From f721a46b2ddefb491b72ebffc883fe9b1c7eefdc Mon Sep 17 00:00:00 2001
From: Jana Lemke <dev@jana-lemke.de>
Date: Sat, 29 Mar 2025 17:49:32 +0100
Subject: [PATCH] Initialize with embassy examples

---
 .cargo/config.toml       |   7 +
 .gitignore               |   1 +
 Cargo.lock               | 980 +++++++++++++++++++++++++++++++++++++++
 Cargo.toml               |  31 ++
 build.rs                 |   5 +
 rust-toolchain.toml      |   4 +
 src/bin/adc.rs           |  39 ++
 src/bin/blinky.rs        |  26 ++
 src/bin/can.rs           | 140 ++++++
 src/bin/hello.rs         |  19 +
 src/bin/input_capture.rs |  52 +++
 src/bin/pwm_input.rs     |  54 +++
 src/bin/usb_serial.rs    | 121 +++++
 13 files changed, 1479 insertions(+)
 create mode 100644 .cargo/config.toml
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 build.rs
 create mode 100644 rust-toolchain.toml
 create mode 100644 src/bin/adc.rs
 create mode 100644 src/bin/blinky.rs
 create mode 100644 src/bin/can.rs
 create mode 100644 src/bin/hello.rs
 create mode 100644 src/bin/input_capture.rs
 create mode 100644 src/bin/pwm_input.rs
 create mode 100644 src/bin/usb_serial.rs

diff --git a/.cargo/config.toml b/.cargo/config.toml
new file mode 100644
index 0000000..796380a
--- /dev/null
+++ b/.cargo/config.toml
@@ -0,0 +1,7 @@
+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+# replace STM32F103C8 with your chip as listed in `probe-rs chip list`
+runner = "probe-rs run --chip STM32F103C8"
+[build]
+target = "thumbv7m-none-eabi"
+[env]
+DEFMT_LOG = "trace"
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..eb5a316
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..d96da67
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,980 @@
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+# It is not intended for manual editing.
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+ "proc-macro2",
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+ "vcell",
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+checksum = "1b9b4fd18abc82b8136838da5d50bae7bdea537c574d8dc1a34ed098d6c166f0"
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+ "zerocopy-derive",
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+[[package]]
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..25f349a
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,31 @@
+[package]
+edition = "2024"
+name = "buzzer-firmware"
+version = "0.1.0"
+license = "MIT OR Apache-2.0"
+
+[dependencies]
+# Change stm32f103c8 to your chip name, if necessary.
+embassy-stm32 = { version = "0.2.0",  features = [ "defmt", "stm32f103c8", "unstable-pac", "memory-x", "time-driver-any" ]  }
+embassy-sync = { version = "0.6.2",  features = ["defmt"] }
+embassy-executor = { version = "0.7.0",  features = ["arch-cortex-m", "executor-thread", "defmt"] }
+embassy-time = { version = "0.4.0",  features = ["defmt", "defmt-timestamp-uptime", "tick-hz-32_768"] }
+embassy-usb = { version = "0.4.0",  features = ["defmt"] }
+embassy-futures = { version = "0.1.0"}
+
+defmt = "0.3"
+defmt-rtt = "0.4"
+
+cortex-m = { version = "0.7.6", features = ["inline-asm", "critical-section-single-core"] }
+cortex-m-rt = "0.7.0"
+embedded-hal = "0.2.6"
+panic-probe = { version = "0.3", features = ["print-defmt"] }
+heapless = { version = "0.8", default-features = false }
+nb = "1.0.0"
+static_cell = "2.0.0"
+
+[profile.dev]
+opt-level = "s"
+
+[profile.release]
+debug = 2
diff --git a/build.rs b/build.rs
new file mode 100644
index 0000000..8cd32d7
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,5 @@
+fn main() {
+    println!("cargo:rustc-link-arg-bins=--nmagic");
+    println!("cargo:rustc-link-arg-bins=-Tlink.x");
+    println!("cargo:rustc-link-arg-bins=-Tdefmt.x");
+}
