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//! # Overclocking the RP2040 to 200 MHz manually
//!
//! This example demonstrates how to manually 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, core_voltage, ClockConfig, CoreVoltage, PllConfig};
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;
/// Configure the RP2040 for 200 MHz operation by manually specifying the PLL settings.
fn configure_manual_overclock() -> Config {
// Set the PLL configuration manually, starting from default values
let mut config = Config::default();
// Set the system clock to 200 MHz
config.clocks = ClockConfig::manual_pll(
12_000_000, // Crystal frequency, 12 MHz is common. If using custom, set to your value.
PllConfig {
refdiv: 1, // Reference divider
fbdiv: 100, // Feedback divider
post_div1: 3, // Post divider 1
post_div2: 2, // Post divider 2
},
CoreVoltage::V1_15, // Core voltage, should be set to V1_15 for 200 MHz
);
config
}
#[embassy_executor::main]
async fn main(_spawner: Spawner) -> ! {
// Initialize with our manual overclock configuration
let p = embassy_rp::init(configure_manual_overclock());
// Show CPU frequency for verification
let sys_freq = clk_sys_freq();
info!("System clock frequency: {} MHz", sys_freq / 1_000_000);
// Show core voltage for verification
let core_voltage = core_voltage().unwrap();
info!("Core voltage: {}", core_voltage);
// 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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