EC25-E and GPS driver for Android (MiniPCIe connection)

byzmiter · April 3, 2025, 7:52am

Hi everyone, I need help. I have such a device Jewelled JLD039_3G_V1.2, CPU Amlogiс AML8726-M8 4x ARM Cortex-A9 (32bit), Android 4.4. The EC25-E modem is installed in the miniPCIe connector on the board.

I downloaded the drivers Quectel_Android_GPS_Driver_V2.2.2_beta, and replaced files according to instructions:
Add the following GNSS driver files, gps_cfg.inf and gps.default.so,to Android system:

For Android versions prior to Android 8.0

For 32-bit Android system
gps_cfg.inf → /system/etc
gps.default.so → /system/lib/hw

But the device still does not see satellites.

‘logcat –s gps_ql –v time’ I get the following information:

If NMEA_PORT_PATH=rild-nmea
04-02 09:35:05.640 D/gps_ql (439): Error connecting rild-nmea (Connection refused)
04-02 09:35:05.640 D/gps_ql (439): fail to open GPS channel !

If NMEA_PORT_PATH=/dev/tty01
04-02 09:12:32.250 D/gps_ql (437): GPS channel </dev/tty01> not exist. errno: 2 (No such file or directory)

If NMEA_PORT_PATH=/dev/ttyUSB0:
04-02 10:24:25.790 D/gps_ql (438): GPS channel </dev/ttyUSB0> not exist. errno: 13 (Permission denied)

When I launch GPSTest.app, for example If NMEA_PORT_PATH=/dev/ttyUSB0:

04-02 10:24:24.010 D/gps_ql (438): ql_gps_set_position_mode(mode=0, recurrence=0, min_interval=1000, preferred_accuracy=0, preferred_time=0)
04-02 10:24:24.010 D/gps_ql (438): ql_gps_start()
04-02 10:24:24.010 D/gps_ql (438): ql_gps_start: gps_state is 3!
04-02 10:24:24.010 D/gps_ql (438): ql_gps_start: called
04-02 10:24:24.010 D/gps_ql (438): ql_gps_state_start[234]–enter!
04-02 10:24:24.790 D/gps_ql (438): GPS channel </dev/ttyUSB0> not exist. errno: 13 (Permission denied)
04-02 10:24:25.790 D/gps_ql (438): GPS channel </dev/ttyUSB0> not exist. errno: 13 (Permission denied)
04-02 10:24:26.790 D/gps_ql (438): GPS channel </dev/ttyUSB0> not exist. errno: 13 (Permission denied)
04-02 10:24:27.790 D/gps_ql (438): GPS channel </dev/ttyUSB0> not exist. errno: 13 (Permission denied)
04-02 10:24:28.790 D/gps_ql (438): GPS channel </dev/ttyUSB0> not exist. errno: 13 (Permission denied)
04-02 10:24:29.560 D/gps_ql (438): ql_gps_stop()
04-02 10:24:29.560 D/gps_ql (438): ql_gps_stop: called
04-02 10:24:29.560 D/gps_ql (438): ql_gps_state_stop[240]–enter!
04-02 10:24:29.570 D/gps_ql (438): report_gps_state enter
04-02 10:24:29.570 D/gps_ql (438): reportStatus GPS_STATUS_SESSION_END
04-02 10:24:29.570 D/gps_ql (438): report_gps_state leave
04-02 10:24:29.570 D/gps_ql (438): report_gps_state enter
04-02 10:24:29.570 D/gps_ql (438): reportStatus to GPS_STATUS_ENGINE_OFF
04-02 10:24:29.570 D/gps_ql (438): report_gps_state leave

Please tell me what I’m doing wrong? What parameters I need to write in the file gps_cfg.inf ? Thank you!

