Bootloader

[bernardinim]

Hi, i am trying to use ccs bootloader on my project based on Pic18F2525 @ 32 Mhz (external clock). I want to use pins RB6 and RB7 for dowload the code.... All my trials failed.
What are the step that i have to follow ?
(for example i try to download the code with ccs port monitor and i receive a time out error)...

[bernardinim]

Hi, i am trying to use ccs bootloader on my project based on Pic18F2525 @ 32 Mhz (external clock). I want to use pins RB6 and RB7 for dowload the code.... All my trials failed.
What are the step that i have to follow ?
(for example i try to download the code with ccs port monitor and i receive a time out error)...

MY CODE:

#include <18F2525.h>

#FUSES NOWDT //No Watch Dog Timer
#FUSES WDT1 //Watch Dog Timer uses 1:128 Postscale
#FUSES EC //External clock
#FUSES NOPROTECT //Code not protected from reading
#FUSES NOIESO //Internal External Switch Over mode disabled
#FUSES NOBROWNOUT //Reset when brownout detected
#FUSES BORV20 //Brownout reset at 2.0V
#FUSES PUT //Power Up Timer
#FUSES NOCPD //No EE protection
#FUSES STVREN //Stack full/underflow will cause reset
#FUSES NODEBUG //No Debug mode for ICD
#FUSES NOLVP //Low Voltage Programming on B3(PIC16) or B5(PIC18)
#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 NOFCMEN //Fail-safe clock monitor enabled
#FUSES NOXINST //Extended set extension and Indexed Addressing mode disabled (Legacy mode)
#FUSES NOPBADEN //PORTB pins are configured as digital I/O on RESET
#FUSES NOLPT1OSC //Timer1 configured for low-power operation
#FUSES NOMCLR //Master Clear pin enabled

#use delay(clock=32000000)
#use rs232(baud=9600,parity=N,xmit=PIN_B7,rcv=PIN_B6,bits=8)



#define _bootloader


#include <bootloader.h>
#include <loader.c>





#org LOADER_END+2,LOADER_END+20

void application(void) {
while(TRUE);
}


#org 0x40,0x7F

void main(void) {
if(!input(PIN_B3))
{
load_program();
}

application();
}

#ORG default

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

[Ttelmah]

You do understand, that the actual 'bootloader', has to be loaded into the chip with a normal programmer, before you can use it?.

Best Wishes

[bernardinim]

yes.. i know...

It's the first time that i use a bootloader...
What i have to do?

Can u give me a simple example that work.. so i can understand..?

[Ttelmah]

Start by getting rid of all your #org statements. You only need include bootloader.h, not loader.c. Loader.c, is the bootloader program itself, which has to already be in the chip (which is why I queried this). Your program, will actually 'sit' at 0x500, and attempting to put part of it below this, will overwrite/destroy the bootloader code that is already there. The build statement in bootloader.h, already re-vectors the interrupt handler as required.
Compile ex_bootloader.c, and put this into the chip. Then compile your program, just as normal, but with bootloader.h included. The 'load' is triggered by pulling B5 low.

Best Wishes

[bernardinim]

Using ccs serial port monitor i receive the error Timeout when downloading ....
I use these port setting (9600,n,8,1 with no software flow control), It's correct?

I not know if the problem is in serial connection during downloading application or in the bootloader....

Please help me.....[/b]

[Christophe]