Attendees

• Mark

• @Trifun Savic

• @David Burnett

• @Thomas Watteyne

Minutes

• “Bootloader on nRF” Mark

  • alternative to optical bootloader

  • safer and easier to SCuM

  • application is complete

  • PC-to-NRF over UART, based on Teensy code

    • “prepare“ command

    • 64kB of data

    • “transmit“ command

    • typically

  • SCuM behavior: always load 64 kB

  • not tested on SCuM, but using LEDs

  • UART without

  • on the computer side, Python script

    • 4 stages

  • loading from nRF to SCuM

  • Mark describes the 3 wire pin

    • DATA pin: bit value at each

    • LATCH pin: high every 32th operation, toggles every 4B

    • CLK pin: toggle when SCuM should read bits. Max speed of CLK pin is 1MHz per @David Burnett

  • triggering of the bootloading

    • system boots up with no boot source

    • 3-wire bus is constantly listening for bits

    • when 3-wire bootload is done, inside SCuM, issues soft resets

    • 2 reset pins: soft reset (resets PC), hard pin (clears RAM and all)

  • next steps

    • code review with @Thomas Watteyne

    • CRC

    • document

    • push to GitHub

  • suggestions from @David Burnett

    • verify voltage levels

    • additional function for ADC

    • calibration routines for ADC

    • analog scan chain function

• discussion about voltage levels