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Header file v. compiled code

 
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johngriswold



Joined: 04 Apr 2018
Posts: 13

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Header file v. compiled code
PostPosted: Fri Apr 20, 2018 12:47 pm     Reply with quote

I have a sample program I built using the Project Wizard - it's the LED blinking example. Mostly it works, so I use it as a baseline - add stuff until it breaks, then I know the last thing I added is broken.

In the header file I have #if 0 / #else / #endif enclosing IDENTICAL statements. If I change that to #if 1 (thus bringing to bear the same header statements, the program compiles differently.

Header File:
Code:

#if 1

#include <16LF15313.h>
#device ADC=10
//#use delay(internal=8000000)
#use delay(crystal=20000000)
#define LED PIN_A5
#define XXX PIN_A7
#define DELAY 100

#else

#include <16LF1513.h>
#device ADC=10
//#use delay(internal=8000000)
#use delay(crystal=20000000)
#define LED PIN_A5
#define XXX PIN_A7
#define DELAY 100

#endif


Listing with 0:
Code:

CCS PCM C Compiler, Version 5.077, 39075               20-Apr-18 14:29

               Filename:   C:\Source\MICROS-2122\ApicTest\led2.lst

               ROM used:   51 words (2%)
                           Largest free fragment is 1997
               RAM used:   5 (2%) at main() level
                           17 (7%) worst case
               Stack used: 0 locations
               Stack size: 16

*
0000:  MOVLP  00
0001:  GOTO   018
0002:  NOP
.................... #include <led2.h>
.................... #if 1
.................... 
.................... #include <16LF15313.h>
.................... //////////// Standard Header file for the PIC16LF15313 device ////////////////
.................... ///////////////////////////////////////////////////////////////////////////
.................... ////        (C) Copyright 1996, 2014 Custom Computer Services          ////
.................... //// This source code may only be used by licensed users of the CCS C  ////
.................... //// compiler.  This source code may only be distributed to other      ////
.................... //// licensed users of the CCS C compiler.  No other use, reproduction ////
.................... //// or distribution is permitted without written permission.          ////
.................... //// Derivative programs created using this software in object code    ////
.................... //// form are not restricted in any way.                               ////
.................... ///////////////////////////////////////////////////////////////////////////
.................... #device PIC16LF15313
.................... 
.................... #list
.................... 
.................... #device ADC=10
.................... //#use delay(internal=8000000)
.................... #use delay(crystal=20000000)
0003:  MOVLW  20
0004:  MOVWF  05
0005:  MOVLW  01
0006:  MOVWF  04
0007:  MOVF   00,W
0008:  BTFSC  03.2
0009:  GOTO   017
000A:  MOVLW  06
000B:  MOVWF  78
000C:  CLRF   77
000D:  DECFSZ 77,F
000E:  GOTO   00D
000F:  DECFSZ 78,F
0010:  GOTO   00C
0011:  MOVLW  7B
0012:  MOVWF  77
0013:  DECFSZ 77,F
0014:  GOTO   013
0015:  DECFSZ 00,F
0016:  GOTO   00A
0017:  RETURN
.................... #define LED PIN_A5
.................... #define XXX PIN_A7
.................... #define DELAY 100
.................... 
.................... #else
.................... 
.................... #include <16LF1513.h>
.................... #device ADC=10
.................... //#use delay(internal=8000000)
.................... #use delay(crystal=20000000)
.................... #define LED PIN_A5
.................... #define XXX PIN_A7
.................... #define DELAY 100
.................... 
.................... #endif
.................... 
.................... 
.................... 
.................... 
.................... //#use rs232(UART1, stream=STREAM_UART_UART1, noinit)
.................... 
.................... void main()
0018:  MOVLB  11
0019:  CLRF   12
001A:  CLRF   0F
001B:  CLRF   11
001C:  CLRF   13
001D:  MOVLW  70
001E:  MOVWF  0D
001F:  MOVLB  3E
0020:  CLRF   38
0021:  MOVLB  13
0022:  CLRF   11
0023:  CLRF   12
0024:  CLRF   13
0025:  CLRF   10
.................... {
.................... //  setup_uart(9600, STREAM_UART_UART1);
....................   
.................... 
.................... 
....................   while(TRUE)
....................   {
.................... 
....................     //Example blinking LED program
....................     output_low(LED);
0026:  MOVLB  00
0027:  BCF    12.5
0028:  BCF    18.5
....................     delay_ms(DELAY);
0029:  MOVLW  64
002A:  MOVWF  21
002B:  CALL   003
....................     output_high(LED);
002C:  BCF    12.5
002D:  BSF    18.5
....................     delay_ms(DELAY);
002E:  MOVLW  64
002F:  MOVWF  21
0030:  CALL   003
0031:  GOTO   027
.................... 
....................     //TODO: User Code
....................   }
.................... 
.................... }
0032:  SLEEP