P.S. I checked the modem via USB adapter on PC by Qnavigator_V1.5 - it is configured, sees satellites and catches mobile network.

byzmiter · April 3, 2025, 11:13am

More data:
root@k100_6212:/ # getprop | grep phone
[gsm.current.phone-type]: [1]
[hw.nophone]: [false]
root@k100_6212:/ # getprop | grep ril
[gsm.version.ril-impl]: [Quectel_Android_RIL_SR01A40V45]
[init.svc.ril-daemon]: [running]
root@k100_6212:/ # getprop | grep gps
[gps.enable]: [false]
root@k100_6212:/ # getprop | grep gnss
1|root@k100_6212:/ #

As I understand it, the device does not see the GPS driver. The RIL driver was already installed on the device.
[gsm.version.baseband]: [EC25EFAR02A09M4G]

Bean.Wang-Q · April 3, 2025, 12:16pm

Hi byzmiter

Is there 4 ttyUSB?
The /dev/ttyUSB1 is the nmea port.
Maybe you can set it to /dev/ttyUSB1 first.
And make sure it have the correct access permisstion.
chmod 777 /dev/ttyUSB1

byzmiter · April 4, 2025, 6:25am

Hi, Bean.Wang-Q
Thank you for responding
Information on my USB ports:

root@k100_6212:/ # lsusb
Bus 001 Device 002: ID 05e3:0608
Bus 001 Device 001: ID 1d6b:0002
Bus 002 Device 001: ID 1d6b:0002
Bus 001 Device 003: ID 046d:c31c
Bus 001 Device 004: ID 2c7c:0125
root@k100_6212:/ # dmesg | grep tty
<5>[ 0.000000@0] Kernel command line: init=/init console=ttyS4,115200n8 no_console_suspend logo=osd1,loaded,panel,debug storage=2 androidboot.firstboot=0
<6>[ 0.000000@0] console [ttyS4] enabled
<5>[ 0.387604@0] start uart_ao_ttyS0:(irq = 122)
<5>[ 0.387963@0] start uart_a_ttyS1:(irq = 58)
<5>[ 0.388318@0] start uart_b_ttyS2:(irq = 107)
<5>[ 0.388580@0] start uart_d_ttyS4:(irq = 126)
<7>[ 1.512623@0] config uart_d_ttyS4:: Character length 8bits/char
<6>[ 1.527142@0] Changing uart_d_ttyS4: baud from 0 to 115200
<7>[ 3.980744@1] config uart_d_ttyS4:: Character length 8bits/char
<7>[ 4.386834@2] config uart_d_ttyS4:: Character length 8bits/char
<6>[ 13.089965@0] usb 1-1.4: GSM modem (1-port) converter now attached to ttyUSB0
<6>[ 13.107778@0] usb 1-1.4: GSM modem (1-port) converter now attached to ttyUSB1
<6>[ 13.119385@0] usb 1-1.4: GSM modem (1-port) converter now attached to ttyUSB2
<6>[ 13.137983@0] usb 1-1.4: GSM modem (1-port) converter now attached to ttyUSB3
<6>[ 13.147645@0] usb 1-1.4: GSM modem (1-port) converter now attached to ttyUSB4
root@k100_6212:/ # ls /dev/ttyUSB*
/dev/ttyUSB0
/dev/ttyUSB1
/dev/ttyUSB2
/dev/ttyUSB3
/dev/ttyUSB4

Unfortunately the command ‘chmod 777 /dev/ttyUSB1’ is not processed:

u0_a70@k100_6212:/ $ chmod 777 /dev/ttyUSB1
Unable to chmod /dev/ttyUSB1: Operation not permitted
u0_a70@k100_6212:/ $ su
root@k100_6212:/ # chmod 777 /dev/ttyUSB1
root@k100_6212:/ #

