How to Use PAC (Peripheral Access Crate) and BSP (Board Support Package) in Rust

Use a BSP to get pre-configured hardware access and the PAC to interact with specific peripherals via safe abstractions. Add the BSP as a dependency in your Cargo.toml and import the peripherals to control hardware registers directly.

[dependencies]
# Replace with your specific board BSP
esp32c3-bsp = "0.1"
# The PAC is usually a transitive dependency of the BSP
# Access it via the BSP re-export or direct import if needed
esp32c3-pac = "0.1"

use esp32c3_bsp::Peripherals;
use esp32c3_bsp::prelude::*;

fn main() {
    // Initialize the board and get peripherals
    let peripherals = Peripherals::take().unwrap();
    
    // Access a specific peripheral (e.g., GPIO) via the PAC
    let io = &peripherals.GPIO;
    
    // Configure a pin as output
    io.pin[0].control().write(|w| w.output_en().set_bit());
    
    // Toggle the pin
    io.pin[0].scl().write(|w| w.set_bit());
}

The BSP is a pre-made kit that sets up your specific hardware board so you don't have to configure it from scratch. The PAC is the detailed manual that lets you talk directly to the chip's internal parts like buttons or lights. You use the BSP to start your project and the PAC to control the specific features you need.