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moulefrite13
Joined: 22 Jul 2013
Posts: 3
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| [pic18F2520] problem bootloader with interrupt vector |
 Posted: Mon Jul 22, 2013 8:36 am |
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Hi everybody,
I'm new in embedded development, and I try to create a simple project with bootloader + classic program with really basic interrupt ( timer and usart ) on PIC18F2520.
My dev environment :
CCS PCH C Compiler, Version 4.140, xxxxx ( extract from my main.lst file ) and MPLAB IDE v1.70, debugger ICD3.
I used sample provided in PIC directory ( loader.c, ex_bootload, ex_bootloader ).
I also found a thread about these same problem :
http://www.ccsinfo.com/forum/viewtopic.php?t=49819&highlight=remap+interrupt+vector
and a little help on this link
http://www.picprojects.net/serialbootloader/
Now my code :
############ bootloader.h ###############
| Code: |
#ifndef BOOT_H
#define BOOT_H
#NOLIST
#use delay(clock=20000000)
#DEFINE LOADER_END 0x7FF
#BUILD (reset=LOADER_END+1,interrupt=LOADER_END+9)
#ORG 0x000,LOADER_END{}
#endif /* BOOT_H */
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############ appMain.c ###################
| Code: |
#include "18F2520.h"
#DEVICE *=16
#fuses HS
#fuses NOMCLR
#fuses DEBUG
#fuses NOWDT
#include "bootloader.h"
#use rs232(UART1,bits=8,stop=1)
int16 count = 0;
#INT_TIMER1
void timer1_isr()
{
if(count){count--;}
}
#INT_RDA
void rxInterrupt(void)
{
byteReceive = getc();
}
#define COUNTER_VAL 500
void main()
{
setup_timer_1(T1_INTERNAL);
set_timer1(0);
enable_interrupts(INT_TIMER1);
enable_interrupts(INT_RDA);
enable_interrupts(GLOBAL);
count = COUNTER_VAL;
while(TRUE)
{
if(!count)
{
printf("Timer Finished...Restarting\r\n");
count = COUNTER_VAL;
}
}
}
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Now my question is why no interrupt occurs.
I read threads with search module, but some explain I need to remap IVT.
And in my first link ( picprojects ), it explain just to use one line for move reset vector and interrupt vector.
| Code: |
/* ------------------------------------------------------------------------- */
/* map reset vector and interrupt vector */
/* 0x000-0x3FF is used by the bootloader. The bootloader maps the original */
/* reset vector (0x000) to 0x400 and the interrupt vector (0x008) to 0x408. */
/* ------------------------------------------------------------------------- */
#build (reset=0x400, interrupt=0x408)
/* ------------------------------------------------------------------------- */
/* reserve boot block area */
/* This memory range is used by the bootloader, so the application must not */
/* use this area. */
/* ------------------------------------------------------------------------- */
#org 0, 0x3FF {}
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My code build successfully but no interrupt occur, if I comment the line
| Code: | | #BUILD (reset=LOADER_END+1,interrupt=LOADER_END+9) |
my interrupt work fine.
I continued to look for another solution, I analyzed file built ( .LST, .STA, .SYM ) and some people ask to look GOTO instruction, and mine seems to be good
############# main.LST ##################
| Code: |
*
0800: GOTO 091E
*
0808: MOVWF 04
080A: MOVFF FD8,05
080E: MOVFF FE0,06
0812: MOVLB 0
0814: MOVFF FE9,0C
0818: MOVFF FEA,07
081C: MOVFF FE1,08
0820: MOVFF FE2,09
0824: MOVFF FD9,0A
0828: MOVFF FDA,0B
082C: MOVFF FF3,12
0830: MOVFF FF4,13
0834: MOVFF FFA,14
0838: MOVFF FF5,15
083C: MOVFF FF6,16
0840: MOVFF FF7,17
0844: MOVFF 00,0E
0848: MOVFF 01,0F
084C: MOVFF 02,10
0850: MOVFF 03,11
0854: BTFSS F9D.0
0856: GOTO 0860
085A: BTFSC F9E.0
085C: GOTO 08BA
0860: BTFSS F9D.5
0862: GOTO 086C
0866: BTFSC F9E.5
0868: GOTO 08CE
086C: MOVFF 0E,00
0870: MOVFF 0F,01
0874: MOVFF 10,02
0878: MOVFF 11,03
087C: MOVFF 0C,FE9
0880: MOVFF 07,FEA
0884: BSF 07.7
0886: MOVFF 08,FE1
088A: MOVFF 09,FE2
088E: MOVFF 0A,FD9
0892: MOVFF 0B,FDA
0896: MOVFF 12,FF3
089A: MOVFF 13,FF4
089E: MOVFF 14,FFA
08A2: MOVFF 15,FF5
08A6: MOVFF 16,FF6
08AA: MOVFF 17,FF7
08AE: MOVF 04,W
08B0: MOVFF 06,FE0
08B4: MOVFF 05,FD8
08B8: RETFIE 0
............................
............................
............................
