<!-- Copyright © SixtyFPS GmbH <> ; SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-Royalty-free-1.1 OR LicenseRef-Slint-commercial --> # Slint [![Component Registry](]( Slint is a declarative GUI toolkit to build native user interfaces for desktop and embedded applications written in Rust, C++, or JavaScript. This component provides the C++ version of [Slint]( for the [Espressif IoT Development Framework]( It has been tested on ESP32-S3 devices. ![Screenshot]( ## Getting Started ### Prerequisites * Install the [Espressif IoT Development Framework]( and open a terminal or command prompt with the environment set up. On Windows, follow the [Using the Command Prompt]( instructions, on macOS and Linux, follow the [Set up the Environment Variables]( instructions. * Make sure that you have [Rust]( installed. * Install the Rust toolchains for [Espressif SoCs with Xtensa and RISC-V targets]( ### Hello World The following steps will guide from the a bare-bones esp-idf "hello_world" to a GUI with Slint. 1. Start by creating a new project: ```bash create-project slint-hello-world cd slint-hello-world ``` 2. Select your chipset with ` set-target`, for example if you're using an `ESP32S3` chipset, run ```bash set-target esp32s3` ``` 3. Add a [Board Support Package]( that matches your device as a dependency. For example, if you're using an ESP-BOX, run ```bash add-dependency esp-box ``` 4. Add Slint as a dependency: ```bash add-dependency slint/slint ``` 5. Ensure that Espressif's Rust toolchain is selected for building. Either set the `RUSTUP_TOOLCHAIN` environment variable to the value `esp` or create a file called `rust-toolchain.toml` in your project directory with the following contents: ```toml [toolchain] channel = "esp" ``` 6. Remove `main/slint-hello-world.c`. 7. Create a new file `main/slint-hello-world.cpp` with the following contents: ```cpp #include <stdio.h> #include <esp_err.h> #include <bsp/display.h> #include <bsp/esp-bsp.h> #include <slint-esp.h> #if defined(BSP_LCD_DRAW_BUFF_SIZE) # define DRAW_BUF_SIZE BSP_LCD_DRAW_BUFF_SIZE #else # define DRAW_BUF_SIZE (BSP_LCD_H_RES * CONFIG_BSP_LCD_DRAW_BUF_HEIGHT) #endif #include "appwindow.h" extern "C" void app_main(void) { /* Initialize display */ esp_lcd_panel_io_handle_t io_handle = NULL; esp_lcd_panel_handle_t panel_handle = NULL; const bsp_display_config_t bsp_disp_cfg = { .max_transfer_sz = DRAW_BUF_SIZE * sizeof(uint16_t), }; bsp_display_new(&bsp_disp_cfg, &panel_handle, &io_handle); /* Set display brightness to 100% */ bsp_display_backlight_on(); std::optional<esp_lcd_touch_handle_t> touch_handle; /* Allocate a drawing buffer */ static std::vector<slint::platform::Rgb565Pixel> buffer(BSP_LCD_H_RES * BSP_LCD_V_RES); /* Initialize Slint's ESP platform support*/ slint_esp_init(slint::PhysicalSize({ BSP_LCD_H_RES, BSP_LCD_V_RES }), panel_handle, touch_handle, buffer); /* Instantiate the UI */ auto ui = AppWindow::create(); /* Show it on the screen and run the event loop */ ui->run(); } ``` 8. Create `main/appwindow.slint` with the following contents: ``` import { VerticalBox, AboutSlint } from "std-widgets.slint"; export component AppWindow { VerticalBox { AboutSlint {} Text { text: "Hello World"; font-size: 18px; horizontal-alignment: center; } } } ``` 9. Edit `main/CMakeLists.txt` to adjust for the new `slint-hello-world.cpp`, add `slint` as required component, and instruction the build system to compile `appwindow.slint` to `appwindow.h`. The file should look like this: ```cmake idf_component_register(SRCS "slint-hello-world.cpp" INCLUDE_DIRS "." REQUIRES slint) slint_target_sources(${COMPONENT_LIB} appwindow.slint) ``` 10. Open the configuration editor with ` menuconfig`: 1. Change the stack size under `Component config --> ESP System Settings --> Main task stack size` to at least `8192`. You may need to tweak this value in the future if you run into stack overflows. 2. Add support for C++ exceptions under `Compiler Options -> Enable C++ exceptions`. 3. You may need additional device-specific settings. For example if your device has external SPI RAM, you may need to enable that. For details for ESP32-S3 based devices see how to [Configure the PSRAM]( 4. Quit the editor with `Q` and save the configuration. Alternatively, check in a default sdkconfig tweaked from your board that adds the right amount of ram, flash, and use `CONFIG_MAIN_TASK_STACK_SIZE=8192` and `CONFIG_COMPILER_CXX_EXCEPTIONS=y` 11. Build the project with ` build`. 12. Connect your device, then flash and run it with ` flash monitor`. 13. Observe Slint rendering "Hello World" on the screen 🎉. Congratulations, you're all set up to develop with Slint. For more information, check out our [online documentation]( If you have feedback or questions, feel free to reach out to the Slint community: - [Chat with us]( on Mattermost. - [Ask questions]( on GitHub - Contact us on [Twitter]( or [Mastodon]( - [Report a bug]( on Github ## Troubleshooting You may run into compile or run-time issues due to Slint's requirements. The following sections track issues we're aware of and how to solve them. ### Rust Compilation Error During Slint Build You see the following error: ``` error: the `-Z` flag is only accepted on the nightly channel of Cargo, but this is the `stable` channel ``` Solution: You need to configure your Rust toolchain to use the esp channel. Either set the `RUSTUP_TOOLCHAIN` environment variable to the value `esp` or create a file called `rust-toolchain.toml` in your project directory with the following contents: ```toml [toolchain] channel = "esp" ``` ### Error compiling Slint for ESP-IDF on Windows You see errors about `slint-compiler`: ``` Error copying file (if different) from "C:/path/build/./cargo/build/x86_64-pc-windows-msvc/release/slint-compiler" to "C:/path/build/_deps/slint-build". ``` Solution: At the moment development development on Windows while targeting ESP-IDF is not supported. We're working on a fix and in the meantime we recommend using [Windows Subsystem for Linux]( ### The device crashes at boot or enter a boot loop One reason could be that you don't have enough ram for the heap or the stack. Make sure that the stack is big enough (~8KiB), and that all the RAM was made available for the heap allocator. ## License You can use Slint under ***any*** of the following licenses, at your choice: 1. [GNU GPLv3](, 2. [Paid license]( See also the [Licensing FAQ]( Slint is also available with a third license (Royalty Free) for desktop applications. ## Links [Website]( · [GitHub]( · [Docs](

Supports all targets

License: Custom

To add this component to your project, run: add-dependency "slint/slint^1.2.1"

or download archive


  • espressif/esp_lcd_touch >=1.0.4
  • ESP-IDF >=5.1
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    slint/slint version: 1.2.1 |