GPS not working on android lollipop..

[narasimma23]

Hi,

I'm using sabre sdp development board, it has on board GPS module(AH1613).

it's not working on android lollipop.

There is no gps configuration on init.rc & init.freescale.rc and there is no gps libraries on the system & vendor folders....

How to support GPS android lollipop 5.0.0 sdk?

Thanks,

Narasimma

[Rita_Wang]

Hi Narasimma,

You can refer to Gudielines on 3G modem integration​, hope this can help you.
Have a great day,
Dan

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[narasimma23]

Hi Dan,

Thanks for the replay..

I updated the GPS related libraries, and enabled gps service in "init.freescale.rc" file on ANDROID 5.0 SDK, but also it's not working..

So i probed the some pin voltages on the GPS Module and compared with Android 4.2 image which has a working GPS...

Here are my observations...

Pin No.          Signal Name                    Android 4.2          Android 5.0

  1                    GPS_RFIN                         3.098V                    2.231V

  5                    GPS_VBAT                        1.498V                    0.211V

11                   GPS_VDD                          3.097V                    2.198V

13                   RESET                               3.230V                    3.227V

17                   GPS_MODE                       0                              0

  20                  1PPS                                  3.193V                    2.519V

  30                  GPS_RXD                          3.097V                    2.531V

  31                  GPS_TXD                          3.233V                    3.041V

There are lot voltage differences between Android 4.2 and Android 5.0 on GPS module...

Is there any modifications needed on kernel?

How can i resolve this issue?

Thanks,

-Narasimma

[narasimma23]

Hi,

I found the problem for voltage differences...

In Android Lollipop SDK they are not enabled gpio's the following signals to power up the GPS Module...

1. AUX_3V15_EN          GPIO(6, 9)

2. GPS_EN                    GPIO(3, 0)

3. GPS_PPS                  GPIO(3, 18)

So I manually pulled up these gpio's on the sysfs, after this i got the same voltages in all the pins compared with android 4.2, but thereafter also not working...

There are some device node's missing related to GPS on "/dev" directory...

Here is list of dev nods...

1. /dev/athrnmea

2. /dev/athrpipein

3. /dev/athrpipeout

Is there any kernel module required for GPS?

How can i solve this issue?

Regards,

Narasimma