stm32/time: add Cargo features to choose tim2/tim3

embassy-stm32/Cargo.toml

@@ -6,7 +6,7 @@ edition = "2018"
 resolver = "2"
 
 [dependencies]
-embassy = { version = "0.1.0", path = "../embassy", features = ["time-tick-32768hz"] }
+embassy = { version = "0.1.0", path = "../embassy" }
 embassy-macros = { version = "0.1.0", path = "../embassy-macros", features = ["stm32"] }
 embassy-hal-common = {version = "0.1.0", path = "../embassy-hal-common" }
 embassy-traits = {version = "0.1.0", path = "../embassy-traits" }
@@ -44,6 +44,12 @@ sdmmc-rs = ["embedded-sdmmc"]
 net = ["embassy-net", "vcell"]
 memory-x = ["stm32-metapac/memory-x"]
 
+# Features starting with `_` are for internal use only. They're not intended
+# to be enabled by other crates, and are not covered by semver guarantees.
+_time-driver = ["embassy/time-tick-32768hz"]
+time-driver-tim2 = ["_time-driver"]
+time-driver-tim3 = ["_time-driver"]
+
 # Reexport stm32-metapac at `embassy_stm32::pac`.
 # This is unstable because semver-minor (non-breaking) releases of embassy-stm32 may major-bump (breaking) the stm32-metapac version.
 # If this is an issue for you, you're encouraged to directly depend on a fixed version of the PAC.

embassy-stm32/src/lib.rs

@@ -20,6 +20,7 @@ pub mod time;
 pub mod dma;
 pub mod gpio;
 pub mod rcc;
+#[cfg(feature = "_time-driver")]
 mod time_driver;
 
 // Sometimes-present hardware
@@ -88,6 +89,7 @@ pub fn init(config: Config) -> Peripherals {
         rcc::init(config.rcc);
 
         // must be after rcc init
+        #[cfg(feature = "_time-driver")]
         time_driver::init();
     }
 

embassy-stm32/src/time_driver.rs

@@ -17,8 +17,23 @@ use crate::rcc::sealed::RccPeripheral;
 use self::sealed::Instance as _;
 
 const ALARM_COUNT: usize = 3;
+
+#[cfg(feature = "time-driver-tim2")]
+type T = peripherals::TIM2;
+#[cfg(feature = "time-driver-tim3")]
 type T = peripherals::TIM3;
 
+#[cfg(feature = "time-driver-tim2")]
+#[interrupt]
+fn TIM2() {
+    STATE.on_interrupt()
+}
+#[cfg(feature = "time-driver-tim3")]
+#[interrupt]
+fn TIM3() {
+    STATE.on_interrupt()
+}
+
 // Clock timekeeping works with something we call "periods", which are time intervals
 // of 2^15 ticks. The Clock counter value is 16 bits, so one "overflow cycle" is 2 periods.
 //
@@ -275,11 +290,6 @@ impl Driver for RtcDriver {
     }
 }
 
-#[interrupt]
-fn TIM3() {
-    STATE.on_interrupt()
-}
-
 pub(crate) fn init() {
     STATE.init()
 }

examples/stm32f0/Cargo.toml

@@ -15,7 +15,7 @@ defmt-rtt = "0.2.0"
 panic-probe = { version = "0.2.0" }
 rtt-target = { version = "0.3", features = ["cortex-m"] }
 embassy = { path = "../../embassy", features = ["defmt"] }
-embassy-stm32 = { path = "../../embassy-stm32", features = ["defmt", "stm32f030f4"] }
+embassy-stm32 = { path = "../../embassy-stm32", features = ["defmt", "stm32f030f4", "time-driver-tim3"] }
 
 [features]
 default = [

examples/stm32f4/Cargo.toml

@@ -19,7 +19,7 @@ defmt-error = []
 [dependencies]
 embassy = { version = "0.1.0", path = "../../embassy", features = ["defmt", "defmt-trace"] }
 embassy-traits = { version = "0.1.0", path = "../../embassy-traits", features = ["defmt"] }
-embassy-stm32 = { version = "0.1.0", path = "../../embassy-stm32", features = ["defmt", "defmt-trace", "stm32f429zi", "unstable-pac", "memory-x"]  }
+embassy-stm32 = { version = "0.1.0", path = "../../embassy-stm32", features = ["defmt", "defmt-trace", "stm32f429zi", "unstable-pac", "memory-x", "time-driver-tim2"]  }
 embassy-hal-common = {version = "0.1.0", path = "../../embassy-hal-common" }
 
 defmt = "0.2.0"

