Retrieving sysVar BusLoad for CAN channel adaptively

Question

I am creating a program node for a test. The test requires knowledge of the bus load of the CAN channel being tested. The test is nearly fully autonomous except for retrieving the sysVar Busload for the respective channel. I want to make it so that I can retrieve the BusLoad value like this:

Proper way:

on message *{
      BusLoad = @_Statistics::CAN1::Busload;
}

What I want:

on message *{
      BusLoad = @_Statistics::this.msgChannel::Busload;
}

I am extremely new to CAPL so any help would be appreciated, I'm unsure if this is even possible.

Thank you! :)

Answer 1

You can access system variables by name.

Try this (could not test this, I am currently away from my CANoe):

on message * {
  char buffer[100], format[] = "CAN%d::Busload";

  snprintf(buffer, elcount(buffer), format, this.CAN);
  BusLoad = sysGetVariableInt("_Statistics", buffer);
}

sysGetVariableInt allows to specify the name of the system variable as string. With snprintf you can assemble the string using the channel number.