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September 25, 2025 19:06
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LimeSDR Mini v2.4 (How to use analog clock switch)
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| So here’s how to use udev to always enable the external reference by default, for the LimeSDR Mini v2.4 (October 2024): | |
| 1. edit /etc/udev/rules.d/65-limesuiteng-usb.rules. | |
| 2. find the line that says: | |
| ACTION=="add", SUBSYSTEM=="usb", ATTR{idVendor}=="0403", ATTR{idProduct}=="601f", MODE=="666" | |
| 3. At the end of that line, add: | |
| , RUN+="/usr/local/bin/limeSPI --device '0403:601f' --chip FPGA write -s 00cf0001" | |
| 4. save, exit, and run sudo /etc/init.d/udev restart | |
| 5. unplug+replug the usb for the sdr | |
| 6. check that udev actually did what we told it to: | |
| limeSPI --device "0403:601f" --chip FPGA read -s 00cf | |
| …and it should print out: 00cf0001, and limeGUI should also report 0001 for this register :partying_face: :tada: | |
| To ‘permanently’ switch back to the internal reference, you can comment out the , RUN+=.... portion that we added (you’ll also need to restart udev as above, and unplug and replug your device). To ‘temporarily’ switch back to internal, just execute /usr/local/bin/limeSPI --device '0403:601f' --chip FPGA write -s 00cf0000. | |
| I hope this information helps someone in the future. And thanks for your time! | |
| ------ | |
| This is a copy of a post made by user "Ian" (https://discourse.myriadrf.org/u/ian/) on the myriadrf forums. I've only made this in case the original post is deleted / lost, as it helped me get my LimeSDR setup with a GPSDO. Thanks Ian! | |
| Original Post: https://discourse.myriadrf.org/t/limesdr-mini-v2-4-external-clock/8203/9 |
Author
Author
Fwiw - for me limeSPI is located at /usr/bin/limeSPI on Debian 13. I referenced that path instead within the 65-limesuiteng-usb.rules file.
Author
Also - to set custom udev rules, copy from installed package udev rules to custom rules like so:
sudo cp /lib/udev/rules.d/65-limesuiteng-usb.rules /etc/udev/rules.d/
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https://limesuiteng.myriadrf.org/gettingstarted/common/clitools#limespi
docs for the limespi command / installation.