domeu
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RUN breakout on B+

Sat Jul 26, 2014 10:18 pm

Does anyone know what is the purpose of the RUN breakout (2 pins holes) just next to the leds of B+?

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mahjongg
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Re: RUN breakout on B+

Sat Jul 26, 2014 10:20 pm

reset header.

domeu
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Re: RUN breakout on B+

Sun Jul 27, 2014 9:46 am

That's really strange to name a "reset" as "Run" !
Did someone already tested it on a B+

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rpdom
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Re: RUN breakout on B+

Sun Jul 27, 2014 10:22 am

domeu wrote:That's really strange to name a "reset" as "Run" !
Because it is connected to the "RUN" pin on the chip, which when held high (via a resistor) lets the chip run. When the link is connected it shorts that pin to ground and clears the RUN state.
Did someone already tested it on a B+
It works for me.

domeu
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Re: RUN breakout on B+

Sun Jul 27, 2014 10:50 am

@rpdom: thank for the explanation. It is a very valuable response

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Re: RUN breakout on B+

Sun Jul 27, 2014 2:06 pm

closing the run header resets the PI from a shutdown situation, so it restarts.

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xjonx
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Re: RUN breakout on B+

Wed Sep 10, 2014 2:09 pm

Has anyone experimented with this header? I would be intrested to know if closing and opening these pins will bring the PRi out of the halt state like the P6 header will do on the previous models.

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RaTTuS
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Re: RUN breakout on B+

Wed Sep 10, 2014 2:38 pm

xjonx wrote:Has anyone experimented with this header? I would be intrested to know if closing and opening these pins will bring the PRi out of the halt state like the P6 header will do on the previous models.
yes it is the same
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Re: RUN breakout on B+

Thu Sep 11, 2014 2:32 pm

You're the best! :D
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nxet
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Re: RUN breakout on B+

Thu Jan 21, 2016 8:00 pm

are these pins by any chance readable via software?
my idea is to have the state change to also trigger a shutdown command when the raspi is on. would that be even possible?
Raspbian, Raspberry Pi 2 Model B V1.1

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RaTTuS
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Re: RUN breakout on B+

Fri Jan 22, 2016 8:32 am

nxet wrote:are these pins by any chance readable via software?
my idea is to have the state change to also trigger a shutdown command when the raspi is on. would that be even possible?
no it is a direct link to the GPU reset
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UnlikelyBarley
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Re: RUN breakout on B+

Wed Mar 02, 2016 10:05 am

nxet wrote:are these pins by any chance readable via software?
my idea is to have the state change to also trigger a shutdown command when the raspi is on. would that be even possible?
Not using those pins, but using a GPIO pin you can. Something like this:
http://www.instructables.com/id/Simple- ... wn-Button/

Using this you would end up with a button to shutdown the pi to the halt state (power on, but not running), and another button to restart the pi (from any state, including running and halt).

I've not implemented this myself yet, but it is on my list of thing to do for my OctoPi printer host.

Hope this helps.

Emma_Jir
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Re: RUN breakout on B+

Wed Nov 29, 2017 11:53 am

Has anyone tried tose on a 3B+ Model?
I suppose they are located right under Pin 39 (GND) next to the usb port.
I carefully soldered wires to them but it seems that they response very sensitively. I tried short circuiting them over a kOhm-Resistor but it is not allways effective. It seems they response to static electricity too and i am afraid a cable would maybe even act as antenna scince the device reboots when i move the device in physical area when running. Is there a more proper way to use Run-pins?

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Re: RUN breakout on B+

Thu Nov 30, 2017 6:51 am

One of the run pins is just a GND [round pin]. The other [square pin] is the signal which pulls the _RESET_ pin on the processor LOW when you ground it. So the way to avoid spurious resets you need a 10K pullup on the signal pin to 3V3 so that the pin doesn't float and you don't get noise when your long wire acts as an antenna.
Last edited by DougieLawson on Thu Nov 30, 2017 5:19 pm, edited 1 time in total.
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Emma_Jir
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Re: RUN breakout on B+

Thu Nov 30, 2017 1:01 pm

Thank you i forgot about this tri-state-thing. But the location of the pins on model 3b+ is correct (between GPIO-Pins and USB-Ports roughly on the upper right corner)?

klricks
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Re: RUN breakout on B+

Thu Nov 30, 2017 1:50 pm

Emma_Jir wrote:
Thu Nov 30, 2017 1:01 pm
Thank you i forgot about this tri-state-thing. But the location of the pins on model 3b+ is correct (between GPIO-Pins and USB-Ports roughly on the upper right corner)?
Yes..... look for the RUN silk screen label on the board.
"Tri state" has nothing to do with the RUN pins or any other pins on the RPi......
Unless specified otherwise my response is based on the latest and fully updated Raspbian Stretch w/ Desktop OS.

Emma_Jir
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Re: RUN breakout on B+

Thu Nov 30, 2017 7:49 pm

klricks wrote:
Thu Nov 30, 2017 1:50 pm
"Tri state" has nothing to do with the RUN pins or any other pins on the RPi......
so the rpi-technology is beyond tri-state?

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rpdom
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Re: RUN breakout on B+

Fri Dec 01, 2017 12:20 am

Emma_Jir wrote:
Thu Nov 30, 2017 7:49 pm
klricks wrote:
Thu Nov 30, 2017 1:50 pm
"Tri state" has nothing to do with the RUN pins or any other pins on the RPi......
so the rpi-technology is beyond tri-state?
Tri-state applies to outputs. The RUN pin is an input.

klricks
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Re: RUN breakout on B+

Fri Dec 01, 2017 12:43 am

Emma_Jir wrote:
Thu Nov 30, 2017 7:49 pm
....
so the rpi-technology is beyond tri-state?
I am not sure what you mean?
Tri-State is a decades old feature of some chips that allow the outputs to be turned off like a switch: https://en.wikipedia.org/wiki/Three-state_logic
The RUN circuit has no such controls.
Unless specified otherwise my response is based on the latest and fully updated Raspbian Stretch w/ Desktop OS.

Emma_Jir
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Re: RUN breakout on B+

Fri Dec 01, 2017 3:27 pm

Right, thanks for the rectification i got confused.

The last question would be wich one is input and wich one is gnd on pi model 3B+ i can't make that out.

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rpdom
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Re: RUN breakout on B+

Fri Dec 01, 2017 3:31 pm

Emma_Jir wrote:
Fri Dec 01, 2017 3:27 pm
Right, thanks for the rectification i got confused.

The last question would be wich one is input and wich one is gnd on pi model 3B+ i can't make that out.
If you look carefully at the pads around the holes, one is square and one is round. The round one is the GND side.

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