Re: PIC16F628A Error: section '.org_0' can not fit the absolute section
Syd
P16F628A.
When I click on Build All the assempler produces this error message:
"Error - section '.org_0' can not fit the absolute section. Section
'.org_0' start=0x00000000, length=0x0000003e
Errors : 1"
Can someone please tell me what is meant by "cannot fit the absolute
section" and how to correct it.
Thanks in anticipation of some help.
Syd
colin
news:1188894054.9...@r34g2000hsd.googlegroups.com...
I dont recognise that section .org_0
is it one you created ?
what does it have in it ?
looks like its the start of your code,
like the interrupt vector table,
maybe it has the wrong attributes or something.
Colin =^.^=
Paul E. Schoen
I would need to see the rest of the code to see how you have it set up. You
may have a problem with a relocatable section, or your code at origin 0 is
overlapping an interrupt vector (usually located at 0x04 or 0x08).
If you use absolute addresses for code, you should use a jump instruction
at ORG 0 to branch to another absolute location past the interrupt vectors.
Using relocatable code, do it like this:
; Data can be located in a specific address space,
; or leave off the address to allow the linker to locate it
group1 UDATA 0x80
a_data res 1 ;0x80
b_data res 1
c_data res 1
;****************** Reset vector ********************
; This code will start executing when a reset occurs.
RST CODE 0x0000
goto Main ;go to start of main code
;****************************************************
; The linker is forced to locate this code at the specified address
INTVEC CODE 0x0004 ; interrupt vector location
goto Isr
;************** Interrupt Processing ****************
; This code can be relocated anywhere by the linker
CODE
Isr:
movwf w_temp ; save off current W register contents
movf STATUS,w ; move status register into W register
movwf status_temp ; save off contents of STATUS register
; Do Interrupt processing
EndIsr
movf status_temp,w ; retrieve copy of STATUS register
movwf STATUS ; restore pre-isr STATUS register contents
swapf w_temp,f
swapf w_temp,w ; restore pre-isr W register contents
retfie ; return from interrupt
;************* Start of Program ****************
Main
; Add your main code here
;************* End of Program ****************
END
Syd
> "Syd" <sydce...@yahoo.com> wrote in message
>
> - Show quoted text -
Hi Paul
My Code partly borrowed from others programming an 16F84A and part
from MPLAB IDE V7.62 follows:
org 0x0000 ; Origin start address for 16f628
;RESET_VECTOR CODE 0x0000 ; processor reset vector **********
; goto Loop
; ****Disable the Comparitors using CMCON Register to make I/O Pins
available for general use****
movlw 0x07 ; Place 07 in the w register
movwf CMCON
Loop ; Label
; ************Setup Ports A & B ************
bsf STATUS, RP0 ; Set Status Bit=1 to select Bank 1
movlw b'00000000' ; Put Bin value into w register
movwf TRISB ; Set Port B All as Outputs
movwf TRISA ; Set Port A All as Outputs
bcf STATUS, RP0 ; Set Status Bit=0 to select Bank 0
; Main ; Start of program ay Label Main
; ********* Switching Port Pins HI = On *****************
movlw 0xff ; ff = 11111111
movwf PORTA ; Set all PORTA pins Outputs = Hi
movlw PORTB ; Set all PORTB pins Outputs = Hi
; ***** Waist 2msecs to ensure ports go fully Hi and then use Delay
Routine to keep Hi for a while *****
NOP ; 1 Microsec with 4MHz Osc
NOP ; 1 Microsec with 4MHz Osc
call Delay ; Increase On time
; ******* Switching All PORTA & PORTB pins 0 = Lo = Off
*****************
movlw 0x00 ; 00 = 00000000
movwf PORTA ; Set all PORTA pins Outputs = Lo
movlw PORTB ; Set all PORTA pins Outputs = Lo
call Delay ; Increase Off time using delay subroutine
goto Loop ; Go back to loop label an do again
; For 250ms delay subroutine (4MHz Clock) Store values in variables
(count1 = 250, count2 = 199, count3 = 1)
Delay movlw d'250' ; Place decimal 250 into w register
movwf count1 ; Store in count1 variable
dl movlw 0xC7 ; Place decimal 199 = Hex C7 into w register
movwf count2 ; Store in count2 variable
movlw 0x01 ; Place decimal 1 = Hex 01 into w register
movwf count3 ; Store in count3 variable
Delay_0 decfsz count2,f ; Decrement count2 (199) & skip next line
if count2 = 0
goto $+2 ; Skip to 2 lines forward (goto d1)
decfsz count3,f ; Decrement count3
goto Delay_0 ; Skip the next line if count3 = 0
decfsz count1,f ; Decrement count1 (250) & skip next line if
count2 = 0
goto dl ; Go back to dl
retlw 0x00 ; Return from subroutine with 0 in w register
end ; End of Program
Syd
> "Syd" <sydce...@yahoo.com> wrote in message
Hi Colin
Paul E. Schoen
goto Main
;***** At reset, you should have a jump to Main, for initialization
org 0x0020
Main: ;This will be your program entry point, past the interrupt
table
Put your port initializations here
>
> ; ****Disable the Comparitors using CMCON Register to make I/O Pins
> available for general use****
> movlw 0x07 ; Place 07 in the w register
> movwf CMCON
>
> Loop ; Label
>
> ; ************Setup Ports A & B ************
> bsf STATUS, RP0 ; Set Status Bit=1 to select Bank 1
> movlw b'00000000' ; Put Bin value into w register
> movwf TRISB ; Set Port B All as Outputs
> movwf TRISA ; Set Port A All as Outputs
> bcf STATUS, RP0 ; Set Status Bit=0 to select Bank 0
> ; Main ; Start of program ay Label Main
>
Loop: ;Here is where the loop should be located
See comments above. You might also check the settings on the IDE. I think
you can switch from relocatable to absolute code which does not require the
linker. Just some thoughts. Good luck,
Paul