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• Bootloader update

  Sophi Kravitz • 01/29/2021 at 17:10 • 0 comments

  Using J-link 

  GCC ARM toolchain

  -add pullup to 5V

  -tie SAMD51 vref to 3.3V for analog audio

• UF2 Bootloader Links

  Ted Yapo • 03/21/2020 at 03:00 • 0 comments

  The UF2 bootloader is neat in that it exposes a USB filesystem that you can simply drag-and-drop files into from your host OS. Here are some links to resources for building and burning:

  Building

  https://www.hackster.io/wallarug/uf2-bootloader-creating-custom-boards-c9620c

  Burning

  Using Atmel Studio (Windows Only)
  https://learn.adafruit.com/how-to-program-samd-bootloaders?view=allow-to-program-samd-bootloaders?view=all

  
  Using Command Line (Hopefully Linux, too)

  https://forums.adafruit.com/viewtopic.php?f=57&t=142170&p=707151#p707151
  

• Important Links

  Sophi Kravitz • 03/03/2020 at 23:14 • 0 comments

  Soundboard in 10 minutes

  BOM

  Github

  How to build Circuit Python. Hint: look at Trinket config file to configure external flash.

• Functionality/ spec list

  Sophi Kravitz • 02/28/2020 at 17:22 • 0 comments

  This is a SAMD51 Cortex M4 with space for a small bat sound (we're testing 512 kB and 1 mB). 

  • Sound / speaker
  • 2 LEDs
  • 4 wire connector for communications with D+, D-, V, GND
  • Circuit Python compatible
  • Capacitive touch sensor
  • Easter eggs

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