libGPS for TinkerBoard Android

[YoZa]

Hello !
This is my last step!


If I order
root@rk3288:/data/data/com.termux/files/home # ls -l /dev/ttyACM0
crw------- root     root     166,   0 1970-01-01 02:00 ttyACM0
root@rk3288:/data/data/com.termux/files/home # chmod 666 /dev/ttyACM0
root@rk3288:/data/data/com.termux/files/home # ls -l /dev/ttyACM0
crw-rw-rw- root     root     166,   0 1970-01-01 02:00 ttyACM0
root@rk3288:/data/data/com.termux/files/home # cat /dev/ttyACM0
$GPRMC,080914.00,A,4427.18621,N,02612.68530,E,0.381,,270818,,,A*7C

$GPVTG,,T,,M,0.381,N,0.706,K,A*28

$GPGGA,080914.00,4427.18621,N,02612.68530,E,1,06,1.22,82.4,M,34.8,M,,*68

$GPGSA,A,3,25,26,16,21,29,05,,,,,,,2.32,1.22,1.97*06

$GPTXT,01,01,01,NMEA unknown msg*58

$GPGSV,3,1,10,04,71,278,28,05,20,046,25,16,30,313,15,20,20,176,*7C

$GPGSV,3,2,10,21,72,232,21,25,23,151,11,26,56,295,28,27,02,283,*71

$GPGSV,3,3,10,29,52,075,28,31,22,233,*7C

$GPGLL,4427.18621,N,02612.68530,E,080914.00,A,A*6B

$GPTXT,01,01,02,u-blox ag - www.u-blox.com*50

$GPTXT,01,01,02,HW  UBX-G70xx   00070000 *77

$GPTXT,01,01,02,ROM CORE 1.00 (59842) Jun 27 2012 17:43:52*59

$GPTXT,01,01,02,PROTVER 14.00*1E

$GPTXT,01,01,02,ANTSUPERV=AC SD PDoS SR*20

$GPTXT,01,01,02,ANTSTATUS=OK*3B

$GPTXT,01,01,02,LLC FFFFFFFF-FFFFFFFD-FFFFFFFF-FFFFFFFF-FFFFFFFD*2E

So, everything it's Ok and gps is working fine!

BUT, if I reboot, the permission for /dev/ttyACM0 disappear and return to 
crw------- root     root     166,   0 1970-01-01 02:00 ttyACM0 , and the gps is not locate me !
 This is my last problem!
To give permanent permission for /dev/ttyACM0
Thank you!

[Im4Tinker]

You should find a way to create a udev rule which will define the permission to that device.

[YoZa]

Please , tell me how!

[lobo]

Dear YoZa, I updated my first post last days with complete installation steps including alternative 1 as install-recovery-2.sh and alternative 2 as uevent.rk30board.rc modifying. Please take a look. But alternative 2 is complicated for not experienced user.
I see in your last post that you are on the right way! Now it is missing that install-recovery.sh and install-recovery-2.sh are executed.
Maybe something is broken on your installation. The install-recovery.sh is part of the SuperSU, as you told that you have installed. Probably you should install SuperSU once more and it could repair it.

[Im4Tinker]

Please , tell me how!

It seems to me you haven't seen my posted link.
You should do as follow:

• write this script
  
  Code:

  #!/bin/bash

KERNEL=$(udevadm info --attribute-walk -n /dev/ttyUSB0 |grep -m1 KERNEL)
SUBSYSTEM=$(udevadm info --attribute-walk -n /dev/ttyUSB0 |grep -m1 SUBSYSTEM)
VendID=$(udevadm info --attribute-walk -n /dev/ttyUSB0 |grep -m1 ATTRS{idVendor}==)
ProdID=$(udevadm info --attribute-walk -n /dev/ttyUSB0 |grep -m1 ATTRS{idProduct}==)

echo $KERNEL, $SUBSYSTEM, $VendID, $ProdID, MODE=0666 >/tmp/10-insertACM0.rules
• Save it as /tmp/make_the_rule.bash
  
• change the permission to execute it
  
  Code:

  chmod 755 /tmp/make_the_rule.bash
• run it
  
  Code:

  /tmp/make_the_rule.bash
• verify the result, which should be like
  Code:

  KERNEL=="ttyACM0", SUBSYSTEM=="tty", ATTRS{idVendor}=="VVVV", ATTRS{idProduct}=="PPPP", MODE=0666
  VVVV it should be the vendorID and PPPP the productID in hexadecimal, which I cannot guess .
  
• Last, you should copy to /etc/udev/rules.d/
  Code:

  $ sudo cp /tmp/10-insertACM0.rules /etc/udev/rules.d/

It should work as you plug the device to the system. If it isn't possible to plug, then reboot is required.

[YoZa]

Hi !
Lobo you were right!
I installed everything for the beginning, and now GPS works, but just outside!
Thank you very much for all your support!
I still have to install 6.5 inch touchscreen and CAN-BUS module, and my project is almost done!

[kisyabrus]

Hi, Lobo. I make config on my TB with root. All fine, but have some trouble. Gps starts ok, gps test look few satellites, but when i change a tab to position with N-E all tb freezes. Gps status show 3d fix. But position not show. I have a usb gps mous like a u blox 8 and use v4 driver. What it can be?

[lobo]

Please try to get a log when it freezes. But you should open a adb connection over usb cable (not tcpip) for that and give command 'adb shell logcat'. With some luck you can get some interesting messages. If it is a lot of data, you can make a zip of that and upload here.

To all user: Not easy to help without log!

[klavyesir]

Can you be more precise? I read all of messages but i couldnt get the correct order.

[sobrinho]

Hi there,

The driver is working perfectly on Nougat but I'm not able to root the Android (I tried several different ways and none of them worked).

I also tried the alternative 2 but for whatever reason, my board doesn't reboot in bootloader mode, it turns off when I try `adb reboot bootloader`.

Any alternatives?