From: Tom Crane <TPCpiclist@mklab.ph.rhul.ac.uk>
To: "piclist@mit.edu" <piclist@mit.edu>
CC: Tom Crane <tpcpiclist@mklab.ph.rhul.ac.uk>
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Date: Wed, 17 Feb 2021 12:21:08 -0800
Subject: [PIC] Using MPLAB X simulator Stopwatch with XC8 assembler code
Thread-Topic: [PIC] Using MPLAB X simulator Stopwatch with XC8 assembler code
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I am attempting to time some loop code using the simulator's Stopwatch. My=
=20
target is the PIC16F1459.

I am able to use the stopwatch in another project with the same target but=
=20
in C rather than assembler.  This small standalone project's assembler=20
code (shown below) actually contains loops generated by the XC8 C compiler=
=20
from calls to __delay_ms() which I have copied from the compiler's .lst=20
file and made into a separate (Assembler) project.  I am doing this=20
largely out of curiosity about the code and its timing.

In the simulator I can build and debug the assembler project, set a couple=
=20
of breakpoints, at the top and bottom of a loop, run to the first=20
breakpoint, clear the stopwatch and run to the second breakpoint.  The=20
stopwatch however always reports 'Stopwatch cycle count =3D undefined'.

I believe I have set the relevant CONFIG parameters correctly, which are=20
derived from those generated by MCC for the C project.

Any ideas?

Thanks
Tom Crane

I am using MPLAB X IDE v.5.45.
-----------------------------------------------------------------------

processor       16F1459

  #include <xc.inc>
; Configuration word 1
CONFIG FOSC=3DINTOSC
CONFIG WDTE=3DOFF
CONFIG PWRTE=3DOFF
CONFIG MCLRE=3DOFF
CONFIG CP=3DOFF
CONFIG BOREN=3DON
CONFIG CLKOUTEN=3DOFF
CONFIG IESO=3DOFF
CONFIG FCMEN=3DOFF
; Configuration word 2
CONFIG WRT=3DOFF
CONFIG CPUDIV=3DNOCLKDIV
CONFIG USBLSCLK=3D1 ; 1 =3D USB Clock divide-by 8 (48 MHz system input cloc=
k expected)
CONFIG PLLMULT=3D1  ; 1 =3D 3x PLL Output Frequency is selected
CONFIG PLLEN=3DENABLED
CONFIG STVREN=3DON
CONFIG BORV=3DLO
CONFIG LPBOR=3DOFF
CONFIG LVP=3DOFF


PSECT resetVec, class=3DCODE, delta=3D2
resetVec:
PAGESEL main
goto main

PSECT code=20
inner_loop_cnt     equ     0x70=20
outer_loop_cnt     equ     0x71

;main.c: 380:         _delay((unsigned long)((64)*(48000000/4000.0)));
main:
        movlw   4
        movlb   4       ; select bank4
        movwf   outer_loop_cnt
        movlw   230
        movwf   inner_loop_cnt           ; 3-deep nested loop count no. =3D=
 1*1*98 + 4*(230-1)*256 =3D 234594
        movlw   98=20
u4197:
        decfsz  9,f                      ; NB: Register at address 09 is th=
e W register
        goto    u4197
        decfsz  inner_loop_cnt,f
        goto    u4197
        decfsz  outer_loop_cnt,f
        goto    u4197
        nop
l5195:




;main.c: 382:         _delay((unsigned long)((1000)*(48000000/4000.0)));
        movlw   61
        movlb   4       ; select bank4
        movwf   outer_loop_cnt
        movlw   225
        movwf   inner_loop_cnt           ; 3-deep nested loop count no. =3D=
 1*1*63 + 61*(225-1)*256 =3D 3498047
        movlw   63
u4207:
        decfsz  9,f                      ; NB: Register at address 09 is th=
e W register
        goto    u4207
        decfsz  inner_loop_cnt,f
        goto    u4207
        decfsz  outer_loop_cnt,f
        goto    u4207
        nop2

END resetVec
--=20
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