examples: add low-power examples for `stm32wlex`

1 files changed, 96 insertions, 0 deletions

diff --git a/examples/stm32wle5/src/bin/button_exti.rs b/examples/stm32wle5/src/bin/button_exti.rs
new file mode 100644
index 000000000..dfa391a81
--- /dev/null
+++ b/examples/stm32wle5/src/bin/button_exti.rs
@@ -0,0 +1,96 @@
+#![no_std]
+#![no_main]
+
+use defmt::*;
+#[cfg(feature = "defmt-rtt")]
+use defmt_rtt as _;
+use embassy_executor::Spawner;
+use embassy_stm32::exti::ExtiInput;
+use embassy_stm32::gpio::Pull;
+use embassy_stm32::low_power::Executor;
+use embassy_stm32::rtc::{Rtc, RtcConfig};
+use panic_probe as _;
+use static_cell::StaticCell;
+
+#[cortex_m_rt::entry]
+fn main() -> ! {
+    info!("main: Starting!");
+    Executor::take().run(|spawner| {
+        spawner.spawn(unwrap!(async_main(spawner)));
+    });
+}
+
+#[embassy_executor::task]
+async fn async_main(_spawner: Spawner) {
+    let mut config = embassy_stm32::Config::default();
+    // enable HSI clock
+    config.rcc.hsi = true;
+    // enable LSI clock for RTC
+    config.rcc.ls = embassy_stm32::rcc::LsConfig::default_lsi();
+    config.rcc.msi = Some(embassy_stm32::rcc::MSIRange::RANGE4M);
+    config.rcc.sys = embassy_stm32::rcc::Sysclk::MSI;
+    // enable ADC with HSI clock
+    config.rcc.mux.adcsel = embassy_stm32::pac::rcc::vals::Adcsel::HSI;
+    #[cfg(feature = "defmt-serial")]
+    {
+        // disable debug during sleep to reduce power consumption since we are
+        // using defmt-serial on LPUART1.
+        config.enable_debug_during_sleep = false;
+        // if we are using defmt-serial on LPUART1, we need to use HSI for the clock
+        // so that its registers are preserved during STOP modes.
+        config.rcc.mux.lpuart1sel = embassy_stm32::pac::rcc::vals::Lpuart1sel::HSI;
+    }
+    // Initialize STM32WL peripherals (use default config like wio-e5-async example)
+    let p = embassy_stm32::init(config);
+
+    // start with all GPIOs as analog to reduce power consumption
+    for r in [
+        embassy_stm32::pac::GPIOA,
+        embassy_stm32::pac::GPIOB,
+        embassy_stm32::pac::GPIOC,
+        embassy_stm32::pac::GPIOH,
+    ] {
+        r.moder().modify(|w| {
+            for i in 0..16 {
+                // don't reset these if probe-rs should stay connected!
+                #[cfg(feature = "defmt-rtt")]
+                if config.enable_debug_during_sleep && r == embassy_stm32::pac::GPIOA && [13, 14].contains(&i) {
+                    continue;
+                }
+                w.set_moder(i, embassy_stm32::pac::gpio::vals::Moder::ANALOG);
+            }
+        });
+    }
+    #[cfg(feature = "defmt-serial")]
+    {
+        use embassy_stm32::mode::Blocking;
+        use embassy_stm32::usart::Uart;
+        let mut config = embassy_stm32::usart::Config::default();
+        config.baudrate = 115200;
+        config.assume_noise_free = true;
+        config.detect_previous_overrun = true;
+        let uart = Uart::new_blocking(p.LPUART1, p.PC0, p.PC1, config).expect("failed to configure UART!");
+        static SERIAL: StaticCell<Uart<'static, Blocking>> = StaticCell::new();
+        defmt_serial::defmt_serial(SERIAL.init(uart));
+    }
+
+    // give the RTC to the low_power executor...
+    let rtc_config = RtcConfig::default();
+    let rtc = Rtc::new(p.RTC, rtc_config);
+    static RTC: StaticCell<Rtc> = StaticCell::new();
+    let rtc = RTC.init(rtc);
+    embassy_stm32::low_power::stop_with_rtc(rtc);
+
+    info!("Hello World!");
+
+    let mut button = ExtiInput::new(p.PA0, p.EXTI0, Pull::Up);
+
+    info!("Press the USER button...");
+
+    loop {
+        button.wait_for_falling_edge().await;
+        info!("Pressed!");
+        button.wait_for_rising_edge().await;
+        info!("Released!");
+    }
+}