Configuration Fuses:
   Word  1: 3FFA   HS RSTOSC_EXT NOCLKOUT CKS FCMEN
   Word  2: 3FFD   MCLR PUT NOLPBOR BROWNOUT BORV24 ZCDDIS PPS1WAY STVREN NODEBUG
   Word  3: 3F9F   WDTSW NOWDT WDTWIN_SW WDTCLK_SW
   Word  4: 1FFF   BBSIZ512 NOBOOTBLOCK NOSAF NOWRT NOWRTB NOWRTC NOWRTSAF NOLVP
   Word  5: 3FFF   NOPROTECT


Listing with 1:
Code:

CCS PCM C Compiler, Version 5.077, 39075               20-Apr-18 14:05

               Filename:   C:\Source\MICROS-2122\ApicTest\led2.lst

               ROM used:   47 words (1%)
                           Largest free fragment is 2048
               RAM used:   5 (2%) at main() level
                           17 (7%) worst case
               Stack used: 0 locations
               Stack size: 16

*
0000:  MOVLP  00
0001:  GOTO   018
0002:  NOP
.................... #include <led2.h>
.................... #if 0
.................... 
.................... #include <16LF15313.h>
.................... #device ADC=10
.................... //#use delay(internal=8000000)
.................... #use delay(crystal=20000000)
.................... #define LED PIN_A5
.................... #define XXX PIN_A7
.................... #define DELAY 100
.................... 
.................... #else   //  0
.................... 
.................... #include <16LF1513.h>
.................... //////////// Standard Header file for the PIC16LF1513 device ////////////////
.................... ///////////////////////////////////////////////////////////////////////////
.................... ////        (C) Copyright 1996, 2014 Custom Computer Services          ////
.................... //// This source code may only be used by licensed users of the CCS C  ////
.................... //// compiler.  This source code may only be distributed to other      ////
.................... //// licensed users of the CCS C compiler.  No other use, reproduction ////
.................... //// or distribution is permitted without written permission.          ////
.................... //// Derivative programs created using this software in object code    ////
.................... //// form are not restricted in any way.                               ////
.................... ///////////////////////////////////////////////////////////////////////////
.................... #device PIC16LF1513
.................... 
.................... #list
.................... 
.................... #device ADC=10
.................... //#use delay(internal=8000000)
.................... #use delay(crystal=20000000)
0003:  MOVLW  20
0004:  MOVWF  05
0005:  MOVLW  01
0006:  MOVWF  04
0007:  MOVF   00,W
0008:  BTFSC  03.2
0009:  GOTO   017
000A:  MOVLW  06
000B:  MOVWF  78
000C:  CLRF   77
000D:  DECFSZ 77,F
000E:  GOTO   00D
000F:  DECFSZ 78,F
0010:  GOTO   00C
0011:  MOVLW  7B
0012:  MOVWF  77
0013:  DECFSZ 77,F
0014:  GOTO   013
0015:  DECFSZ 00,F
0016:  GOTO   00A
0017:  RETURN
.................... #define LED PIN_A5
.................... #define XXX PIN_A7
.................... #define DELAY 100
.................... 
.................... #endif  //  0
.................... 
.................... 
.................... 
.................... //#use rs232(UART1, stream=STREAM_UART_UART1, noinit)
.................... 
.................... void main()
0018:  MOVLB  03
0019:  CLRF   0C
001A:  CLRF   0D
001B:  CLRF   0E
.................... {
.................... //  setup_uart(9600, STREAM_UART_UART1);
....................   
.................... 
.................... 
....................   while(TRUE)
....................   {
.................... 
....................     //Example blinking LED program
....................     output_low(LED);
001C:  MOVLB  01
001D:  BCF    0C.5
001E:  MOVLB  02
001F:  BCF    0C.5
....................     delay_ms(DELAY);
0020:  MOVLW  64
0021:  MOVLB  00
0022:  MOVWF  21
0023:  CALL   003
....................     output_high(LED);
0024:  MOVLB  01
0025:  BCF    0C.5
0026:  MOVLB  02
0027:  BSF    0C.5
....................     delay_ms(DELAY);
0028:  MOVLW  64
0029:  MOVLB  00
002A:  MOVWF  21
002B:  CALL   003
002C:  MOVLB  03
002D:  GOTO   01C
.................... 
....................     //TODO: User Code
....................   }
.................... 
.................... }
002E:  SLEEP

Configuration Fuses:
   Word  1: 3FC2   HS NOWDT PUT MCLR NOPROTECT BROWNOUT NOCLKOUT IESO FCMEN
   Word  2: 1FFF   NOWRT NOVCAP STVREN BORV19 NOLPBOR NODEBUG NOLVP


Note that the code following main() differs greatly between the two cases.

