Merge pull request #125 from thalesfragoso/pwm-impl

PWM implementation

Author: therealprof

CHANGELOG.md

@@ -10,10 +10,12 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Changed
 
 - Wait 16 cycles after setting prescalers for some clock domains to follow manual.
+- Fixed `TIM9` `pclk` and `ppre`.
 
 ### Added
 
 - Implement `timer::Cancel` trait for `Timer<SYST>`.
+- Added PWM support and example.
 
 ## [v0.7.0] - 2020-03-07
 

examples/pwm.rs

@@ -0,0 +1,35 @@
+#![deny(unsafe_code)]
+#![no_main]
+#![no_std]
+
+// Halt on panic
+use panic_halt as _;
+
+use cortex_m;
+use cortex_m_rt::entry;
+use stm32f4xx_hal::{prelude::*, pwm, stm32};
+
+#[entry]
+fn main() -> ! {
+    if let Some(dp) = stm32::Peripherals::take() {
+        // Set up the system clock.
+        let rcc = dp.RCC.constrain();
+        let clocks = rcc.cfgr.freeze();
+
+        let gpioa = dp.GPIOA.split();
+        let channels = (
+            gpioa.pa8.into_alternate_af1(),
+            gpioa.pa9.into_alternate_af1(),
+        );
+
+        let pwm = pwm::tim1(dp.TIM1, channels, clocks, 20u32.khz());
+        let (mut ch1, _ch2) = pwm;
+        let max_duty = ch1.get_max_duty();
+        ch1.set_duty(max_duty / 2);
+        ch1.enable();
+    }
+
+    loop {
+        cortex_m::asm::nop();
+    }
+}

src/lib.rs

@@ -138,6 +138,8 @@ pub mod rng;
 #[cfg(feature = "device-selected")]
 pub mod prelude;
 #[cfg(feature = "device-selected")]
+pub mod pwm;
+#[cfg(feature = "device-selected")]
 pub mod qei;
 #[cfg(feature = "device-selected")]
 pub mod rcc;