# STM32G4 blink template

Blinks the LD2 LED (PA5) on a [Nucleo-G474RE](https://www.st.com/en/evaluation-tools/nucleo-g474re.html) using [libopencm3](https://github.com/libopencm3/libopencm3).

Set `BLINK_PORT` / `BLINK_PIN` for your board in [`src/main.c`](./src/main.c).

## Toolchain

The Nix dev shell provides:

- `arm-none-eabi-gcc` (via `gcc-arm-embedded`)
- `openocd` for flashing and debugging
- `stlink` utilities (`st-flash`, `st-info`)
- `libopencm3` built for `stm32/g4` (exposed as `$LIBOPENCM3_DIR`)

## Build

```bash
make
```

## Flash

```bash
make flash
```

This uses OpenOCD with the built-in ST-Link interface config.