Merge #827

827: Fix PWM for advanced timers r=Dirbaio a=chemicstry

Advanced timers have additional BDTR register, which has a global output enable bit and it is disabled by default.

Also added an example for F4, but it will only work once https://github.com/embassy-rs/stm32-data/pull/149 is merged. We can also move it to some other chip, but I don't have anything else to test on atm.

Co-authored-by: chemicstry <[email protected]>

1 files changed, 35 insertions, 0 deletions

diff --git a/examples/stm32f4/src/bin/pwm.rs b/examples/stm32f4/src/bin/pwm.rs
new file mode 100644
index 000000000..cd20c68bb
--- /dev/null
+++ b/examples/stm32f4/src/bin/pwm.rs
@@ -0,0 +1,35 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use defmt::*;
+use embassy::executor::Spawner;
+use embassy::time::{Duration, Timer};
+use embassy_stm32::pwm::simple_pwm::SimplePwm;
+use embassy_stm32::pwm::Channel;
+use embassy_stm32::time::U32Ext;
+use embassy_stm32::Peripherals;
+use {defmt_rtt as _, panic_probe as _};
+
+#[embassy::main]
+async fn main(_spawner: Spawner, p: Peripherals) {
+    info!("Hello World!");
+
+    let mut pwm = SimplePwm::new_1ch(p.TIM1, p.PE9, 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;
+    }
+}