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//! PWM input example
//!
//! This program demonstrates how to capture the parameters of the input waveform (frequency, width and duty cycle)
//! Connect PB1 and PA6 with a 1k Ohm resistor or Connect PB1 and PA8 with a 1k Ohm resistor
//! to see the output.
//!
#![no_std]
#![no_main]
use defmt::*;
use embassy_executor::Spawner;
use embassy_stm32::gpio::{Level, Output, OutputType, Pull, Speed};
use embassy_stm32::time::khz;
use embassy_stm32::timer::pwm_input::PwmInput;
use embassy_stm32::timer::simple_pwm::{PwmPin, SimplePwm};
use embassy_stm32::{Peri, bind_interrupts, peripherals, timer};
use embassy_time::Timer;
use {defmt_rtt as _, panic_probe as _};
// Connect PB1 and PA6 with a 1k Ohm resistor
#[embassy_executor::task]
async fn blinky(led: Peri<'static, peripherals::PB1>) {
let mut led = Output::new(led, Level::High, Speed::Low);
loop {
led.set_high();
Timer::after_millis(50).await;
led.set_low();
Timer::after_millis(50).await;
}
}
bind_interrupts!(struct Irqs {
TIM2 => timer::CaptureCompareInterruptHandler<peripherals::TIM2>;
});
#[embassy_executor::main]
async fn main(spawner: Spawner) {
let p = embassy_stm32::init(Default::default());
spawner.spawn(unwrap!(blinky(p.PB1)));
// Connect PA8 and PA6 with a 1k Ohm resistor
let ch1_pin = PwmPin::new(p.PA8, OutputType::PushPull);
let mut pwm = SimplePwm::new(p.TIM1, Some(ch1_pin), None, None, None, khz(1), Default::default());
pwm.ch1().set_duty_cycle_fraction(1, 4);
pwm.ch1().enable();
let mut pwm_input = PwmInput::new_ch1(p.TIM2, p.PA0, Pull::None, khz(1000));
pwm_input.enable();
loop {
Timer::after_millis(500).await;
let period = pwm_input.get_period_ticks();
let width = pwm_input.get_width_ticks();
let duty_cycle = pwm_input.get_duty_cycle();
info!(
"period ticks: {} width ticks: {} duty cycle: {}",
period, width, duty_cycle
);
}
}
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