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vsmguy
Joined: 13 Jan 2007
Posts: 91
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| [SOLVED] Manipulating large arrays |
 Posted: Wed Aug 12, 2009 10:55 am |
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Using the PIC18F2550 (Has 32k Flash; 2k SRAM; 256byte EEPROM) @ 8MHz INTOSC.
I have to:
1. store large arrays with each having a uniq ID.
2. access them
3. they are to be processed by the same bit banging routine
Hence, what I did was to create a function that would do the bit banging.
This function would lookup the ID against the address of arrays and assign a pointer to the address.
This pointer would then be used by the bit banging routine that does not need to worry about the real address of the array anymore.
| Code: |
#include <18F2550.h>
#fuses INTRC, NOWDT, PUT, BROWNOUT, NOLVP
#device CONST=ROM
#use delay(clock=8000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
#include <stdlib.h>
#include "Z:\\CMU\\Tukka\\norm\\c\\0.h"
#include "Z:\\CMU\\Tukka\\norm\\c\\1.h"
void main()
{
unsigned int16 ID = 0, size = 0, counter = 0;
const char *ptr = NULL; /* Points to memory address */
int8 t = 0;
setup_oscillator(OSC_8MHZ | OSC_INTRC); // 90% precision or 98%?
for(ID = 0; ID < 2; ++ID)
{
switch(ID)
{
case 0:
ptr = zero;
size = sizeof(zero);
break;
case 1:
ptr = one;
size = sizeof(one);
break;
}
printf("\r\nSize = %Lu bytes. Dump from %LX follows\r\n{", size, ptr); /* sizeof reports the correct size */
for(counter = 0; counter < size; ++counter)
{
t = ptr[counter];
printf("0x%X,", t);
}
printf("\b\b\r\n};\r\nDone.");
}
}
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The did all the magic.
Here are snippets from,
#include "Z:\\CMU\\Tukka\\norm\\c\\0.h" :
const char zero[] =
{0xAA,0xAA,0xAA,0xAA,0xAA,0xAA,0xAA,0xAA
,0xD5,0x52,0xAD,0x55,0x54,0xCD,0x55,0x52
,0xA9,0xAB,0x54,0x95,0x9D,0xA9,0x8C,0xD5
,0x6A,0xAA,0xA5,0x52,0xA9,0x29,0xBA,0xDC
,0xC6,0x55,0x55,0x6A,0xA9,0x55,0x52,0x95
..
#include "Z:\\CMU\\Tukka\\norm\\c\\1.h" :
const char one[] =
{0xAA,0xAA,0xAA,0xAA,0xAA,0xAA,0xAD,0x53
,0x52,0xD5,0x52,0xB5,0x54,0xAA,0xC9,0xAA
,0xA9,0x58,0xAF,0x45,0xAB,0x27,0x4B,0x4B
,0x4A,0xAA,0xA6,0xA5,0x4A,0xBE,0x1D,0x34
,0x6D,0x54,0xB5,0x55,0x55,0x54,0xAA,0x92
This raised a few questions however that I have created a new thread for.
(Why can't I attach files in this forum?)
Last edited by vsmguy on Fri Aug 14, 2009 12:49 am; edited 3 times in total |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Aug 12, 2009 11:01 am |
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| Quote: | ** Error 97 "PCH_Test.c" Line 3(5,48): Must have a #USE DELAY before this #USE
*** Error 12 "PCH_Test.c" Line 25(24,28): Undefined identifier zero
*** Error 12 "PCH_Test.c" Line 26(30,34): Undefined identifier zero
*** Error 12 "PCH_Test.c" Line 30(24,27): Undefined identifier one
*** Error 12 "PCH_Test.c" Line 31(30,33): Undefined identifier one
*** Error 132 "PCH_Test.c" Line 35(70,73): STDOUT not defined (may be missing #USE RS232) ::
*** Error 132 "PCH_Test.c" Line 45(23,24): STDOUT not defined (may be missing #USE RS232) ::
*** Error 132 "PCH_Test.c" Line 48(32,33): STDOUT not defined (may be missing #USE RS232) :: |
Your program is not complete. It doesn't compile.
| Quote: | | I had a look at the solution by PCM Programmer, |
Post a link to this previous example. |
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vsmguy
Joined: 13 Jan 2007
Posts: 91
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Aug 12, 2009 9:09 pm |
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| Quote: | *** Error 12 "PCH_Test.c" Line 25(24,28): Undefined identifier zero
*** Error 12 "PCH_Test.c" Line 26(30,34): Undefined identifier zero
*** Error 12 "PCH_Test.c" Line 30(24,27): Undefined identifier one
*** Error 12 "PCH_Test.c" Line 31(30,33): Undefined identifier one
Does it compile now?
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You're still missing the declarations for 'zero' and 'one'. |
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vsmguy
Joined: 13 Jan 2007
Posts: 91
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| Posted: Thu Aug 13, 2009 12:11 pm |
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| PCM programmer wrote: |
You're still missing the declarations for 'zero' and 'one'. |
They are very large arrays - around 400 bytes each.
I wanted to upload these to the forum but can't find anything to help me do that.
Should I upload the files to some filesharing site and post the link here?
Which filesharing site? |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Aug 13, 2009 1:02 pm |
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Just post the declaration and the first line of initialization data
for each array. That will be enough. |
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vsmguy
Joined: 13 Jan 2007
Posts: 91
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| Posted: Thu Aug 13, 2009 4:54 pm |
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| Done! |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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vsmguy
Joined: 13 Jan 2007
Posts: 91
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| Posted: Thu Aug 13, 2009 7:10 pm |
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| Extremely insightful. Will update the thread in a few hours. |
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