Swagbadge Reinstall

Overview

1. Install the OS utilities you'll need
2. Locate the USB port your badge is on
3. Make a backup of your encryption key (and any other settings you want to keep such as your wifi config)
4. Flash the microprocessor with the firmware
5. Send through a copy of the new code

Windows 10: connecting to the badge

How to find your serial COM port on Windows:

• Use the Device Manager.
• Under the "Ports" category, you'll see one or more entries. Hopefully one of which is your badge! It will tell you what Port it is on.
• If you can't see your badge, you might need to go up to the View menu and use "Show hidden devices" and see if that helps.

Windows 10 may automatically discover your #swagbadge USB hardware and automatically install the correct USB serial hardware driver, or if nothing still shows up, you might need to update your USB drivers for supporting the USB hardware CP210x on your #swagbadge, please follow these instructions:

• Download the CP210x drivers from Silicon Labs Windows Universal Driver
• Unpack the zip file
• Follow the Silicon Labs instructions for INF only install (Section 5 on page 9)

By this point, you have know the serial COM port that your #swagbadge is connected to, e.g COM4

Mac OS: connecting to the badge

How to find your serial COM port on OS X:

   $ ls /dev/tty.usb*

Unless you have lot of dev boards (or maybe a phone) plugged in you should just see a single filename there. Use this (without the /dev/ prefix) when using the open command in mpfshell

To get a working `mpfshell` install a recent version of Python (Python3.8 is known to work) using a installed DMG. Then create a *venv* and install the necessary tools using pip. For example:

   $ mkdir swag
   $ cd swag
   $ python3.8 -m venv env
   $ ./env/bin/pip install esptool mpfshell

You can then run scripts/mpf.sh to connect (do not include the leading /dev/ when setting AMPY_PORT):

   $ export AMPY_PORT=<your device node> # for bash, adjust to suit for your shell of choice
   $ scripts/mpf.sh
   mpfs [/]> 

Mac users beware: If you Ctrl-C mpfshell, (or disconnect USB cable while the badge connected to mpfshell), you could crash your desktop, due to the poor kernel drivers the Lolin32 Lite uses.

Linux: connecting to the badge

1. install the virtualwrapper https://virtualenvwrapper.readthedocs.io/en/latest/install.html
2. Add the below code to your .bashrc

  export WORKON_HOME=$HOME/.virtualenvs
  export VIRTUALENVWRAPPER_PYTHON=/usr/bin/python3
  export VIRTUALENVWRAPPER_VIRTUALENV=/usr/bin/virtualenv
  export PROJECT_HOME=$HOME/Programming
  source /usr/local/bin/virtualenvwrapper.sh
  export AMPY_PORT=ttyUSB0   # note: no leading /dev/

1. Create a firmware folder
2. Download the bin file as listed below...
3. Run ./scripts/flash_micropython.sh

Windows 10: installing utilities

• Install Miniconda3 to create a specific Python development environment. (Note we are using Python3 not Python2)
• Create specific Python 3 environment for playing around with your #swagbadge
  • Start an Anaconda Powershell Prompt (aka Windows Terminal)
  • conda create --yes -n swagbadge python=3
  • conda activate swagbadge
• Your command prompt should now look like: (swagbadge) C:\Users\[Username]>

• Install some python tools to let us prepare and communicate with the badge
  • pip install esptool mpfshell

• To test that the required tools are installed, trying running the following commands
  • esptool # Should show you help on running the esptool
  • mpfshell # Should show three lines of output
    • exit # To exit mpfshell

Download #swagbadge (Aiko Engine) firmware

Within your Anaconda Prompt session, change directory to where you’d like the #swagbadge software to be downloaded, for example:

• cd $HOME/software

Download #swagbadge firmware:

• git clone https://github.com/geekscape/aiko_engine_mp.git # NOTE: this URL will change once we're live
• cd aiko_engine_mp

Install MicroPython

• Create a directory to hold the MicroPython firmware, such as aiko_engine_mp/firmware/
• mkdir firmware

Fetch the firmware

• Using your web browser, download: esp32-idf4-20200902-v1.13.bin (mouse right button click → [Save As …] saving the MicroPython firmware in the firmware directory you just made.
  • The MicroPython download list has a link to a bunch of firmware drivers, we are using the one for the esp32 device, with the latest 1.4 generic

STOP! Make a copy of your badge's encryption key and network settings before proceeding. Use mpfshell to get configuration/net.py and configuration/keys.db

