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blinky example

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{
"nodes": {
"flake-utils": {
"inputs": {
"systems": "systems"
},
"locked": {
"lastModified": 1731533236,
"narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
"owner": "numtide",
"repo": "flake-utils",
"rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
"type": "github"
},
"original": {
"owner": "numtide",
"repo": "flake-utils",
"type": "github"
}
},
"nixpkgs": {
"locked": {
"lastModified": 1759386674,
"narHash": "sha256-wg1Lz/1FC5Q13R+mM5a2oTV9TA9L/CHHTm3/PiLayfA=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "625ad6366178f03acd79f9e3822606dd7985b657",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "nixpkgs-unstable",
"repo": "nixpkgs",
"type": "github"
}
},
"root": {
"inputs": {
"flake-utils": "flake-utils",
"nixpkgs": "nixpkgs"
}
},
"systems": {
"locked": {
"lastModified": 1681028828,
"narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
"owner": "nix-systems",
"repo": "default",
"rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
"type": "github"
},
"original": {
"owner": "nix-systems",
"repo": "default",
"type": "github"
}
}
},
"root": "root",
"version": 7
}

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{
description = "Mbed OS dev env (STM32U575ZI-Q) using mbed-tools v2 + uv";
inputs = {
nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
flake-utils.url = "github:numtide/flake-utils";
};
outputs = { self, nixpkgs, flake-utils }:
flake-utils.lib.eachSystem [
"x86_64-linux"
"aarch64-linux"
"x86_64-darwin"
"aarch64-darwin"
] (system:
let
pkgs = import nixpkgs { inherit system; };
# ARM Embedded Toolchain
armGcc =
if pkgs ? arm-none-eabi-gcc
then pkgs.arm-none-eabi-gcc
else pkgs.gcc-arm-embedded;
# Use a Python version that works well with mbed-tools today
pythonPin = "3.12";
# Wrapper: mbed-tools via uvx, pin Python and ensure setuptools is present
mbedTools = pkgs.writeShellScriptBin "mbed-tools" ''
exec ${pkgs.uv}/bin/uvx \
--python ${pythonPin} \
--with setuptools \
--from mbed-tools mbed-tools "$@"
'';
# Wrapper: pyocd via uvx, pin Python for compatibility
pyOcd = pkgs.writeShellScriptBin "pyocd" ''
exec ${pkgs.uv}/bin/uvx \
--python ${pythonPin} \
--from pyocd pyocd "$@"
'';
in {
devShells.default = pkgs.mkShell {
packages = [
pkgs.uv
pkgs.python3
pkgs.git
pkgs.mercurial
pkgs.cmake
pkgs.ninja
armGcc
pkgs.openocd
pkgs.stlink
mbedTools
pyOcd
];
# Make compiler visible for Mbed
MBED_GCC_ARM_PATH = "${armGcc}/bin";
MBED_TARGET = "NUCLEO_U575ZI_Q";
shellHook = ''
export PATH="${armGcc}/bin:$PATH"
export UV_TOOL_DIR="$PWD/.uv-tools"
echo
echo "✅ Mbed dev shell ready"
echo " - Target : $MBED_TARGET"
echo " - Compiler : ${armGcc}"
echo " - Commands : mbed-tools, pyocd, openocd, st-flash"
echo
'';
};
# nix run .#build-blinky -> builds example
apps.build-blinky = flake-utils.lib.mkApp {
drv = pkgs.writeShellScriptBin "build-blinky" ''
set -euo pipefail
export PATH="${armGcc}/bin:$PATH"
export MBED_GCC_ARM_PATH="${armGcc}/bin"
export MBED_TARGET="NUCLEO_U575ZI_Q"
workdir="mbed-os-example-blinky"
if [ ! -d "$workdir" ]; then
git clone --depth 1 \
https://github.com/ARMmbed/mbed-os-example-blinky "$workdir"
fi
cd "$workdir"
# Install deps (fetches mbed-os)
${mbedTools}/bin/mbed-tools deploy
# Configure + build
${mbedTools}/bin/mbed-tools configure \
-m "$MBED_TARGET" -t GCC_ARM
${mbedTools}/bin/mbed-tools compile \
-m "$MBED_TARGET" -t GCC_ARM -c
echo
echo "🎉 Build complete"
echo " Check BUILD/NUCLEO_U575ZI_Q/GCC_ARM/ for binaries"
echo
'';
};
});
}

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.build
.mbed
projectfiles
*.py*
# Local build directories
cmake_build/
BUILD/
mbed-os/
.mbed/
.mbedignore
*.elf
*.bin
*.hex
*.map
# IDE and temporary files
.vscode/
.idea/
*.log
*.pyc
__pycache__/

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# Copyright (c) 2020 ARM Limited. All rights reserved.
# SPDX-License-Identifier: Apache-2.0
cmake_minimum_required(VERSION 3.19.0 FATAL_ERROR)
set(MBED_PATH ${CMAKE_CURRENT_SOURCE_DIR}/mbed-os CACHE INTERNAL "")
set(MBED_CONFIG_PATH ${CMAKE_CURRENT_BINARY_DIR} CACHE INTERNAL "")
set(APP_TARGET mbed-os-example-blinky)
include(${MBED_PATH}/tools/cmake/app.cmake)
project(${APP_TARGET})
add_subdirectory(${MBED_PATH})
add_executable(${APP_TARGET})
target_sources(${APP_TARGET}
PRIVATE
main.cpp
)
target_link_libraries(${APP_TARGET}
PRIVATE
mbed-os
)
mbed_set_post_build(${APP_TARGET})
option(VERBOSE_BUILD "Have a verbose build process")
if(VERBOSE_BUILD)
set(CMAKE_VERBOSE_MAKEFILE ON)
endif()

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# Contributing to Mbed OS
Mbed OS is an open-source, device software platform for the Internet of Things. Contributions are an important part of the platform, and our goal is to make it as simple as possible to become a contributor.
To encourage productive collaboration, as well as robust, consistent and maintainable code, we have a set of guidelines for [contributing to Mbed OS](https://os.mbed.com/docs/mbed-os/latest/contributing/index.html).

