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PIC18F4520 Bootloader

 
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vamsi_ak
Guest
PIC18F4520 Bootloader
PostPosted: Wed Nov 14, 2007 11:50 am     Reply with quote
Hi all,

I am new to bootloaders. Can any one give me the code for 18F4520 bootloader. And how do i flash it on to my PIC.

Thank you,
Vamsi
curt2go



Joined: 21 Nov 2003
Posts: 200

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PostPosted: Wed Nov 14, 2007 3:05 pm     Reply with quote
There is a ton of info alreay on that stuff. Search on bootloaders and you will get tons of info.. Hope that helps.. TTY
Vamsi
Guest
boot loader for 18F4520.h
PostPosted: Wed Nov 14, 2007 3:29 pm     Reply with quote
This is my code
Code:

#if defined(__PCM__)
#include <16F877.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)  // Jumpers: 8 to 11, 7 to 12

#elif defined(__PCH__)
#include <18F4520.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+20
#endif
void application(void) {
  while(TRUE)
  {
  delay_ms(1000);
  output_toggle(PIN_B0);
  }
}

#if defined(__PCH__)
#org 0x20,0x7F
#else
#org 0x20,0x3F
#endif
void main(void) {
   if(!input(PIN_B5))
   {
      load_program();
   }

   application();
}

#ORG default

#int_global
void isr(void) {
   jump_to_isr(LOADER_END+5*(getenv("BITS_PER_INSTRUCTION")/8));
}



The error i get is
Out of ROM , A segment or the program is too large application
seg 00500-00512,014 left,need 0016

When i change the line
Code:
 #org 0x40,0x7F

to
Code:
 #org 0x15,0x7F


i get the following error
invalid ORG range

Please pass your suggestions

Thank you,
Vamsi
it gives the
ckielstra



Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands

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PostPosted: Wed Nov 14, 2007 4:01 pm     Reply with quote
The interrupt handlers are using the memory region from 0x0008 to about 0x0025. That's why you got a different error message after you changed the 0x40-0x7F region.

Have another close look at the error message
Quote:
Out of ROM , A segment or the program is too large application
seg 00500-00512,014 left,need 0016
The reserved memory region from 0x500 to 0x512 is two bytes too small. Search your source code for where this region is defined and increase it's size a little.
Vamsi
Guest
Thank you
PostPosted: Wed Nov 14, 2007 5:02 pm     Reply with quote
Thank you...it helped i am able to work on it now.....
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