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martint88
Joined: 11 Feb 2011
Posts: 5
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| Memory not available at requested location |
 Posted: Mon Jun 13, 2011 2:26 pm |
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Hello,
I'm trying to use the program memory to save the my system configuration. For the factory defaults, I use the following code:
| Code: |
#rom int8 0x1FC00={0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00}
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When compiling, I receive the "Memory not available at requested location" warning, but in the disassembly, I get the memory correctly initialized.
I'm using PIC18F47J13, and CCS Version 4.110
I also get this warning in the following lines:
| Code: |
union Bits_Sueltos
{
int8 Palabra;
int1 Flags[8];
};
typedef union Bits_Sueltos tipo_Bits;
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Is this the correct way to tell the linker not to use this memory for code?
What is this warning?
Thankyou
regards,
Martin |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Jun 13, 2011 2:39 pm |
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| Quote: |
When compiling, I receive the "Memory not available at requested location" warning.
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I made a test program and I don't get any warning like that in either
Debug or Release configuration:
| Code: |
Executing: "C:\Program Files\PICC\Ccsc.exe" +FH "PCH_Test.c" +DF +LY -T -A +M -Z +Y=9 +EA #__18F47J13=TRUE
>>> Warning 203 "PCH_Test.c" Line 12(1,1): Condition always TRUE
Memory usage: ROM=0% RAM=0% - 0%
0 Errors, 1 Warnings.
Loaded C:\Program Files\PICC\Projects\PCH_Test\PCH_Test.cof.
BUILD SUCCEEDED: Mon Jun 13 13:34:03 2011
------------
List file:
CCS PCH C Compiler, Version 4.110, xxxxx 13-Jun-11 13:34
Filename: C:\Program Files\PICC\Projects\PCH_Test\PCH_Test.lst
ROM used: 48 bytes (0%)
Largest free fragment is 65496
RAM used: 4 (0%) at main() level
4 (0%) worst case
Stack: 0 locations
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Here is the test program:
| Code: |
#include <18F47J13.h>
#fuses HS,NOWDT
#use delay(clock=4000000)
#rom int8 0x1FC00={0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00}
//=====================
void main()
{
while(1);
} |
You should do your typedef like this:
| Code: |
typedef union
{
int8 Palabra;
int1 Flags[8];
}Bits_Sueltos;
Bits_Sueltos tipo_Bits; |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19318
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| Posted: Mon Jun 13, 2011 2:54 pm |
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The warning on the union, is probably because 'arrays of bits are not permitted'.....
Best Wishes |
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martint88
Joined: 11 Feb 2011
Posts: 5
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| Posted: Tue Jun 14, 2011 5:49 am |
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I could solve the problem on the warning, but:
is it true I can´t use arrays of bits? I think I Can in version 4.110...
What i found it doesn´t work is to asign a bit from an array to another bit, as follows:
| Code: |
int1 flag;
int1 flag2[10];
int8 i;
for (i = 0; i < 10; i++)
{
flag = flag2[i]; // this seems not working.
}
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That´s why, i had to replace all bit arrays I used by another code.
Thank you for your help
regards,
Martin |
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dyeatman
Joined: 06 Sep 2003
Posts: 1922
Location: Norman, OK
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| Posted: Tue Jun 14, 2011 5:58 am |
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From the manual on page 43:
| Quote: | SHORT is a special type used to generate very efficient code for bit
operations and I/O. Arrays of bits (INT1 ) in RAM are now supported.
Pointers to bits are not permitted. |
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