What else can I do? Thank you

byzmiter · April 4, 2025, 12:37pm

Sorry, the command ‘chmod 777 /dev/ttyUSB1’ worked.
root@k100_6212:/ # ls -l /dev/ttyUSB*
crw-r----- radio radio 188, 0 2025-04-04 14:34 ttyUSB0
crwxrwxrwx radio radio 188, 1 2025-04-04 14:34 ttyUSB1
crw-r----- radio radio 188, 2 2025-04-04 15:22 ttyUSB2
crw-r----- radio radio 188, 3 2025-04-04 14:35 ttyUSB3
crw-r----- radio radio 188, 4 2025-04-04 14:34 ttyUSB4

But nothing changed:
root@k100_6212:/ # logcat -s gps_ql
--------- beginning of /dev/log/system
--------- beginning of /dev/log/main
D/gps_ql ( 438): GPS channel </dev/ttyUSB1> not exist. errno: 13 (Permission denied)

Bean.Wang-Q · April 4, 2025, 1:35pm

Do you have the source code of the Android 4.4?
You can add the code in the uevent.rc or initial script add give the /dev/ttyUSB1 the access permission.

byzmiter · April 4, 2025, 2:03pm

Unfortunately no. The board manufacturer did not provide the firmware.

byzmiter · April 5, 2025, 9:14am

I set 666 rights (chmod 666 /dev/ttyUSB1) and finally connected to the port.
crw-rw-rw- radio radio 188, 1 2025-04-05 11:58 ttyUSB1

Now I have the following data:
root@k100_6212:/ # logcat -s gps_ql
--------- beginning of /dev/log/system
--------- beginning of /dev/log/main
D/gps_ql ( 438): GPS channel </dev/ttyUSB1> not exist. errno: 13 (Permission denied)
D/gps_ql ( 438): ql_gps_set_position_mode(mode=0, recurrence=0, min_interval=1000, preferred_accuracy=0, preferred_time=0)
D/gps_ql ( 438): ql_gps_start()
D/gps_ql ( 438): ql_gps_start: gps_state is 3!
D/gps_ql ( 438): ql_gps_start: called
D/gps_ql ( 438): ql_gps_state_start[240]–enter!
D/gps_ql ( 438): deal_cmd[206]–enter and cmd is 1!
D/gps_ql ( 438): deal_cmd[228]–exit!
D/gps_ql ( 438): ql_gps_state_start[242]-- after enter!
D/gps_ql ( 438): ql_gps_start: after called
D/gps_ql ( 438): GPS channel </dev/ttyUSB1> not exist. errno: 13 (Permission denied)
D/gps_ql ( 438): GPS channel </dev/ttyUSB1> not exist. errno: 13 (Permission denied)
D/gps_ql ( 438): ql_gps_stop()
D/gps_ql ( 438): ql_gps_stop: called
D/gps_ql ( 438): ql_gps_state_stop[247]–enter!
D/gps_ql ( 438): deal_cmd[206]–enter and cmd is 2!
D/gps_ql ( 438): deal_cmd[228]–exit!
D/gps_ql ( 438): report_gps_state enter
D/gps_ql ( 438): reportStatus GPS_STATUS_SESSION_END
D/gps_ql ( 438): report_gps_state leave
D/gps_ql ( 438): report_gps_state enter
D/gps_ql ( 438): reportStatus to GPS_STATUS_ENGINE_OFF
D/gps_ql ( 438): report_gps_state leave
D/gps_ql ( 438): GPS channel </dev/ttyUSB1> not exist. errno: 13 (Permission denied)
D/gps_ql ( 438): GPS channel </dev/ttyUSB1> not exist. errno: 13 (Permission denied)
D/gps_ql ( 438): GPS channel </dev/ttyUSB1> not exist. errno: 13 (Permission denied)
D/gps_ql ( 438): open GPS channel </dev/ttyUSB1> successful!
D/gps_ql ( 438): ql_gps_set_position_mode(mode=0, recurrence=0, min_interval=1000, preferred_accuracy=0, preferred_time=0)
D/gps_ql ( 438): ql_gps_start()
D/gps_ql ( 438): ql_gps_start: gps_state is 3!
D/gps_ql ( 438): ql_gps_start: called
D/gps_ql ( 438): ql_gps_state_start[240]–enter!
D/gps_ql ( 438): deal_cmd[206]–enter and cmd is 1!
D/gps_ql ( 438): deal_cmd[228]–exit!
D/gps_ql ( 438): ql_gps_state_start[242]-- after enter!
D/gps_ql ( 438): ql_gps_start: after called
D/gps_ql ( 438): ql_gps_stop()
D/gps_ql ( 438): ql_gps_stop: called
D/gps_ql ( 438): ql_gps_state_stop[247]–enter!
D/gps_ql ( 438): deal_cmd[206]–enter and cmd is 2!
D/gps_ql ( 438): deal_cmd[228]–exit!
D/gps_ql ( 438): report_gps_state enter
D/gps_ql ( 438): reportStatus GPS_STATUS_SESSION_END
D/gps_ql ( 438): report_gps_state leave
D/gps_ql ( 438): report_gps_state enter
D/gps_ql ( 438): reportStatus to GPS_STATUS_ENGINE_OFF
D/gps_ql ( 438): report_gps_state leave