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![](./resources/official_armmbed_example_badge.png)
# Blinky Mbed OS example
The example project is part of the [Arm Mbed OS Official Examples](https://os.mbed.com/code/) and is the [getting started example for Mbed OS](https://os.mbed.com/docs/mbed-os/latest/quick-start/index.html). It contains an application that repeatedly blinks an LED on supported [Mbed boards](https://os.mbed.com/platforms/).
You can build the project with all supported [Mbed OS build tools](https://os.mbed.com/docs/mbed-os/latest/tools/index.html). However, this example project specifically refers to the command-line interface tools, [Arm Mbed CLI 1](https://github.com/ARMmbed/mbed-cli#installing-mbed-cli) and [Mbed CLI 2](https://github.com/ARMmbed/mbed-tools#installation).
(Note: To see a rendered example you can import into the Arm Online Compiler, please see our [import quick start](https://os.mbed.com/docs/mbed-os/latest/quick-start/online-with-the-online-compiler.html#importing-the-code).)
## Mbed OS build tools
### Mbed CLI 2
Starting with version 6.5, Mbed OS uses Mbed CLI 2. It uses Ninja as a build system, and CMake to generate the build environment and manage the build process in a compiler-independent manner. If you are working with Mbed OS version prior to 6.5 then check the section [Mbed CLI 1](#mbed-cli-1).
1. [Install Mbed CLI 2](https://os.mbed.com/docs/mbed-os/latest/build-tools/install-or-upgrade.html).
1. From the command-line, import the example: `mbed-tools import mbed-os-example-blinky`
1. Change the current directory to where the project was imported.
### Mbed CLI 1
1. [Install Mbed CLI 1](https://os.mbed.com/docs/mbed-os/latest/quick-start/offline-with-mbed-cli.html).
1. From the command-line, import the example: `mbed import mbed-os-example-blinky`
1. Change the current directory to where the project was imported.
## Application functionality
The `main()` function is the single thread in the application. It toggles the state of a digital output connected to an LED on the board.
**Note**: This example requires a target with RTOS support, i.e. one with `rtos` declared in `supported_application_profiles` in `targets/targets.json` in [mbed-os](https://github.com/ARMmbed/mbed-os). For non-RTOS targets (usually with small memory sizes), please use [mbed-os-example-blinky-baremetal](https://github.com/ARMmbed/mbed-os-example-blinky-baremetal) instead.
## Building and running
1. Connect a USB cable between the USB port on the board and the host computer.
1. Run the following command to build the example project and program the microcontroller flash memory:
* Mbed CLI 2
```bash
$ mbed-tools compile -m <TARGET> -t <TOOLCHAIN> --flash
```
* Mbed CLI 1
```bash
$ mbed compile -m <TARGET> -t <TOOLCHAIN> --flash
```
Your PC may take a few minutes to compile your code.
The binary is located at:
* **Mbed CLI 2** - `./cmake_build/<TARGET>/develop/<TOOLCHAIN>/mbed-os-example-blinky.bin`
* **Mbed CLI 1** - `./BUILD/<TARGET>/<TOOLCHAIN>/mbed-os-example-blinky.bin`
Alternatively, you can manually copy the binary to the board, which you mount on the host computer over USB.
## Expected output
The LED on your target turns on and off every 500 milliseconds.
## Troubleshooting
If you have problems, you can review the [documentation](https://os.mbed.com/docs/latest/tutorials/debugging.html) for suggestions on what could be wrong and how to fix it.
## Related Links
* [Mbed OS Stats API](https://os.mbed.com/docs/latest/apis/mbed-statistics.html).
* [Mbed OS Configuration](https://os.mbed.com/docs/latest/reference/configuration.html).
* [Mbed OS Serial Communication](https://os.mbed.com/docs/latest/tutorials/serial-communication.html).
* [Mbed OS bare metal](https://os.mbed.com/docs/mbed-os/latest/reference/mbed-os-bare-metal.html).
* [Mbed boards](https://os.mbed.com/platforms/).
### License and contributions
The software is provided under Apache-2.0 license. Contributions to this project are accepted under the same license. Please see [CONTRIBUTING.md](./CONTRIBUTING.md) for more info.
This project contains code from other projects. The original license text is included in those source files. They must comply with our license guide.

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/* mbed Microcontroller Library
* Copyright (c) 2019 ARM Limited
* SPDX-License-Identifier: Apache-2.0
*/
#include "mbed.h"
// Blinking rate in milliseconds
#define BLINKING_RATE 500ms
int main()
{
// Initialise the digital pin LED1 as an output
#ifdef LED1
DigitalOut led(LED1);
#else
bool led;
#endif
while (true) {
led = !led;
ThisThread::sleep_for(BLINKING_RATE);
}
}

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https://github.com/ARMmbed/mbed-os/#17dc3dc2e6e2817a8bd3df62f38583319f0e4fed

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