Pin high , Pin low

anita1984

Hello Forum , i have a motor , one of the pin ( when the pin is low the motor is on , when the pin is high the motor is off )
Is it's good to write like this :

DAT
              org                         
MotorOff  
              mov dira,Pin     
              mov outa,High    
MotorOn
              mov dira,Pin 
              mov outa,#0                 
                                                                                                                                                                                                            
Pin long|<7                           
High long $FFFFFFFF     

this will be in a code and i can call MotorOff or MotorOn , depends to my need
is this good method ?

Thank you Forum
Anita

Erik Friesen

It has to be:

or dira,Pin' this to set the pin output

or outa,Pin' this sets it high

andn outa,Pin' this sets it low

Or, Paul Baker has another way he recommends that I can't remember right off.

If you are setting these up as functions you have to have ret labels.

Andrew E Mileski

Note that you can load:

$0 through $1FF using "mov dest, #N"

$FFFFFFFF through $FFFFFE01 ($-1 through $-1FF) using "neg dest, #-N"

anita1984

Hello do you mean like this :

DAT
              org                         
MotorOff      
              or dira,Pin     
              or outa,High   

MotorOn
              or dira,Pin 
              andn outa,Pin                 
                                                                                                                    
                                                                                           
Pin long|<7                         
High long $FFFFFFFF

Thank you in advance
Anita

Mike Green

You don't need "High" in your case.

    or      dira,PinMask   ' makes the pin an output

    andn  dira,PinMask   ' makes the pin an input

    or      outa,PinMask  ' make the pin high

    andn  outa,PinMask  ' make the pin low

PinMask  long   |< Pin

If the pin number is less than 9, you can use immediate operands

    or      dira,#|< Pin   ' makes the pin an output

    andn  dira,#|< Pin   ' makes the pin an input

    or      outa,#|< Pin  ' make the pin high

    andn  outa,#|< Pin  ' make the pin low