USB OTG Testing

2025-05-20

The qusb command configures USB working modes. Supported parameters for qusb are as follows:

init	Initialize USB configuration (mount configfs, create device nodes, load default PID)
bind	Bind USB device to configuration (activate current configuration)
unbind	Unbind USB device (deactivate current configuration)
setpid <PID>	Switch to USB composite mode with specified PID (e.g., setpid 901D enables DIAG+ADB)
setpid -p <PID>	Set PID as default mode (persist to /etc/usb/usb_pid, takes effect after reboot)
showpid	Display all supported PIDs and their corresponding function combinations
persist <PID>	Persist PID only (without immediate switching)

Test USB NIC Emulation Features with qusb

  • View all supported USB features:

    root@qcm6490-idp:/# qusb showpid
A4A1: NCM
4EE7: ADB
900E: DIAG
901C: DIAG,UAC2
901D: DIAG,ADB
9015: MASS_STORAGE,ADB
9024: RNDIS,ADB
902A: RNDIS,MASS_STORAGE
902B: RNDIS,ADB,MASS_STORAGE
902C: RNDIS,DIAG
902D: RNDIS,DIAG,ADB
902F: RNDIS,DIAG,MASS_STORAGE
908C: NCM,ADB
90CA: DIAG,UAC2,ADB
90CB: DIAG,UVC,ADB
90CC: DIAG,UAC2,UVC,ADB
90DF: DIAG,UVC
90E0: DIAG,UAC2,UVC
9135: DIAG,QDSS,ADB
9136: DIAG,QDSS
F000: MASS_STORAGE
F00E: RNDIS

  • Switch USB mode: qusb setpid 908C #Enables NCM+ADB, then execute ifconfig -a in device shell to view usb0 interface

  • Connect QuecPi Alpha's Type-C interface to PC's USB interface [Linux OS is recommended for PC]

  • Configure IP address for QuecPi Alpha's usb0 interface: ip addr add dev usb0 192.168.0.5/24

  • Configure address for newly recognized USB NIC on PC: ip addr add dev enp0s20f0u13 192.168.0.6/24 #enp0s20f0u13 should be modified according to actual interface name

  • Network test: Execute ping 192.168.0.5 in PC's SHELL #Successfully pinging the destination address indicates proper network connectivity