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Message |
vamsi_ak Guest
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PIC18F4520 Bootloader |
Posted: Wed Nov 14, 2007 11:50 am |
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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 |
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curt2go
Joined: 21 Nov 2003 Posts: 200
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Posted: Wed Nov 14, 2007 3:05 pm |
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There is a ton of info alreay on that stuff. Search on bootloaders and you will get tons of info.. Hope that helps.. TTY |
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Vamsi Guest
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boot loader for 18F4520.h |
Posted: Wed Nov 14, 2007 3:29 pm |
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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));
}
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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
to
i get the following error
invalid ORG range
Please pass your suggestions
Thank you,
Vamsi
it gives the |
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ckielstra
Joined: 18 Mar 2004 Posts: 3680 Location: The Netherlands
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Posted: Wed Nov 14, 2007 4:01 pm |
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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. |
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Vamsi Guest
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Thank you |
Posted: Wed Nov 14, 2007 5:02 pm |
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Thank you...it helped i am able to work on it now..... |
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