On Fri, Jun 10, 2011 at 1:40 AM, Tomek CEDRO <tomek.ce...@gmail.com> wrote:
> Hello Andreas :-) > > On Thu, Jun 9, 2011 at 11:30 PM, Andreas Fritiofson > <andreas.fritiof...@gmail.com> wrote: > >> I have created simple quit() that sets all port pins high and as input > >> (mpsse command 0x80 0x82) but that did not shut down the yellow led > >> :-( > > > > Since the suitable setting depends on the mapping of the GPIOs and the > > surrounding electronics, the quit function would probably need to be > layout > > specific, as Laurent mentioned. > > I think setting all pint as input create Hi-Z for them, so his is the > safest choice and _should_ produce situation as if the interface was > not connected at all... unless interface use some buggy buffer > construction where high impedance would cause output to be active. I > thought that was what Laurent mentioned... it sounds sensible, but > maybe I did some error somewhere... > Setting the FTDI pins to Hi-Z is not necessarily the same as setting the pins in the JTAG connector to Hi-Z. There is arbitrary dongle-specific interface logic between the FTDI chip and the connector. /Andreas
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