From: Ed Wildgoose <ed@wi...> - 2007-02-05 13:41:15
I'm looking at adding a GPS tracking system onto a mobile telephone
(cellphone) which already has a single serial port in. The snag is that
we need to use the phone also for a computer to be able to dial the
internet (Windows PC), and hence we need to daisy chain the two devices
with the PC talking to the gumstix, then the gumstix disengages from
talking down the serial port and forwards on the data, re-inserts itself
in tracking mode afterward the computer stops talking
Has anyone tried anything like this? Is there any support for
autobauding on the gumstix? What about low power sleep modes with
wakeup if there is activity on the serial input? Anyone tried making
the bluetooth act in a similar way, ie the gumstix acts as a passthrough
interface in this case to repeat the bluetooth serial connection down to
the modem on the real serial line?
The modem only speaks at a narrow range of serial speeds and prefers to
talk at 19,200 baud if possible.
I'm just after some ideas as to how I might tackle this at this stage?