examples/stm32h7/Cargo.toml

@@ -19,7 +19,7 @@ defmt-error = []
 [dependencies]
 embassy = { version = "0.1.0", path = "../../embassy", features = ["defmt", "defmt-trace"] }
 embassy-traits = { version = "0.1.0", path = "../../embassy-traits", features = ["defmt"] }
-embassy-stm32 = { version = "0.1.0", path = "../../embassy-stm32", features = ["defmt", "defmt-trace", "stm32h743zi", "net", "memory-x"] }
+embassy-stm32 = { version = "0.1.0", path = "../../embassy-stm32", features = ["defmt", "defmt-trace", "stm32h743zi", "net", "memory-x", "time-driver-tim2"] }
 embassy-hal-common = {version = "0.1.0", path = "../../embassy-hal-common" }
 embassy-net = { path = "../../embassy-net", default-features = false, features = ["defmt-debug", "defmt", "tcp", "medium-ethernet", "pool-16"] }
 stm32-metapac = { path = "../../stm32-metapac", features = ["stm32h743zi"] }

examples/stm32l0/Cargo.toml

@@ -19,7 +19,7 @@ defmt-error = []
 [dependencies]
 embassy = { version = "0.1.0", path = "../../embassy", features = ["defmt", "defmt-trace"] }
 embassy-traits = { version = "0.1.0", path = "../../embassy-traits", features = ["defmt"] }
-embassy-stm32 = { version = "0.1.0", path = "../../embassy-stm32", features = ["defmt", "defmt-trace", "stm32l072cz"]  }
+embassy-stm32 = { version = "0.1.0", path = "../../embassy-stm32", features = ["defmt", "defmt-trace", "stm32l072cz", "time-driver-tim3"]  }
 embassy-hal-common = {version = "0.1.0", path = "../../embassy-hal-common" }
 
 defmt = "0.2.0"

examples/stm32l4/Cargo.toml

@@ -19,7 +19,7 @@ defmt-error = []
 [dependencies]
 embassy = { version = "0.1.0", path = "../../embassy", features = ["defmt", "defmt-trace"] }
 embassy-traits = { version = "0.1.0", path = "../../embassy-traits", features = ["defmt"] }
-embassy-stm32 = { version = "0.1.0", path = "../../embassy-stm32", features = ["defmt", "defmt-trace", "unstable-pac", "stm32l4s5vi"]  }
+embassy-stm32 = { version = "0.1.0", path = "../../embassy-stm32", features = ["defmt", "defmt-trace", "unstable-pac", "stm32l4s5vi", "time-driver-tim2"]  }
 embassy-hal-common = {version = "0.1.0", path = "../../embassy-hal-common" }
 
 defmt = "0.2.0"

examples/stm32wb55/Cargo.toml

@@ -19,7 +19,7 @@ defmt-error = []
 [dependencies]
 embassy = { version = "0.1.0", path = "../../embassy", features = ["defmt", "defmt-trace"] }
 embassy-traits = { version = "0.1.0", path = "../../embassy-traits", features = ["defmt"] }
-embassy-stm32 = { version = "0.1.0", path = "../../embassy-stm32", features = ["defmt", "defmt-trace", "stm32wb55cc"]  }
+embassy-stm32 = { version = "0.1.0", path = "../../embassy-stm32", features = ["defmt", "defmt-trace", "stm32wb55cc", "time-driver-tim2"]  }
 embassy-hal-common = {version = "0.1.0", path = "../../embassy-hal-common" }
 
 defmt = "0.2.0"

examples/stm32wb55/src/bin/blinky.rs

@@ -6,27 +6,29 @@
 
 #[path = "../example_common.rs"]
 mod example_common;
+use embassy::executor::Spawner;
+use embassy::time::{Duration, Timer};
+use embassy_stm32::dbgmcu::Dbgmcu;
 use embassy_stm32::gpio::{Level, Output, Speed};
+use embassy_stm32::Peripherals;
 use embedded_hal::digital::v2::OutputPin;
 use example_common::*;
 
-use cortex_m_rt::entry;
+#[embassy::main]
-
+async fn main(_spawner: Spawner, p: Peripherals) {
-#[entry]
-fn main() -> ! {
     info!("Hello World!");
 
-    let p = embassy_stm32::init(Default::default());
+    unsafe { Dbgmcu::enable_all() };
 
     let mut led = Output::new(p.PB0, Level::High, Speed::Low);
 
     loop {
         info!("high");
         led.set_high().unwrap();
-        cortex_m::asm::delay(10_000_000);
+        Timer::after(Duration::from_millis(500)).await;
 
         info!("low");
         led.set_low().unwrap();
-        cortex_m::asm::delay(10_000_000);
+        Timer::after(Duration::from_millis(500)).await;
     }
 }