Merge #153

153: Clarify how to locate FTDI device on macOS r=korken89 a=johnthagen

I've gone through this guide once or twice and this has tripped me up several times. On mac you shouldn't try to locate the FTDI device using `dmesg`, but the previous guide seemed to lead you to that.

I've moved the mac note higher in the docs as well as provided a command to actually find it on macOS.

Co-authored-by: johnthagen <[email protected]>

Author: bors[bot]

src/10-serial-communication/nix-tooling.md

@@ -2,15 +2,16 @@
 
 Connect the serial module to your laptop and let's find out what name the OS assigned to it.
 
+> **NOTE** On macs, the USB device will named like this: `/dev/cu.usbserial-*`. You won't
+> find it using `dmesg`, instead use `ls -l /dev | grep cu.usb` and adjust the following 
+> commands accordingly!
+
 ``` console
 $ dmesg | grep -i tty
 (..)
 [  +0.000155] usb 3-2: FTDI USB Serial Device converter now attached to ttyUSB0
 ```
 
-> **NOTE** On macs, the USB device will named like this: `cu.usbserial-*`.  Adjust the following
-> commands accordingly!
-
 But what's this `ttyUSB0` thing? It's a file of course! Everything is a file in *nix:
 
 ``` console