AVR-Chat

Hi Guys,

I have not worked with the butterfly myself and to make things even
worse, I dont even know what type of up it's got on it. But from the
conversation, the only thing that you might want to have a look at is
to make sure that JTAG is disabled (in the fuse bits). Otherwise, the
JTAG function overrides the normal port function.

Cheers
Hein B
Auckland
New Zealand.

--- In AVR-Chat@yahoogroups.com, "granz_consult" <granz_consult@...>
wrote:
>
> Mike,
> 
> I am also having wierdness with the Butterfly's Port E.  In trying to
> use the onboard joystick, I am showing continuous action of both left
> and right joystick (the two Port E pins).  I have been sucessful in
> reading the Port B pins (up, Down and Center), but have not been able
> to read the Port E pins at all.
> 
> I've tried writing the DDRE pins, then activating the pull-up resistor
> by writing to PortE pins and then reading from the PinE pins to test
> for left/right action, but am always showing both being true.
> 
> Have you had any answers or any sucess on your own in solving this?
> 
> Thanks,
> 
> Art
> 
> --- In AVR-Chat@yahoogroups.com, Mike Murphree <mike@> wrote:
> >
> > 
> > Ran into a weird problem this week while modifying the AVR Butterfly 
> > code for my own application.
> > On the Butterfly, the pins for Port B bits 4,6, and 7, plus Port E
bits 
> > 2 and 3 are used for the joystick.  I am using these pins for my own 
> > application and am only using the LCD driver code, the USART code,
and 
> > the oscillator calibration code out of the original application.  The 
> > weird part was that all of these pins were set to inputs and I had 
> > pullups enabled (confirmed in Studio), but both in my application and 
> > in Studio's I/O panel, these bits in Port E were being read as
zeroes.  
> > I also confirmed with a DVM that these pins were at a high level.
> > 
> > I got my project working by reassigning the pins in Port E to Port B, 
> > but I'm at a loss as to what was happening with the Port E pins.  I 
> > checked with the original source and the board worked fine then.
> > 
> > Any ideas?
> > 
> > Mike
> >
>