2020-04-26.md

Office Hours

• Date: 2020-04-26
• Time: 18:30ish
• Link to this stream
• Link to Office Hours Channel

Notice

This is the first Office Hours stream, but because I have to wait 24 hours before my first Live Stream on a new channel, this stream will be on my old channel. I plan to re-upload this stream to my new channel, once I can.

Please subscribe to my new channel so I can reserve a sweet URL!

Post Show Summary:

1. Merged a bunch of book/discovery/embedonomicon PRs
   • Ran into an issue due to codegen change for embedonomicon testing
   • My computer dropped some frames :(
2. Read up on the background info for ESB
   • Read the nordic docs
   • Read the nordic code
   • Read @thalesfragoso's code (see below)
3. Didn't get to the RFC yet!

Planned Topics

• Hello, (new channel) world!
• Triaging Rust Embedded Docs Issues/PRs
  • Discovery Book
  • The Embedded Book
  • Embedonomcon
• Playing with Nordic Radios and Enhanced ShockBurst
  • @thalesfragoso's repo
  • Nordic SDK docs
  • nRF52832 DataSheet v1.4
  • nRF52832 SDK download
• Write an RFC for Embedded WG MSRV
  • Tracking Issue
  • JP's Hot Take

Stream Notes

Radio stuff!

• Nordic Chips
  • Support propietary protocol: Enhanced ShockBurst
  • SOME chips (like the 840) can do 802.15.4
    • Zigbee/Thread
• ESB
  • Hub and Spoke/Star topology
  • Central device:
    • Usually listens
    • Can include data on an ACK
  • Edge device(s):
    • Sends when it feels like it
    • Can listen for ACKs
  • Addresses and Pipes?
    • No idea yet
  • Turnaround for ACKs:
    • SUPER SHORT
    • Highest prio interrupts
    • Must preload messages

Useful docs:

• https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/intro-to-shockburstenhanced-shockburst

Notes for next time:

• Review how PPI works in nRF52 Datasheet
• Review how the radio registers look (optional)
• Check in with Thales to see how code is going
• Start writing some example Rust code
• Before the stream:
  • Make sure I have two radios handy for testing
  • Set up a template rtfm/dwm1001 project for playgrounding
  • Have UART/logging handy already for testing
• On Monday:
  • Start writing some code!
  • Goal:
    • Getting LED remote control working
      • One device reading the button, being the PTX role
      • One device setting the LED, being the PRX role
    • Stretch goal:
      • Get a loopback going (offset by one packet)
      • Interval