Re: [Uisp-dev] Bug in uisp?

[Jason Kyle]

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.

Jason Kyle