Re: [avr-chat] ultra-cheap HVSP programmer

[Neil Davey]

Hi Nicolas,

> If I understand it correctly, since it uses PB5 as GPIO, I have to use
> the HVSP programming mode. (I'm not sure about that, but it seems it
> might be possible to program it, irreversibly, with ISP.)
>   
You can program the chip using ISP as much as you like, until you 
program the fuse to disable the reset function of PB5.
It won't act as a GPIO until you do that though.. Once you've programed 
the fuse to disable the reset function, then you will need HVSP to 
reprogram the chip (and also can reset the fuse IIRC, please correct me 
if I'm wrong)
> Browsing the internet, I found a few HVSP programmers, including a few
> do-it-yourself ones, but all of them are rather expensive and require
> big programmable chips. On the other hand, there are many ultra-cheap
> ISP programmers, including ones using only a few resistors, where the
> computer software is expected to perform all the bit-banging.
>
> I guess it should be possible to build an ultra-cheap HVSP programmer,
> using only a few off-the-shelf components, perhaps requiring an external
> power supply, and where the computer software does all the bit-banging.
> Is there any known one? Of course, I'd prefer it to work with avrdude,
> or any other free software running on linux.
>   
Is just getting an STK500 an option for you? It provides HVSP capability.

Regards
Neil

> Cheers,
>
> Nicolas Boullis
>
> PS: sorry if this message is a duplicate. I first sent it while
> unsubscribed, but did not see it reach the archive, so I thought the
> list could be subscribers-only and subscribed.
>
>
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