Scribbler, nasty hack, EB500

Bergamotoff · 2007-11-23 13:45

DEBUG "Hello world"

I'm extending my Scribbler.
- Connected to PC. Working.
- Already connected Ping))). Working.
- Connected EB500. Working.
Soldered external connector for EB500 DIRECTLY to Stamp's microcontroller (PIC) pins (PINS 7,8, fixed with hot glue).
Now DEBUG and BEDUGIN works also through EB500. I don't have to use dedicated pins for it. Alleluia!
Also I can program stamp using existing serial connector and debug via EB500. Both works. GOTO run
·
run:
When I try to detect stamp using "identify" function in Basic Stamp Editor, I can see that green light on EB500 module
briefly goes on several times, then·Basic Stamp Editor ir reporting that stamp is not found.

Correct me, if I'm wrong - but if DEBUG and DEBUGIN·functions are working over EB500 soldered directly to chip, then
programming should also work? Does anybody know what happens directly when·I press "RUN" button in Basic Stamp Editor?
What is data exchange protocol in programming case?

Help! I need those 2 extra pins for flamethrower and chainsaw ...

··

Regards
Janis

UPDATE: Attached 5 images of what's already done.

Post Edited (Bergamotoff) : 11/30/2007 8:00:10 AM GMT

Whit · 2007-11-28 02:45

Janis,

Can't help with your problem. Sorry... But will watch for other people's answers. Sounds like a neat hack. May we see more, perhaps pictures and details on how you are doing this?

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Whit+

"We keep moving forward, opening new doors, and doing new things, because we're curious and curiosity keeps leading us down new paths." - Walt Disney

Bergamotoff · 2007-11-28 08:43

Hello Whit+
·
Thank you for posting reply; I was already getting scared being·here alone·[noparse];)[/noparse]
I will post this week pictures (except flamethrower and chainsaw, which obviously was a joke).

In the meanwhile - let me share with you a theory. Can it be that during programming and detection BasicStamp2 is not only receiving connection from PC but also initiating it?
·
Like
PC establishes connection to BS
Data is being sent to BS
PC terminates connection
BS·establishes connection to PS
Data is being sent to PC
BS·terminates connection
?
·
Bluetooth·have separate port for incoming and outgoing data connections. Like COM41 and COM42. So, during "identify" my PC can send data to BS2 via COM41, but can not receive data from BS2, because it's being transferred via COM42 but expected via COM41. Sounds logical? Well, I have heard about some method of combining 2 ports in one ... did I? [noparse]:)[/noparse]

Peter Verkaik · 2007-11-28 13:33

Programming a BS and using the identify function, requires the ATN line (eg. DTR)
which is supported by a direct wired connection but most probably not by EB500.
DEBUG and DEBUGIN only use the SOUT and SIN, not ATN (eg. DTR).
Also note that the BS needs its SIN idle level (ca. -10V) to make the SOUT level
swing between -10V and +5V.

regards peter

Bergamotoff · 2007-11-29 08:01

Peter said...
Also note that the BS needs its SIN idle level (ca. -10V) to make the SOUT level swing between -10V and +5V.

I agree·with you in·respect that·BS needs this voltage swing. But Microchip's PIC processor, which is the brain of BS, doesn't. Both pins 7,8 of PIC (residing on board of BS2) are TTL pins. There is something like MAX232 (after PIC) in BS2 board to·make it ·compatible with PC COM logic. So if I·connect to BS2 then I need to account voltage swing, if I SOLDER to PIC chip directly - don't. EB500 bluetooth uses TTL logic for TX and RX too. So no problem with voltage levels compatebility.

Peter said...
Programming a BS and using the identify function, requires the ATN line (eg. DTR) which is supported by a direct wired connection but most probably not by EB500

As connection is initiated from PC I suppose that PC checks for DTR=ON? EB500 manual on page 137 states that pin 6 is CTS (Clear to send) - I wonder what will happen if I make this pin high? Will test on weekend - will it programm or not.

Thank you for your reply!

Peter Verkaik · 2007-11-29 11:08

The stamp editor pulses the DTR signal at the start of the programming.
If the EB500 tranceiver·connected to the PC, supports the RTS and CTS signals,
you could try to swap DTR and RTS, in effect then the RTS signal will be pulsed.
On the EB500 tranceiver connected to the stamp, you then also connect
RTS to ATN.
A pc-builtin bluetooth device probably won't let you swap DTR and RTS.

pc tx

eb500 rx······················· eb500 tx

stamp rx
pc rx

eb500 tx······· wireless······· eb500 rx

stamp tx
pc dtr ---- eb500 cts······················ eb500 rts ---- stamp atn

regards peter

D Faust · 2007-11-30 01:13

I think that the stamp editor looks for a loopback of the commadns it just sent to the stamp.

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--DFaust

Bergamotoff · 2007-11-30 07:55

Hello Whit

As you sugegsted I have updated my post with 5 pictures of what is already done.
Next plan is encoders for wheels.

Thank' s for support to EVERYBODY, I will post an·update on monday
about experiments with programming·using bluetooth

Janis

Peter Verkaik · 2007-11-30 08:55

DFaust,
The stamp editor looks for a connection between RTS and DSR when serial port
is set to auto. If you select a specific port, the connection is not required.

regards peter

Whit · 2007-12-01 02:52

Bergamotoff said...
Hello Whit

As you sugegsted I have updated my post with 5 pictures of what is already done.
Next plan is encoders for wheels.

Janis,

Looks really great! I have a busy weekend coming up, and will study all this in detail later.
Super project! This is Nasty in the best sense of the word...

Bergamotoff also said...
(except flamethrower and chainsaw, which obviously was a joke).

·Too bad!·

··

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Whit+

"We keep moving forward, opening new doors, and doing new things, because we're curious and curiosity keeps leading us down new paths." - Walt Disney

Post Edited (Whit) : 12/8/2007 2:22:54 PM GMT

Scribbler, nasty hack, EB500

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