Re: [Simulavr-devel] SerialRX and feedback example

[Joel Sherrill]

address@hidden wrote:
> On Tue Apr  7 18:35 , Joel Sherrill  sent:
>
>   
> > address@hidden wrote:
> >     
> > > On Tue Apr  7 16:23 , Joel Sherrill  sent:
> > >   
> > >       
> > > > By inserting debug prints, I have confirmed that
> > > > the hwuart is shifting the correct data out the
> > > > TXD pin.  The TXD pin is connected to the RX pin
> > > > of a SerialRX instance.  All data sampled at the
> > > > RX pin is 0 (BAD).  Thus all data in the feedback.tcl
> > > > display is 0.
> > > >     
> > > >         
> > > From the description, the pins are not connected.
> > > Is the connection done with a Netlist?
> > > If so, perhaps its methods deserve debugging statements.
> > >
> > >   
> > >       
> >    Net ser_rxD0
> >    SerialRx mysrx $ui "serialRx0" ".x"
> >    SerialRxBasic_SetBaudRate mysrx 9600
> >    ser_rxD0 Add [SerialRxBasic_GetPin mysrx "rx"]
> >    ser_rxD0 Add [AvrDevice_GetPin $dev1 "E1"]
> >     
>
> I can't read tcl well enough to tell.
>   
This is a rough translation to C++.  The binding is very close
once you get a handle on reading it.

ser_rxD0 = new Net()
mysrx = new SerialRx( ui, "serialRx0, ".x )
mysrx->SetBaudRate(9600)
ser_rxD0->Add( mysrx->GetPin( "rx" ) )
ser_rxD0->Add( dev1->GetPin( "E1" ) )

Where dev1 is an atmega128 instance.
> Any suggestions on how I learn to do that?
> Did K&R write a tcl book?
>
>   
I have an old Tcl book which is quite good but the online
docs are excellent.
> > I think E1 is the atmega128 TXD from reading the code.
> > And "rx" is the only pin in the SerialRx pin.
> >     
>
> More precisely, TXD0.
> An atmega128 also has TXD1.
>
>   
Right.  examples/feedback/uart.c is using UART0 so TXD0
and that seems right.
> You might want to put printf's in the Netlist methods.
>
>   
I don't see how to get info on the pin names but I did
put a print in Pin::SetInState (const Pin &p) and the
state is going H/L in what appears to be a reasonable
pattern.  SerialRx just somehow isn't seeing it. 

My net may not be 100% right but if I hook up an external
pin via Tcl, then I start seeing high/low transitions in
the simfeedback.tcl.   But SerialRx always gives 0. 
I don't want to have to reconstruct bits into bytes when
there is a class already supposed to do it.  But I can't
seem to make it work.

This is deep in the bowels and I don't know what else
to check.  The code in CVS demonstrates the problem
but doesn't have any debug prints.

:( frustrated :(
> --
> Michael Hennebry
> address@hidden
> "War is only a hobby."
> ---- Msg sent via CableONE.net MyMail - http://www.cableone.net


--
Joel Sherrill, Ph.D.             Director of Research & Development
address@hidden        On-Line Applications Research
Ask me about RTEMS: a free RTOS  Huntsville AL 35805
  Support Available             (256) 722-9985