Merge #437

437: Initial support for STM32F767ZI. r=Dirbaio a=matoushybl

This PR adds support for the STM32F767ZI, it adds examples and RCC setup.
It is greatly based on the F4 source code and the f7-hal.

This PR is based on the pending PR in stm32-data: https://github.com/embassy-rs/stm32-data/pull/92

I am looking forward to your feedback on improving it and adding support for more peripherals and devices in the F7 family.

Co-authored-by: Matous Hybl <[email protected]>
Co-authored-by: Dario Nieuwenhuis <[email protected]>

9 files changed, 240 insertions, 0 deletions

diff --git a/examples/stm32f7/.cargo/config.toml b/examples/stm32f7/.cargo/config.toml
new file mode 100644
index 000000000..632e81541
--- /dev/null
+++ b/examples/stm32f7/.cargo/config.toml
@@ -0,0 +1,18 @@
+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+# replace STM32F429ZITx with your chip as listed in `probe-run --list-chips`
+runner = "probe-run --chip STM32F767ZITx"
+
+rustflags = [
+  # LLD (shipped with the Rust toolchain) is used as the default linker
+  "-C", "link-arg=--nmagic",
+  "-C", "link-arg=-Tlink.x",
+  "-C", "link-arg=-Tdefmt.x",
+
+  # Code-size optimizations.
+  "-Z", "trap-unreachable=no",
+  "-C", "inline-threshold=5",
+  "-C", "no-vectorize-loops",
+]
+
+[build]
+target = "thumbv7em-none-eabihf"
diff --git a/examples/stm32f7/Cargo.toml b/examples/stm32f7/Cargo.toml
new file mode 100644
index 000000000..cda2d7778
--- /dev/null
+++ b/examples/stm32f7/Cargo.toml
@@ -0,0 +1,35 @@
+[package]
+authors = ["Dario Nieuwenhuis <[email protected]>"]
+edition = "2018"
+name = "embassy-stm32f7-examples"
+version = "0.1.0"
+resolver = "2"
+
+[features]
+default = [
+    "defmt-default",
+]
+defmt-default = []
+defmt-trace = []
+defmt-debug = []
+defmt-info = []
+defmt-warn = []
+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", "stm32f767zi", "unstable-pac", "time-driver-tim2"]  }
+embassy-hal-common = {version = "0.1.0", path = "../../embassy-hal-common" }
+
+defmt = "0.2.3"
+defmt-rtt = "0.2.0"
+
+cortex-m = "0.7.3"
+cortex-m-rt = "0.7.0"
+embedded-hal = "0.2.6"
+panic-probe = { version = "0.2.0", features = ["print-defmt"] }
+futures = { version = "0.3.17", default-features = false, features = ["async-await"] }
+rtt-target = { version = "0.3.1", features = ["cortex-m"] }
+heapless = { version = "0.7.5", default-features = false }
+nb = "1.0.0"
diff --git a/examples/stm32f7/build.rs b/examples/stm32f7/build.rs
new file mode 100644
index 000000000..b81f6b6e1
--- /dev/null
+++ b/examples/stm32f7/build.rs
@@ -0,0 +1,39 @@
+//! adapted from https://github.com/stm32-rs/stm32f7xx-hal/blob/master/build.rs
+use std::env;
+use std::fs::File;
+use std::io::{self, prelude::*};
+use std::path::PathBuf;
+
+#[derive(Debug)]
+enum Error {
+    Env(env::VarError),
+    Io(io::Error),
+}
+
+impl From<env::VarError> for Error {
+    fn from(error: env::VarError) -> Self {
+        Self::Env(error)
+    }
+}
+
+impl From<io::Error> for Error {
+    fn from(error: io::Error) -> Self {
+        Self::Io(error)
+    }
+}
+
+fn main() -> Result<(), Error> {
+    println!("cargo:rerun-if-changed=build.rs");
+    println!("cargo:rerun-if-changed=memory.x");
+
+    let out_dir = env::var("OUT_DIR")?;
+    let out_dir = PathBuf::from(out_dir);
+
+    let memory_x = include_bytes!("memory.x").as_ref();
+    File::create(out_dir.join("memory.x"))?.write_all(memory_x)?;
+
+    // Tell Cargo where to find the file.
+    println!("cargo:rustc-link-search={}", out_dir.display());
+
+    Ok(())
+}
diff --git a/examples/stm32f7/memory.x b/examples/stm32f7/memory.x
new file mode 100644
index 000000000..899f7a4b8
--- /dev/null
+++ b/examples/stm32f7/memory.x
@@ -0,0 +1,12 @@
+/* For STM32F765,767,768,769,777,778,779 devices */
+MEMORY
+{
+  /* NOTE K = KiBi = 1024 bytes */
+  FLASH : ORIGIN = 0x08000000, LENGTH = 2M
+  RAM : ORIGIN = 0x20000000, LENGTH = 368K + 16K
+}
+
+/* This is where the call stack will be allocated. */
+/* The stack is of the full descending type. */
+/* NOTE Do NOT modify `_stack_start` unless you know what you are doing */
+_stack_start = ORIGIN(RAM) + LENGTH(RAM);
diff --git a/examples/stm32f7/src/bin/blinky.rs b/examples/stm32f7/src/bin/blinky.rs
new file mode 100644
index 000000000..c4857195f
