force value 0 or 127 AIN

[dexter2010]

Hi

I'm trying to porting a MIOS application wrote in C to ASM. All work just done but i need an help on this:

In my hardware I'm using a 2 position switch on an AIN unmuxed and it is working good with C allowing it to assume only value 0 or 127.

I'm not able to translate in ASM.

My C code ( in pot section ) is:

				

                {

			// Only allow value 0 or 127

			this_value = this_value < 63 ? 0 : 127;


			// If valid, send CC out

			MIOS_MIDI_TxBufferPut(0xb0);

			MIOS_MIDI_TxBufferPut(53);

			MIOS_MIDI_TxBufferPut(this_value);

		}

Any help to make the same thing in ASM under the section USER_AIN_NotifyChange?

In this moment I'm using the mios_table.inc for specify the midimessages of the pots.

thank you very much.

Dexter

[TK.]

Hi,

considered that bit #6 will be set on values >= 64, you could write:

	movlw	0xb0

	call	MIOS_MIDI_TxBufferPut

	movlw	0x53

	call	MIOS_MIDI_TxBufferPut

	movlw	127

	btfss	this_value, 6	; bit 6 is set on values >= 64

	movlw	0

	call	MIOS_MIDI_TxBufferPut

[/code]


Btw.: you split the range between 0..62 and 63..127, but it's better to split it at 64, since it's exactly the half of the value range.


Best Regards, Thorsten.

[dexter2010]

Hi Tk and thank you for your suggestion.

Is not possible for me to compile with the code you gave me because MPLAB return to me with this error:

MAIN.ASM 289 : Symbol not previously defined (this_value)

something like the "this_value" not recognize...

This is the entire code ( related to pot section)

USER_AIN_NotifyChange


        JUMPTABLE_2BYTES 2        ; (2 entries because in this trying we use only 2 unmuxed AIN)

        rgoto        Function_for_WREG_00 ; AIN 0

        rgoto        Function_for_WREG_01 ; AIN 1

    rgoto AIN_END        

    rgoto AIN_END       

    rgoto AIN_END;

    rgoto AIN_END;

    rgoto AIN_END

    rgoto AIN_END

;;;;;;;;;;;;**************************************

;

;;;;;;;;;;;;**************************************

Function_for_WREG_00		; 0-127_AIN 0


    movlw   0xb0

    call    MIOS_MIDI_TxBufferPut

    movlw   0x53

    call    MIOS_MIDI_TxBufferPut

    movlw   127

    btfss   this_value, 6   ; bit 6 is set on values >= 64

    movlw   0

    call    MIOS_MIDI_TxBufferPut


Function_for_WREG_01		; 0-127_AIN 1


    movlw   0xb0

    call    MIOS_MIDI_TxBufferPut

    movlw   0x54

    call    MIOS_MIDI_TxBufferPut

    movlw   127

    btfss   this_value, 6   ; bit 6 is set on values >= 64

    movlw   0

    call    MIOS_MIDI_TxBufferPut



AIN_END

I can't understand where's the error...

Thank you very much!

Bye

Dexter

[nILS]

MAIN.ASM 289 : Symbol not previously defined (this_value)

something like the "this_value" not recognize...

I can't understand where's the error...

The assembler tells you exactly what the problem is: It doesn't know what "this_value" is supposed to be, as it's not defined anywhere (in the C code it must be defined somewhere). Instead of "this_value" you have to use the address(es) where the AIN values are stored.