From Eric

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	The pin-out is the following.		The pin-out is the following.
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Revision as of 15:20, 17 April 2016

Contents 1 The chip 2 The board 3 Connecting the ESP8266 board to a PC 4 Using AT commands 5 Reprogramming the ESP8266 5.1 Using the Arduino environment 5.2 Installing a cross-compilation environment 5.3 Building and installing the cross-compiler and sdk 5.4 Uploading the software to the chip

The chip

The ESP8266 is a SoC designed by Espressif.

Someone managed to decap the chip (well, a similar one) and show its internal layout (source here):

The MCU is a lx106 processor IP.

The board

I use the following board.

The pin-out is the following.

Connecting the ESP8266 board to a PC

Using AT commands

Every command must end with a CR/LF sequence. On minicom, this can be obtained using CTRL-M followed by CTRL-J. The AT commands are fully described in Espressif manual "[|ESP8266 AT Instruction Set]".

Here is a trace of the commands I used to

Reprogramming the ESP8266

The ESP8266 can be reprogrammed. To do so, you can either go the easy way using Arduino or the hard way installing a cross-compiler, a download, etc.

Using the Arduino environment

(To be completed.)

Installing a cross-compilation environment

I have followed the indications given here. A lot of information is also provided by Espressif on their [1]). In particular, a lot of documents are available on page.

On a fresh MINT installation, here are the commands I had to type to get a complete development environment:

 git clone --recursive https://github.com/pfalcon/esp-open-sdk.git
 cd esp-open-sdk/
 sudo apt-get install autoconf
 sudo apt-get install gperf
 sudo apt-get install texinfo
 sudo apt-get install libtool
 sudo apt-get install automake
 sudo apt-get install ncurses-dev
 sudo apt-get install g++
 sudo apt-get install expat
 make STANDALONE=y

A lot of very interesting/important information about programming the ESP8266 are given here.

Building and installing the cross-compiler and sdk

Uploading the software to the chip

The chip can be placed in the flash programming mode by pulling up GPIO0 during power-on.

A flash download tool is provided by Espressif here. ANother tool (using Python) is available here.