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mattmab
Joined: 13 Mar 2004
Posts: 2
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| int32 |
 Posted: Sat Mar 13, 2004 11:55 pm |
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does anyone understand why this wont work? it seems i cant initialze leds to hex 4000.
thanks ahead - matt
#case
#include <16f876.h>
#device *=16 ICD=TRUE
#use delay( clock=11059000 )
int32 leds = 1;
void main() {
leds = 0x4000;
} |
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Ttelmah
Guest
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| Re: int32 |
| Posted: Sun Mar 14, 2004 3:42 am |
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| mattmab wrote: | does anyone understand why this wont work? it seems i cant initialze leds to hex 4000.
thanks ahead - matt
#case
#include <16f876.h>
#device *=16 ICD=TRUE
#use delay( clock=11059000 )
int32 leds = 1;
void main() {
leds = 0x4000;
} |
Should work. Try declaring the constant as a long - so:
leds= 0x4000L;
Sometimes the compiler is less than 'intelligent' about such things...
Best Wishes |
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mattmab
Joined: 13 Mar 2004
Posts: 2
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| int32a |
| Posted: Sun Mar 14, 2004 9:59 pm |
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nope,4000L dont work either, it takes it as a 16 bit. it works if i use make32(), but that seems like a poor way. does 32 bit math work? i never checked...
thankws - matt |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sun Mar 14, 2004 10:51 pm |
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It actually does work. If I take your code here,
| Code: | #case
#include <16f876.h>
#device *=16 ICD=TRUE
#use delay( clock=11059000 )
int32 leds = 1;
void main() {
leds = 0x4000;
} |
and compile it with PCM vs. 3.184, I get this result in the .LST file:
| Code: | 0011 01A3 00277 CLRF 23
0012 01A2 00278 CLRF 22
0013 3040 00279 MOVLW 40
0014 00A1 00280 MOVWF 21
0015 01A0 00281 CLRF 20 |
The symbol table shows that 'leds' is at address 0x20:
The ASM code is setting the memory locations as follows:
0x23 = 0
0x22 = 0
0x21 = 0x40
0x20 = 0
Since CCS stores variables in Intel Lo-Hi format, this means
that 'leds' = 00 00 40 00 which is correct.
I suspect that the problem is in how you are viewing the 'leds' variable.
For example, if you're using printf, you need to specify the format
string as "%lx", and not "%x", in order to display a 16 or 32-bit number. |
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