AVRISP-II and AVRDUDE
- MikeB
- 9x Developer
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AVRISP-II and AVRDUDE
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.
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.
ersky9x/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
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
- MikeB
- 9x Developer
- Posts: 15452
- Joined: Tue Dec 27, 2011 1:24 pm
- Country: -
- Location: Poole, Dorset, UK
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
ersky9x/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?
- MikeB
- 9x Developer
- Posts: 15452
- Joined: Tue Dec 27, 2011 1:24 pm
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- Location: Poole, Dorset, UK
Re: AVRISP-II and AVRDUDE
No, MISO is data from the AVR processor to the programmer (Master In Slave Out).
Mike
Mike
ersky9x/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
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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- Joined: Tue Dec 27, 2011 1:24 pm
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- Location: Poole, Dorset, UK
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
ersky9x/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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