But GPS Test still does not see satellites.
And another nuance, when I reboot the device, the rights to ttyUSB1 are reset to default:
crw-r----- radio radio 188, 1 2025-04-05 12:58 ttyUSB1

Bean.Wang-Q · April 5, 2025, 4:10pm

You need send the AT+QGPS=1 via /dev/ttyUSB2 to enable the GPS.

byzmiter · April 5, 2025, 4:27pm

Please tell me how I can send an AT command via the terminal on Android?

Bean.Wang-Q · April 6, 2025, 9:21am

If you are using the Quectel RIL. You can add the AT+QGPS=1 in the ql-ril.conf


#LTE_SignalStrength=-1
#LTE_Is_Report_SignalStrength=1
At_Cmds_For_Customer_Initialize=AT+QGPS=1
#Icc_Constants=EF_ICCID
#support_CDMPhone=1
#URC_delay_mseconds=2000

byzmiter · April 7, 2025, 8:57am

Thank you, everything worked out, but not quite as you said. Editing ql-ril.conf did not give any result. I had to look for a way to enable GPS via the terminal. In addition, I also had to give ‘666’ rights to the ttyUSB2 port. As a result, the commands in the terminal look like this:
chmod 666 /dev/ttyUSB1
chmod 666 /dev/ttyUSB2
echo -ne “at+qgps=1\r” > /dev/ttyUSB2

The only question left is how to add all this to Android startup, since when rebooting, all rights are lost by default.

Bean.Wang-Q · April 7, 2025, 9:11am

Please check whether you are using the Quectel RIL. If you are using the Quectel RIL you can add the command in the ql-ril.conf.

Bean.Wang-Q · April 7, 2025, 9:12am

Or maybe you can try the AT command
AT+QGPSCFG="autogps",1
to enable the GPS by default. It will take effect after reboot.

byzmiter · April 7, 2025, 9:57am

I don’t know if I’m using Quectel RIL, but when I query it in the terminal I get this information:
root@k100_6212:/ # getprop | grep ril
[gsm.version.ril-impl]: [Quectel_Android_RIL_SR01A40V45]
[init.svc.ril-daemon]: [running]

As I understand it, RIL drivers are installed, but the configuration file ql-ril.conf was missing in /system/etc and I had to add it. But as I wrote above, this did not change anything, and I had to enable GPS manually in the terminal with the command ‘echo -ne “at+qgps=1\r” > /dev/ttyUSB2’, which I found in one of the topics on this forum.

Bean.Wang-Q · April 7, 2025, 10:40am

If you cannot modify compile the Android source code, we cannot guarantee it would work.

You can try

AT+QGPSCFG="autogps",1
echo -ne "AT+QGPSCFG=\"autogps\",1\r" > /dev/ttyUSB2