength, int delimiterLength, byte syncByte, byte idByte)
{
    byte data[25];
    int headerLength;
    int currentPosition;
    int i;
    // Header consists of Break, Sync and PID bytes
    headerLength = breakLength + delimiterLength + 20;
    if (headerLength > 200)
    {
        return 0; // maximum is exceeded
    }
    currentPosition = 0;
    for (i = 0; i < 25; ++i)
    {
        data[i] = 0xff; // initialize 
    }
    for (i = breakLength; i > 0;) // set sync break
    {
        if (i >= 8)
        {
            data[currentPosition >> 3] = 0;
            i -= 8;
            currentPosition += 8;
        }
        else
        {
            data[currentPosition >> 3] &= ~(1 << (currentPosition & 0x7));
            --i;
            ++currentPosition;
        }
    }
    currentPosition += delimiterLength; // set synch delimiter
    // set sync byte
    data[currentPosition >> 3] &= ~(1 << (currentPosition & 0x7)); // start bit
    ++currentPosition;
    for (i = 0; i < 8; ++i)
    {
        if ((syncByte & (1 << i)) == 0) // dominant bit in syncByte
        {
            data[currentPosition >> 3] &= ~(1 << (currentPosition & 0x7));
        }
        ++currentPosition;
    }
    ++currentPosition; // set recessive stop bit
    // set protected id
    data[currentPosition >> 3] &= ~(1 << (currentPosition & 0x7)); // start bit
    ++currentPosition;
    for (i = 0; i < 8; ++i)
    {
        if ((idByte & (1 << i)) == 0) // dominant bit in idByte
        {
            data[currentPosition >> 3] &= ~(1 << (currentPosition & 0x7));
        }
        ++currentPosition;
    }
    ++currentPosition; // set recessive stop bit
    linSendBitStream(data, headerLength); // send created header
    return headerLength;
}