Port the PWM example to H7, add low-level API example implementing 32-bit PWM.

examples/stm32h7/src/bin/pwm.rs

@@ -0,0 +1,48 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+use embassy::executor::Spawner;
+use embassy::time::{Duration, Timer};
+use embassy_stm32::gpio::NoPin;
+use embassy_stm32::pwm::{simple_pwm::SimplePwm, Channel};
+use embassy_stm32::time::U32Ext;
+use embassy_stm32::{Config, Peripherals};
+use example_common::*;
+
+pub fn config() -> Config {
+    let mut config = Config::default();
+    config.rcc.sys_ck = Some(400.mhz().into());
+    config.rcc.hclk = Some(400.mhz().into());
+    config.rcc.pll1.q_ck = Some(100.mhz().into());
+    config.rcc.pclk1 = Some(100.mhz().into());
+    config.rcc.pclk2 = Some(100.mhz().into());
+    config.rcc.pclk3 = Some(100.mhz().into());
+    config.rcc.pclk4 = Some(100.mhz().into());
+    config
+}
+
+#[embassy::main(config = "config()")]
+async fn main(_spawner: Spawner, p: Peripherals) {
+    info!("Hello World!");
+
+    let mut pwm = SimplePwm::new(p.TIM3, p.PA6, NoPin, NoPin, NoPin, 10000.hz());
+    let max = pwm.get_max_duty();
+    pwm.enable(Channel::Ch1);
+
+    info!("PWM initialized");
+    info!("PWM max duty {}", max);
+
+    loop {
+        pwm.set_duty(Channel::Ch1, 0);
+        Timer::after(Duration::from_millis(300)).await;
+        pwm.set_duty(Channel::Ch1, max / 4);
+        Timer::after(Duration::from_millis(300)).await;
+        pwm.set_duty(Channel::Ch1, max / 2);
+        Timer::after(Duration::from_millis(300)).await;
+        pwm.set_duty(Channel::Ch1, max - 1);
+        Timer::after(Duration::from_millis(300)).await;
+    }
+}