Re: [Simulavr-devel] Trigger external component on clock cycle

[Klaus Rudolph]

Hi Lars,

sorry for my late answer, I am again totally busy :-(


> I want to trigger some input (port change) each thousand clock cycles or
> so. I guess this must be possible, but my C++ knowledge tends towards
> zero, so ...


I hope that you can derive from some simple classes like the uart which 
gives you
an idea how to implement a class which simulates a synchronous triggered 
device
which has external connections. Please take a look inside this class 
first. For detailed
questions I maybe could give a more detailed information.

> If I read the examples and the source correct, I'll need to have an
> object, which I connect to the systemclock with Add (or
> AddAsyncMember?). Do I have to create a C++-Class which derives from
> SimulationMember and recompile simulavr or can this task be done also
> from a (Tcl or Python) simulation script?


You could recompile the simulator, or the library if you want the hard 
way :-)
But you also can write your own main routine and bind against the 
library which makes
much more sense.

If you have a clocked device, maybe every 1000 cycles you simple use the 
Add member
function with the given time. All async members would be accessed after 
each! step of any! core
cycle, which consumes a lot of calculation time and is not what you 
would do :-)

You have to create a own c++ class derived from SimulationMember.

It is not possible to derive a class on ITCL base, which comes not from 
design of simulavr but
of the swig wrapper. This is not really nice, but it is the price of 
using wrappers :-)

But you also can write a script which steps the engine "manually" and 
change the pin
state after 1000 steps/cycles. So you need no new class and no new main 
nor a recompile.
If this solves your problem and is fast enough you could do this in this 
way.

Have fun!

Klaus