On Thursday 14 February 2008, Robert Butts wrote: > I am simulating a circuit that has an LM741 and I'm getting a > segmentation fault. I suspect the problem may be because the > symbol I'm using for the LM741 has two pin error. The > symbol's pin attributes areIt so happens that these two pins > are the two offset null pins. I don't see these pins in the > symbol. See an excerpt of the netlist below and the gnetlist > cammand output below that: ...................... > .SUBCKT LM741 1 2 99 50 28 .................. > X2 ecuMic 1 -Vcc LM741 .......................... > X1 bottomLeg topLeg -Vcc LM741
> Is this the cause of the segmentation fault? If so, there is > no pin 1 or 5 in the symbol. How can I correct it? It doesn't segfault for me. As you figured out, the problem is that the .subckt wants 5 connections and only gets 3 connections. In 0.35, it works as designed which is to float the extra connections. It should give a warning or error message, but doesn't. The snapshot gives an error message and stops, as designed. Apparently, the pin mapping on the op-amp symbol does not match the .subckt. There is no standard for that, so all I can think of is that you need to manually edit the netlist to fix it. In my experience, the netlist generated by gnetlist usually needs manual editing to work. _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
