Working with ESP8266 and NodeMCU can be very easy, or very challenging! I’ve been fortunate to have good luck but I’ve fielded may questions from people that have been having trouble.
Considering that users update to OS X Yosemite from OS X Mavericks, hmm I suspect you did not even read the article here, describing how to make a USB installer drive for OS X Yosemite, from OS X Mavericks or OS X Yosemite, as long as you have the Yosemite installer downloaded. Make OS X Yosemite Bootable USB Installer Drive OS X 10.10 Recommended to use cloning software applications such as Mac Backup Guru, Super Duper, Carbon Copy Cloner to clone a backup that is bootable. The partition scheme and volume properties of your flash drive will vary depending on manufacturer and previous configuration. The traditional method of creating a bootable OS X USB installer no longer works, so you’ll need to follow a new approach when dealing with OS X Yosemite. While there are multiple methods that will work, here’s the easiest way to create a bootable OS X 10.10 Yosemite USB Installer for the Yosemite Public Beta.
If you are on a Mac (or Linux), unfortunately there are not as many GUI options as there are on Windows. There is however one solid option that has been my go to method.
Setting up the software environment
First things first, think about the hardware, it is important to know what UART interface that you plan to program with. I’m a FTDI guy, I’ve always had good luck with the parts, they might no be the cheapest but I’ve found that they keep there drivers up to date, and overall have great quality. (no comments on FTDI Gate)
ALWAYS be sure to update your drivers. Especially on Yosemite because Apple’s default is to use their own version of libftdi instead of the official FTDI VCP drivers. This for certain does not work with the FT232X series parts.
You may download the FTDI VCP drivers here and install them:
Other drivers that might be useful if you are not using FTDI are:
SiLabs
Prolific
Be advised that some low cost boards (including the official NodeMCU dev board) use a very cheap USB to UART chip, the driver can be found here:
Once you know that your UART is working, now it is time to install esptool.py
You may download esptool here:
Once downloaded, create a folder and place esptool.py inside
open the terminal application and navigate to this folder using cd
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You will also need to download the latest NodeMCU firmware binary from here:
There are two options for NodeMCU builds, one which includes floating point and one that does not. I highly recommend the binary without floating point because it does not leave much memory space for running code.
After download, place this bin file in the same folder.
esptool is written in python, as such it requires a working python environment. Luckily, OS X comes with Python pre-installed. pySerial is one dependency is not included but can be easily added using PIP.
You may install pySerial with the following command
Preparing the ESP8266
ESP8266 has a built in UART boot loader that is used to program new binaries. The boot loader is entered if GPIO0 is tied to GND when ESP8266 comes out of reset or is powered on. Most modules either have a push button or a pad where a wire my be soldered to. Use this pin/pad or button to tie GPIO0 to ground and power on the module.
CH_PD must be tied to VCC to be functional, this is equivalent to 'Chip Power Down”.
Some ESP8266 modules including ESP-03 also require GPIO15 to be tied to ground at all times for proper function.
Flashing
With the software environment setup and the ESP8266 in bootloader mode, its time to finish the flashing process.
You will need to find the path to the UART. In OS X these are typically in the /dev/ path and typically begin with “tty.”. List these paths with:
ls /dev/tty.*
For FTDI based chips it is typically “tty.usbserial-xxxxxxxx”, find the correct path for your UART and copy it to the clip board.
The final step is to program the chip. To do this, use the following command to flash. Be sure to replace “/dev/tty.usbserial-FTSMF90L” with the path to your UART and “nodemcu_integer_0.9.6-dev_20150406.bin” with the name of the firmware file that you wish to download.
Enter your password for Sudo and with some luck, you’ll see a message that looks something like this:
Flash For Mac Os X Yosemite Reader
There you have it, any questions on this process, the ESP8266 forum is a great resource. How to Flash NodeMCU on Mac OS X Yosemite