force value 0 or 127 AIN

MIOS programming (Assembler)
1

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

2

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.
3

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

4

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.