I use an AVRISP-II programmer for flashing Atmel AVR processors, but I couldn't use it with eepe as Atmel Studio 6.0 loads its own drivers that don't work with AVRDUDE.
I just found this site however:
http://www.visualmicro.com/post/2014/01 ... duino.aspx
and, having followed the instructions, I now have the AVRISP-II working with AVRDUDE and eepe.
There is one other problem with using the AVRISP-II, the same problem I have with my STK500. The signal drivers cannot cope with the capacitors that load the reset and signal lines. I solved this for the STK500 by buffering the programmer output signals with some 74AC devices. These provide plenty of drive and I use this with both the STK500 and the AVRISP-II.
Mike.
AVRISP-II and AVRDUDE
- MikeB
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AVRISP-II and AVRDUDE
erskyTx/er9x developer
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The difficult we do immediately,
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Re: AVRISP-II and AVRDUDE
Hi Mike, which IC have you used as buffer?
As we discussed latest days I have this same problem, and simply I whan't to know if you used buffers, or nor or nand gates, just to go directly and not to waste time.
Thanks for all of your help
As we discussed latest days I have this same problem, and simply I whan't to know if you used buffers, or nor or nand gates, just to go directly and not to waste time.
Thanks for all of your help
Trying to learn something and help the others
- MikeB
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Re: AVRISP-II and AVRDUDE
I believe I used a 74AC04 device, with the gates used in pairs to provide a non-inverting buffer on each of RESET, SCK and MOSI.
Mike
Mike
erskyTx/er9x developer
The difficult we do immediately,
The impossible takes a little longer!
The difficult we do immediately,
The impossible takes a little longer!
Re: AVRISP-II and AVRDUDE
Then i can understand that MISO is a bidirectional signal, am i right?
Trying to learn something and help the others
- MikeB
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Re: AVRISP-II and AVRDUDE
No, MISO is data from the AVR processor to the programmer (Master In Slave Out).
Mike
Mike
erskyTx/er9x developer
The difficult we do immediately,
The impossible takes a little longer!
The difficult we do immediately,
The impossible takes a little longer!
Re: AVRISP-II and AVRDUDE
Here you, and whoever have something that could help.
Thanks a lot for your help
Thanks a lot for your help
Trying to learn something and help the others
Re: AVRISP-II and AVRDUDE
Mike, wouldn't a CD4069 do the job? I think it might be easier to find and probably cheaper?
João
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- MikeB
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Re: AVRISP-II and AVRDUDE
Unlikely! The point of this buffering is to use a high current output drive, the '4069 only drives 1mA at 5V, the 74AC devices drive 24mA.
Mike
Mike
erskyTx/er9x developer
The difficult we do immediately,
The impossible takes a little longer!
The difficult we do immediately,
The impossible takes a little longer!
Re: AVRISP-II and AVRDUDE
Understood. Thanks for the explanation..
João
João
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