add hf timer example for g0

examples/stm32g0/src/bin/hf_timer.rs

@@ -0,0 +1,69 @@
+#![no_std]
+#![no_main]
+
+use defmt::info;
+use {defmt_rtt as _, panic_probe as _};
+
+use embassy_executor::Spawner;
+use embassy_stm32::{
+    gpio::OutputType,
+    pac,
+    pac::rcc::vals::Tim1sel,
+    rcc::{ClockSrc, Config as RccConfig, PllConfig, PllSource, Pllm, Plln, Pllq, Pllr},
+    time::khz,
+    timer::{
+        complementary_pwm::{ComplementaryPwm, ComplementaryPwmPin},
+        simple_pwm::PwmPin,
+        Channel,
+    },
+    Config as PeripheralConfig,
+};
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let mut rcc_config = RccConfig::default();
+    rcc_config.mux = ClockSrc::PLL(PllConfig {
+        source: PllSource::HSI,
+        m: Pllm::DIV1,
+        n: Plln::MUL16,
+        r: Pllr::DIV4,       // CPU clock comes from PLLR (HSI (16MHz) / 1 * 16 / 4 = 64MHz)
+        q: Some(Pllq::DIV2), // TIM1 or TIM15 can be sourced from PLLQ (HSI (16MHz) / 1 * 16 / 2 = 128MHz)
+        p: None,
+    });
+
+    let mut peripheral_config = PeripheralConfig::default();
+    peripheral_config.rcc = rcc_config;
+
+    let p = embassy_stm32::init(peripheral_config);
+
+    // configure TIM1 mux to select PLLQ as clock source
+    // https://www.st.com/resource/en/reference_manual/rm0444-stm32g0x1-advanced-armbased-32bit-mcus-stmicroelectronics.pdf
+    // RM0444 page 210
+    // RCC - Peripherals Independent Clock Control Register - bit 22 -> 1
+    pac::RCC.ccipr().modify(|w| w.set_tim1sel(Tim1sel::PLL1_Q));
+
+    let ch1 = PwmPin::new_ch1(p.PA8, OutputType::PushPull);
+    let ch1n = ComplementaryPwmPin::new_ch1(p.PA7, OutputType::PushPull);
+
+    let mut pwm = ComplementaryPwm::new(
+        p.TIM1,
+        Some(ch1),
+        Some(ch1n),
+        None,
+        None,
+        None,
+        None,
+        None,
+        None,
+        khz(512),
+        Default::default(),
+    );
+
+    let max = pwm.get_max_duty();
+    info!("Max duty: {}", max);
+
+    pwm.set_duty(Channel::Ch1, max / 2);
+    pwm.enable(Channel::Ch1);
+
+    loop {}
+}