Module esp32_hal::cpu_control

Control CPU Cores (ESP32)

Overview

This module provides essential functionality for controlling and managing the APP (second) CPU core on the ESP32 chip. It is used to start and stop program execution on the APP core.

Example

static mut APP_CORE_STACK: Stack<8192> = Stack::new();

let counter = Mutex::new(RefCell::new(0));

let mut cpu_control = CpuControl::new(system.cpu_control);
let cpu1_fnctn = || {
    cpu1_task(&mut timer1, &counter);
};
let _guard = cpu_control
    .start_app_core(unsafe { &mut APP_CORE_STACK }, cpu1_fnctn)
    .unwrap();

loop {
    block!(timer0.wait()).unwrap();

    let count = critical_section::with(|cs| *counter.borrow_ref(cs));
    println!("Hello World - Core 0! Counter is {}", count);
}

Where cpu1_task() may be defined as:

fn cpu1_task(
    timer: &mut Timer<Timer0<TIMG1>>,
    counter: &critical_section::Mutex<RefCell<i32>>,
) -> ! {
    println!("Hello World - Core 1!");
    loop {
        block!(timer.wait()).unwrap();

        critical_section::with(|cs| {
            let new_val = counter.borrow_ref_mut(cs).wrapping_add(1);
            *counter.borrow_ref_mut(cs) = new_val;
        });
    }
}

Structs

• AppCoreGuard
  Will park the APP (second) core when dropped
• CpuControl
  Control CPU Cores
• Stack
  Data type for a properly aligned stack of N bytes

Enums

• Error