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Re: [avrdude-dev] Safer timing in par_txrx()?
From: |
Jan-Hinnerk Reichert |
Subject: |
Re: [avrdude-dev] Safer timing in par_txrx()? |
Date: |
Sat, 24 Jan 2004 23:21:10 +0100 |
User-agent: |
KMail/1.5.4 |
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