Add simple PWM, add PWM pin definitions also accessible from low-level API.

embassy-stm32/src/pwm/simple_pwm.rs

@@ -0,0 +1,80 @@
+use crate::{
+    pwm::{pins::*, CaptureCompareCapable16bitInstance, Channel, OutputCompareMode},
+    time::Hertz,
+};
+use core::marker::PhantomData;
+use embassy::util::Unborrow;
+use embassy_hal_common::unborrow;
+
+pub struct SimplePwm<'d, T> {
+    phantom: PhantomData<&'d mut T>,
+    inner: T,
+}
+
+impl<'d, T: CaptureCompareCapable16bitInstance> SimplePwm<'d, T> {
+    pub fn new<F: Into<Hertz>>(
+        tim: impl Unborrow<Target = T> + 'd,
+        ch1: impl Unborrow<Target = impl Channel1Pin<T>> + 'd,
+        ch2: impl Unborrow<Target = impl Channel2Pin<T>> + 'd,
+        ch3: impl Unborrow<Target = impl Channel3Pin<T>> + 'd,
+        ch4: impl Unborrow<Target = impl Channel4Pin<T>> + 'd,
+        freq: F,
+    ) -> Self {
+        unborrow!(tim, ch1, ch2, ch3, ch4);
+
+        T::enable();
+        <T as crate::rcc::sealed::RccPeripheral>::reset();
+
+        unsafe {
+            ch1.configure();
+            ch2.configure();
+            ch3.configure();
+            ch4.configure();
+        }
+
+        let mut this = Self {
+            inner: tim,
+            phantom: PhantomData,
+        };
+
+        this.inner.set_frequency(freq);
+        this.inner.start();
+
+        unsafe {
+            this.inner
+                .set_output_compare_mode(Channel::Ch1, OutputCompareMode::PwmMode1);
+            this.inner
+                .set_output_compare_mode(Channel::Ch2, OutputCompareMode::PwmMode1);
+            this.inner
+                .set_output_compare_mode(Channel::Ch3, OutputCompareMode::PwmMode1);
+            this.inner
+                .set_output_compare_mode(Channel::Ch4, OutputCompareMode::PwmMode1);
+        }
+        this
+    }
+
+    pub fn enable(&mut self, channel: Channel) {
+        unsafe {
+            self.inner.enable_channel(channel, true);
+        }
+    }
+
+    pub fn disable(&mut self, channel: Channel) {
+        unsafe {
+            self.inner.enable_channel(channel, false);
+        }
+    }
+
+    pub fn set_freq<F: Into<Hertz>>(&mut self, freq: F) {
+        self.inner.set_frequency(freq);
+    }
+
+    pub fn get_max_duty(&self) -> u16 {
+        unsafe { self.inner.get_max_compare_value() }
+    }
+
+    pub fn set_duty(&mut self, channel: Channel, duty: u16) {
+        assert!(duty < self.get_max_duty());
+        unsafe { self.inner.set_compare_value(channel, duty) }
+    }
+}