sdio-linux-devel

[Sdio-linux-devel] Using cat pharos GPS data

[boku <bok...@gm...>]

Hi,
    I use cat /dev/ttyxx to check if there's data from pharos GPS. It did
output some text data such
$GP.... 0,50.0,50.0*05
But why the "cat" doesn't quit?  It just hanged there unless I type "Ctrl+C"
to quit.
Is it correct?

<ps> I checked some message and found while upper application uses
gps_start_tx() and it did use CMD 52 to write pharos UART IER register.
After that, it is hanged.

BR,
Victor

Re: [Sdio-linux-devel] Using cat pharos GPS data

[Paul L. <pl...@at...>]

The GPS interface is a rather inefficient continuous stream of cmd52's=20
over the bus. On slow machine it may not keep up. You could turn on some=20
of the debug messages in the GPS driver and see what is coming in off=20
the device.

Paul L

________________________________

From: boku [mailto:bok...@gm...]=20
Sent: Wednesday, July 18, 2007 4:43 AM
To: sdi...@li...
Subject: [Sdio-linux-devel] Using cat pharos GPS data



Hi,

    I use cat /dev/ttyxx to check if there's data from pharos GPS. It=20
did output some text data such
$GP.... 0,50.0,50.0*05=20
But why the "cat" doesn't quit?  It just hanged there unless I type=20
"Ctrl+C" to quit.=20
Is it correct?=20
=20
<ps> I checked some message and found while upper application uses=20
gps_start_tx() and it did use CMD 52 to write pharos UART IER register.=20
After that, it is hanged.=20
=20
BR,=20
Victor

Re: [Sdio-linux-devel] Using cat pharos GPS data

[Nicolas P. <ni...@ca...>]

On Wed, 18 Jul 2007, Paul Lever wrote:

> The GPS interface is a rather inefficient continuous stream of cmd52's 
> over the bus. On slow machine it may not keep up. You could turn on some 
> of the debug messages in the GPS driver and see what is coming in off 
> the device.

BTW, the SDIO code scheduled for mainline integration available from 
git://git2.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc.git in the 
"sdio" branch has a fully functional and rock solid GPS driver now.  It 
works fine, even with polled IRQs, with no noticeable load on the 
system.

I invite anyone interested to have a look and even contribute more 
drivers and/or improvements if possible.


Nicolas