Strange problem with #DEFINE

[Gigi]

#chip 12F675,4      'Velocit� in Mhz oscillatore interno
#config INTRC_OSC_NOCLKOUT, WDT_OFF, MCLR_Off, BOD_on, PWRT_on
#option explicit 

#define Freq    70      ' regolazione ritardo VARIA FREQUENZA
#define Freq1   Freq-10     ' FREQ - 10

 Do

   wait freq uS
   nop
  Wait 2 s       'time to enjoy the result

   wait freq1 uS

 Loop

Example to understand problem

From inaccurate delay error!
Instead with; #define Freq1 60
It works perfectly

[Anobium]

Interesting. I should trap this issue, and, issue a warning.

Open up the CDF for the program.

Search for Freq1, you will find

CODE/Constant: Line 6 FREQ1 0

So, the constant is 0.

Why? #define Freq1 Freq-10 when it should be #define Freq1 = Freq-10 but that does not work either. This needs to be resolved.

Use a script as a temp fix.

#script
    FREQ = 70      ' regolazione ritardo VARIA FREQUENZA
    FREQ1 = INT(FREQ-10)
#endscript

Now I get this in the CDF.

FINAL/CONSTANT :FREQ   70
FINAL/CONSTANT :FREQ1  60

[Gigi]

How do you open CDF ?
I had searched the ASM file but couldn't find anything

[Anobium]

Open the Preferences Application, select the Compiler Tab, select and check 'Create CDF output file', select 'OK' to save.

The CDF is not created automatically.

[Anobium]

This issue is resolved in build 1432 of the compiler.

The issue was the method Hugh implemented to create the second constant and he assumed that no constant would be used in the creation of subsequent constant.

• When an = existed: This forced the removal of the = sign and evaluation of the constant string. There was no replace of existing constant(s). So, this created a constant with a string of FREQ-10
• When an = did not exist: There was no replace of existing constant(s). So, this also created a constant with a string of FREQ-10

---

Build 1432

The preprocessor now properly evaluates the constant string.
* If =exist, removes the =
* If contains "+-*\/&" then replace any constants with the existing constant string then evaluate the string,

Note: The constants are handled in-sequence. The order is strict. A constant must be defined before any calculation can use it.

This now works, as so do many other mathematical structures.

#define Freq 70
#define Freq1 = FREQ - 10

or

#define Freq 70
#define Freq1 FREQ - 10

both of the above constructs generates this ASM

;wait Freq1 uS
    movlw   20

where wait 60 us would generate

;wait 60 uS
    movlw   20

[Gigi]

OK, perfect thanks for the very quick resolution.