I am attempting to time some loop code using the simulator's Stopwatch. My
target is the PIC16F1459.
I am able to use the stopwatch in another project with the same target but
in C rather than assembler. This small standalone project's assembler
code (shown below) actually contains loops generated by the XC8 C compiler
from calls to __delay_ms() which I have copied from the compiler's .lst
file and made into a separate (Assembler) project. I am doing this
largely out of curiosity about the code and its timing.
In the simulator I can build and debug the assembler project, set a couple
of breakpoints, at the top and bottom of a loop, run to the first
breakpoint, clear the stopwatch and run to the second breakpoint. The
stopwatch however always reports 'Stopwatch cycle count = undefined'.
I believe I have set the relevant CONFIG parameters correctly, which are
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=INTOSC
CONFIG WDTE=OFF
CONFIG PWRTE=OFF
CONFIG MCLRE=OFF
CONFIG CP=OFF
CONFIG BOREN=ON
CONFIG CLKOUTEN=OFF
CONFIG IESO=OFF
CONFIG FCMEN=OFF
; Configuration word 2
CONFIG WRT=OFF
CONFIG CPUDIV=NOCLKDIV
CONFIG USBLSCLK=1 ; 1 = USB Clock divide-by 8 (48 MHz system input clock expected)
CONFIG PLLMULT=1 ; 1 = 3x PLL Output Frequency is selected
CONFIG PLLEN=ENABLED
CONFIG STVREN=ON
CONFIG BORV=LO
CONFIG LPBOR=OFF
CONFIG LVP=OFF
PSECT resetVec, class=CODE, delta=2
resetVec:
PAGESEL main
goto main
PSECT code
inner_loop_cnt equ 0x70
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. = 1*1*98 + 4*(230-1)*256 = 234594
movlw 98
u4197:
decfsz 9,f ; NB: Register at address 09 is the 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. = 1*1*63 + 61*(225-1)*256 = 3498047
movlw 63
u4207:
decfsz 9,f ; NB: Register at address 09 is the W register
goto u4207
decfsz inner_loop_cnt,f
goto u4207
decfsz outer_loop_cnt,f
goto u4207
nop2
END resetVec
--
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
Locked
