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Re: [avr-chat] DAPA programming cable

From: Ing. Daniel Rozsnyó
Subject: Re: [avr-chat] DAPA programming cable
Date: Tue, 16 Oct 2012 20:46:41 +0200
User-agent: Mozilla/5.0 (X11; Linux i686; rv:13.0) Gecko/20120614 Thunderbird/13.0.1

On 10/16/2012 04:38 PM, Richard Cavell wrote:
Hi, everyone.

I just want to follow up on a previous post.  I built a DAPA cable to
program AVRs, and - astonishingly - it works!  The downsides are:

3) If you choose to flip fuses so that the chip goes at, say, 10 or 20
megahertz, it will run so fast that the parallel port can't keep up with
it.  So it's only for AVRs running on the internal oscillator in slow
mode at about 1 megahertz.

Are you sure? I regularly use a parallel cable to program my devices and that never happened.

The frequency limit is exactly the opposite - if you set a high frequency on the ISP interface (being that made through any interface /usb, serial, parallel/ ), then the PROCESSOR CANT KEEP UP with the fast commands.

If you switch the fuses to xtal oscillator and the chip is not programmable, you might want to check what fuses did you set and if you have a proper crystal (and capacitors - few times somebody used nF instead of pF with the crystal and that is no go :)


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