Re: [avrdude-dev] Support for at-isp v1.1?

[Neil Davey]

Hi Bram,
I use the mega control board for a few projects... to get around this 
issue I have
1) setup a bootloader for some projects
2) made a bsd style programmer that hooks into the 10pin connector
3) I currently use the AVRISP MK II and avr studio (on windows, till I 
can get the win32 libusb working...)

It would be good I think to have an option to invert the pin operation...

Regards
Neil Davey

> Hi,
>
> Recently I bought a atmega8 development board from futurlec/mrt. This
> board has it's own, yet another idea how the isp connector and
> (parallel) programming cable (labeled AT-ISP V1.1) looks like. There's
> also a windows software supplied to program the uC.
>
> All signal lines between the isp connector and atmega8 (reset, sck,
> mosi, miso) are inverted with a 74ls04.
> Since all IC components are installed in a socket, I was able to
> bypass the inverters, by inserting wires in the ic socket of the
> 74ls04 (creating a pin compatible 'passive non-inverting device' ;-)).
>
> With the following added to /etc/avrdude.conf, I was able to program
> the atmega8:
>
> programmer
>  id    = "atisp";
>  desc  = "AT-ISP V1.1 programming cable for AVR-SDK1 from
> micro-research.co.th";
>  type  = par;
>  reset = 6;
>  sck   = 8;
>  mosi  = 7;
>  miso  = 10;
> ;
>
> My questions are:
> - Is anyone using this board successfully with avrdude?
> - Would it be possible let avrdude invert the programming signals, so
> that a board like this would be directly supported?
> The avrdude.conf file might then, for example look like:
>
> programmer
>  id    = "atisp";
>  desc  = "AT-ISP V1.1 programming cable for AVR-SDK1 from
> micro-research.co.th";
>  type  = par;
>  reset = _6;
>  sck   = _8;
>  mosi  = _7;
>  miso  = _10;
> ;
>
> Using some character (_) to invert a pin.
>
> Thanks,
>
> Bram
>
>
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