Re: [avr-gcc-list] Stuckness with ATTiny15 program and avr-gcc

[Ned Konz]

On Jan 8, 2005, at 3:25 PM, Bob Paddock wrote:

> > Did he say why he was encouraging you to keep it as a reset line?
>
> Some of the parts in this class, especially the early engineering 
> samples,
> once the rest line was programmed to be some other function you could 
> no
> longer program the part, because reset is used as part of the program
> algorithm.

The way it works (at least according to the data sheet and the 
programmer S/W) is that you can't reprogram the part *using SPI* 
(low-voltage serial). But you can do so using the HV serial (which the 
STK500, for instance, also does).

So I set my circuit up so that it can handle the 12V on the RESET pin 
for HV programming. I've had no problem reprogramming it.

> See if you can get your part to reprogram into a simple LED blinker on 
> some
> other pin to determine if this is really the case for you.

I've successfully driven the LED on the RESET line from earlier 
versions of the program. Unfortunately, the earlier versions had other 
problems. But I will do a sanity check with a simpler program driving 
the LED on the RESET line again, or something driving another pin.

Thanks,
Ned