Add overclocking test for RP2040 with timer and PWM tests at 200Mhz

tests/rp/src/bin/overclock.rs

@@ -0,0 +1,62 @@
+#![no_std]
+#![no_main]
+#[cfg(feature = "rp2040")]
+teleprobe_meta::target!(b"rpi-pico");
+
+use defmt::{assert, assert_eq, info};
+use embassy_executor::Spawner;
+use embassy_rp::config::Config;
+use embassy_rp::gpio::{Input, Pull};
+use embassy_rp::pwm::{Config as PwmConfig, Pwm};
+use embassy_time::{Instant, Timer};
+use {defmt_rtt as _, panic_probe as _};
+
+#[cfg(feature = "rp2040")]
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    // Initialize with 200MHz clock configuration for RP2040
+    let mut config = Config::default();
+    config.clocks = embassy_rp::clocks::ClockConfig::at_sys_frequency_mhz(200);
+
+    let p = embassy_rp::init(config);
+
+    info!("RP2040 overclocked to 200MHz!");
+    info!("System clock frequency: {} Hz", embassy_rp::clocks::clk_sys_freq());
+
+    // Test 1: Timer accuracy at 200MHz
+    info!("Testing timer accuracy at 200MHz...");
+    let start = Instant::now();
+    Timer::after_millis(100).await;
+    let end = Instant::now();
+    let ms = (end - start).as_millis();
+    info!("slept for {} ms", ms);
+    assert!(ms >= 99);
+    assert!(ms < 110);
+    info!("Timer test passed!");
+
+    // Test 2: PWM functionality at 200MHz
+    info!("Testing PWM functionality at 200MHz...");
+    let pwm_cfg = {
+        let mut c = PwmConfig::default();
+        c.divider = ((embassy_rp::clocks::clk_sys_freq() / 1_000_000) as u8).into();
+        c.top = 10000;
+        c.compare_a = 5000;
+        c.compare_b = 5000;
+        c
+    };
+
+    // Test PWM output
+    let pin1 = Input::new(p.PIN_9, Pull::None);
+    let _pwm = Pwm::new_output_a(p.PWM_SLICE3, p.PIN_6, pwm_cfg);
+    Timer::after_millis(1).await;
+    let initial_state = pin1.is_low();
+    Timer::after_millis(5).await;
+    assert_eq!(pin1.is_high(), initial_state);
+    Timer::after_millis(5).await;
+    assert_eq!(pin1.is_low(), initial_state);
+    info!("PWM test passed!");
+
+    info!("All tests passed at 200MHz!");
+    info!("Overclock test successful");
+    cortex_m::asm::bkpt();
+}