I am trying to plug in a device into my Macbook and connect to it to read it's serial port. I know the device connects on baudrate 115200.
Currently, I run the command
ioreg -p IOUSB -l -b | grep -E "@|PortNum|USB Serial Number"
I can see the embedded device plugged in
+-o Root Hub Simulation Simulation@14000000
| +-o iBridge@14200000
| | "PortNum" = 2
| +-o USB2.0 Hub@14100000
| | "PortNum" = 1
| +-o 4-Port USB 2.0 Hub@14120000
| | | "PortNum" = 2
| | +-o MBED CMSIS-DAP@14122000
| | "PortNum" = 2
| | "USB Serial Number" = "024002267822ce0a00000000000000000000000085fb33b2"
| +-o USB Keyboard @14110000
| "PortNum" = 1
| "USB Serial Number" = "0000000000000001"
note: There's a tag close to
<class AppleUSBDevice, id 0x100014343, registered, matched, active, busy 0 (363 ms), retain 33>
next to every device's name above, but I removed them for formatting issues (as I don't think they're related to the question). In the event they are, that is the tag for my embedded device).
The Question
How would I find out the MBED device's association in /dev/?
I am trying to find the device MBED CMSIS-DAP@14122000 inside the /dev/ directory, so that I can read its serial output. This is where I am lost.
The end goal is that I could use screen or putty or something similar to:
screen /dev/ttyTHIS_MBED_DEVICE 115200
So, I actually found the answer.
To find out what the device name is, I did an ls of the /dev/ directory with the device plugged in and then with it disconnected.
ls -lha /dev/tty* > plugged.txt
ls -lha /dev/tty* > np.txt
Then I compared the files using
vimdiff plugged.txt np.txt
And saw the line
crw-rw-rw- 1 root wheel 19, 30 Jan 16 15:24 /dev/tty.usbmodem145222
Sure enough, the device is named tty.usbmodem145222!
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