AVR-Chat

Maybe this will help. It's a routine that reads all four directions 
of the Joystick. Only set-up is writing 255 to the ports first.

;----------------<SNIP>----------------------------------------

 		OUT	PORTB,FF
		OUT	PORTE,FF
	    
;--------------------------------------------------------------;
; CRICKET: BOOT SENSORY LOOP: CHECK JOYSTICK & UART THEN SLEEP ;
;--------------------------------------------------------------;
            STS     TCCR1B,FIVE  ;PRESCALE /1024
            STS     TCNT1L,ZERO  ;START AT ZERO
            STS     TCNT1H,ZERO
BOOT_LOOP:  CLR     TMP
            SBIS    PINB,6       ;JOYSTICK UP
	     RJMP   START_8MHZ    	
            SBIS    PINB,7       ;JOYSTICK DOWN
             RJMP   START_2MHZ            
            SBIS    PINE,2       ;JOYSTICK LEFT
             RJMP   START_4MHZ
            SBIS    PINE,3       ;JOYSTICK RIGHT
             RJMP   START_1MHZ	

            LDS     TMP,TCNT1L   ;CHECK CLOCK
            LDS     TMP,TCNT1H
            CPI     TMP,255
             BREQ   GO_SLEEP

  	    LDS	    TMP1,UCSR0A	 ;CHECK UART
            SBRS    TMP1,RXC
             RJMP   BOOT_LOOP    ;NO UART THEN LOOP

;-------------------------------------------------------

--- 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
> >
>