0982: BRA 0982
Configuration Fuses:
Word 1: C200 HS FCMEN IESO
Word 2: 1E19 NOPUT NOBROWNOUT BORV21 NOWDT WDT32768
Word 3: 0700 CCP2C1 PBADEN LPT1OSC NOMCLR
Word 4: 0000 NOSTVREN NOLVP NOXINST DEBUG
Word 5: C00F NOPROTECT NOCPB NOCPD
Word 6: E00F NOWRT NOWRTC NOWRTB NOWRTD
Word 7: 400F NOEBTR NOEBTRB
Some fuses have been forced to be compatible with the ICD debugger.
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this first line :
Confirm that my reset vector "jump" to its new address ( 0x091E )
########## main.SYM ##############
| Code: |
..........................
..........................
ROM Allocation:
0008BA timer1_isr
0008CE rxInterrupt
00091E main
0008DC @const80
0008FA @PSTRINGC_9600_31766_31767
00091E @cinit1
000950 @cinit2
..........................
..........................
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############# main.STA ###########
| Code: |
Segment Used Free
----------- ---- ----
00000-007FE 0 2048
00800-00806 4 4
00808-008B8 178 0
008BA-07CBE 202 29500
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I ( suppose I ) see a good mapping 
My real first step is to create a really simple program with dedicated memory space for my (future) boot program and continue to use interrupt.
Is that someone could give me some advice for understand where is my mistake.
Other question, it is necessary to load first the boot program to address 0x0 to 0x7FF before "load" with my ICD 3 the main program and debug it ?
It's possible to run the main program (debug with ICD3 ) with nothing written into the dedicated zone for boot ?
Thanks in advance for your help,
ps : sorry for my bad english 
Regards,
Moulefrite |
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moulefrite13
Joined: 22 Jul 2013
Posts: 3
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| Posted: Fri Aug 02, 2013 2:55 am |
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Please UP  |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19506
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| Posted: Fri Aug 02, 2013 8:33 am |
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As it stands, your bootloader is intercepting the interrupt vectors.
Do you really need interrupts in the bootloader?. Much simpler not to use these.
If you look at the usb_bootloader.h, you will see that this uses interrupt polling, to avoid having to do this....
If you do, you will need a quite complex interrupt re-locator.
Basically you'd have to have an int_global handler, which then tests a flag set in the bootloader, and if this is set (to say you are in bootloader mode), calls the corresponding interrupt routines for the bootloader. If not, it jumps to the interrupt address for the main code. A lot of work, and slows the interrupt response.
Even if you don't use interrupts, your bootloader needs to include the interrupt relocation code. This is the #int_global code in ex_bootloader.c
and, yes, the bootloader needs to be present. If your main code is located at 0x7ff, it is the bootloader that jumps to this location, and that relocates the interrupt vectors.
Best Wishes |
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moulefrite13
Joined: 22 Jul 2013
Posts: 3
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| Posted: Mon Aug 05, 2013 3:51 am |
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| Ttelmah wrote: | As it stands, your bootloader is intercepting the interrupt vectors.
Do you really need interrupts in the bootloader?. Much simpler not to use these.
If you look at the usb_bootloader.h, you will see that this uses interrupt polling, to avoid having to do this....
If you do, you will need a quite complex interrupt re-locator.
Basically you'd have to have an int_global handler, which then tests a flag set in the bootloader, and if this is set (to say you are in bootloader mode), calls the corresponding interrupt routines for the bootloader. If not, it jumps to the interrupt address for the main code. A lot of work, and slows the interrupt response.
Even if you don't use interrupts, your bootloader needs to include the interrupt relocation code. This is the #int_global code in ex_bootloader.c
and, yes, the bootloader needs to be present. If your main code is located at 0x7ff, it is the bootloader that jumps to this location, and that relocates the interrupt vectors.
Best Wishes |
Thanks a lot Ttelmah for your reply,
I confirm my bootloader don't need to use interruption.
My bootloader is used only for flash FW by classic UART.
So if I understand you :
bootloader.hex :
_ use space 0 to 0x7FF
_ DON'T remap interruptVector to 0x808 ( with #build ?? )
_ RELOCATE only interruptVector ( "#int_global" with "jump_to_isr" )
MainFW.hex :
_ Allow memory 0 to 0x7FF like unusable ( reserved )
_ relocate resetVector to 0x800 ( with #build ?? )
_ Do I need to remap interruptVector ???
So I just need to modify this line ( remove interrupt ) in the bootloader.h :
| Code: |
#BUILD (reset=0x800,interrupt=0x808)
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by
| Code: |
#BUILD (reset=0x800) // don't use interrupt
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and add in bootloader.c the code :
| Code: |
#int_global
void isr(void) // relocate interrupt vector
{
jump_to_isr(0x808*(getenv("BITS_PER_INSTRUCTION")/8));
}
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And modify this line in appMain.c :
| Code: |
#BUILD (reset=0x800,interrupt=0x808)
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by
| Code: |
#BUILD (interrupt=0x808) // just relocate interruptVector adress ?
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Please someone could confirm if it's ok,
I will try it soon,
Thanks Ttelmah and any help, link, explanation is welcome,
Best regards,
Moulefrite  |
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