135 lines
4.5 KiB
Markdown
135 lines
4.5 KiB
Markdown
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 <https://github.com/pfalcon/esp-open-sdk>. 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.
|
||
|
||
__512KB FlashROM version__
|
||
|
||
The normal build described above requires modules with at least 1MB of FlashROM
|
||
onboard. There's a special configuration for 512KB modules, which can be
|
||
built with `make 512k`. This configuration is highly limited, lacks filesystem
|
||
support, WebREPL, and has many other features disabled. It's mostly suitable
|
||
for advanced users who are interested to fine-tune options to achieve a required
|
||
setup. If you are an end user, please consider using a module with at least 1MB
|
||
of FlashROM.
|
||
|
||
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 in beta, 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.
|