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iw2nzm
Guest
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| PIC18F4520 bootloader question |
 Posted: Sun Nov 26, 2006 11:41 am |
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Hi,
I'm new to bootloaders. I have a PIC18F4520 with a 10Mhz oscillator.
I need to update firmware via RS232. I would like to send an 'upgrade' command and then reset the micro with reset_cpu() function.
After the reset the bootloader should wait for a while and if the host send a start command begin the update.
I modified the bootloader example in this way:
| Code: |
#elif defined(__PCH__)
#include <18F452.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7) // Jumpers: 8 to 11, 7 to 12
#endif
#define _bootloader
#include <bootloader.h>
#include <loader.c>
#if defined(__PCM__)
#org LOADER_END+1,LOADER_END+10
#elif defined(__PCH__)
#org LOADER_END+2,LOADER_END+30
#endif
void application(void) {
while(TRUE);
}
#if defined(__PCH__)
#org 0x40,0x7F
#else
#org 0x20,0x3F
#endif
void main(void)
{
long timeout;
timeout=0;
while(!kbhit() && (++timeout < (100000)))
delay_us(10);
if(kbhit())
load_program();
application();
}
#ORG default
#int_global
void isr(void) {
jump_to_isr(LOADER_END+5*(getenv("BITS_PER_INSTRUCTION")/8));
}
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I get this error:
error - 71: out of ROM, a segment or the program is too large. Main.
I guess it is due the change I made: the new code size is greater than the example. However, I don't know how fix it. Is there a problem with an #ORG directive?
Could anyone help me, please?
Than you
Marco / iw2nzm |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sun Nov 26, 2006 12:56 pm |
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That's not the full error message. I put your program into MPLAB
and compiled it with PCH vs. 3.249. I got this:
| Quote: |
Error 71 "C:\Program Files\PICC\Projects\PCH_Test\PCH_Test.c"
Line 74(0,1): Out of ROM, A segment or the program is too large
main Seg 00040-0007E, 0040 left, need 0046
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The last line is a major clue. You have this line in your code:
What should be done to that line of code to increase the segment size ?
Get the current CCS manual:
http://www.ccsinfo.com/downloads.php
Look in the section on #org. How are the two numbers in the #org
statement used ? Which one should you change ? |
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iw2nzm
Guest
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| Posted: Sun Nov 26, 2006 3:23 pm |
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| PCM programmer wrote: | The last line is a major clue. You have this line in your code:
What should be done to that line of code to increase the segment size ?
[...] How are the two numbers in the #org
statement used ? Which one should you change ? |
Well, I guess I should change the first parameter. I replaced it with a smaller one and now it works. I'm trying to download new firmware now.
Thank you
Marco / iw2nzm |
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Vamsi
Guest
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| Sameproblem |
| Posted: Wed Nov 14, 2007 2:34 pm |
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Hi guys,
i still have the same problem. Though i change 0x40 to a lower value i still get the same error.
Can anyone help me in this ? Actually i am using PIC18F4520.h and not 18F452
Thank you,
Vamsi |
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ckielstra
Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands
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| Posted: Wed Nov 14, 2007 3:54 pm |
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Vamsi, please stick to your original thread.
Posting in an old thread from someone with similar but slightly different problems is confusing and will not get you the correct answers. |
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