branan / teensy Goto Github PK

Thanks for writing this guide!

I was able to get everything running on macOS with only a few minor changes.

To install the linker et. al., I used the homebrew package manager.
brew cask install gcc-arm-embedded

Also my teensy loader was teensy_loader_cli rather than teensy-loader-cli so I had to change that. Looking at the documents over at pjrc I see that the documentation for Linux uses underscores as well, so Linux users on other distros may run into the same issue I did.

Now on to figuring out interrupts... I'm looking forward to your next post.

I'm reading the Bootup to LED post and I'm curious where these numbers come from? Could you please document the source code with comments, that show where these values come from?

You mention "Teensy Arduino tooling" but googling this wasn't helpful.

pub static _FLASHCONFIG: [u8; 16] = [
    0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
    0xFF, 0xFF, 0xFF, 0xFF, 0xDE, 0xF9, 0xFF, 0xFF
];```

https://github.com/branan/teensy/blob/master/src/main.rs#L108

I'm seeing problems with clippy at the moment, will disable it locally and continue. Let me know if there is a workaround.

error[E0004]: non-exhaustive patterns: Catch(_) not covered
--> C:\Users\pauli.cargo\registry\src\github.com-1ecc6299db9ec823\clippy_lints-0.0.119\src\utils\sugg.rs:90:15
|
90 | match expr.node {
| ^^^^^^^^^ pattern Catch(_) not covered

To make examples work I had to change the __NOP in the watchdog to __nop.

I've been following through your tutorial on a fresh Ubuntu installation. By the time that I got to the makefile I thought that I'd build the project, despite the fact that it wouldn't do anything useful, just to check that it was all working. It quickly bailed out with the message:

~/.cargo/bin/xargo build --target=thumbv7em-none-eabi --release
error: couldn't walk the sysroot
caused by: IO error for operation on /home/tobz/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src: No such file or directory (os error 2)
caused by: No such file or directory (os error 2)
note: run with `RUST_BACKTRACE=1` for a backtrace
Makefile:10: recipe for target 'target/thumbv7em-none-eabi/release/teensy' failed
make: *** [target/thumbv7em-none-eabi/release/teensy] Error 1

I started poking into the toolchain path it mentions, and got as far as rustlib, but it didn't have a src folder. The tool setup near the top of the page lists:

$ rustup component add rust-src
$ rustup toolchain install nightly
$ cargo install xargo

seeing the first line mention something about src, I re-ran that line, and then tried make again, at which point it worked fine. Given the paths involved, I'm guessing that the component & toolchain lines just need to be swapped.

Have you found an effective way to thread::sleep(Duration::from_millis(4000))
without the standard lib?

I believe this is now phased as an error...maybe an easy trick would be to disable the warning....
error: reference to packed field is unaligned
as this (excellent) tutorial is not related to this issue at first...but then maybe worth coding it according to this new rule anyway ? :)