# 02_esp-gen-no-std

This is an example of using ESP-IDF using no std.
When flashed to a device, the application just adjusts the intensity of the on-board LED for visual verification that flashing works correctly.

Steps used to generate this project

```bash
cargo install esp-generate
esp-generate --chip esp32 esp-gen-no-std
```

You will also need to install [probe-rs](https://probe.rs/docs/getting-started/installation/)

```bash
curl --proto '=https' --tlsv1.2 -LsSf https://github.com/probe-rs/probe-rs/releases/latest/download/probe-rs-tools-installer.sh | sh
```

Steps to build and flash this project

```bash
# Install espflash if you don't have it already
cargo install espflash

# Export esp-idf build environment
. ~/export-esp.sh

# Build and flash to the device
cargo build
cargo run
```

If you encounter this error during the build, you need to export the esp-idf build environment with `. ~/export-esp.sh`

```bash
error: linker `xtensa-esp32-elf-gcc` not found
  |
  = note: No such file or directory (os error 2)

error: could not compile `03_esp-gen-no-std` (bin "esp-gen-test") due to 1 previous error
```

For more detailed information on setting up a development environment, see [the esp/rust README](/esp/rust/README.md)