When I first hook up a Stamp board after its been in storage for awhile,
I usually put something in like:
'{$STAMP BS2}
Debug "Howdy!"
However, that isn't very rigorous. If you feed voltage into pin 24, you
can check for 5V on pin 22. If 5V is not present, the regulator may be
blown. In this case, the Stamp may work if you put 5V regulated on pin
22. I suppose if you were handy enough this could be repaired, but
Parallax will do the repair for you (I think there is a small fee).
If you suspect you've blown an I/O pin, that would be harder to test.
You'd just have to exercise the pins to see if they work or not. I
suppose you could connect P0 to P15, P1 to P14, etc. and "self-test"
with something like this:
DIRS=$FF00
For b1 = 0 to 255
OUTH=b1
if INL<>b1 then fail
Next
DIRS=$00FF
For b1=0 to 255
OUTL=b1
IF INH<>b1 then fail
Next
Debug "OK"
Stopit: goto stopit ' stop without winking
Fail:
OUTL=0
debug "Fail"
goto Stopit
This is untested. It also assumes the serial port is working. If you put
8 LEDs, one on each pin, you'd get a nice display. Wire them so they
light on a high output and if the BS2 is good, all the LEDs would be on
(be careful not to exceed the Stamp's total current drive limit, no
super bright LEDs :-) ). If the LEDs quit moving and are not all on then
you have a failure. If you don't see OK or Fail on the debug terminal
the serial port is bad. While the test is running you get a nice "mad
scientist" display. Of course, if the serial port is bad, it isn't
likely that you could download the program in the first place. However,
if you were doing destructive analysis, this sort of program running
would let you test to see when you had pushed the part too far :-)
Archiver
Posts: 46,084
Comments
When I first hook up a Stamp board after its been in storage for awhile,
I usually put something in like:
'{$STAMP BS2}
Debug "Howdy!"
However, that isn't very rigorous. If you feed voltage into pin 24, you
can check for 5V on pin 22. If 5V is not present, the regulator may be
blown. In this case, the Stamp may work if you put 5V regulated on pin
22. I suppose if you were handy enough this could be repaired, but
Parallax will do the repair for you (I think there is a small fee).
If you suspect you've blown an I/O pin, that would be harder to test.
You'd just have to exercise the pins to see if they work or not. I
suppose you could connect P0 to P15, P1 to P14, etc. and "self-test"
with something like this:
DIRS=$FF00
For b1 = 0 to 255
OUTH=b1
if INL<>b1 then fail
Next
DIRS=$00FF
For b1=0 to 255
OUTL=b1
IF INH<>b1 then fail
Next
Debug "OK"
Stopit: goto stopit ' stop without winking
Fail:
OUTL=0
debug "Fail"
goto Stopit
This is untested. It also assumes the serial port is working. If you put
8 LEDs, one on each pin, you'd get a nice display. Wire them so they
light on a high output and if the BS2 is good, all the LEDs would be on
(be careful not to exceed the Stamp's total current drive limit, no
super bright LEDs :-) ). If the LEDs quit moving and are not all on then
you have a failure. If you don't see OK or Fail on the debug terminal
the serial port is bad. While the test is running you get a nice "mad
scientist" display. Of course, if the serial port is bad, it isn't
likely that you could download the program in the first place. However,
if you were doing destructive analysis, this sort of program running
would let you test to see when you had pushed the part too far :-)
Al Williams
AWC
* NEW: PAK-VIa - Read PS/2 keyboards or mice -- double the buffer, lower
current consumption.
http://www.al-williams.com/awce/pak6.htm
>
Original Message
> From: aztlanpz [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=ZmsSXOC7opltmnOP3DRO7Bf3zINEd9rEiqiZcLPAIALpLtEJ9AvnuGl2yQrhWkn3zgH7hxxJrCUH1ZpMhw]Pedro_Zamora@m...[/url
> Sent: Friday, July 19, 2002 4:27 AM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] BS2 help
>
>
> how can I determined if my BS2 is in good working order?
>
>
>
> Pedro
>
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