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Fro_guy
Guest
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| Ram Woes |
 Posted: Tue Apr 18, 2006 8:37 am |
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Is there a way to set global varrables in the ram at a certian location, so the compiler will put it in the same place every time?? I searched the forms but couldent find anything.
Thanks! |
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ckielstra
Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands
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| Posted: Tue Apr 18, 2006 8:47 am |
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| Check the manual for the description of the #locate command. |
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Fro_Guy
Guest
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| Posted: Tue Apr 18, 2006 8:54 am |
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thats what i was looking for.
Thanks! |
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Fro_Guy
Guest
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| Posted: Tue Apr 18, 2006 9:13 am |
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When you use the locate command, i am trying to use an array. It dosent allow you to put the brackets in for the array so i was wondering if it is only going to reserve the starting adress. Would i have to do the #locate followed by a #reserve to save the space for the array or will the compiler know to reserve that ram? Sorry for all the questions.
Thanks!
Fro_Guy |
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Ttelmah
Guest
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| Posted: Tue Apr 18, 2006 9:41 am |
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Look at the example. You don't declare the array (or any variable) with locate. Declare the array 'as normal', and then just locate the array.
The example, shows this with a float (4 bytes).
So:
| Code: |
int8 demo_array[20];
#locate demo_array=0x50
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The 'symbol map' for this, gives:
050-063 demo_array
Best Wishes |
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treitmey
Joined: 23 Jan 2004
Posts: 1094
Location: Appleton,WI USA
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| Posted: Tue Apr 18, 2006 9:42 am |
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From the symbol file it looks like it resurved the whole array.
| Code: | #include <18f452.h>
#use delay(clock=40000000)
#use rs232(baud=19200,xmit=PIN_C0,invert,stream=DEBUG,disable_ints) // stderr(same as debug)
#fuses h4,nowdt,noprotect,nolvp
#case
#zero_ram
//---------------- main --------------------
void main(void){
int8 array[17];
#locate array=0x100;
set_tris_c(0xFF);set_tris_a(0);set_tris_b(0);set_tris_d(0);set_tris_e(0);
setup_adc_ports(NO_ANALOGS);
fprintf(DEBUG,"1\n\r");
fprintf(DEBUG,"2\n\r");
fprintf(DEBUG,"3\n\r");
array[2]=7;
while(1){ }
}
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| Code: |
000 @SCRATCH
001 @SCRATCH
001 _RETURN_
002 @SCRATCH
003 @SCRATCH
004 @SCRATCH
006 main.@SCRATCH
007 @PUTCHAR_1_.P1
008 @PUTCHAR_1_.@SCRATCH
100-110 main.array
F83 PSP_DATA
FBB CCP_2_LOW
FBB-FBC CCP_2
FBC CCP_2_HIGH
FBE CCP_1_LOW
FBE-FBF CCP_1
FBF CCP_1_HIGH
0040 @PUTCHAR_1_
0090 main
0004 @const10057
0018 @const10062
002C @const10067
0090 @cinit
Project Files:
C:\ccs\Projects\3200I\junk.c
C:\PROGRA~1\PICC\devices\18f452.h
Units:
C:\ccs\Projects\3200I\junk.c (main)
Compiler Settings:
Processor: PIC18F452
Pointer Size: 16
ADC Range: 0-255
Opt Level: 9
Short,Int,Long: 1,8,16
Case Sensitive: Yes
Output Files:
Errors: C:\ccs\Projects\3200I\junk.err
INHX32: C:\ccs\Projects\3200I\junk.hex
Symbols: C:\ccs\Projects\3200I\junk.sym
List: C:\ccs\Projects\3200I\junk.lst
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... beat me by 1 min. |
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Fro_Guy
Guest
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| Posted: Tue Apr 18, 2006 9:47 am |
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Thanks for all they help guys. I should be off tot he races now!
Thanks again!
Fro_Guy |
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