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

I am new to the sx.  Just last night I was brain storming how to accomplish this.   I haven't learned sx/b yet so my solution is entierly asmbly, but it might point you in the a helpful direction.  I slapped some code together really quickly.   My test seem to indicate that 24bit color is probably a bit much.   running at 50mhz I had to update my duty cycle every 75 clock cycles to get rid of flicker.     

Here is a simple irq routine that will run a single rgb led with 256x3 resolution.



[code]org $0
interrupt
	bank $10

	incsz dutyt
	jmp red			;if cycle not over test rgb timmers
	incsz dtime
	setb moveon           ;just a delay pointer for my latter doing color sweeps
	setb ledred		;reset rgb pins assume not equal zero
	setb ledblue
	setb ledgreen
red
	jnb ledred, blue	;move on if already off
	csne redt, dutyt	;is this the end of on cycle
	clrb ledred 		; if yes, turn off red led
blue				
	jnb ledblue, green	
	csne bluet, dutyt	
	clrb ledblue		
green
	jnb ledgreen, endirq	
	csne greent, dutyt	
	clrb ledgreen
endirq
	mov w, #-75	
	retiw[/code]

I've included a little demo program that cycles through some colors.  I'm not sure this will help you with your led matrix isssue.   It will probably work better if you pick a smaller resolution.

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