Re: [gpsd-dev] GPSd with Broadcom bcm4752

[amacias]

Hi GPSD people,
 The format of /dev/ttyMFD1 data is not known, but reverse engineering 
of Android's "gpsd" shows ASN1C files. So probably the data is ASN1 
encoded or DER encoded.

Also the "gpsd" must send some kind of data to initialize the device. If 
you start the device and run a "cat /dev/ttyMFD1" command you will see 
that nothing appears.


And there is a control socket too /data/gps/glgpsctrl that recognizes 
"pglirm" commands. If you search in Google "gps pglirm" you will se a 
PDF called "i.MX27 PDK 1.0 Linux GPS-B User's Guide - Element14" that 
describes some of these commands.

 
https://www.google.es/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwiN-vbxgOPMAhUDtBQKHdHHA1sQFgglMAA&url=https%3A%2F%2Fwww.element14.com%2Fcommunity%2Fservlet%2FJiveServlet%2FdownloadBody%2F32525-102-4-243814%2FFreescale-i.MX27-MCIMX27VOP4A-Learning%2520Centre%2520MCU-User%2520Manuals-Freescale.User_Guide_2.pdf&usg=AFQjCNGMvhUWXuad-Bw1HCzLwPkAAqURbQ&bvm=bv.122129774,d.d24

I use the attached "device-hook" file to activate and deactivate the 
GPS.

So, in order to send you a sample I have to start the Android's "gpsd", 
send a '$pglirm,req_pos,gpsd00,50' command to the control socket, and 
after that perform a "cat /dev/ttyMFD1". But that will be two different 
pieces of software ("gpsd" and "cat") accesing to the same /dev/ttyMFD1 
at the same time. That would probably be a corrupted sample.

Best regards!


El 17-05-2016 20:17, Gary E. Miller escribió:
> Yo amacias!
>
> On Tue, 17 May 2016 12:54:18 +0200
> amacias <address@hidden> wrote:
>
> > Is a software that reads binay data from /dev/ttyMFD1 and gives to
> > you NMEA data in a socket (similar to /tmp/nmeaNP in Gllin).
>
> Is the format of the /dev/ttyMFD1 data known?  Can you send this
> list a sample?  Maybe GPSD could read that directly with some work.
>
> RGDS
> GARY
> ---------------------------------------------------------------------------
> Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
>         address@hidden  Tel:+1 541 382 8588

device-hook
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