Accessors Wiki | Notes / MacOSMissingTTYPort

When connecting a Hail or Edison then the devices are plugged in to the USB port for programming.

If the device is connected, then you should see:

bash-3.2$ ls -ltr /dev/tty* | tail
crw-rw-rw- 1 root wheel 4, 4 Feb 23 10:44 /dev/ttyp4
crw-rw-rw- 1 root wheel 4, 3 Feb 23 10:44 /dev/ttyp3
crw-rw-rw- 1 root wheel 4, 2 Feb 23 10:44 /dev/ttyp2
crw-rw-rw- 1 root wheel 4, 1 Feb 23 10:44 /dev/ttyp1
crw-rw-rw- 1 root wheel 4, 0 Feb 23 10:44 /dev/ttyp0
crw-rw-rw- 1 root wheel 20, 0 Feb 23 10:44 /dev/tty.Bluetooth-Incoming-Port
crw-rw-rw- 1 root wheel 20, 2 Feb 23 10:44 /dev/tty.usbserial-ANZ1R15T
crw--w---- 1 cxh tty 16, FTI 1 Feb 23 10:45 /dev/ttys001
crw-rw-rw- 1 root wheel 2, 0 Feb 23 10:45 /dev/tty
crw--w---- 1 cxh tty 16, 0 Feb 23 10:45 /dev/ttys000
bash-3.2$

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If ls -l /dev/tty* | tail is not showing the /dev/tty.ucbserial* port, then read on.

Apparently, recent versions of the com.FTDI driver seem to slowly kill the serial port. One solution is to remove that driver:

Check that the FTDI driver is installed:

bash-3.2$ kextstat | grep FTDI
138 0 0xffffff7f82e4d000 0x8000 0x8000 com.FTDI.driver.FTDIUSBSerialDriver (2.2.18) 638ECCC3-375D-CD1A-C2EC-0DC14740FC9C <119 39 5 4 3 1>

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Unplug the USB ports
Look for the driver file:

bash-3.2$ find /System/Library/Extensions -name "*FTDI*"
/System/Library/Extensions/AppleUSBFTDI.kext
/System/Library/Extensions/AppleUSBFTDI.kext/Contents/MacOS/AppleUSBFTDI
/System/Library/Extensions/EnergiaFTDIDrivers2.2.18.pkg
/System/Library/Extensions/FTDI Installer.pmdoc
/System/Library/Extensions/FTDIUSBSerialDriver.kext

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Unload the FTDIUSBSerialDriver.kext not sure about this command:

kextunload /System/Library/Extensions/FTDIUSBSerialDriver.kext

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Check that it is unloaded

bash-3.2$ kextstat | grep FTDI

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Move the file elsewhere

sudo mv /System/Library/Extensions/FTDIUSBSerialDriver.kext /root/

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Reboot