Solve MicroPhase E310 UHD & Linux Issues: Troubleshooting Top Errors

1. UHD Does Not Detect E310

• Verify network interface: ensure your PC’s Ethernet adapter is set to 1000 Mbps Full Duplex and configured with a static IP (e.g., 192.168.1.100/24, gateway 192.168.1.1).
• Ping test: run ping 192.168.1.10 to confirm basic connectivity.
• Force discovery: use uhd_find_devices --args "addr=192.168.1.10".
• Reinstall drivers: sudo apt install uhd-host libuhd-dev, rebuild MicroPhase UHD extensions (cmake . && make && sudo make install && sudo ldconfig).

2. Flowgraph Freezes or Buffer Underruns

• Reduce sample rate to ≤5 Msps until stable.
• Increase buffer sizes: export UHD_BUFFERS=32768 or set in GNU Radio block properties.
• Close competing processes to free CPU and memory.
• Blacklist conflicting kernel modules: add blacklist uvcvideo to /etc/modprobe.d/blacklist.conf.

3. Permission Denied on UHD or Ethernet

• Install UHD udev rules: place 99-uhd.rules in /etc/udev/rules.d/ and reload rules (sudo udevadm control --reload-rules).
• Add user to netdev group: sudo usermod -aG netdev $USER, then log out/in.
• Verify /dev/uhd* permissions allow user access.

4. High Latency or Packet Loss

• Enable jumbo frames: set MTU to 9000 on Ethernet interface and switch ports.
• Configure IRQ affinity: bind network interrupt to a dedicated CPU core via /proc/irq/*/smp_affinity.
• Disable power management: add wifi.powersave = 2 to /etc/NetworkManager/conf.d/ and reboot.

5. Firmware Version Mismatch

• Check firmware: run uhd_usrp_probe to display firmware version.
• Update firmware: download latest image from MicroPhase GitHub and copy to SD card root.
• Reboot and verify: ensure host UHD version matches firmware series.

6. GNU Radio Companion Crashes

• Create isolated environment: use Conda or Docker with pinned gnuradio and uhd versions.
• Disable heavy GUI sinks: switch to CPU-based QT sinks instead of OpenGL if crashes occur.
• Lower sample rates and remove non-essential blocks to isolate problem areas.

7. USB-UART Connection Issues

• Load drivers: sudo modprobe ftdi_sio and sudo modprobe usbserial.
• Set permissions: add your user to dialout group for access to /dev/ttyUSB*.
• Use reliable terminal: launch console with screen /dev/ttyUSB0 115200 -L to view boot logs.

8. Environment & Best Practices

• Keep system updated: sudo apt update && sudo apt upgrade.
• Use dedicated network interface: avoid shared or managed switches for E310 traffic.
• Document configuration: record working network settings, UHD/firmware versions, and sample rates.
• Perform periodic reboots after updates to ensure clean state.

Additional Troubleshooting Commands

• Verbose UHD logging: export UHD_LOG_LEVEL=debug.
• Check network stats: ethtool eth0 to verify link speed and duplex.
• Inspect system logs: journalctl -f during startup and operation.

When to Contact Support

• Persistent network detection failures across multiple hosts.
• Firmware corruption not resolved by SD-based updates.
• Hardware faults indicated by console errors or no LED activity.

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