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|
//! PWM driver.
use core::marker::PhantomData;
use embassy_hal_internal::Peri;
use super::timer::Timer;
#[cfg(not(any(lptim_v2a, lptim_v2b)))]
use super::OutputPin;
#[cfg(any(lptim_v2a, lptim_v2b))]
use super::{channel::Channel, timer::ChannelDirection, Channel1Pin, Channel2Pin};
use super::{BasicInstance, Instance};
#[cfg(gpio_v2)]
use crate::gpio::Pull;
use crate::gpio::{AfType, AnyPin, OutputType, Speed};
use crate::time::Hertz;
/// Output marker type.
pub enum Output {}
/// Channel 1 marker type.
pub enum Ch1 {}
/// Channel 2 marker type.
pub enum Ch2 {}
/// PWM pin wrapper.
///
/// This wraps a pin to make it usable with PWM.
pub struct PwmPin<'d, T, C> {
_pin: Peri<'d, AnyPin>,
phantom: PhantomData<(T, C)>,
}
/// PWM pin config
///
/// This configures the pwm pin settings
pub struct PwmPinConfig {
/// PWM Pin output type
pub output_type: OutputType,
/// PWM Pin speed
pub speed: Speed,
/// PWM Pin pull type
#[cfg(gpio_v2)]
pub pull: Pull,
}
macro_rules! channel_impl {
($new_chx:ident, $new_chx_with_config:ident, $channel:ident, $pin_trait:ident) => {
impl<'d, T: BasicInstance> PwmPin<'d, T, $channel> {
#[doc = concat!("Create a new ", stringify!($channel), " PWM pin instance.")]
pub fn $new_chx(pin: Peri<'d, impl $pin_trait<T>>) -> Self {
critical_section::with(|_| {
pin.set_low();
set_as_af!(pin, AfType::output(OutputType::PushPull, Speed::VeryHigh));
});
PwmPin {
_pin: pin.into(),
phantom: PhantomData,
}
}
#[doc = concat!("Create a new ", stringify!($channel), " PWM pin instance with config.")]
pub fn $new_chx_with_config(pin: Peri<'d, impl $pin_trait<T>>, pin_config: PwmPinConfig) -> Self {
critical_section::with(|_| {
pin.set_low();
#[cfg(gpio_v1)]
set_as_af!(pin, AfType::output(pin_config.output_type, pin_config.speed));
#[cfg(gpio_v2)]
set_as_af!(
pin,
AfType::output_pull(pin_config.output_type, pin_config.speed, pin_config.pull)
);
});
PwmPin {
_pin: pin.into(),
phantom: PhantomData,
}
}
}
};
}
#[cfg(not(any(lptim_v2a, lptim_v2b)))]
channel_impl!(new, new_with_config, Output, OutputPin);
#[cfg(any(lptim_v2a, lptim_v2b))]
channel_impl!(new_ch1, new_ch1_with_config, Ch1, Channel1Pin);
#[cfg(any(lptim_v2a, lptim_v2b))]
channel_impl!(new_ch2, new_ch2_with_config, Ch2, Channel2Pin);
/// PWM driver.
pub struct Pwm<'d, T: Instance> {
inner: Timer<'d, T>,
}
#[cfg(not(any(lptim_v2a, lptim_v2b)))]
impl<'d, T: Instance> Pwm<'d, T> {
/// Create a new PWM driver.
pub fn new(tim: Peri<'d, T>, _output_pin: PwmPin<'d, T, Output>, freq: Hertz) -> Self {
Self::new_inner(tim, freq)
}
/// Set the duty.
///
/// The value ranges from 0 for 0% duty, to [`get_max_duty`](Self::get_max_duty) for 100% duty, both included.
pub fn set_duty(&mut self, duty: u16) {
assert!(duty <= self.get_max_duty());
self.inner.set_compare_value(duty)
}
/// Get the duty.
///
/// The value ranges from 0 for 0% duty, to [`get_max_duty`](Self::get_max_duty) for 100% duty, both included.
pub fn get_duty(&self) -> u16 {
self.inner.get_compare_value()
}
fn post_init(&mut self) {}
}
#[cfg(any(lptim_v2a, lptim_v2b))]
impl<'d, T: Instance> Pwm<'d, T> {
/// Create a new PWM driver.
pub fn new(
tim: Peri<'d, T>,
_ch1_pin: Option<PwmPin<'d, T, Ch1>>,
_ch2_pin: Option<PwmPin<'d, T, Ch2>>,
freq: Hertz,
) -> Self {
Self::new_inner(tim, freq)
}
/// Enable the given channel.
pub fn enable(&mut self, channel: Channel) {
self.inner.enable_channel(channel, true);
}
/// Disable the given channel.
pub fn disable(&mut self, channel: Channel) {
self.inner.enable_channel(channel, false);
}
/// Check whether given channel is enabled
pub fn is_enabled(&self, channel: Channel) -> bool {
self.inner.get_channel_enable_state(channel)
}
/// Set the duty for a given channel.
///
/// The value ranges from 0 for 0% duty, to [`get_max_duty`](Self::get_max_duty) for 100% duty, both included.
pub fn set_duty(&mut self, channel: Channel, duty: u16) {
assert!(duty <= self.get_max_duty());
self.inner.set_compare_value(channel, duty)
}
/// Get the duty for a given channel.
///
/// The value ranges from 0 for 0% duty, to [`get_max_duty`](Self::get_max_duty) for 100% duty, both included.
pub fn get_duty(&self, channel: Channel) -> u16 {
self.inner.get_compare_value(channel)
}
fn post_init(&mut self) {
[Channel::Ch1, Channel::Ch2].iter().for_each(|&channel| {
self.inner.set_channel_direction(channel, ChannelDirection::OutputPwm);
});
}
}
impl<'d, T: Instance> Pwm<'d, T> {
fn new_inner(tim: Peri<'d, T>, freq: Hertz) -> Self {
let mut this = Self { inner: Timer::new(tim) };
this.inner.enable();
this.set_frequency(freq);
this.post_init();
this.inner.continuous_mode_start();
this
}
/// Set PWM frequency.
///
/// Note: when you call this, the max duty value changes, so you will have to
/// call `set_duty` on all channels with the duty calculated based on the new max duty.
pub fn set_frequency(&mut self, frequency: Hertz) {
self.inner.set_frequency(frequency);
}
/// Get max duty value.
///
/// This value depends on the configured frequency and the timer's clock rate from RCC.
pub fn get_max_duty(&self) -> u16 {
self.inner.get_max_compare_value() + 1
}
}
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