stm32l5: add low-power stop example

2 files changed, 66 insertions, 1 deletions

diff --git a/examples/stm32l5/Cargo.toml b/examples/stm32l5/Cargo.toml
index 329e7b98d..c50314587 100644
--- a/examples/stm32l5/Cargo.toml
+++ b/examples/stm32l5/Cargo.toml
@@ -6,7 +6,7 @@ license = "MIT OR Apache-2.0"
 
 [dependencies]
 # Change stm32l552ze to your chip name, if necessary.
-embassy-stm32 = { version = "0.1.0", path = "../../embassy-stm32", features = [ "defmt", "unstable-pac", "stm32l552ze", "time-driver-any", "exti", "memory-x"]  }
+embassy-stm32 = { version = "0.1.0", path = "../../embassy-stm32", features = [ "defmt", "unstable-pac", "stm32l552ze", "time-driver-any", "exti", "memory-x", "low-power"]  }
 embassy-sync = { version = "0.5.0", path = "../../embassy-sync", features = ["defmt"] }
 embassy-executor = { version = "0.4.0", path = "../../embassy-executor", features = ["task-arena-size-32768", "arch-cortex-m", "executor-thread", "defmt", "integrated-timers"] }
 embassy-time = { version = "0.2", path = "../../embassy-time", features = ["defmt", "defmt-timestamp-uptime", "tick-hz-32_768"] }
@@ -30,3 +30,7 @@ static_cell = "2"
 
 [profile.release]
 debug = 2
+
+[[bin]]
+name = "stop"
+default-features = ["embassy-stm32/low-power"]
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 {}
+}