[Gta04-owner] GTA04A5 - was 8mW sleep for Beagle Board

NeilBrown neilb at suse.de
Thu Jan 10 23:28:50 CET 2013


On Thu, 10 Jan 2013 23:08:18 +0100 Butrus Damaskus <butrus.butrus at gmail.com>
wrote:

> On Thu, Jan 10, 2013 at 3:02 PM, Dr. H. Nikolaus Schaller
> <hns at goldelico.com> wrote:
> >
> > Am 10.01.2013 um 14:34 schrieb Butrus Damaskus:
> >
> >> On Thu, Jan 10, 2013 at 1:18 PM, Butrus Damaskus
> >> <butrus.butrus at gmail.com> wrote:
> >>> On Thu, Jan 10, 2013 at 11:03 AM, Flemming Richter Mikkelsen
> >>> <quatrox at gmail.com> wrote:
> >>>> Hmmm...
> >>>> If it should function as a remote control, I believe there is two popular
> >>>> frequencies... so one would need two IR LEDs.
> >>>
> >>> "Frequencies" is not the problem, you can generate 40kHz or 36kHz as
> >>> you wish. The wavelength might possibly be a problem but most likely
> >>> it would affect the range and still work to some degree...
> >>
> >> BTW, this is what I found
> >> :http://www.google.de/url?q=http://www.vishay.com/docs/82606/remote.pdf
> >
> > cool information! The key sentence confirms our idea:
> > "the IrDA TXD port should be a multi- function port, which supports
> > also GPIO (General Purpose Output) and UART"
> >
> > This means we should control uart3_tx as GPIO166.
> 
> Just a question: This GPIO166 doesn't have a timer/PWM connected to it?

Nope.  If you have a GTA04 and look in /sys/kernel/debug/omap_mux/
at the file uart3_tx_irtx it contains:

name: uart3_tx_irtx.uart3_tx_irtx (0x480021a0/0x170 = 0x0000), b h21, t NA
mode: OMAP_PIN_OUTPUT | OMAP_MUX_MODE0
signals: uart3_tx_irtx | NA | NA | NA | gpio_166 | NA | NA | safe_mode


So it only has 3 modes:  uart3_tx,  gpio_166, and nothing (safe_mode).

For a timer, you would need a 'gpt' option.

NeilBrown
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