Re: [Uisp-dev] Bug in uisp?

[Theodore A. Roth]

On Tue, 2 Mar 2004, Jason Kyle wrote:

> At 08:51 29/02/2004 +0100, Joakim Arfvidsson wrote:
> >I'm using uisp (version 20030618) with Mac OS X 10.3.2 and an Aten 
> >USB-serial converter. I do not know the chipset of that converter. I have 
> >a home-made AVR910 programmer connected to the serial port.
> >
> >The problem I'm having is that I need to pull and reconnect the USB-serial 
> >converter to the mac between almost every transfer! Sometimes it works for 
> >several transfers. Even a small chat with the programmer getting the list 
> >of programmable chips counts in this respect.
> >
> >The error message is "Programmer not responding". I can always do echo
> 
> All USB-Serial adapters won't send received serial data back to the host 
> for some period of ms (minimum is 1ms, some are as high as 16ms), or when 
> the FIFO buffer is full.  What this means for AVR910 programmers is the 
> response characters are often delayed and uisp may have some fixed timimg 
> parameters which only work properly with real UARTs.  Probably something 
> that could be tweeked.
> 
> Try a different USB-Serial adapter and/or check carefully that the "send 
> not-full FIFO delay" is as short as possible.  Failing that switch to an 
> STK500 compatiable programmer.

Thanks Jason. My USB experience is essentially nil so this would have never 
occured to me as being the problem.

I wonder if this could be handled by adding an option to allow the user to 
set the timeout to a longer value.

Ted Roth