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... using metadata from the build script send with the DEP_I_SLINT_BACKEND_MCU Saves two environment variable that we don't have to pass
101 lines
3.2 KiB
Markdown
101 lines
3.2 KiB
Markdown
**NOTE**: This library is an **internal** crate of the [Slint project](https://slint-ui.com).
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This crate should **not be used directly** by applications using Slint.
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You should use the `slint` crate instead.
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**WARNING**: This crate does not follow the semver convention for versioning and can
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only be used with `version = "=x.y.z"` in Cargo.toml.
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# Slint MCU backend
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The MCU backend is still a work in progress.
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We are currently working on getting demo running with the [Raspberry Pi Pico](https://www.raspberrypi.com/products/raspberry-pi-pico/)
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and [ST7789 based screen](https://www.waveshare.com/pico-restouch-lcd-2.8.htm).
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The Raspberry Pi Pico uses a RP2040 micro-controller which has 264KB of RAM and 2MB of flash memory.
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The other backend is the simulator which is a way to test the software rendering backend on desktop.
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## How to use
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In order to use this backend, the final program must depend on both `slint` and `i_slint_backend_mcu`.
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The main.rs will look something like this
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```rust,ignore
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#![no_std]
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#![cfg_attr(not(feature = "simulator"), no_main)]
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slint::include_modules!();
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#[i_slint_backend_mcu::entry]
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fn main() -> ! {
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i_slint_backend_mcu::init();
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MainWindow::new().run();
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panic!("The event loop should not return");
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}
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```
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Since i_slint_backend_mcu is at the moment an internal crate not uploaded to crates.io, you must
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use the git version of slint, slint-build, and i_slint_backend_mcu
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```toml
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[dependencies]
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slint = { git = "https://github.com/slint-ui/slint" }
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i_slint_backend_mcu = { git = "https://github.com/slint-ui/slint" }
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# ...
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[build-dependencies]
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slint-build = { git = "https://github.com/slint-ui/slint" }
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```
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## Run the demo:
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We must tell the compiler what font sizes to embed in the final binary with the SLINT_FONT_SIZES environment variable.
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```sh
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export SLINT_FONT_SIZES=8,11,10,12,13,14,15,16,18,20,22,24,32
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```
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### The simulator
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```sh
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cargo run -p printerdemo_mcu --features=i-slint-backend-mcu/simulator --release
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```
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### On the Raspberry Pi Pico
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You need nightly rust because that's the only way to get an allocator.
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Build the demo with:
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```sh
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cargo +nightly build -p printerdemo_mcu --features=mcu-pico-st7789 --target=thumbv6m-none-eabi --release
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```
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You should process the file with [elf2uf2-rs](https://github.com/jonil/elf2uf2-rs)
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```sh
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cargo install elf2uf2-rs
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elf2uf2-rs target/thumbv6m-none-eabi/release/printerdemo_mcu
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```
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Then upload the demo to the raspberry pi: push the "bootsel" white button on the device while connecting the
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micro-usb cable to the device, this connect some storage where you can store the binary.
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Or from the command on linux: (connect the device while pressing the "bootsel" button.
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```
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# mount the device
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udisksctl mount -b /dev/sda1
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# upload
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elf2uf2-rs -d target/thumbv6m-none-eabi/release/printerdemo_mcu
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```
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#### Using probe-run
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This require [probe-run](https://github.com/knurling-rs/probe-run) (`cargo install probe-run`)
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and to connect the pico via a probe (for example another pico running the probe)
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Then you can simply run with `cargo run`
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```sh
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CARGO_TARGET_THUMBV6M_NONE_EABI_LINKER="flip-link" CARGO_TARGET_THUMBV6M_NONE_EABI_RUNNER="probe-run --chip RP2040" cargo +nightly run -p printerdemo_mcu --features=mcu-pico-st7789 --target=thumbv6m-none-eabi --release
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```
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