Synopsis

Work on the badge from MCH2022

See Also:

• https://wiki.mch2022.org/Badge
• https://www.badge.team/docs/badges/mch2022/software-development/

How to Develop and Push Python Code

See: https://www.badge.team/docs/badges/mch2022/software-development/

1. Create this file: /etc/udev/rules.d/99-mch2022.rules as sudo:

   (find-file "/sudo:root@localhost:/etc/udev/rules.d/99-mch2022.rules")
       

2. Add these lines:

   SUBSYSTEM==”usb”, ATTR{idVendor}==”16d0”, ATTR{idProduct}==”0f9a”, MODE=”0666”

3. Run

   sudo udevadm control --reload-rules
   sudo udevadm trigger
       

4. Plug in via usb-C and start the python app. Then

   screen /dev/ttyACM0 115200
       

   which gives you a python prompt.

   Note: To suspend the sesssion: C-a d, to resume: screen -r <TAB>. To kill it from the outside: screen -X -S <TAB> quit.

5. Enter

   import display
   display.drawFill(0xd62728)  # This is matplotlib's C3 (red)
   display.flush()
       

   see the online API reference. For mch2022 specifics, see:

   import mch22
   dir(mch22)
   ['__class__', 'buttons', 'exit_python', 'fpga_disable', 'fpga_load',
    'fpga_receive', 'fpga_send', 'fpga_send_turbo', 'fpga_transaction',
    'get_brightness', 'lcd_mode', 'read_vbat', 'read_vusb',
    'set_brightness', 'set_handler']
       

Upload My Own App

1. Get the copy scripts from github:

   sudo -H pip3 install pyusb
   git -C mch2022 clone git@github.com:badgeteam/mch2022-tools.git
       

2. See what is on the batch

   cd mch2022-tools
   python3 webusb_fat_ls.py /flash/
       

   Booting into WebUSB, please wait …

   ████████████████████

   100.0%

   transfer speed: 1.28 kb/s Directory listing for ”flash“… Directory “apps” Directory “lib” Directory “cache” Directory “config”

Hatchery

https://mch2022.badge.team/

Using the Display

https://www.badge.team/docs/esp32-platform-firmware/esp32-app-development/api-reference/display

Example App - Neopixels

• See here: https://www.badge.team/docs/badges/mch2022/software-development/micropython/neopixels/
• Code is here: mch2022/neopixels.py
• Copy it following the above steps:

  python3 webusb_fat_mkdir.py /flash/apps/python/matplotlib_colors
      

  Starting… /internal/apps/python/matplotlib_colors Succesfully created directory

  python3 webusb_fat_push.py ../neopixels.py /flash/apps/python/matplotlib_colors/__init__.py
      

  Booting into WebUSB, please wait …

  ████████████████████

  100.0%

  transfer speed: 33.90 kb/s File uploaded

• Some helpful API details
  • display
  • buttons