problem with WATCH command SX/B

duffling

Ive been having some problems getting the watch command to work reliably

ive found if i have the watch command in a loop without any other commands inside the loop aside from INC counter1 it works

see my short program below

my watch in the debugger does not show the Counter1 variable increasing at all ..

what am·I doing wrong?

'

---

DEVICE········· SX28, OSC4MHZ, TURBO, STACKX, OPTIONX
FREQ········· ·· 50000000
'

---

LED VAR RC.7
button········· var···· rb.0
counter1······· var···· BYTE
'

---

PROGRAM start
start:

COUNTER1=0

lOOP:

HIGH LED
PAUSE 1000

INC COUNTER1

WATCH COUNTER1,8,UDEC

LOW LED
PAUSE 1000

GOTO LOOP
·

Jon Williams

Since WATCH is a directive for the debugger you don't need to put in a loop -- stick it up with your variable definitions so that you can remove it easier. Then, run your program in Debug mode and step through the program manually so that you can see the variable update.· What you seem to be wanting is for WATCH to behave like the BASIC Stamp DEBUG command; it doesn't work that way.

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Jon Williams
Applications Engineer, Parallax
Dallas, TX· USA

John Kauffman

I also have problems getting the WATCH to behave as expected. I condensed Duffling's code even further and took Jon's advice to move the WATCH to the the VAR declarations, as follows:

'

---

DEVICE SX28, OSC4MHZ, TURBO, STACKX, OPTIONX
FREQ 4_000_000
'

---

' VARs DECLARATIONS
counter1 var BYTE
WATCH COUNTER1,8,UDEC
'

---

PROGRAM start

start:
COUNTER1=0
lOOP:
INC COUNTER1
GOTO LOOP

When I run in debug mode the code and register windows show stepping through the loop but Counter1 in the Watch window remains at zero.

How to get Watch to show contents of a variable while stepping or walking in Debug mode?

Thanks.

Bean

The code seems to debug fine.
You do realize that SXB clears all the memory first and you must step through all that code ?
To make life easier use "PROGRAM start NOSTARTUP" to eliminate the startup code.
Bean.

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·

John Kauffman

Good insight, Bean, to detect the real problem - I did not realize there was a memory clearing at start-up. I was watching it walk through the memory registers but my mind was leaping to wild speculations about how timing might work... I should have realized the obvious.

'Program Start NOSTARTUP' works like a charm. Thanks.