MX-V Modem

Overview

The MX-V has a modem from Quectel called EG25 with a GPS receiver.

Starting/Enabling modem

The modem is turned off by default. To enable it, set the GPIO control line to 1.

root@mxv-pt:~# gpioinfo modem_control
gpiochip8 - 4 lines:
    line   0: "MODEM_ENABLE_ON" unused input active-high
    line   1: "MODEM_RESET" unused input active-high
    line   2: "MODEM_POWER_ENABLE" unused input active-high
    line   3: "MODEM_STATUS_ON" unused input active-high

To find out if the modem is on, read the MODEM_STATUS_ON GPIO.

root@mxv-pt:~# gpioget $(gpiofind MODEM_STATUS_ON)
0

Set MODEM_ENABLE_ON to 1:

gpioset $(gpiofind MODEM_ENABLE_ON)=1

• The modem takes about 10 seconds to start and register itself with the kernel. It then takes up to one minute before it is registered in the linux usb list.
• Check USB TTY device to see if it has shown up.

find /dev -name "ttyUSB*"

/dev/ttyUSB3
/dev/ttyUSB2
/dev/ttyUSB1
/dev/ttyUSB0

• The modem also shows up with the lsusb command.

root@mxv-pt:~# lsusb | grep Quectel
Bus 001 Device 006: ID 2c7c:0125 Quectel Wireless Solutions Co., Ltd. EC25 LTE modem

Production settings(default)

• Sim card detect
• AT+QSIMDET=1,1
  • Need restart to take affect
• AT+QSIMSTAT?
  • 0 Off, 1 On first parameter
• Audio codec (TLV320AIC3104)
• AT+QDAI=5,0,0,4,0,1
• GPS (not confirmed)
• AT+QGPSCFG="autogps",1
• AT+QGPSCFG="nmeasrc",1
• Activate diversity antenna
• AT+QCFG="diversity" 1

Test SIM card

GPS

Use WvDial to get a broadband connection

Audio