Re: [android-porting] Serial NMEA GPS support in libhardware_leagcy

[keodouang...@neuf.fr]

Well, being able tout read/write from/to the legacy device through the Serial port doesn't mean that the système recognizes  the device, instead you need to add the support handling to the GPS service, un order, for the system to recognizes the device and notifies through the framework messages as part of the GPS service.

Send on my android mobile.

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De : ApriOri
Date : 26 octobre 2014 21h19
À : android...@googlegroups.com
Cc :
Objet : [android-porting] Serial NMEA GPS support in libhardware_leagcy

Hello.

I have a standard GPS device that I connect to my hardware using a serial port.

I'm able to read NMEA data from /dev/ttyXX but it seems that Android does not pick up the data from the serial port,

I configure it with setprop ro.kernel.android.gps=/dev/ttyXX and gps.baud=38400

Still it seems that android ignore the gps data ( no gps icon in the notification drawer, it is enabled in the location settings)

My build has no libgps.so and I was wondering if any special build steps are required in AOSP to enable GPS support.

Regards.

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[ApriOri]

Thank you.

It seems that some level of support for serial GPS device is already included in the AOSP code since android already provides  ro.kernel.android.gps and ro.kernel.android.gps.baud.

What is the meaning of these parameters?

Does it means that I still have to write the HAL part of the GPS ? even that it's a standard Serial port communication?

[ckkeo]

Indeed, The properties (ro.kernel.android.gps and ro.kernel.android.gps.baud) allow you to set easily the I/O of the device.
Even though, you still need the HAL native part, in order, to notify the GPS service via its JNI implementation on the GPS activities.

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