FAQ

2025-09-27

Why can't I find the SLogic16U3 device?

No SLogic Device

The most common reason is that PulseView was started before the SLogic16U3 was connected. If the software can't see a device at startup it may not probe for it again automatically.

Solutions:

  1. For automatic detection, connect the SLogic16U3 first, then launch PulseView. The software should auto-detect the device on startup.
  2. If you started the software before connecting the SLogic, manually open the "Connect to Device" (or "Device Settings") dialog after plugging the SLogic in:
    • Open "Connect to Device".
    • Choose the correct driver/back-end for the SLogic16U3.
    • Click "Scan" to discover attached devices.
    • Select the SLogic device from the list and click "OK".
    • The UI will return to the normal capture/home page and the device will be available.
    • SLogic Found

Additionally, on Linux a normal user cannot access USB devices by default due to permission restrictions. Nothing Found
Choose one of the two methods below:

  • Run PulseView with root privileges (quick test):
sudo ./Pulseview.appimage

How do I set up udev rules for Linux?

Create a new udev rules file:

sudo tee /etc/udev/rules.d/60-sipeed.rules <<EOF
SUBSYSTEM!="usb|usb_device", GOTO="sipeed_rules_end"
ACTION!="add", GOTO="sipeed_rules_end"
ATTRS{idVendor}=="359f", MODE="0666", GROUP="plug_dev", TAG+="uaccess"
ENV{ID_MM_DEVICE_IGNORE}="1"
LABEL="sipeed_rules_end"
EOF

Reload udev rules and trigger:

sudo udevadm control --reload
sudo udevadm trigger

Unplug and reconnect the device.
You can now run Pulseview as a normal user.

Why can't I use higher sample rates? Only 200M shows.

The maximum sample rate depends on the number of active channels and USB bandwidth.
Slogic16U3's USB 3.0 provides up to ~400MB/s.
To use higher rates (400M/800M), disable unused channels.

The device is locked in DFU mode and cannot switch back to SLogic mode.

This usually means the SLogic firmware is corrupted, often due to a failed OTA update.
Solution: Re-flash the correct firmware via OTA.

Cannot switch to DFU mode, error shows "unknown USB device".

This indicates USB enumeration failure, often caused by poor-quality or overly long USB cables.
Solution: Try again with a shorter, higher-quality USB cable.