constants

Hello, I am pretty new to picbasic and have some questions which should be pretty straight forward.

I am writing a program to send data serially out using the debug command and have confirmed to be able to use 9600bps at 3.579mhz. I need to send the data in inverted form so this is the code I use to declare and invert a variable:

A4 var byte
A4=~$A4 REV 8

Is there a way to do this using constants? I have a lot of bytes I need to do this with and I don't want to manually invert them by hand because they lose their meaning to people reading the code that way.


I would like to do this for example:

A4 CON ~$A4 REV 8

The ~ inverts the bits, and the REV8 reverses it. However this does not compile. It only works when I declare it as a variable. Maybe i could use some kind of table and lookup method? Thanks!

Why not convert them manually and comment each line so u know whats going on... e.g.:

A4 CON $DA 'Inverted and Reversed $A4

wow, good idea thanks!. As all these variables will quickly eat up my ram space. I jsut wish it was easier for me to update the code later on without inversing stuff. Thansk for the quick reply!

One more question though, is it possible to make an array constant? I would like to make one with 9 byts in it. I'm not sure how to go about that. The bytes are hex.

No I dont think you can make an array constant. If you want an array you will have to use a variable like this:

label VAR BYTE[length]

Quote:

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Originally Posted by cmolson

As all these variables will quickly eat up my ram space

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Why not using the internal eeprom instead?

Code:

---

ArrayIndex var byte
ArrayData var byte

    ' PreLoad EEPROM at programming time
    ' ===================================
    '
data @0,$10,$20,$30,$40,$50
    '
    '
    ' Read data from EEPROM
    ' =====================
    '
Read ArrayIndex,ArrayData

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Usually that's what i do instead of using Array... well if the PIC have EEPROM and/or free EEPROM storage.

Good luck!