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Re: Make LTSpice report an error

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On 31/03/2017 2:53 PM, rickman wrote:
> On 3/30/2017 9:09 PM, Sylvia Else wrote:
>> I'd like a way to make LTSpice report an error if one of my sub-circuits
>> detects an invalid condition. For example, I often simulate a PIC by
>> representing it as a sub-circuit that applies signals to its pins in
>> accordance with the way I intend to program it. I'd like that
>> sub-circuit to check, for example, that it has the correct voltage on
>> its power and ground pins, and flag an error if not.
>>
>> Anyone have a way of doing that?
>
> LTspice will report the results of measurements which can contain
> calculations.  If you have a value called "VoltageTooLow" and calculate
> it by dividing by a value which would be exactly zero when your error
> condition occurs, rather than reporting a number it will flag the
> error... I think.  I know I had what look like error reports when my
> measure statements were not able to be executed.
>
> Otherwise you can create a signal that makes an extreme change in
> voltage when the error condition occurs and monitor it on the waveform
> display.  Switches are useful for bounds checking.
>
I had thought of division by zero. It doesn't work. Nor does sqrt(-1). 
Having a signal whose voltage indicates an error is less effective 
because it requires one to remember to check it.

Sylvia.

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Thread

Make LTSpice report an error Sylvia Else <sylvia@not.at.this.address> - 2017-03-31 12:09 +1100
  Re: Make LTSpice report an error rickman <gnuarm@gmail.com> - 2017-03-30 23:53 -0400
    Re: Make LTSpice report an error Sylvia Else <sylvia@not.at.this.address> - 2017-03-31 17:32 +1100
      Re: Make LTSpice report an error rickman <gnuarm@gmail.com> - 2017-03-31 06:08 -0400
  Re: Make LTSpice report an error Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-03-31 09:34 -0700

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