USB setup on Linux

Correction made on 7 May 2019 by Kazuyuki Takeda
Minor correction on 15 Oct 2018 by Kazuyuki Takeda
Updated on 12 Oct 2018 by Kazuyuki Takeda
Updated on 25 Aug 2018 by Kazuyuki Takeda
Created on 26 Apr 2018 by Kazuyuki Takeda

Installing FTDI D2XX Driver

• Download the linux d2xx driver from FTDI.
• Open a terminal and go to the directory in which you have downloaded the above driver.
• tar xvzf libftftd2xx-x86_64-1.4.6.tgz.
• Go to the build directory.
• sudo cp libftd2xx.* /usr/local/lib.
• sudo chmod 0755 /usr/local/lib/libftd2xx.so.1.4.6.
• sudo ln -sf /usr/local/lib/libftd2xx.so.1.4.6 /usr/local/lib/libftd2xx.so.
• If you need to build the opencore NMR software from source, you also need to copy the header files. Go up the directory and copy ftd2xx.h and WinTypes.h to /usr/local/include.
• Whenever you plug in the USB cable, you need to run sudo rmmod ftdi_sio, but in the following I describe how to let the computer do it automatically on the event of plug-in.

(new) Plug and play on Linux (16 Oct 2018)

• Open a terminal.
• Run lsusb.
• Find the line in the message containing Future Technology Devices International, Ltd ....
• In this line there should be a label something like: Bus 001 Device 008: ID 0403:6010 (numbers can be different).
• Go to /etc/udev/rules.d/, and make a new text file with a name of, say, opencoreNMR.rules.
• One easy way to do so is sudo vi opencoreNMR.rules. Then, write as follows:

   ACTION=="add",ATTRS{idVendor}=="0403",ATTRS{idProduct}=="6010",MODE="0666",RUN+="/sbin/rmmod ftdi_sio",OPTIONS="last_rule"
  

• Be sure to use ATTRS{idVendor} and ATTRS{idProduct}. Do not use ATTR{idVendor} and ATTR{idProduct} (note the latter does not include “S”), otherwise I found out that RUN+=... does not work.
• The points are (i) mode 666 (read and write permission for all), and (ii) implementation of rmmod ftdi_sio.
• Tell the change made to the computer by: sudo udevadm control --reload-rules && udevadm trigger
• Then, when the USB cable is plugged, you can have an access to the spectrometer.

(obsolete) Non-root access to FTDI USB devices on linux

• Open a terminal.
• We assume that we already have disabled the default FTDI module by sudo rmmod ftdi_sio.
• Run lsusb.
• Find the line in the message containing Future Technology Devices International, Ltd ....
• In this line there should be a label something like: Bus 001 Device 008: ID 0403:6010 (numbers can be different).
• In this example, (i.e., if you got BUS 001), go to /dev/bus/usb/001, and sudo chmod a+w ./008.
• Then, you should be able to implement the opencore NMR software and establish connection with the spectrometer without root privilege.

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