Re: gEDA-user: ngspice simulation with microcontrollers

[John Griessen <john@xxxxxxxxxxxxxx>]

John Doty wrote:
> On Sep 25, 2007, at 1:03 AM, Amos Tibaldi wrote:
> 
>> Hello,
>>  I write this mail in order to obtain help if possible for the use  
>> of the ngspice simulator. How can I simulate the behaviour of a  
>> microcontroller that is present in the schematic of a circuit with  
>> ngspice?
> 
> Basically, you can't.
> 
> What I do in these situations is substitute voltage sources for the  
> microcontroller output pins and generate PWL stimuli for them. Put  
> probes where the inputs would be, .PRINT those voltages, and use an  
> AWK or C program to extract bits from the recorded voltages. Of  
> course, that's a one-way data flow: if you really want the  
> microcontroller to participate, you can't do it that way. 



> Perhaps Al will chime in about gnucap: I suppose you could write some  
> sort of plugin that allows the program you'd run in the  
> microcontroller to interact in an event-driven way with an analog sim.

Wouldn't it be nice to be able to use a model of some of the micro's inouts
that is 2-way connected with a math model in Mathomatic, Octave, Mathematica?
For modeling some DSP being done with  the HW multiply in a MSP430 for instance.

John Griessen
-- 
Ecosensory   Austin TX


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