Erase and reinstall firmware

Erase #swagbadge LoLin-Lite ESP32 flash memory

• esptool --chip esp32 --port COM3 erase_flash # adjust the port to suit.
• You’ll know it’s worked, if the output finishes with “Hard resetting via RTS pin…”

You may get this error, if so, try esptool.py instead:

sauron [mc]$ esptool --chip esp32 --port /dev/ttyUSB0 erase_flash
esptool.py v2.8
Serial port /dev/ttyUSB0
Connecting....
Chip is ESP32D0WDQ6 (revision 1)
Features: WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme None
Crystal is 40MHz
MAC: 7c:9e:bd:ed:79:24
Enabling default SPI flash mode...
Erasing flash (this may take a while)...

A fatal error occurred: ESP32 ROM does not support function erase_flash.
sauron [mc]$ esptool.py --chip esp32 --port /dev/ttyUSB0 erase_flash
esptool.py v2.6
Serial port /dev/ttyUSB0
Connecting....
Chip is ESP32D0WDQ6 (revision 1)
Features: WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme None
MAC: 7c:9e:bd:ed:79:24
Uploading stub...
Running stub...
Stub running...
Erasing flash (this may take a while)...
Chip erase completed successfully in 11.8s
Hard resetting via RTS pin...

Install microPython on the badge

• esptool --chip esp32 --port COM3 --baud 460800 write_flash -z 0x1000 firmware\esp32-idf4-20200902-v1.13.bin #adjust port and firmware location if necessary
• You’ll know it’s worked, if the output finishes with “Hard resetting via RTS pin…”

Test that the software is installed correctly by using mpfshell

• mpfshell -o COM3 # Adjust port to suit
• If it has made a connection to your badge, you will see it say

Connected to esp32
** Micropython File Shell v0.9.1, sw@kaltpost.de **
-- Running on Python 3.8 using PySerial 3.4 --
mpfs [/]> 

Using mpfshell

mpfshell has two functions: it lets you put files on/off the device, and it can give you a python shell to execute code on the device.

• Getting files on/off the device is a bit like commandline ftp
  • ls - looks at the files on your micropython device
  • lls - looks at the files on your local computer in the current directory
  • put - puts a file to the device
  • cat - shows you the contents of the file
  • help() - gives you more information on the commands
  • repl - opens up the python shell on the badge

Note: To get out of repl, use Ctrl-Q (on Windows) which drops you back into mpfshell

A little program to say hello world!

• >>> print("hello world")
• Output: hello world

A little program to turn the blue light on the board on and off (this is on the underside of the Swagbadge, visible through a circular cutout)

>>> import machine
>>> pin22=machine.Pin(22, machine.Pin.OUT, machine.Pin.PULL_UP)
>>> pin22.value(0) 
>>> pin22.value(1)

Alternatives to mpfshell: Thonny, rshell and pyboard.py

Thonny is an IDE for python, with micropython support. It comes with instructions for using Thonny with micropython.

rshell is an option, but it may not be reliable in all cases. However 'pip install rshell' also installs pyboard.

pyboard.py is the official tool that ships with micropython and is more flexible and reliable: http://docs.micropython.org/en/latest/reference/pyboard.py.html

sauron [mc]$ pyboard.py --device /dev/ttyUSB0 -c 'import os; print(os.statvfs("/")[0]*os.statvfs("/")[3], "bytes free out of",os.statvfs("/")[1]*os.statvfs("/")[2])'
1699840 bytes free out of 2097152

Saving your private key

Use mpfshell to get the file: `configuration/keys.db`.

Putting the Aiko framework onto the device, using mpfshell

• mpfshell COM5 -s scripts\aiko.mpf #run from within the aiko_framework_mp directory

Windows only: Patch mpfshell

Note! mpfshell used to need a patch applied to let it run a script under Windows. This is no longer required, but recorded here for archival purposes.

• Inside C:/users/USERNAME/Miniconda2/envs/swagbadge/Lib/site-packages/mp
• edit mpfshell.py
• Search for elif args.script is not None:, around line 796
• between that line and the next, insert two lines. It should look like:

    elif args.script is not None:

        if platform.system() == "Windows":  #INSERT THIS LINE
            mpfs.use_rawinput = True        #INSERT THIS LINE

        f = open(args.script, "r")

• Python is very particular about spacing. The rest of the code uses 4 spaces for indents so follow suit.