Re: [avrdude-dev] attiny10 with ftdi and bitbang

[Darell Tan]

Hi Matt,

avrdude uses regular serial ports for bitbang programmers. The FTDI
chips appear as a virtual serial port, so they have to play by the
rules. The receive pin is used to receive, therefore it doesn't make
sense for a program to be able to control this line for output.

However, FTDIs also have another GPIO-like mode, in which all (?) pins
can be used for general purpose I/O. When used in this mode, the
serial port restrictions don't apply because they aren't serial ports
any more. This is what the "avrftdi" programmer uses, though TPI isn't
implemented there, and I think FT232R's are not supported. I may be
wrong about this though.

Well at least you got it to work :) If you want the convenience,
you'll have to use an FTDI breakout board instead.

--
Regards,
Darell Tan


On Tue, Jul 3, 2012 at 1:06 AM, matthew venn <address@hidden> wrote:
> Dan,
>
> sorry I should have made that clear. I'm using the ftdi cable (5v version)
> and I'm doing the reset by hand. Tying it low then trying to program. Though
> I don't know why avrdude can't do it.
>
> I used libusb to write a test program to test all the pins of the ftdi
> cable, and can use all the 4 pins as outputs (didn't test inputs). However,
> avrdude can't seem to make full use of all the pins so I skipped reset as I
> can do this easily myself.
>
> Cheers,
> Matt
>
> --
> Matthew Venn
> mattvenn.net