Compile Error: microbit/src/display/doc_example.rs

[Code-Tap]

Im am struggling to get this to build, as you can see by the errors it seems to have multiple issues.

rustup update
info: syncing channel updates for 'stable-x86_64-unknown-linux-gnu'
info: syncing channel updates for 'nightly-x86_64-unknown-linux-gnu'

   stable-x86_64-unknown-linux-gnu unchanged - rustc 1.41.1 (f3e1a954d 2020-02-24)
  nightly-x86_64-unknown-linux-gnu unchanged - rustc 1.43.0-nightly (abc3073c9 2020-02-26)```

my cargo.toml

[dependencies] panic-halt = "~0.2" microbit="~0.8.0" cortex-m-rt="~0.6" cortex-m-rtfm = "0.5.1"

my memory.x

MEMORY { / NOTE K = KiBi = 1024 bytes / FLASH : ORIGIN = 0x00000000, LENGTH = 256K RAM : ORIGIN = 0x20000000, LENGTH = 16K }

thanks for any help you can give to get this running

[therealprof]

Hm, what is microbit-blinky? Judging from the error message I have a suspicion that you're using parts of the example code was written for an older version of cortex-m-rtfm than the version you're using. Try downgrading the version.

[Code-Tap]

microbit-blinky was a tutorial i was following in 2 places : https://flames-of-code.netlify.com/blog/rust-microbit/ https://droogmic.github.io/microrust/getting-started/01.00.BUILD.html

but i couldn't get the first one to work, so i came to the crate and tried to find a working example. edit: Got the 2nd one to build ( just an empty main loop ) they had a critical line commented out in the linker, but made no mention of it.

i immediately came back and tried to re-compile this one, I dropped to an older rtfm ( cortex-m-rtfm = "0.4.2" ) and progressively tried recompiling with every version of microbit crate available in reverse order. none worked

one positive is that one error and 2 warnings have now dissapeared.

here is whats left

error[E0433]: failed to resolve: could not find `display` in `microbit`
  --> src/main.rs:18:16
   |
18 |  use microbit::display::image::GreyscaleImage;
   |                ^^^^^^^ could not find `display` in `microbit`

error[E0432]: unresolved imports `microbit::display`, `microbit::display`
  --> src/main.rs:19:26
   |
19 |  use microbit::display::{self, Display, Frame, MicrobitDisplayTimer, MicrobitFrame};
   |                ^^^^^^^   ^^^^ no `display` in the root
   |                |
   |                could not find `display` in `microbit`

error[E0433]: failed to resolve: use of undeclared type or module `GreyscaleImage`
  --> src/main.rs:26:6
   |
26 |      GreyscaleImage::new(&[
   |      ^^^^^^^^^^^^^^ use of undeclared type or module `GreyscaleImage`

error[E0412]: cannot find type `GreyscaleImage` in this scope
  --> src/main.rs:24:42
   |
24 |  fn heart_image(inner_brightness: u8) -> GreyscaleImage {
   |                                          ^^^^^^^^^^^^^^ not found in this scope

error: aborting due to 4 previous errors

[therealprof]

There's an example for making the display work right in this crate: https://github.com/therealprof/microbit/blob/master/examples/led_nonblocking.rs

If you check out the the repository you should be able to compile it via:

cargo build --release --example led_nonblocking

and then we can take it from there?

[therealprof]

I've now moved the example from the doc_example directly to an example and added the correct dependency to the dev-dependencies so this can be built out of the box.

https://github.com/therealprof/microbit/blob/master/examples/led_rtfm.rs

Hope that helps.

[Code-Tap]

Thats brilliant! Thanks for responding so quickly. I will have a go later when im back to my computer. I cant wait to do some speed comparisons compared to microython.

[therealprof]

No problem.

[Code-Tap]

Huzzah!!!

~/Projects/rustlang
❯ cd microbit

microbit on  master is 📦 v0.8.0 via 🦀 v1.41.1
❯ cargo build
    Updating crates.io index
   Compiling semver-parser v0.7.0
   Compiling typenum v1.11.2
   Compiling proc-macro2 v1.0.9
   Compiling unicode-xid v0.2.0
   Compiling cortex-m v0.6.2
   Compiling syn v1.0.16
   Compiling stable_deref_trait v1.1.1
   Compiling cortex-m-rt v0.6.12
   Compiling vcell v0.1.2
   Compiling fpa v0.1.0
   Compiling r0 v0.2.2
   Compiling nrf51 v0.7.0
   Compiling void v1.0.2
   Compiling nb v0.1.2
   Compiling microbit v0.8.0 (~/Projects/rustlang/microbit)
   Compiling tiny-led-matrix v1.0.2
   Compiling semver v0.9.0
   Compiling volatile-register v0.2.0
   Compiling embedded-hal v0.2.3
   Compiling rustc_version v0.2.3
   Compiling quote v1.0.2
   Compiling generic-array v0.13.2
   Compiling generic-array v0.12.3
   Compiling bare-metal v0.2.5
   Compiling cast v0.2.3
   Compiling as-slice v0.1.3
   Compiling aligned v0.3.2
   Compiling cortex-m-rt-macros v0.1.8
   Compiling nrf51-hal v0.7.1
    Finished dev [unoptimized + debuginfo] target(s) in 52.06s

microbit on  master is 📦 v0.8.0 via 🦀 v1.41.1 took 52s
❯

[therealprof]

Well, you haven't built any examples yet. ;) Try:

cargo build --release --examples

[Code-Tap]

Another success! found the built files here

microbit/target/thumbv6m-none-eabi/release/examples

Just got to read up on transferring the code to the microbit and running it now! did'nt expect to get this far this fast!

[Code-Tap]

I feel like I have superpowers tonight You've been amazing and I feel I'm now in a place where I can really start learning about rust and embedded.