Macro CMPEQ?TTT not found in macro file

**Darrel Taylor** · - 13th May 2006, 19:32

In other languages such as Pascal, Logical comparisons are treated like a Mathmatical formula. Then after the formula is calculated, any non-zero number is considered TRUE. Consequently, the result of that formula can be assigned to another variable if so desired.

In PicBasic, that would require additional time, temporary variables and code space. Things that don't matter on a computer with GIGA hz, ram, and disk space. But matters alot for a PIC.

Fotunately, the same things can be accomplished in different ways. For instance...

Is_Switch_aktiv= ( Flag_Switch_activ_on_ = Switch )

can be like this...

Is_Switch_aktiv= ( Flag_Switch_activ_on_ ^/ Switch )       ; ^/ is "Not Exclusive OR"

To see how that works we can look at the Truth Tables.
<table border="0" cellspacing="7" cellpadding="4"> <tr> <td> <table CELLSPACING="0" BORDER="1" CELLPADDING="2" WIDTH="202"> <tr> <td WIDTH="99%" HEIGHT="16" colspan="3"> Equals sign</td> </tr> <tr> <td WIDTH="33%" HEIGHT="16"> A</td> <td WIDTH="33%" HEIGHT="16"> B</td> <td WIDTH="33%" HEIGHT="16"> Out</td> </tr> <tr> <td WIDTH="33%" HEIGHT="16"> 0</td> <td WIDTH="33%" HEIGHT="16"> 0</td> <td WIDTH="33%" HEIGHT="16"> 1</td> </tr> <tr> <td WIDTH="33%" HEIGHT="16"> 0</td> <td WIDTH="33%" HEIGHT="16"> 1</td> <td WIDTH="33%" HEIGHT="16"> 0</td> </tr> <tr> <td WIDTH="33%" HEIGHT="16"> 1</td> <td WIDTH="33%" HEIGHT="16"> 0</td> <td WIDTH="33%" HEIGHT="16"> 0</td> </tr> <tr> <td WIDTH="33%" HEIGHT="16"> 1</td> <td WIDTH="33%" HEIGHT="16"> 1</td> <td WIDTH="33%" HEIGHT="16"> 1</td> </tr> </table> </td> <td> <table CELLSPACING="0" BORDER="1" CELLPADDING="2" WIDTH="202"> <tr> <td WIDTH="99%" HEIGHT="16" colspan="3"> Exclusive OR  ^ </td> </tr> <tr> <td WIDTH="33%" HEIGHT="16"> A</td> <td WIDTH="33%" HEIGHT="16"> B</td> <td WIDTH="33%" HEIGHT="16"> Out</td> </tr> <tr> <td WIDTH="33%" HEIGHT="16"> 0</td> <td WIDTH="33%" HEIGHT="16"> 0</td> <td WIDTH="33%" HEIGHT="16"> 0</td> </tr> <tr> <td WIDTH="33%" HEIGHT="16"> 0</td> <td WIDTH="33%" HEIGHT="16"> 1</td> <td WIDTH="33%" HEIGHT="16"> 1</td> </tr> <tr> <td WIDTH="33%" HEIGHT="16"> 1</td> <td WIDTH="33%" HEIGHT="16"> 0</td> <td WIDTH="33%" HEIGHT="16"> 1</td> </tr> <tr> <td WIDTH="33%" HEIGHT="16"> 1</td> <td WIDTH="33%" HEIGHT="16"> 1</td> <td WIDTH="33%" HEIGHT="16"> 0</td> </tr> </table> </td> <td> <table CELLSPACING="0" BORDER="1" CELLPADDING="2" WIDTH="202"> <tr> <td WIDTH="99%" HEIGHT="16" colspan="3"> Not Exclusive OR  ^/</td> </tr> <tr> <td WIDTH="33%" HEIGHT="16"> A</td> <td WIDTH="33%" HEIGHT="16"> B</td> <td WIDTH="33%" HEIGHT="16"> Out</td> </tr> <tr> <td WIDTH="33%" HEIGHT="16"> 0</td> <td WIDTH="33%" HEIGHT="16"> 0</td> <td WIDTH="33%" HEIGHT="16"> 1</td> </tr> <tr> <td WIDTH="33%" HEIGHT="16"> 0</td> <td WIDTH="33%" HEIGHT="16"> 1</td> <td WIDTH="33%" HEIGHT="16"> 0</td> </tr> <tr> <td WIDTH="33%" HEIGHT="16"> 1</td> <td WIDTH="33%" HEIGHT="16"> 0</td> <td WIDTH="33%" HEIGHT="16"> 0</td> </tr> <tr> <td WIDTH="33%" HEIGHT="16"> 1</td> <td WIDTH="33%" HEIGHT="16"> 1</td> <td WIDTH="33%" HEIGHT="16"> 1</td> </tr> </table> </td> </tr> </table>
An Exclusive OR outputs a 1 when either of the inputs are a 1 but not both. This is the same as != in a logical expression.
Since we want "=", simply invert the XOR result with "^/".

**BigWumpus** · - 14th May 2006, 00:20

OK(8chars)

**Darrel Taylor** · - 14th May 2006, 00:36

Thread: Macro CMPEQ?TTT not found in macro file

Thread Tools

Search Thread

Display

Hybrid View

Similar Threads

Instant Interrupts - Revisited

PBPro error "Macro USBINIT? not found in macro file"

ERROR: Macro USBINIT?,USBSERVICE?,USBIN?CBBL ,USBOUT?CBBL not found in macro file.

ERROR: Macro MOD?TCB not found in macro file.

18F452 "Unknown Processor" errors

Members who have read this thread : 0

Bookmarks

Bookmarks

Posting Permissions