Re: [Gumstix-users] Robostix 3 leds are constantly on and Gumstix doesn't react

[Liorrrrr <li...@ho...>]

Another thing - I checked the Vpwr I inserted into the TTL pin - it was 15V. 
Can it be so devistating, especially it it's only an output?

Lior.


Liorrrrr wrote:
> 
> Hey Dave,
> 
> All the leds are still on every time I attach power supply.
> 
> I checked the voltage regulators, and it seems that I get the correct
> voltage on each of the checkpoints besides VCC5, which doesn't match my
> revision (1131), but I checked some points around it and it seems somehow
> ok(~3.1V)... . V_BATT looks ok too (5V).
> 
> 1. Does Connex200xm (my model) has this kind of voltage checkpoints scheme
> as well?
> 2. Is there any trigger or external pulse that can bring everything back
> to factory defaults?
> 3. How about JTAG? Can it work here?
> 4. In case I really fried it - what can be done? Do I need to send it to
> somewhere or just buy a new one? Which component (Robostix, Connex)?
> 
> 5. Regarding your question, I have Wifistix EU card attached as well, but
> I don't think it's damaged, besides the fact that I can't connect through
> SSH (I blame that on the Gumstix).
> 
> Thanks,
> Lior.
> 
> 
> 
> Dave Hylands wrote:
>> 
>> Hi Liorr,
>> 
>>>  I accidently used a higher voltage (iRobot Create Vpwr) in STUART +5
>>> pin
>>>  (Where the TTL +5V was supposed to be). The result was that the 3
>>> robostix
>>>  leds (red, blue and orange) lit up, and since then it's like that and
>>>  nothing reacts (serial console, boot, SSH).
>> 
>> So - The +5 signal on the STUART is an output, intended to power
>> RS-232 level shifters and whatnot. You generally never connect power
>> supplies together, unless it's specifically designed to allow that
>> (although you always connect grounds together).
>> 
>> You may have fried something.
>> 
>>>  I tried the following actions:
>>>
>>>  1. I tried to connect using the serial - Does not response.
>>>  2. I connected Gumstix and Wifistix together (without the Robostix) in
>>> order
>>>  to login using SSH, but the Gumstix doesn't allocate any IP from my
>>> router,
>>>  so I can't connect or even know if it's booting.
>>>
>>>  My questions:
>>>  1. What is the meaning of the different leds? What does the combination
>>> of
>>>  all 3 of them tell the user? Is there a documentation somewhere?
>> 
>> The LEDs are just LEDs connected up to GPIO lines on the ATMega128.
>> They only have meaning in the context of a program running on the
>> ATMega128. The fact that they all came on means that they were getting
>> powered through your Vpower connection instead of through the voltage
>> regulators on the robostix.
>> 
>>>  2. Is there a reset action that could be taken (Maybe some pulse to
>>> some
>>>  pin...?)?
>> 
>> Power cycle it resets everything. Leave it unconnected from power for
>> 10 seconds just to make sure the caps get a chance to drain (this is
>> overly conservative - but it can't hurt).
>> 
>>>  3. How can I check my Gumstix for signs of life without the Robostix?
>>>
>>>  4. Had anyone ever handled such an event? Can anyone help? I hate to
>>> think I
>>>  destroyed my whole projet in one act of stupidism....
>> 
>> Unfortunately, that's all it takes. You may have fried one of the
>> voltage regulators on the robostix. This page shows where they are
>> located:
>> <http://docswiki.gumstix.com/Robostix_troubleshooting>
>> Sometimes they move around a bit with different revisions of the board.
>> 
>> With the robostix all by itself, you should be able to apply power
>> (through the correct connector), and then check each of the voltage
>> regulators with a multimeter.
>> 
>> If the V_BATT regulator is dead (which sounds like the likely
>> culprit), then that would explain why you can't see anything on the
>> serial port. V_BATT is used to power one side of the voltage converter
>> chips, and to feed power to the gumstix.
>> 
>> Depending on what voltage Vpwr was, you may have fried stuff on the
>> gumstix too, since V_BATT is the input voltage to the voltage
>> regulators on the gumstix board.
>> 
>> Do you have any other daugthercards other that the robostix?
>> 
>> -- 
>> Dave Hylands
>> Vancouver, BC, Canada
>> http://www.DaveHylands.com/
>> 
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>> 
> 
> 

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