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Bootloader?

 
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Tagge



Joined: 23 Aug 2005
Posts: 93

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Bootloader?
PostPosted: Fri Feb 24, 2006 6:28 am     Reply with quote
Is there somewhere out there a bootloader for:
pic18f2525
xt 4Mhz
software rs232 uart

thankful for any suggestions
asmallri



Joined: 12 Aug 2004
Posts: 1634
Location: Perth, Australia

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PostPosted: Fri Feb 24, 2006 10:14 am     Reply with quote
I can probably help. I will PM you.
_________________
Regards, Andrew

http://www.brushelectronics.com/software
Home of Ethernet, SD card and Encrypted Serial Bootloaders for PICs!!
Tagge



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PostPosted: Tue Feb 28, 2006 3:51 am     Reply with quote
Hi,
a rather good link for some hints that I found on the net.
For CCS bootloader.
http://www.commlinx.com.au/PIC_bootloader.htm
It seems that the CCS loader is possible to use as i wanted....
I will be back if i manage to get it work, maybe someone else also needs this kind of a bootloader, and for free..
Hints are welcome,
tagge
Tagge



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PostPosted: Wed Mar 01, 2006 7:03 am     Reply with quote
Hi out there,
I managed to get the CCS loader to work but with some problems.
The brownout detection and maybe even some other fuses dont seems to work?
its set in the fuses in both bootloader and application but after I programmed the chip thru bootloader it doesnt work. I have to wait for at least a minute(due to some caps, to <0,5V) after powerdown until i get a proper reset? if I start it before that its stuck in the last mode, no proper reset done.
Do I have to relocate reset vector and interrupt vectors, have they something to do with it? and where? are some fuses overwritten, is it possible?
I get the feeling that the reset vector is in some wrong place?
Is this the right settings for a 18F2525? I had to set the isr loader_end to +9, else I got a invalid org range?
Code:

#define LOADER_END   0x4FF
#define LOADER_SIZE   0x3FF
#ifndef _bootloader
#build(reset=LOADER_END+2, interrupt=LOADER_END+9)
#org 0, LOADER_END {}
#endif

In my .lst file of the application
Code:

0500:  GOTO   3FAA //reset moved from 0x0 to 0x4FF+2 !=0x0500, not OK? shouldnt it be 0x0501? but the goto adress is right.
*
0508:  GOTO   05B8 //this is isr?
050C:  NOP
050E:  NOP
//further
05B6:  RETFIE 0
05B8:  MOVWF  19  //isr to here? wrong?
05BA:  MOVFF  FD8,1A
//further
.................... void main(void)
.................... {
*
3FAA:  CLRF   FF8    //this is OK

Fuses settings, the same in bootloader.c and my application.c
something wrong with them?
Code:

#include <18F2525.h>
#device HIGH_INTS=true
//#device ICD=TRUE
#device adc=8

#FUSES WDT                    //Watch Dog Timer
#FUSES WDT128                   //Watch Dog Timer uses 1:128 Postscale
#FUSES XT                       //Crystal osc <= 4mhz
#FUSES NOPROTECT                //Code not protected from reading
#FUSES NOIESO                   //Internal External Switch Over mode disabled
#FUSES BROWNOUT                 //Reset when brownout detected
#FUSES BORV27                   //Brownout reset at 2.7V
#FUSES PUT                      //Power Up Timer
#FUSES NOCPD                    //No EE protection
#FUSES STVREN                   //Stack full/underflow will cause reset
#FUSES DEBUG                    //Debug mode for use with ICD
#FUSES NOLVP                    //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOWRT                    //Program memory not write protected
#FUSES NOWRTD                   //Data EEPROM not write protected
#FUSES NOEBTR                   //Memory not protected from table reads
#FUSES NOCPB                    //No Boot Block code protection
#FUSES NOEBTRB                  //Boot block not protected from table reads
#FUSES NOWRTC                   //configuration not registers write protected
#FUSES NOWRTB                   //Boot block not write protected
#FUSES FCMEN                    //Fail-safe clock monitor enabled
#FUSES NOXINST                //Extended set extension and Indexed Addressing mode disabled
#FUSES NOPBADEN                 //PORTB pins are configured as digital I/O on RESET
#FUSES LPT1OSC                  //Timer1 configured for low-power operation
#FUSES MCLR                     //Master Clear pin enabled

#use delay(clock=4000000)

Beside that above the whole application seems to work ok, and
I got the software UART to work as well, so, if someone needs help with that Im at yor use..
Have a bugless day/
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