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Extra binary line generated from CCS PCM

 
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epalite



Joined: 06 Apr 2008
Posts: 16

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Extra binary line generated from CCS PCM
PostPosted: Tue Apr 07, 2009 10:17 pm     Reply with quote
Hi,

Following line was extracted, didn't quite understand why was line 387 generated. Any good reason PCM has to dump W into 0x4f? Thanks!

PCM version info:
CCS PCM C Compiler, Version 4.073, 38894
Code:
219:                  set_tris_a(TRISA | 0x20);
   385    0805     MOVF 0x5, W
   386    3820     IORLW 0x20
   387    00CF     MOVWF 0x4f
   388    0085     MOVWF 0x5
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Apr 07, 2009 10:32 pm     Reply with quote
Tell us what PIC you're using. Post a little test program that contains
only that line in main(), and that compiles without errors if it's pasted
into MPLAB.
epalite



Joined: 06 Apr 2008
Posts: 16

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PostPosted: Wed Apr 08, 2009 1:04 am     Reply with quote
Here you go, the source,

Code:

#include <16F690.h>

#define PORTA_MASK   0x01

#byte TRISA   = 0x85

void main() {
   set_tris_a(TRISA | PORTA_MASK);
}


and the compiled, it now appears at line 0x01e (MOVWF 0x26),

Code:

1:                 #include <16F690.h>
   000    3000     MOVLW 0
   001    008A     MOVWF 0xa
   002    2804     GOTO 0x4
   003    0000     NOP
2:                 
3:                 #define PORTA_MASK   0x01
4:                 
5:                 #byte TRISA   = 0x85
6:                 
7:                 void main() {
   004    0184     CLRF 0x4
   005    1383     BCF 0x3, 0x7
   006    301F     MOVLW 0x1f
   007    0583     ANDWF 0x3, F
   008    1703     BSF 0x3, 0x6
   009    101F     BCF 0x1f, 0
   00A    109F     BCF 0x1f, 0x1
   00B    111F     BCF 0x1f, 0x2
   00C    119F     BCF 0x1f, 0x3
   00D    1303     BCF 0x3, 0x6
   00E    131F     BCF 0x1f, 0x6
   00F    3000     MOVLW 0
   010    1703     BSF 0x3, 0x6
   011    009E     MOVWF 0x1e
   012    0199     CLRF 0x19
   013    019A     CLRF 0x1a
   014    1683     BSF 0x3, 0x5
   015    019E     CLRF 0x1e
   016    1283     BCF 0x3, 0x5
   017    019B     CLRF 0x1b
   018    1303     BCF 0x3, 0x6
   019    128D     BCF 0xd, 0x5
8:                    set_tris_a(TRISA | PORTA_MASK);
   01A    1683     BSF 0x3, 0x5
   01B    0805     MOVF 0x5, W
   01C    3801     IORLW 0x1
   01D    1283     BCF 0x3, 0x5
   01E    00A6     MOVWF 0x26
   01F    1683     BSF 0x3, 0x5
   020    0085     MOVWF 0x5
   021    0063     SLEEP
PCM programmer



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Posts: 21708

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PostPosted: Wed Apr 08, 2009 10:26 am     Reply with quote
Quote:
#define PORTA_MASK 0x01
#byte TRISA = 0x85

set_tris_a(TRISA | PORTA_MASK);

You're using the set_tris_a() function incorrectly. This function only
takes a bitmask as the parameter. You don't give it the address of
the TRISA register. The set_tris_a() function is designed to operate
on the TRISA register. The compiler knows the address of that register
inherently.

Just do this and you'll get correct ASM code:
Code:
set_tris_a(PORTA_MASK);
epalite



Joined: 06 Apr 2008
Posts: 16

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PostPosted: Wed Apr 08, 2009 7:34 pm     Reply with quote
PCM programmer wrote:

Just do this and you'll get correct ASM code:
Code:
set_tris_a(PORTA_MASK);


My intent was to set only specific bit but not others. I found the work arounds, and list the result of various methods:

Code:

9:                    set_tris_a(TRISA | PORTA_MASK);
   01A    1683     BSF 0x3, 0x5
   01B    0805     MOVF 0x5, W
   01C    3801     IORLW 0x1
   01D    1283     BCF 0x3, 0x5
   01E    00A6     MOVWF 0x26
   01F    1683     BSF 0x3, 0x5
   020    0085     MOVWF 0x5
10:                   set_tris_a(PORTA_MASK);
   021    3001     MOVLW 0x1
   022    0085     MOVWF 0x5
11:                   TRISA |= PORTA_MASK;
   023    1405     BSF 0x5, 0
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