67 lines
1.7 KiB
Markdown
67 lines
1.7 KiB
Markdown
# Zephyr UART + LED - Nucleo G474RE
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A learning project for [Zephyr RTOS](https://zephyrproject.org/) targeting the **STM32 Nucleo G474RE** dev board! I have always seen Zephyr projects in the wild and want to document my learning process. I've used FreeRTOS in the past and want to rewrite some projects using Zephyr 🙂
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## Hardware
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| **Board** | ST Nucleo G474RE |
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| **MCU** | STM32G474RE (ARM Cortex-M4F, 170 MHz) |
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| **UART** | LPUART1 via onboard ST-Link VCP (PA2/PA3) |
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| **LED** | LD2 on PA5 |
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Connect via USB to the Nucleo's ST-Link port
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----
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## Features
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- **Interrupt-driven UART RX** - ISR writes bytes into a ring buffer
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- **Dedicated RX thread** - sleeps on a semaphore, wakes on data arrival
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- **Line accumulation** - buffers input until `\r` or `\n`
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- **Formatted output** - prints received line with length and uptime timestamp
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- **LED** - on PA5 configured via devicetree overlay (for testing)
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----
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## Getting Started
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### Prerequisites
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- [Zephyr SDK](https://docs.zephyrproject.org/latest/develop/getting_started/index.html) installed
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- `west` installed and workspace initialized
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### Build & Flash
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```bash
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west build # board is set in CMakeLists.txt
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west flash
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(optionally)
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west debug
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```
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### Serial Monitor
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Connect a terminal to the ST-Link Virtual COM Port at a baud rate of **115200**:
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Personally, I just use PuTTY!
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Type a line and press Enter:
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```
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─────────────────────────────
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│ RX: hello
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│ Len: 5, Time: 6741
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─────────────────────────────
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```
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---
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## License
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[Apache 2.0](https://www.apache.org/licenses/LICENSE-2.0) - Similar to
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