--- /dev/null
+++ b/examples/stm32f7/src/bin/blinky.rs
@@ -0,0 +1,29 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+use embassy::executor::Spawner;
+use embassy::time::{Duration, Timer};
+use embassy_stm32::gpio::{Level, Output, Speed};
+use embassy_stm32::Peripherals;
+use embedded_hal::digital::v2::OutputPin;
+use example_common::*;
+
+#[embassy::main]
+async fn main(_spawner: Spawner, p: Peripherals) {
+    info!("Hello World!");
+
+    let mut led = Output::new(p.PB7, Level::High, Speed::Low);
+
+    loop {
+        info!("high");
+        unwrap!(led.set_high());
+        Timer::after(Duration::from_millis(300)).await;
+
+        info!("low");
+        unwrap!(led.set_low());
+        Timer::after(Duration::from_millis(300)).await;
+    }
+}
diff --git a/examples/stm32f7/src/bin/button.rs b/examples/stm32f7/src/bin/button.rs
new file mode 100644
index 000000000..95dee7c74
--- /dev/null
+++ b/examples/stm32f7/src/bin/button.rs
@@ -0,0 +1,34 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+use cortex_m_rt::entry;
+use embassy_stm32::gpio::{Input, Level, Output, Pull, Speed};
+use embedded_hal::digital::v2::{InputPin, OutputPin};
+use example_common::*;
+
+#[entry]
+fn main() -> ! {
+    info!("Hello World!");
+
+    let p = embassy_stm32::init(Default::default());
+
+    let button = Input::new(p.PC13, Pull::Down);
+    let mut led1 = Output::new(p.PB0, Level::High, Speed::Low);
+    let _led2 = Output::new(p.PB7, Level::High, Speed::Low);
+    let mut led3 = Output::new(p.PB14, Level::High, Speed::Low);
+
+    loop {
+        if unwrap!(button.is_high()) {
+            info!("high");
+            unwrap!(led1.set_high());
+            unwrap!(led3.set_low());
+        } else {
+            info!("low");
+            unwrap!(led1.set_low());
+            unwrap!(led3.set_high());
+        }
+    }
+}
diff --git a/examples/stm32f7/src/bin/button_exti.rs b/examples/stm32f7/src/bin/button_exti.rs
new file mode 100644
index 000000000..2c4318d64
--- /dev/null
+++ b/examples/stm32f7/src/bin/button_exti.rs
@@ -0,0 +1,29 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+use embassy::executor::Spawner;
+use embassy_stm32::exti::ExtiInput;
+use embassy_stm32::gpio::{Input, Pull};
+use embassy_stm32::Peripherals;
+use embassy_traits::gpio::{WaitForFallingEdge, WaitForRisingEdge};
+use example_common::*;
+
+#[embassy::main]
+async fn main(_spawner: Spawner, p: Peripherals) {
+    info!("Hello World!");
+
+    let button = Input::new(p.PC13, Pull::Down);
+    let mut button = ExtiInput::new(button, p.EXTI13);
+
+    info!("Press the USER button...");
+
+    loop {
+        button.wait_for_rising_edge().await;
+        info!("Pressed!");
+        button.wait_for_falling_edge().await;
+        info!("Released!");
+    }
+}
diff --git a/examples/stm32f7/src/bin/hello.rs b/examples/stm32f7/src/bin/hello.rs
new file mode 100644
index 000000000..56eb67bf3
--- /dev/null
+++ b/examples/stm32f7/src/bin/hello.rs
@@ -0,0 +1,27 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use defmt::info;
+use embassy::executor::Spawner;
+use embassy::time::{Duration, Timer};
+use embassy_stm32::time::Hertz;
+use embassy_stm32::Config;
+use embassy_stm32::Peripherals;
+
+#[path = "../example_common.rs"]
+mod example_common;
+
+fn config() -> Config {
+    let mut config = Config::default();
+    config.rcc.sys_ck = Some(Hertz(84_000_000));
+    config
+}
+
+#[embassy::main(config = "config()")]
+async fn main(_spawner: Spawner, _p: Peripherals) -> ! {
+    loop {
+        info!("Hello World!");
+        Timer::after(Duration::from_secs(1)).await;
+    }
+}
diff --git a/examples/stm32f7/src/example_common.rs b/examples/stm32f7/src/example_common.rs
new file mode 100644
index 000000000..54d633837
--- /dev/null
+++ b/examples/stm32f7/src/example_common.rs
@@ -0,0 +1,17 @@
+#![macro_use]
+
+use defmt_rtt as _; // global logger
+use panic_probe as _;
+
+pub use defmt::*;
+
+use core::sync::atomic::{AtomicUsize, Ordering};
+
+defmt::timestamp! {"{=u64}", {
+        static COUNT: AtomicUsize = AtomicUsize::new(0);
+        // NOTE(no-CAS) `timestamps` runs with interrupts disabled
+        let n = COUNT.load(Ordering::Relaxed);
+        COUNT.store(n + 1, Ordering::Relaxed);
+        n as u64
+    }
+}