jerryscript/targets/baremetal-sdk/esp8266-rtos-sdk/docs/ESP-PREREQUISITES.md

Preparation

Accessories

You need,

• 3.3V power supply. You can use bread board power (+5V, +3.3V). I used LM317 like this;
  • Use LM317
  • R1 = 330 Ohm, R2 = 545 Ohm (1K + 1.2K in parallel)
  • 5V 2A adaptor
• USB to RS-232 Serial + RS-232 Serial to Digital or USB-to-RS232 TTL converter

Tools

The rest of this document will assume that you download all necessary tools into a common directory structure. For the sake of simplicity, $HOME/Espressif will be used as the root of this structure. Feel free to deviate from this but then adapt all the paths accordingly.

mkdir $HOME/Espressif

Toolchain

Download the toolchain pre-built for your development platform to $HOME/Espressif and untar it. E.g., on Linux/x86-64:

cd $HOME/Espressif
tar xvfz xtensa-lx106-elf-linux64-1.22.0-88-gde0bdc1-4.8.5.tar.gz

Espressif SDK: use Espressif official

cd $HOME/Esprissif
git clone https://github.com/espressif/ESP8266_RTOS_SDK.git -b v2.1.0

This version is tested and works properly.

ESP image tool

cd $HOME/Espressif
wget -O esptool_0.0.2-1_i386.deb https://github.com/esp8266/esp8266-wiki/raw/master/deb/esptool_0.0.2-1_i386.deb
sudo dpkg -i esptool_0.0.2-1_i386.deb

ESP upload tool

cd $HOME/Espressif
git clone https://github.com/themadinventor/esptool

Set environment variables

Set environment variables, might also go in your .profile:

export PATH=$HOME/Espressif/xtensa-lx106-elf/bin:$PATH
export SDK_PATH=$HOME/Espressif/ESP8266_RTOS_SDK
export ESPTOOL_PATH=$HOME/Espressif/esptool
export BIN_PATH=(to output folder path)

Test writing with Blinky example

Get the source

found one example that works with SDK V1.2 (which is based on FreeRTOS, as of writing)

• https://github.com/mattcallow/esp8266-sdk/tree/master/rtos_apps/01blinky

Compile

Read 2A-ESP8266__IOT_SDK_User_Manual_EN document in this link.

It's configured 2048KB flash

BOOT=new APP=1 SPI_SPEED=80 SPI_MODE=QIO SPI_SIZE_MAP=5 make
BOOT=new APP=2 SPI_SPEED=80 SPI_MODE=QIO SPI_SIZE_MAP=5 make

or old way... this works not sure this is ok.

make BOOT=new APP=0 SPI_SPEED=80 SPI_MODE=QIO SPI_SIZE_MAP=2

Flashing

• power off ESP8266 board
• connect GPIO0 to GND, connect GPIO2 to VCC
• power on
• write

sudo $HOME/Espressif/esptool/esptool.py \
  --port /dev/ttyUSB0 write_flash \
  0x00000 $SDK_PATH/bin/"boot_v1.7.bin" \
  0x01000 $BIN_PATH/upgrade/user1.2048.new.5.bin \
  0x101000 $BIN_PATH/upgrade/user2.2048.new.5.bin \
  0x3FE000 $SDK_PATH/bin/blank.bin \
  0x3FC000 $SDK_PATH/bin/esp_init_data_default.bin

change /dev/ttyUSB1 to whatever you have.

or the old way...this works not sure this is ok.

cd $BIN_PATH
sudo $HOME/Espressif/esptool/esptool.py \
--port /dev/ttyUSB0 write_flash \
0x00000 eagle.flash.bin 0x40000 eagle.irom0text.bin

• power off
• disconnect GPIO0 so that it is floating
• connect GPIO2 with serial of 470 Ohm + LED and to GND
• power On