MicroPython port to ESP8266 =========================== This is an experimental port of MicroPython for the WiFi modules based on Espressif ESP8266 chip. WARNING: The port is experimental and many APIs are subject to change. Supported features include: - REPL (Python prompt) over UART0. - Garbage collector, exceptions. - Unicode support. - Builtin modules: gc, array, collections, io, struct, sys, esp, network, many more. - Arbitrary-precision long integers and 30-bit precision floats. - WiFi support. - Sockets using modlwip. - GPIO and bit-banging I2C, SPI support. - 1-Wire and WS2812 (aka Neopixel) protocols support. - Internal filesystem using the flash. - WebREPL over WiFi from a browser (clients at https://github.com/micropython/webrepl). - Modules for HTTP, MQTT, many other formats and protocols via https://github.com/micropython/micropython-lib . Work-in-progress documentation is available at http://docs.micropython.org/en/latest/esp8266/ . Build instructions ------------------ The tool chain required for the build is the OpenSource ESP SDK, which can be found at . Clone this repository and run `make` in its directory to build and install the SDK locally. Make sure to add toolchain bin directory to your PATH. Read esp-open-sdk's README for additional important information on toolchain setup. Add the external dependencies to the MicroPython repository checkout: ```bash $ git submodule update --init ``` See the README in the repository root for more information about external dependencies. The MicroPython cross-compiler must be built to pre-compile some of the built-in scripts to bytecode. This can be done using: ```bash $ make -C mpy-cross ``` Then, to build MicroPython for the ESP8266, just run: ```bash $ cd esp8266 $ make axtls $ make ``` This will produce binary images in the `build/` subdirectory. If you install MicroPython to your module for the first time, or after installing any other firmware, you should erase flash completely: ``` esptool.py --port /dev/ttyXXX erase_flash ``` Erase flash also as a troubleshooting measure, if a module doesn't behave as expected. To flash MicroPython image to your ESP8266, use: ```bash $ make deploy ``` This will use the `esptool.py` script to download the images. You must have your ESP module in the bootloader mode, and connected to a serial port on your PC. The default serial port is `/dev/ttyACM0`, flash mode is `qio` and flash size is `detect` (auto-detect based on Flash ID). To specify other values, use, eg (note that flash size is in megabits): ```bash $ make PORT=/dev/ttyUSB0 FLASH_MODE=qio FLASH_SIZE=32m deploy ``` The image produced is `build/firmware-combined.bin`, to be flashed at 0x00000. First start ----------- __Serial prompt__ You can access the REPL (Python prompt) over UART (the same as used for programming). - Baudrate: 115200 __WiFi__ Initally, the device configures itself as a WiFi access point (AP). - ESSID: MicroPython-xxxxxx (x’s are replaced with part of the MAC address). - Password: micropythoN (note the upper-case N). - IP address of the board: 192.168.4.1. - DHCP-server is activated. __WebREPL__ Python prompt over WiFi, connecting through a browser. - Hosted at http://micropython.org/webrepl. - GitHub repository https://github.com/micropython/webrepl. Please follow the instructions there. More detailed instructions can be found at http://docs.micropython.org/en/latest/esp8266/esp8266/tutorial/intro.html Troubleshooting --------------- While the port is still in alpha, it's known to be generally stable. If you experience strange bootloops, crashes, lockups, here's a list to check against: - You didn't erase flash before programming MicroPython firmware. - Firmware can be occasionally flashed incorrectly. Just retry. Recent esptool.py versions have --verify option. - Power supply you use doesn't provide enough power for ESP8266 or isn't stable enough. - A module/flash may be defective (not unheard of for cheap modules). Please consult dedicated ESP8266 forums/resources for hardware-related problems.