Re: [avrdude-dev] Safer timing in par_txrx()?

[Jan-Hinnerk Reichert]

On Saturday 24 January 2004 18:27, address@hidden wrote:
> hallo,
> mybe I can help with some messurements.
> http://hoxel.no-ip.org/pio/basteln/avr/isoprog/mess.html

Yeah, this helps ;-)

First I have to say sorry for the inverted signal-stuff I wrote. Of 
course the signal don't get inverted ;-(

The problem is indeed the timing. The measurements show an asymetric 
delay of the signal. High to low transitions are quite fast, but low 
to high is delayed by almost 2us.

You should investigate where the delay occurs. However, I'm quite sure 
that it is in the optocoupler (when light is turned off).

BTW: Do you use the latest CVS version or an older release. The 
measurements looks like it is not the CVS-version, which is much 
faster than the 4.2.0-release ;-(

/Jan-Hinnerk