SM_fast

MIDIbox HUIs
1

I’m studying the application SM_fast ( asm version) and I have some question on it, just for tryin’ to understand the way it work.

1)I’m searching where I can change the “scanning speed” of the keyboard: I think it is on  main.asm here:

movlw  10000 & 0xff	
	movwf  MIOS_PARAMETER1	
	movlw  10000 >> 8	
	movwf  MIOS_PARAMETER2
  movlw	0x00
	call	MIOS_TIMER_Init

	call	SM_Init

	movlw  0x00
        movwf  SM_CH_STATUS

  movlw	0
  call	MIOS_AIN_NumberSet
  call	MIOS_AIN_UnMuxed
  movlw	4;7
  call	MIOS_AIN_DeadbandSet

it is right? If no where it is ?

2)What’s the difference in Sm-Fast and Sm_slow in performance? What’s the difference in managing the scan matrix?

Thank you for your help!

Anakin

2

1)I’m searching where I can change the “scanning speed” of the keyboard

It cannot be changed, as sm_fast scans the keyboard “so fast as possible” in an endless loop.

If you prefer a defined scan period, use sm_slow.

On the other hand - why do you want to change the speed?

I think it is on  main.asm here:

No, the timer is only used to decrement the debounce counters.

2)What’s the difference in Sm-Fast and Sm_slow in performance? What’s the difference in managing the scan matrix?

sm_slow uses the common MIOS hooks to scan a matrix and can be used in parallel to other routines w/o drawbacks. E.g., I’m using the same approach for MBSEQ, MBSID, MBFM - and these are really CPU intensive applications.

sm_fast is a hack which controls the SRIO chain directly so fast as possible. This should be done exclusively. No other routines should run in parallel.

Best Regards, Thorsten.

3

Hi Tk and thank you :slight_smile:

It’s not a matter of changing the speed ( it is just as fast!) it is only for try to understand how it work as I’m bit new to asm.

So, what does the code I posted stands for? I can’t understand the reason of it and what does it mean.

Ok , it is for the debounce counters but I don’t know how it means, maybe it’s better to search at google and then return here!

For the difference between sm_fast and sm_slow thank you very much I understand ( so for example if I add a pot in a free ain port, it will stop the scanning of the matrix , right?)

thanks!

Anakin