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//! # Overclocking the RP2040 to 200 MHz
//!
//! This example demonstrates how to configure the RP2040 to run at 200 MHz.
#![no_std]
#![no_main]
use defmt::*;
use embassy_executor::Spawner;
use embassy_rp::clocks::{clk_sys_freq, ClockConfig};
use embassy_rp::config::Config;
use embassy_rp::gpio::{Level, Output};
use embassy_time::{Duration, Instant, Timer};
use {defmt_rtt as _, panic_probe as _};
const COUNT_TO: i64 = 10_000_000;
#[embassy_executor::main]
async fn main(_spawner: Spawner) -> ! {
// Set up for clock frequency of 200 MHz, setting all necessary defaults.
let config = Config::new(ClockConfig::crystal_freq(200_000_000));
// Show the voltage scale for verification
info!("System core voltage: {}", Debug2Format(&config.clocks.core_voltage));
// Initialize the peripherals
let p = embassy_rp::init(config);
// Show CPU frequency for verification
let sys_freq = clk_sys_freq();
info!("System clock frequency: {} MHz", sys_freq / 1_000_000);
// LED to indicate the system is running
let mut led = Output::new(p.PIN_25, Level::Low);
loop {
// Reset the counter at the start of measurement period
let mut counter = 0;
// Turn LED on while counting
led.set_high();
let start = Instant::now();
// This is a busy loop that will take some time to complete
while counter < COUNT_TO {
counter += 1;
}
let elapsed = Instant::now() - start;
// Report the elapsed time
led.set_low();
info!(
"At {}Mhz: Elapsed time to count to {}: {}ms",
sys_freq / 1_000_000,
counter,
elapsed.as_millis()
);
// Wait 2 seconds before starting the next measurement
Timer::after(Duration::from_secs(2)).await;
}
}
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