Hi Harold,

Could you explain your hw design? How it powered for example?
Can you see the data bits from the FT chip with an oscilloscope?
I know it sounds stupid, but is the internal pull-up enabled for portb?

As you use C I am not sure if there is anything about watching files or
doing something with tris by the debugger as you do it upfront receiving
chars.

Tamas



On Jan 11, 2008 12:35 PM, Spehro Pefhany <speff@interlog.com> wrote:

> At 03:06 PM 1/10/2008, you wrote:
> >I've got a relatively complex program running on a 24HJ256GP610. I'm
> using
> >an FT245R for USB interface. This chip has a parallel interface to the
> >PIC. For debug, I made a small loop that reads data from the FT245R and
> >sends it back. Prior to the read, I sent a string to the chip. The string
> >write works properly, but the read always reads a null byte. However, if
> I
> >run the code in debug with the ICD-2, it works fine! I am not changing
> >optimization or anything. Just debug or program. The rest of the code
> >works fine. It's just this reading from the FT245R that does not work.
> >
> >So... what is different between running something under debug?
> >
> >THANKS!
> >
> >Harold
>
> Check your initialization. Debug does some things with TRIS registers,
> which don't happen without debug.
>
> >Best regards,
>
> Spehro Pefhany --"it's the network..."            "The Journey is the
> reward"
> speff@interlog.com             Info for manufacturers:
> http://www.trexon.com
> Embedded software/hardware/analog  Info for designers:
> http://www.speff.com
>
>
>
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