BS2sx Deaf but Alive

Archiver

Hello all,

I have been trying to communicate with my BS2sx for some time now (i posted
an earlier message in March). I can tell the program is running because the
debug terminal receives an initialization message included in my code
topside.

*HOWEVER*

The processor seems to ignore the RESET button as well as any commands the
PC happens to send. Naturally, the s/w reports "stamp not responding" etc.

I have somehow this notion that the programme caused the Scenix chip to
enter a "deafness" mode of some sort, whereas it runs at power-up and then
locks in.

Then, what i may really need is an overriding command to force the uC to
stop and listen (i.e. accept a new programme). Just for the record, BX24
calls a similar procedure "rescue" - most deservingly!

Please, can someone advise on this (madly frustrating - needless to say)
situation. I am especially and directly addressing Parallax people: they
know the uC's various reset and power-down modes and may propose appropriate
signaling, in case my assumption is founded.

Thank you in advance,

George Chamilothoris

Archiver

I've heard that this can sometimes happen, if you put the Stamp into a tight
loop, like
start:
goto start.
-William

---

Original Message

---

From: George Chamilothoris <thor@t...>
To: BasicStamps <basicstamps@egroups.com>
Sent: Friday, May 19, 2000 2:48 AM
Subject: [noparse][[/noparse]basicstamps] BS2sx Deaf but Alive


> Hello all,
>
> I have been trying to communicate with my BS2sx for some time now (i
posted
> an earlier message in March). I can tell the program is running because
the
> debug terminal receives an initialization message included in my code
> topside.
>
> *HOWEVER*
>
> The processor seems to ignore the RESET button as well as any commands the
> PC happens to send. Naturally, the s/w reports "stamp not responding" etc.
>
> I have somehow this notion that the programme caused the Scenix chip to
> enter a "deafness" mode of some sort, whereas it runs at power-up and then
> locks in.
>
> Then, what i may really need is an overriding command to force the uC to
> stop and listen (i.e. accept a new programme). Just for the record, BX24
> calls a similar procedure "rescue" - most deservingly!
>
> Please, can someone advise on this (madly frustrating - needless to say)
> situation. I am especially and directly addressing Parallax people: they
> know the uC's various reset and power-down modes and may propose
appropriate
> signaling, in case my assumption is founded.
>
> Thank you in advance,
>
> George Chamilothoris
>
>
>
>
>
>

Archiver

>I can tell the program is running because the
>debug terminal receives an initialization message included in my code
>topside.
> The processor seems to ignore the RESET button as well as any commands
the
> PC happens to send. Naturally, the s/w reports "stamp not responding"
etc.

Does it send the initialization message when you power up the chip, but not
when you press the reset button? If it is not responding to the reset
button, then maybe 1) the button is defective, 2) the reset pin on the chip
is stuck at the high level. Measure the voltage on the reset pin of the
bs2sx (pin 22) as you press reset. Also measure that same pin 22 voltage
as you bring the atn pin (pin 3) to a high +5 volt level.

-- Tracy