Note, too, that the fuse map is completely different for each of the cases.

I feel that I don't have a clear grasp of this compiler suite. Is this a bug? Is it me?

Just to add some spice to it, I saved off a copy of the .h file that was causing trouble. I copied the second set of directives, and pasted it over the first, so I KNOW I have identical information.

With the new file, it compiles and generates code OK for both choices. Oh, there must have been an errant character in the first file, right? Nope. WinMerge shows them as identical.

This is really hurting my brain on a Friday afternoon.

Can anybody shed light on this?
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John Griswold KK1X
High Tech Migrant Worker
PCM programmer



Joined: 06 Sep 2003
Posts: 20385

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PostPosted: Fri Apr 20, 2018 12:56 pm     Reply with quote

They're not identical. You have two different PICs specified.

1. 16LF15313

2. 16LF1513
johngriswold



Joined: 04 Apr 2018
Posts: 13

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PostPosted: Fri Apr 20, 2018 1:22 pm     Reply with quote

To add additional spice, I can't reproduce the problem any more, so the problem is likely some failure on my part to do operations in the proper order.

Does anybody have a particular "dance" that assures proper compilation and programming, i.e. always do a clean and a build v. using the rebuild button, or anything like that?

Thanks
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John Griswold KK1X
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temtronic



Joined: 01 Jul 2010
Posts: 6251
Location: Greensville,Ontario

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PostPosted: Fri Apr 20, 2018 1:35 pm     Reply with quote

gee I use CCS 'through' MPLAB 8v86, I always press F10 to compile

course I'm still confused about HOW the compiler understands your

If 1......
else....

code

Where's the '1' supposed to be IFted to ?

Heck I STILL have SNOW here, on the ground, so I'm not thinking clearly..did get a hotbed in today.

Jay
PCM programmer



Joined: 06 Sep 2003
Posts: 20385

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PostPosted: Fri Apr 20, 2018 2:44 pm     Reply with quote

temtronic wrote:

Where's the '1' supposed to be IFted to ?

It's a quick way to comment out or enable blocks of code (for a debug
or release version, for example) without using block comments:
Code:

/*


*/
Ttelmah



Joined: 11 Mar 2010
Posts: 13536

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PostPosted: Sat Apr 21, 2018 1:43 am     Reply with quote

The only thing it is much nicer to use meaningful names:
Code:

#define SMALL_CHIP

#ifdef SMALL_CHIP
   #include <PICxxxxx.h>
   #fuses xxxxx
   #clock
#else
   #include <PICyyyyy.h>
   #fuses yyyyy
   #clock
#endif

If you are compiling for two chips, make the define that selects the second have some name that 'says' what chip you are selecting.
temtronic



Joined: 01 Jul 2010
Posts: 6251
Location: Greensville,Ontario

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PostPosted: Sat Apr 21, 2018 5:19 am     Reply with quote

Thanks for the #if 1 explanation
What got/gets me is the 'unbalanced' IF statement, only one half of the expression is there. Kinda like waiting for the 'other shoe to drop' or a 'one sided' teeter totter, it just looks 'funny' to me.
Have to admit I never use 'choose a processor' code either. Prefer the one project, one PIC method. Then again I started using PICs when they first came out with quartz windows on them
Ttelmah



Joined: 11 Mar 2010
Posts: 13536

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PostPosted: Sat Apr 21, 2018 12:49 pm     Reply with quote

His post does have the #if, #else & #endif.

I have several projects, where years after initial design 'later' chips are used, but the sources still have to be compilable for the original chip. A #if like this is reasonable way of handling the switch.
johngriswold



Joined: 04 Apr 2018
Posts: 13

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PostPosted: Wed Apr 25, 2018 9:51 am     Reply with quote

PCM programmer wrote:
They're not identical. You have two different PICs specified.


1. 16LF15313

2. 16LF1513


Boy, do I feel dumb ! I even had another guy look it over to make sure.

PCM Programmer - thank you for giving me my proper comeuppance.

And yes, Ttelmah - when I am doing more "meaningful" work, I use more meaningful names than 1 and 0.

Embarassed
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