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Import of the watch repository from Pebble
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Matthieu Jeanson
Katharine Berry
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150
third_party/jerryscript/targets/esp8266/docs/ESP-PREREQUISITES.md
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third_party/jerryscript/targets/esp8266/docs/ESP-PREREQUISITES.md
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#### Preparation
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##### Accessories
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You need,
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* 3.3V power supply. You can use bread board power (+5V, +3.3V). I used LM317 like this;
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* Use [LM317](http://www.ti.com/lit/ds/symlink/lm317.pdf)
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* R1 = 330 Ohm, R2 = 545 Ohm (1K + 1.2K in parallel)
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* 5V 2A adaptor
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* USB to RS-232 Serial + RS-232 Serial to Digital or USB-to-RS232 TTL converter
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#### Toolchain
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Reference [Toolchain](https://github.com/esp8266/esp8266-wiki/wiki/Toolchain) page.
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I've slightly changed the step to use SDK from Espressif official SDK
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(https://github.com/espressif/esp_iot_rtos_sdk)
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##### Toolchain:
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dependencies for x86
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```
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sudo apt-get install git autoconf build-essential gperf \
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bison flex texinfo libtool libncurses5-dev wget \
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gawk libc6-dev-i386 python-serial libexpat-dev
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sudo mkdir /opt/Espressif
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sudo chown $USER /opt/Espressif/
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```
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dependencies for x64
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```
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sudo apt-get install git autoconf build-essential gperf \
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bison flex texinfo libtool libncurses5-dev wget \
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gawk libc6-dev-amd64 python-serial libexpat-dev
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sudo mkdir /opt/Espressif
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sudo chown $USER /opt/Espressif/
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```
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crosstool-NG
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```
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cd /opt/Espressif
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git clone -b lx106-g++-1.21.0 git://github.com/jcmvbkbc/crosstool-NG.git
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cd crosstool-NG
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./bootstrap && ./configure --prefix=`pwd` && make && make install
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./ct-ng xtensa-lx106-elf
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./ct-ng build
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```
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add path to environment file such as `.profile`
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```
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PATH=$PWD/builds/xtensa-lx106-elf/bin:$PATH
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```
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##### Espressif SDK: use Espressif official
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```
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cd /opt/Esprissif
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git clone https://github.com/espressif/ESP8266_RTOS_SDK.git ESP8266_RTOS_SDK.git
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ln -s ESP8266_RTOS_SDK.git ESP8266_SDK
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cd ESP8266_SDK
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git checkout -b jerry a2b413ad2996450fe2f173b6afab243f6e1249aa
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```
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We use SDK 1.2.0 version which has stdlib.h and others. Latest 1.3.0 version,
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as of writing this document, doesn't have it.
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(If anyone knows how to use latest version, please add an issue or send a PR.)
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set two environment variables such as in .profile
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```
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export SDK_PATH=/opt/Espressif/ESP8266_SDK
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export BIN_PATH=(to output folder path)
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```
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##### Xtensa libraries and headers:
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```
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cd /opt/Espressif/ESP8266_SDK
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wget -O lib/libhal.a https://github.com/esp8266/esp8266-wiki/raw/master/libs/libhal.a
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```
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##### ESP image tool
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```
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cd /opt/Espressif
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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
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sudo dpkg -i esptool_0.0.2-1_i386.deb
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```
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##### ESP upload tool
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```
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cd /opt/Espressif
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git clone https://github.com/themadinventor/esptool esptool-py
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sudo ln -s $PWD/esptool-py/esptool.py crosstool-NG/builds/xtensa-lx106-elf/bin/esptool.py
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```
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#### Test writing with Blinky example
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##### Get the source
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found one example that works with SDK V1.2 (which is based on FreeRTOS, as of writing)
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* https://github.com/mattcallow/esp8266-sdk/tree/master/rtos_apps/01blinky
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##### Compile
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Read `2A-ESP8266__IOT_SDK_User_Manual_EN` document in
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[this](http://bbs.espressif.com/viewtopic.php?f=51&t=1024) link.
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It's configured 2048KB flash
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```
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BOOT=new APP=1 SPI_SPEED=80 SPI_MODE=QIO SPI_SIZE_MAP=5 make
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BOOT=new APP=2 SPI_SPEED=80 SPI_MODE=QIO SPI_SIZE_MAP=5 make
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```
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or old way... this works not sure this is ok.
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```
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make BOOT=new APP=0 SPI_SPEED=80 SPI_MODE=QIO SPI_SIZE_MAP=2
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```
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##### Flashing
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* power off ESP8266 board
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* connect GPIO0 to GND, connect GPIO2 to VCC
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* power on
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* write
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```
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sudo /opt/Espressif/esptool-py/esptool.py \
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--port /dev/ttyUSB0 write_flash \
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0x00000 $SDK_PATH/bin/"boot_v1.4(b1).bin" \
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0x01000 $BIN_PATH/upgrade/user1.2048.new.5.bin \
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0x101000 $BIN_PATH/upgrade/user2.2048.new.5.bin \
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0x3FE000 $SDK_PATH/bin/blank.bin \
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0x3FC000 $SDK_PATH/bin/esp_init_data_default.bin
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```
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_change `/dev/ttyUSB1` to whatever you have._
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or the old way...this works not sure this is ok.
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```
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cd $BIN_PATH
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sudo /opt/Espressif/esptool-py/esptool.py \
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--port /dev/ttyUSB0 write_flash \
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0x00000 eagle.flash.bin 0x40000 eagle.irom0text.bin
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```
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* power off
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* disconnect GPIO0 so that it is floating
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* connect GPIO2 with serial of 470 Ohm + LED and to GND
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* power On
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LED should blink on and off every second
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