![]() The devices appeared in my USB device tree (System Information -> Hardware -> USB), but did not show up as a serial device using Arduino, or Coolterm. The install will succeed, BUT due to Apples built-in FTDI drivers they will not work.Ģ) Reboot computer and enter recovery mode Via powering down and holding down CMD + R on reboot.ģ) In recovery mode open terminal from utilities at the top of the screen and type the following to tempraily disable System Integrity Protection: NOTE: they did not appear either when in Terminal with the command (ls /dev/cu*) or (ls /dev/tty*)ģ) Download the 2.4.2 drivers from FTDI's website and install. Sudo mv D2zzHelper.kext D2xxHelper.disabled Sudo mv AppleUSBFTDI.kext AppleUSBFTDI.disabled The computer will prompt you to reboot to make changes take effect.Ĥ) On reboot we now need to disable the Apple FTDI drivers (NOTE: this can be reversed at any time so do not worry). Now you will have successfuly have disabled Apple's built-in FTDI drivers and replaced them with FTDI v2.4.ĥ) Restart your computer in recovery mode. COOLTERM ARDUINO MAC SERIALĮnter the following to reenable Apple's System Integrity ProtectionĪT LAST! One final restart and then your USB serial devices should all be loading properly! Shutdown, hold Command + R and open terminal in the Utilities tab. **NOTE: I have tested this on a 2016 Macbook Pro with MacOS 10.13.3 on the following devices/apps: 1) Screen from within terminal, CoolTerm, Bus Pirate V3.6, JTAGulator, Arduino Uno, Adafruit Mega AT, Arduino Mega clone. I had the same issue, albeit on Sierra, talking to an Arduino Nano clone (which also uses a FTDI FT232RL bridge). What seems to have worked for me is actually removing the FTDI driver ( /Library/Extensions/FTDIUSBSerialDriver.kext), after finding that Apple ships an FTDI driver with the OS itself ( /System/Library/Extensions/AppleUSBFTDI.kext). I think having both drivers active at the same time causes a conflict, which ties up the USB port. I'd like to provide an additional answer that solves one more piece of the puzzle that I had. Even following Garrett Johnson's excellent answer above, my FTDI driver was still not working. It turned out that - and I know this sounds insane - that my System Preferences "Security & Privacy" tab was not accepting my trackpad's click on the "Allow" button that would allow the driver to load. I got down this path after seeing this message in install log: 16:21:04-04 host installd: kextcache: Kext rejected due to system policy: COOLTERM ARDUINO MAC DRIVER Of course, I clicked "Allow" in there, but nothing seemed to happen. The button registered the click, but I didn't have any window pop up or anything else for some form of confirmation. Searching around the Internets, I discovered this lengthy thread on Karabiner's github page discussing several solutions for forcing System Preferences to permit the mouse click:Īpparently I had some software running that was intercepting the trackpad activity. It wasn't chrome in my case, unlike several people on that list.
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