From std to no_std

We have successfully flashed and run our first program, which creates a blinking effect. However, we have not yet explored the code or the project structure in detail. In this section, we will recreate the same project from scratch. I will explain each part of the code and configuration along the way. Are you ready for the challenge?

Tip

If you find this chapter overwhelming, especially if you’re just working on a hobby project, feel free to skip it for now. You can come back to it later after building some fun projects and working through exercises.

Create a Fresh Project

We will start by creating a standard Rust binary project. Use the following command:

#![allow(unused)]
fn main() {
cargo new pico-from-scratch
}

At this stage, the project will contain the usual files as expected.

├── Cargo.toml
└── src
    └── main.rs

Our goal is to reach the following final project structure:

├── build.rs
├── .cargo
│   └── config.toml
├── Cargo.toml
├── memory.x
├── rp235x_riscv.x
├── src
│   └── main.rs