75 lines
2.5 KiB
Rust
75 lines
2.5 KiB
Rust
//! # Overclocking the RP2350 to 200 MHz
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//!
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//! This example demonstrates how to configure the RP2350 to run at 200 MHz instead of the default 150 MHz.
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//!
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//! ## Note
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//!
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//! As of yet there is no official support for running the RP235x at higher clock frequencies and/or other core voltages than the default.
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//! Doing so may cause unexpected behavior and/or damage the chip.
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#![no_std]
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#![no_main]
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use defmt::*;
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use embassy_executor::Spawner;
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use embassy_rp::clocks::{clk_sys_freq, core_voltage, ClockConfig, CoreVoltage};
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use embassy_rp::config::Config;
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use embassy_rp::gpio::{Level, Output};
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use embassy_time::{Duration, Instant, Timer};
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use {defmt_rtt as _, panic_probe as _};
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const COUNT_TO: i64 = 10_000_000;
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#[embassy_executor::main]
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async fn main(_spawner: Spawner) -> ! {
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// Set up for clock frequency of 200 MHz, setting all necessary defaults.
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let mut config = Config::new(ClockConfig::system_freq(200_000_000).unwrap());
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// since for the rp235x there is no official support for higher clock frequencies, `system_freq()` will not set a voltage for us.
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// We need to guess the core voltage, that is needed for the higher clock frequency. Going with a small increase from the default 1.1V here, based on
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// what we know about the RP2040. This is not guaranteed to be correct.
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config.clocks.core_voltage = CoreVoltage::V1_15;
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// Initialize the peripherals
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let p = embassy_rp::init(config);
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// Show CPU frequency for verification
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let sys_freq = clk_sys_freq();
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info!("System clock frequency: {} MHz", sys_freq / 1_000_000);
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// Show core voltage for verification
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let core_voltage = core_voltage().unwrap();
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info!("Core voltage: {}", core_voltage);
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// LED to indicate the system is running
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let mut led = Output::new(p.PIN_25, Level::Low);
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loop {
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// Reset the counter at the start of measurement period
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let mut counter = 0;
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// Turn LED on while counting
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led.set_high();
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let start = Instant::now();
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// This is a busy loop that will take some time to complete
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while counter < COUNT_TO {
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counter += 1;
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}
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let elapsed = Instant::now() - start;
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// Report the elapsed time
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led.set_low();
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info!(
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"At {}Mhz: Elapsed time to count to {}: {}ms",
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sys_freq / 1_000_000,
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counter,
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elapsed.as_millis()
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);
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// Wait 2 seconds before starting the next measurement
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Timer::after(Duration::from_secs(2)).await;
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}
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}
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