64 lines
1.9 KiB
Rust
64 lines
1.9 KiB
Rust
//! PWM input example
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//!
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//! This program demonstrates how to capture the parameters of the input waveform (frequency, width and duty cycle)
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//! Connect PB1 and PA6 with a 1k Ohm resistor or Connect PB1 and PA8 with a 1k Ohm resistor
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//! to see the output.
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//!
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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_stm32::gpio::{Level, Output, OutputType, Pull, Speed};
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use embassy_stm32::time::khz;
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use embassy_stm32::timer::pwm_input::PwmInput;
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use embassy_stm32::timer::simple_pwm::{PwmPin, SimplePwm};
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use embassy_stm32::{bind_interrupts, peripherals, timer};
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use embassy_time::Timer;
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use {defmt_rtt as _, panic_probe as _};
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// Connect PB1 and PA6 with a 1k Ohm resistor
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#[embassy_executor::task]
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async fn blinky(led: peripherals::PB1) {
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let mut led = Output::new(led, Level::High, Speed::Low);
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loop {
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led.set_high();
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Timer::after_millis(50).await;
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led.set_low();
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Timer::after_millis(50).await;
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}
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}
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bind_interrupts!(struct Irqs {
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TIM2 => timer::CaptureCompareInterruptHandler<peripherals::TIM2>;
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});
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#[embassy_executor::main]
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async fn main(spawner: Spawner) {
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let p = embassy_stm32::init(Default::default());
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unwrap!(spawner.spawn(blinky(p.PB1)));
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// Connect PA8 and PA6 with a 1k Ohm resistor
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let ch1_pin = PwmPin::new_ch1(p.PA8, OutputType::PushPull);
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let mut pwm = SimplePwm::new(p.TIM1, Some(ch1_pin), None, None, None, khz(1), Default::default());
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pwm.ch1().set_duty_cycle_fraction(1, 4);
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pwm.ch1().enable();
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let mut pwm_input = PwmInput::new(p.TIM2, p.PA0, Pull::None, khz(1000));
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pwm_input.enable();
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loop {
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Timer::after_millis(500).await;
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let period = pwm_input.get_period_ticks();
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let width = pwm_input.get_width_ticks();
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let duty_cycle = pwm_input.get_duty_cycle();
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info!(
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"period ticks: {} width ticks: {} duty cycle: {}",
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period, width, duty_cycle
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);
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}
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}
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