No blinken lights...

Andy Green andy at
Sat Aug 30 07:36:48 CEST 2008

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Somebody in the thread at some point said:
| Have we discussed this?  Seems to me this is another huge reason we need
| the little micro that can just stay running all the time.
| Someone tried to reach me this afternoon -- they called all of the
| numbers they had for me.  I missed them all.  But at least my Treo was
| blinking the little green LED when I came back inside, to tell me that I
| had missed a call.
| But the Freerunner was lying on the desk like a brick of cheese.  No
| indication at all -- and no possible way to do it AFAIK, unless one
| disables suspend entirely.
| I know we won't have a second little processor on the GTA03, but is
| there any way we can wire up a low-power "blinky" circuit on one of the
| LEDs that can autonomously flash, so that we can let it do its thing
| while the system is suspended?

I did actually use this as example of something the MPU can deliver but
folks didn't take it seriously.  But actually, flashing the LED is most
minimal example of even trivial capability that is outside what we can
do with all our super Linux and everything else -- when it is off.

You're right I don't think we see MPU any time soon despite it would
have advantages.

AFAIK right now we have exactly one LED on GTA03 and it is controlled by
GPS unit TIMEPULSE pin.  It is capable to flash, I can imagine we leave
GPS unit up in suspend, disable GPS function by UBX command assuming it
exists, and set the LED flashing by UBX command if that exists, then
suspend.  It needs confirming but we probably get it that way.

- -Andy
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