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ScanBaudratePassive

Valid for: CANoe DE • CANoe:lite DE

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Use Case

The applied baudrate on a real network should be determined on which communication exists. In this case CANoe is a passive participant - receiver - on the network and it is connected about a Y cable to the network.

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Function Syntax

long ScanBaudratePassive( dword channel, dword messageID, double firstBaudrate, double lastBaudrate, dword timeout, dword bAcknowledge);

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Description

Baudrate scanner checks different baudrates and tries to receive a message on the channel. Function starts the scan and detects the baudrate on the given channel. Result of the function is written into the Write Window. If a wrong baudrate is present, CANoe cannot receive messages and sends an Error Frame, which can be put on the bus using the parameter bAcknowledge. Note: CAN.INI file settings for the baudrate scanner: 
[BaudrateScanner]
Dlc=8
DisplayBaudrateList=0
  • Dlc: DLC of the message sent by the scanner. Default value: 8
  • DisplayBaudrateList: If this value is set to 0 the baudrate scanner stops after finding the first baudrate. If the value is non-zero the scanner checks all baudrates and displays a list of values at the end. Default value: 0

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Parameters

  • channel: Channel number. (1,..,32)
  • messageID: ID of the message that the scanner will receive to detect the baudrate. If this value is 0xffff the scanner will receive all the messages on the channel.
  • firstBaudrate / lastBaudrate: Baudrate range to scan.
    • If both values are set to zero the scanner checks the most commonly used baudrates: 33.333, 50.0, 83.333, 100.0, 125.0, 250.0, 500.0, 1000.0 [kBaud]
    • If both values are the same but not zero the scanner multiplies the baudrate with a given factor (Value range 0.25-5.0). The factor is changed with steps of 0.25.
    • If both values are different, all possible baudrate values in the ranged are scanned. The incremental step in the range is 1.5%.
  • timeout: Period of time [ms] the scanner waits when the message is sent.
  • bAcknowledge: Acknowledge mode on (1)/off (0). If a wrong baudrate is present, CANoe cannot receive messages and sends an Error Frame, which can be put on the bus using the parameter bAcknowledge. The parameter serves for the fact that CANoe - as a passive receiver - can participate indirectly in the network communication by sending an Error Frame. The parameter does not change the acknowledge settings of the Hardware Configuration dialog. The parameter has an effect only during runtime of the function.

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Return Values

Returns 0 if the scan function was successfully started. Otherwise the return value is non-zero.

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Example

— ScanBaudrateActive