micropython-samples

A place for assorted code ideas for MicroPython. Most are targeted at the Pyboard variants.

fastbuild - Pull and build Pyboard firmware under Linux

These scripts are intended to speed and simplify rebuilding firmware from source notably where pyboards of different types are in use, or when frozen bytecode necessitates repeated compilation and deployment. In particular buildpyb will detect the attached Pyboard type, build the appropriate firmware, put the board into DFU mode and deploy it, before launching rshell. The latter step may be removed if rshell is not in use.

Includes udev rules to avoid jumps from /dev/ttyACM0 to /dev/ttyACM1 by ensuring Pyboards of all types appear as /dev/pyboard. Rules are also offered for USB connected WiPy (V1.0) and FTDI USB/serial adaptors.

These scripts use Python scripts pyb_boot to put the Pyboard into DFU mode and pyb_check to determine the type of attached board. These use the pyboard.py module in the source tree to execute scripts on the attached board.

Edits

buildnew and buildpyb will need editing to point to your micropython directory.

In the buildpyb script you may wish to edit the -j 8 argument to make. This radically speeds build on a multi core PC. Empirically 8 gave the fastest build on my core i7 4/8 core laptop: adjust to suit your PC. You may also want to alter the call to rshell.

The script assumes a frozen modules directory stmhal/modules. You may wish to change this. A recent update enabled the directory for frozen to be located anywhere in the filesystem.

In buildpyb you may wish to delete the unix make commands.

Dependencies

Python3.x
pyserial apt-get install python3-serial.
Verify that pyboard.py in the tools directory of the source tree works (tests in comments at the start of the code).
Copy 49-micropython.rules to (on most distros) /etc/udev/rules.d.

Build script: buildpyb

This checks the attached pyboard. If it's a V1.0, V1.1 or Lite it builds the correct firmware and deploys it. Otherwise it produces an error message.

Optional argument --clean - if supplied does a make clean to delete all files produced by the previous build before proceeding.

Update source: buildnew

Report state of master branch, update sources and issue make clean for cross compiler, Pyboard variants, and ESP8266. Builds cross compiler and unix port.

ESP8266 Build

buildesp A script to build and deploy ESP8266 firmware. Accepts optional --clean argument.

ssd1306

A means of rendering multiple larger fonts to the SSD1306 OLED display

mutex

A class providing mutal exclusion enabling interrupt handlers and the main program to access shared data in a manner which ensures data integrity.

watchdog

Access the simpler of the Pyboard's watchdog timers.

reverse

Fast reverse a bytearray.

font

Convert a C file produced by GLCD Font Creator to Python for storage as persistent byte code.

ds3231_pb

Driver for the DS3231 low cost precison RTC, including a facility to calibrate the Pyboard's RTC from the DS3231.

Buildcheck

Raise an exception if a firmware build is earlier than a given date.

timed_function

Time a function's execution using a decorator

ESP8266

benchmark.py Tests the performance of MQTT by periodically publishing while subscribed to the same topic. Measures the round-trip delay. Adapt to suit your server address and desired QOS (quality of service, 0 and 1 are supported). After 100 messages reports maximum and minimum delays.

conn.py Connect in station mode using saved connection details where possible

Rotary Incremental Encoder

Classes for handling incremental rotary position encoders. Note that the Pyboard timers can do this in hardware. These samples cater for cases where that solution can't be used. The encoder_timed.py sample provides rate information by timing successive edges. In practice this is likely to need filtering to reduce jitter caused by imperfections in the encoder geometry.

There are other algorithms but this is the simplest and fastest I've encountered.

These were written for encoders producing TTL outputs. For switches, adapt the pull definition to provide a pull up or pull down as required.

License

Any code placed here is released under the MIT License (MIT).
The MIT License (MIT)
Copyright (c) 2016 Peter Hinch
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.