links

• http://www.esp8266.com/
• https://github.com/esp8266/esp8266-wiki/wiki
• http://www.electrodragon.com/w/Wi07c
• https://nurdspace.nl/ESP8266

• Documentation, tools, firmwares https://onedrive.live.com/?cid=C4DDF72E6EEA3826&id=C4DDF72E6EEA3826%21631

• https://github.com/esp8266/arduino
• https://github.com/igrr/esptool-ck (with reset support)

ESP-01 pinout

• all IO is 3.3V (3.6V max)
• CH_PD i chip-enable and has to be connected to VCC (3.3V)
• RST, GPIO0, GPIO2 should be pulled up to VCC for normal operation (GPIO0 at minumum!)
• GPIO0 pull to ground for firmware update
• make sure that 3.3V VCC power supply can support 300-400mA or there WILL be problems!

serial port

baud rate 115200

AT+GMR
00160901

OK

AT+RST

OK

 ets Jan  8 2013,rst cause:4, boot mode:(3,7)

wdt reset
load 0x40100000, len 24444, room 16 
tail 12
chksum 0xe0
ho 0 tail 12 room 4
load 0x3ffe8000, len 3168, room 12 
tail 4
chksum 0x93
load 0x3ffe8c60, len 4956, room 4 
tail 8
chksum 0xbd
csum 0xbd

ready

ESP-201

http://www.banggood.com/ESP8266-ESP-201-Remote-Serial-Port-WIFI-Transceiver-Wireless-Module-p-964288.html

from http://smarpl.com/content/esp8266-esp-201-module-first-impressions

• http://jas-hacks.blogspot.com/2015/04/iot-esp8266-esp-201-cc1110-xrf.html

One quirk with the ESP-201 is that is IO15 has to be grounded for the device to function. To flash the device IO00 has to be grounded.

AT+RST

OK

 ets Jan  8 2013,rst cause:4, boot mode:(3,7)

wdt reset
load 0x40100000, len 212, room 16 
tail 4
chksum 0x5e
load 0x3ffe8000, len 788, room 4 
tail 0
chksum 0x1c
load 0x3ffe8314, len 72, room 8 
tail 0
chksum 0x55
csum 0x55
jump to user1

nodemcu

• https://github.com/nodemcu/nodemcu-firmware
• https://github.com/nodemcu/nodemcu-firmware/wiki/nodemcu_api_en

esptool.py

dpavlin@x200:/rest/cvs/esptool$ git remote -v
origin  https://github.com/themadinventor/esptool (fetch)
origin  https://github.com/themadinventor/esptool (push)

dpavlin@x200:/rest/cvs/esptool$ ./esptool.py --port /dev/ttyUSB2 read_mac
Connecting...
MAC: 18:fe:34:a0:38:72

flash firmware

dpavlin@blue:/opt/Espressif/esptool$ ./esptool.py read_mac
Connecting...
MAC: 18:fe:34:a0:38:72
dpavlin@blue:/opt/Espressif/esptool$ ./esptool.py --port /dev/ttyUSB0 write_flash 0x00000 ../nodemcu-firmware/pre_build/latest/nodemcu_latest.bin 
Connecting...
Erasing flash...
Writing at 0x00010800... (17 %) 

Get latest build from https://github.com/nodemcu/nodemcu-firmware/releases

dpavlin@x200:/rest/cvs/esptool$ ./esptool.py --port /dev/ttyUSB2 write_flash 0x00000 ./nodemcu_float_0.9.6-dev_20150406.bin

dpavlin@x200:/rest/cvs/esptool$ microcom -p /dev/ttyUSB2 -s 9600
connected to /dev/ttyUSB2
Escape character: Ctrl-\
Type the escape character followed by c to get to the menu or q to quit

> node.restart()

NodeMCU 0.9.6 build 20150406  powered by Lua 5.1.4
lua: cannot open init.lua
> 

build from source

For latest features, you might want to rebuild software from github source

dpavlin@x200:/rest/cvs$ git clone https://github.com/pfalcon/esp-open-sdk.git

dpavlin@x200:/rest/cvs/esp-open-sdk$ export PATH=/rest/cvs/esp-open-sdk/xtensa-lx106-elf/bin:$PATH




git clone https://github.com/nodemcu/nodemcu-firmware.git
cd nodemcu-firmware

dpavlin@x200:/rest/cvs/nodemcu-firmware$ git checkout -b dev origin/dev
Branch dev set up to track remote branch dev from origin.
Switched to a new branch 'dev'


make

# check that device is in boot loader mode

dpavlin@x200:/rest/cvs/nodemcu-firmware$ ../esptool/esptool.py --port /dev/ttyUSB1 read_mac
Connecting...
MAC: 18:fe:34:99:f2:83

# flash new firmware

dpavlin@x200:/rest/cvs/nodemcu-firmware$ make flash ESPPORT=/dev/ttyUSB1
make -C ./app flash
make[1]: Entering directory '/rest/cvs/nodemcu-firmware/app'
../tools/esptool.py --port /dev/ttyUSB1 write_flash 0x00000 ../bin/0x00000.bin 0x10000 ../bin/0x10000.bin
Connecting...
Erasing flash...
Writing at 0x0000c500... (100 %)
Erasing flash...
Writing at 0x00068c00... (100 %)

Leaving...
make[1]: Leaving directory '/rest/cvs/nodemcu-firmware/app'

A library for the Microchip MCP3021 A/D converter for use with the ESP8266.

https://github.com/AllAboutEE/ESP8266-MCP3021-Library

nodemcu-uploader

dpavlin@x200:/rest/cvs$ git clone https://github.com/kmpm/nodemcu-uploader
dpavlin@x200:/rest/cvs/nodemcu-uploader$ ./nodemcu-uploader.py --port /dev/ttyUSB2 --baud 9600 file list
Listing files
for key,value in pairs(file.list()) do print(key,value) end
> 

ESP8266 as wireless JTAG Programmer

https://github.com/emard/wifi_jtag