stm32l5: add low-power stop example

1 files changed, 61 insertions, 0 deletions

diff --git a/examples/stm32l5/src/bin/stop.rs b/examples/stm32l5/src/bin/stop.rs
new file mode 100644
index 000000000..21b30a266
--- /dev/null
+++ b/examples/stm32l5/src/bin/stop.rs
@@ -0,0 +1,61 @@
+#![no_std]
+#![no_main]
+
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_stm32::gpio::{Level, Output, Speed, AnyPin};
+use embassy_stm32::low_power::Executor;
+use embassy_stm32::rtc::{Rtc, RtcConfig};
+use embassy_stm32::Config;
+use embassy_stm32::rcc::LsConfig;
+use embassy_time::Timer;
+use static_cell::StaticCell;
+use {defmt_rtt as _, panic_probe as _};
+
+#[cortex_m_rt::entry]
+fn main() -> ! {
+    Executor::take().run(|spawner| {
+        unwrap!(spawner.spawn(async_main(spawner)));
+    })
+}
+
+#[embassy_executor::task]
+async fn async_main(spawner: Spawner) {
+    let mut config = Config::default();
+    config.rcc.ls = LsConfig::default_lsi();
+    // when enabled the power-consumption is much higher during stop, but debugging and RTT is working
+    // if you wan't to measure the power-consumption, or for production: uncomment this line
+    // config.enable_debug_during_sleep = false;
+    let p = embassy_stm32::init(config);
+
+    // give the RTC to the executor...
+    let rtc = Rtc::new(p.RTC, RtcConfig::default());
+    static RTC: StaticCell<Rtc> = StaticCell::new();
+    let rtc = RTC.init(rtc);
+    embassy_stm32::low_power::stop_with_rtc(rtc);
+
+    unwrap!(spawner.spawn(blinky(p.PC7.into())));
+    unwrap!(spawner.spawn(timeout()));
+}
+
+#[embassy_executor::task]
+async fn blinky(led: AnyPin) -> ! {
+    let mut led = Output::new(led, Level::Low, Speed::Low);
+    loop {
+        info!("high");
+        led.set_high();
+        Timer::after_millis(300).await;
+
+        info!("low");
+        led.set_low();
+        Timer::after_millis(300).await;
+    }
+}
+
+// when enable_debug_during_sleep is false, it is more difficult to reprogram the MCU
+// therefore we block the MCU after 30s to be able to reprogram it easily
+#[embassy_executor::task]
+async fn timeout() -> ! {
+    Timer::after_secs(30).await;
+    loop {}
+}