[Elecraft] USB/Serial adapters and sleep mode on OS X

[David Fleming]

This is precisely how I'm doing it, but with a plug-in. I have four callback events that give complete control of the sleep cycle.

Thanks, Chen.

David, W4SMT

--- On Sun, 9/5/10, Kok Chen <chen at mac.com> wrote:

> > But the Keyspan and FTDI adapters get very grumpy when
> they wake up after being put to sleep. 
> 
> The way I handled this in µH Router (the microHAM devices
> uses FTDI chips) is to register for MacOS X Power Manager
> callbacks. 
> 
> Before the Mac OS X Power Manager sends the hardware into
> sleep mode, it will call back and at that time, I do an
> ordered shutdown of any opened microHAM ports.  When
> the Power Manager again calls back when the machine wakes
> up, I reopen the serial port (setting baud rate and restart
> the microHAM watchdog timer) of any microHAM box(es) that
> was(were) previously connected.
> 
> When the Mac OS X Power Manager calls back before going to
> sleep, you also have the option of telling the system to
> terminate the sleep process.
> 
> See http://developer.apple.com/mac/library/qa/qa2004/qa1340.html
> .
> 
> For example, if there is something critical that is
> happening, you can terminate sleeping, finish anything that
> you are doing that cannot be stopped (like changing the
> firmware of the K3 :-), and when that task is completed,
> finally ask the Power Manager to go to sleep.
> 
> 73
> Chen, W7AY
> 
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