Re: [avrdude-dev] alf programmer -- inverted outputs

[Jan-Hinnerk Reichert]

On Monday 23 August 2004 17:23, Roeland Moors wrote:
> I made a programmer like the schematic included in the source.
> But instead of using the 74367 I used the 74368. This means that
> the ouputs are inverted. Is it possible to define this in
> avrdude.conf?
> If not, would this be hard to program?

Hi Roeland,

right now it is not possible to define it in the config.

It should not be too hard to implement, but there are a few pitfalls 
when it comes to negated OE-lines or even VCC-lines. IMHO, it would 
be best to cleanup the related code before doing any changes. I will 
take a closer look at the problem this weekend.

QUICK FIX: If you can compile the sources, you can alter the struct 
"pins[]" in "par.c"; the last number in each line tells if a pin is 
negated. Naturally, this patched versions won't work with normal 
programmers. Additionally, you might need to specify "-E reset", if 
your reset signal becomes inverted.

Cheers
  Jan-Hinnerk