Teensy 3.1 bare metal: Writing a USB driver (2014) • Hacker News Board

Re: Teensy 3.1 bare metal: Writing a USB driver (2014)

#11

Post by hak8or » Tue, Dec 04, 2018, 4:31 AM UTC

danellis wrote: post #6

mattnewton wrote: post #5

Slightly off topic: I highly recommend this micro controller for projects big and small. It packs quite a punch in terms of ram/cpu per dollar, lots of pins, great community and Paul was really cool online and at maker’s faire. Thank you Paul, Robin, and the rest of the community for a great product! Off-off topic, as a web developer I love their super functional site. It even has an about page with pictures of Paul…

It doesn't seem terribly good value for money. You can get a Nucleo-32 or Nucleo-64 for $10-15. For $23 you can get a Nucleo-144.

You don't pay for just the IC and PCB, you are also paying for the in my opinion, fantastic API and documentation that comes with the teensy. Plus, access to a platform that is fairly popular and its users seem to be more, well, advanced, than most arduino folks. Because of this, the forums tend to skew towards less noise and more technical matters.

They are expensive, yes, but I am comfortable buying a board from them every few years to use as my main chip.

Re: Teensy 3.1 bare metal: Writing a USB driver (2014)

#12

Post by nayuki » Tue, Dec 04, 2018, 4:32 AM UTC

The article links to a web site that has excellent information on the low-level electrical and bit details of the USB protocol: http://www.usbmadesimple.co.uk/

Re: Teensy 3.1 bare metal: Writing a USB driver (2014)

#13

Post by cronix » Tue, Dec 04, 2018, 4:41 AM UTC

mattnewton wrote: post #10

danellis wrote: post #6

Earlier quoted context omitted.

It doesn't seem terribly good value for money. You can get a Nucleo-32 or Nucleo-64 for $10-15. For $23 you can get a Nucleo-144.

I guess I am comparing them more to arduino / adafruit replacements, rather than more direct manufacturer prices. I have no experience with Nucleo boards but many other boards I tried out just hadn’t no community or body of libraries to draw from, whereas the teensy is pretty popular in the makers community. In my case I happened to need to drive 1,000’s of LEDs in real-time for an art piece and not only is there goo…

I hear you. Check out the EPS32 [1][2]. It's faster, has more mem and has built in wifi, so you can access a webpage[3] on it via an ip and your browser and remote control it via your phone. FastLed runs on it, and there are level shifters similar to the Octo for it [4]. You can actually run 16 channels I believe (vs 8 on the Octo). It uses the same level shifter (x2) as the Octo. There is also an 8 channel available if you check the other products on Jason's store on that Tindie site[4]. It's arduino compat- so you probably wouldn't have to rewrite much at all.

[1] https://wiki.wemos.cc/products:d32:d32

[2] https://www.adafruit.com/product/3405

[3] https://github.com/jasoncoon/esp32-fastled-webserver

[4] https://www.tindie.com/products/jasoncoon/16-output-wemos-d3...

Re: Teensy 3.1 bare metal: Writing a USB driver (2014)

#14

Post by Marazan » Tue, Dec 04, 2018, 8:35 AM UTC

danellis wrote: post #6

mattnewton wrote: post #5

Slightly off topic: I highly recommend this micro controller for projects big and small. It packs quite a punch in terms of ram/cpu per dollar, lots of pins, great community and Paul was really cool online and at maker’s faire. Thank you Paul, Robin, and the rest of the community for a great product! Off-off topic, as a web developer I love their super functional site. It even has an about page with pictures of Paul…

It doesn't seem terribly good value for money. You can get a Nucleo-32 or Nucleo-64 for $10-15. For $23 you can get a Nucleo-144.

Do you get Paul's incredible support and dedication?

Re: Teensy 3.1 bare metal: Writing a USB driver (2014)

#15

Post by jamesmunns » Tue, Dec 04, 2018, 9:54 PM UTC

estebank wrote: post #9

For anyone that might be interested, there were some efforts some time back to get Rust running on the Teensy[1][2][3][4], and although there have been no recent updates, the code is available to use and should still be relevant although there have been changes[5][6][7] in the meantime. [1]: https://github.com/jamesmunns/teensy3-rs [2]: https://branan.github.io/teensy/ [3]: https://disconnected.systems/blog/bare-meta…

Hey,

Author of the first link above. The Teensy3 crate was some of my first embedded work, I was working with SimonSapin (author of the 4th link) at RustFest to get something working. That library wraps some of the Teensyduino code using bindgen, which gives you the ability to write application code using Rust.

Overall, the Teensy 3.1/3.2 family wasn't great for developing Rust, as they don't have debugger (SWD, similar to JTAG) lines available, meaning you have to use the serial bootloader, and rely on a serial port for all debugging. I believe the newer version of the board expose SWD lines now, so it's not a problem.

Let me know if you have any questions :)

Definitely check out the embedded WG[1], and the new Rust homepage[2]

[1]: https://github.com/rust-embedded/wg [2]: http://beta.rust-lang.org/what/embedded

Re: Teensy 3.1 bare metal: Writing a USB driver (2014)

#16

Post by danellis » Wed, Dec 12, 2018, 7:38 PM UTC

mattnewton wrote: post #10

danellis wrote: post #6

Earlier quoted context omitted.

It doesn't seem terribly good value for money. You can get a Nucleo-32 or Nucleo-64 for $10-15. For $23 you can get a Nucleo-144.

I guess I am comparing them more to arduino / adafruit replacements, rather than more direct manufacturer prices. I have no experience with Nucleo boards but many other boards I tried out just hadn’t no community or body of libraries to draw from, whereas the teensy is pretty popular in the makers community. In my case I happened to need to drive 1,000’s of LEDs in real-time for an art piece and not only is there goo…

There's an online IDE (which is similar in many ways to Arduino) with a whole ton of libraries, accessible from a, well, library, rather than having to hunt them down.