I/O - From Define to code ... must be easy

[mister_e]

Oki, so here's the question assuming the following way to define Aliases to I/O

DEFINE LowBeerLevel  PORTB,1

OR

#DEFINE LowBeerLevel  PORTB,1

On ASM level.

It's still easy to use them later with MOVE?CT macro, or BSF/BCF whatever floats your boat.

What if I wanted to use it with say I2CREAD, HIGH or whatever else PBP command?

Tried few variants of EXT modifier thing.. but LOL...

Seems I'm too idiot to make it work.

I could still work on asm level... but if there's any other way, I would really like to hear them.

Thanks!

[cncmachineguy]

I think the preferred way is this:

LowBeerLevel var portb.1
GoToBeerStore var portb.2
 
while !LowBeerLevel
   :):)
while end
 
ASM
BSF _GoToBeerStore
ENDASM
 
If GoToBeerStore = 1 then
  :(

Ok, silly example, but the point is create your var's or alias as usual, then to use in ASM block stick an underscore before the name.

HTH

[mister_e]

You missed the DEFINE thing, however I came up with the following

        DEFINE  SData   PORTB,1
        DEFINE  SClock  PORTB,2

And then in the compilation time section you use

CreateVar   MACRO    PortIn,BitIn, PortOut, BitOut
PortOut = PortIn
BitOut = #V(BitIn)
        ENDM
        ;
        ;
        ;     somewhere later
        ;
@       CreateVar SData, SerData, DataBit
@       CreateVar SClock, SerClock, ClockBit
        
        SerData   VAR BYTE EXT
        DataBit   CON      EXT
        SerClock  VAR BYTE EXT
        ClockBit  CON      EXT

just need to use 'em like

HIGH SerClock.0[ClockBit]

It has some success, ugly... and we also know this method is not going to work all the time... good example? Shiftout

Keep thinking...

[mister_e]

I think of some other ways, but it's damn too much coding for a so simple thing The asm side's still good enough though. It would have been soo easy if we could do
DEFINE LCD_EN_LINE PORTC,1
and then
LCD_EN_LINE VAR BIT EXT... BUT NOPE
OR
even easier.. have them ready to use, nothing to hack...

Why I do prefer the DEFINE way... hahaha, I have no idea Probably to fit with PBP LCDOUT, HSEROUT, DEBUG etc etc etc

[Darrel Taylor]

This will blink an LED on any pin, as specified in the BLINK_TEST define.
If the define is commented out, it will bypass the blinky and start at the main program.

DEFINE BLINK_TEST PORTB,0
'
' Variables, Constants etc.
'
;----[Blinky test]------USE( DEFINE BLINK_TEST PORTB,0 )-----------------
BLINK_LED VAR BIT EXT
@ #undefine BLINK_LED
@ #define BLINK_LED BLINK_TEST
@ ifdef BLINK_TEST
    INCLUDE "AllDigital.pbp"
    Blink:
        TOGGLE BLINK_LED
        PAUSE 500
    GOTO Blink
@ endif

[mister_e]

hhhhhhhhhhhhhhhhhhhhhaaaaaa! I knew it was something "easy", just never though of the #undefine twist...mmm... something else to chew on

Thanks Mr Tech Support

[HenrikOlsson]

Hi,
So, are you saying that this is almost like conditional compilation? By almost I mean that as far as I understand it, it will alwyas compile the code but depending on if the DEFINE exists or not the compiled ASM code will or will not be assembled?

Is that correct? If not, could Steve or Darrel elaborate a bit as I'm curious?

Thanks!
/Henrik.

[mister_e]

Yup, some black magic in conditional compilation, IFDEF, IFNDEF, #DEFINE, #UNDEFINE, to name only but those. Pretty slick and so usefull once you get the concept and play with.

Lots of great feature in asm and MPASM. If you' wanted, you may have one code template and it will fit every hardware depending how you deal with the conditional compilation. Good example, Microchip Framework. One code fits all(most) of their development boards.

On the top of your code, you provide some USER configurable setting, says regular LCD or GLCD, USB to RS232, PIC model and so forth... endless possibilities.

Pretty addictive.

[Ioannis]

I smell that you are cooking something here Steve, but cannot follow you.

I'll wait to see the smartie that you will show us... anxiously

Ioannis

[mister_e]

Always looking for convenience, but don't always use it

"What you smell is a fart, not much " <-- highlight with your mouse...