In SX Microcontrollers, SX/B Compiler and SX-Key Tool, yllawwally wrote:

I got that one and a couple of others.  The document seems to call it pulse 3, but it seems to be on the 4th pulse when you should look for XYZ. The last pulse held high I believe, while you read the buttons.  I have the code set to light up, when I get a z, however it actually lights when I get an up.  Looking at the pdf again, I added another toggle of the select line, and left it high, however it did not seem to make a difference.  I changed the code to display the LED when the A button is held, and then also for the B button, which shows me I'm controlling the select properly.  I'm running with the internal clock set to 4MHz. It seems it must be my timing that is off,below is the code I'm trying to use now.

[code]bp0			

		pause  ;93
		setb	ra.0		;turn select off, setting voltage to 5

		pause  ;93
		clrb	ra.0		;turn select on, setting voltage to 0
		nop	;1
		nop	;1
		nop	;1

		setb	ra.0		;turn select off, setting voltage to 5
		nop	;1
		nop	;1
		nop	;1

		clrb	ra.0		;turn select on, setting voltage to 0
		nop	;1
		nop	;1
		nop	;1

		setb	ra.0		;turn select off, setting voltage to 5
		nop	;1
		nop	;1
		nop	;1


		clrb	ra.0		;turn select on, setting voltage to 0
		nop	;1
		nop	;1
		nop	;1

		setb	ra.0		;turn select off, setting voltage to 5
		nop	;1
		nop	;1
		nop	;1

		clrb	ra.0		;turn select on, setting voltage to 0
		nop	;1
		nop	;1
		nop	;1

		setb	ra.0		;turn select off, setting voltage to 5
		nop	;1
		nop	;1
		nop	;1

;------------------- should be select on data now

;		mov 	w, rb
;		mov     Joystick_Mid, w


		jnb	rb.0, light	;check first bit, which should be button z
		jmp	nolight
light:		clrb	rc.6	;turn off led
		jmp 	bp0
nolight:	setb	rc.6	;turn on led


		jmp 	bp0[/code]

---------- End of Message ----------


You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=406732#m412584

Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com

The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2009 (http://www.dotNetBB.com)