rename `rp23` (?) folder to `rp235x`; fix `ci.sh` to use `rp235x` folder

1 files changed, 79 insertions, 0 deletions

diff --git a/examples/rp235x/src/bin/pwm.rs b/examples/rp235x/src/bin/pwm.rs
new file mode 100644
index 000000000..a3c0f7e49
--- /dev/null
+++ b/examples/rp235x/src/bin/pwm.rs
@@ -0,0 +1,79 @@
+//! This example shows how to use PWM (Pulse Width Modulation) in the RP235x chip.
+//!
+//! We demonstrate two ways of using PWM:
+//! 1. Via config
+//! 2. Via setting a duty cycle
+
+#![no_std]
+#![no_main]
+
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_rp::peripherals::{PIN_25, PIN_4, PWM_SLICE2, PWM_SLICE4};
+use embassy_rp::pwm::{Config, Pwm, SetDutyCycle};
+use embassy_time::Timer;
+use {defmt_rtt as _, panic_probe as _};
+
+#[embassy_executor::main]
+async fn main(spawner: Spawner) {
+    let p = embassy_rp::init(Default::default());
+    spawner.spawn(pwm_set_config(p.PWM_SLICE4, p.PIN_25)).unwrap();
+    spawner.spawn(pwm_set_dutycycle(p.PWM_SLICE2, p.PIN_4)).unwrap();
+}
+
+/// Demonstrate PWM by modifying & applying the config
+///
+/// Using the onboard led, if You are using a different Board than plain Pico2 (i.e. W variant)
+/// you must use another slice & pin and an appropriate resistor.
+#[embassy_executor::task]
+async fn pwm_set_config(slice4: PWM_SLICE4, pin25: PIN_25) {
+    let mut c = Config::default();
+    c.top = 32_768;
+    c.compare_b = 8;
+    let mut pwm = Pwm::new_output_b(slice4, pin25, c.clone());
+
+    loop {
+        info!("current LED duty cycle: {}/32768", c.compare_b);
+        Timer::after_secs(1).await;
+        c.compare_b = c.compare_b.rotate_left(4);
+        pwm.set_config(&c);
+    }
+}
+
+/// Demonstrate PWM by setting duty cycle
+///
+/// Using GP4 in Slice2, make sure to use an appropriate resistor.
+#[embassy_executor::task]
+async fn pwm_set_dutycycle(slice2: PWM_SLICE2, pin4: PIN_4) {
+    // If we aim for a specific frequency, here is how we can calculate the top value.
+    // The top value sets the period of the PWM cycle, so a counter goes from 0 to top and then wraps around to 0.
+    // Every such wraparound is one PWM cycle. So here is how we get 25KHz:
+    let desired_freq_hz = 25_000;
+    let clock_freq_hz = embassy_rp::clocks::clk_sys_freq();
+    let divider = 16u8;
+    let period = (clock_freq_hz / (desired_freq_hz * divider as u32)) as u16 - 1;
+
+    let mut c = Config::default();
+    c.top = period;
+    c.divider = divider.into();
+
+    let mut pwm = Pwm::new_output_a(slice2, pin4, c.clone());
+
+    loop {
+        // 100% duty cycle, fully on
+        pwm.set_duty_cycle_fully_on().unwrap();
+        Timer::after_secs(1).await;
+
+        // 66% duty cycle. Expressed as simple percentage.
+        pwm.set_duty_cycle_percent(66).unwrap();
+        Timer::after_secs(1).await;
+
+        // 25% duty cycle. Expressed as 32768/4 = 8192.
+        pwm.set_duty_cycle(c.top / 4).unwrap();
+        Timer::after_secs(1).await;
+
+        // 0% duty cycle, fully off.
+        pwm.set_duty_cycle_fully_off().unwrap();
+        Timer::after_secs(1).await;
+    }
+}