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..3ec9b86
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,4 @@
+[toolchain]
+channel = "1.85"
+components = [ "rust-src", "rustfmt", "llvm-tools", "miri" ]
+targets = ["thumbv7m-none-eabi"]
diff --git a/src/bin/adc.rs b/src/bin/adc.rs
new file mode 100644
index 0000000..541ff15
--- /dev/null
+++ b/src/bin/adc.rs
@@ -0,0 +1,39 @@
+#![no_std]
+#![no_main]
+
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_stm32::adc::Adc;
+use embassy_stm32::peripherals::ADC1;
+use embassy_stm32::{adc, bind_interrupts};
+use embassy_time::Timer;
+use {defmt_rtt as _, panic_probe as _};
+
+bind_interrupts!(struct Irqs {
+    ADC1_2 => adc::InterruptHandler<ADC1>;
+});
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let p = embassy_stm32::init(Default::default());
+    info!("Hello World!");
+
+    let mut adc = Adc::new(p.ADC1);
+    let mut pin = p.PB1;
+
+    let mut vrefint = adc.enable_vref();
+    let vrefint_sample = adc.read(&mut vrefint).await;
+    let convert_to_millivolts = |sample| {
+        // From http://www.st.com/resource/en/datasheet/CD00161566.pdf
+        // 5.3.4 Embedded reference voltage
+        const VREFINT_MV: u32 = 1200; // mV
+
+        (u32::from(sample) * VREFINT_MV / u32::from(vrefint_sample)) as u16
+    };
+
+    loop {
+        let v = adc.read(&mut pin).await;
+        info!("--> {} - {} mV", v, convert_to_millivolts(v));
+        Timer::after_millis(100).await;
+    }
+}
diff --git a/src/bin/blinky.rs b/src/bin/blinky.rs
new file mode 100644
index 0000000..cc43f85
--- /dev/null
+++ b/src/bin/blinky.rs
@@ -0,0 +1,26 @@
+#![no_std]
+#![no_main]
+
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_stm32::gpio::{Level, Output, Speed};
+use embassy_time::Timer;
+use {defmt_rtt as _, panic_probe as _};
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let p = embassy_stm32::init(Default::default());
+    info!("Hello World!");
+
+    let mut led = Output::new(p.PC13, Level::High, Speed::Low);
+
+    loop {
+        info!("high");
+        led.set_high();
+        Timer::after_millis(300).await;
+
+        info!("low");
+        led.set_low();
+        Timer::after_millis(300).await;
+    }
+}
diff --git a/src/bin/can.rs b/src/bin/can.rs
new file mode 100644
index 0000000..ad0c8a5
--- /dev/null
+++ b/src/bin/can.rs
@@ -0,0 +1,140 @@
+#![no_std]
+#![no_main]
+
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_stm32::can::frame::Envelope;
+use embassy_stm32::can::{
+    filter, Can, Fifo, Frame, Id, Rx0InterruptHandler, Rx1InterruptHandler, SceInterruptHandler, StandardId,
+    TxInterruptHandler,
+};
+use embassy_stm32::peripherals::CAN;
+use embassy_stm32::{bind_interrupts, Config};
+use static_cell::StaticCell;
+use {defmt_rtt as _, panic_probe as _};
+
+bind_interrupts!(struct Irqs {
+    USB_LP_CAN1_RX0 => Rx0InterruptHandler<CAN>;
+    CAN1_RX1 => Rx1InterruptHandler<CAN>;
+    CAN1_SCE => SceInterruptHandler<CAN>;
+    USB_HP_CAN1_TX => TxInterruptHandler<CAN>;
+});
+
+// This example is configured to work with real CAN transceivers on B8/B9.
+// See other examples for loopback.
+
+fn handle_frame(env: Envelope, read_mode: &str) {
+    match env.frame.id() {
+        Id::Extended(id) => {
+            defmt::println!(
+                "{} Extended Frame id={:x} {:02x}",
+                read_mode,
+                id.as_raw(),
+                env.frame.data()
+            );
+        }
+        Id::Standard(id) => {
+            defmt::println!(
+                "{} Standard Frame id={:x} {:02x}",
+                read_mode,
+                id.as_raw(),
+                env.frame.data()
+            );
+        }
+    }
+}
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let p = embassy_stm32::init(Config::default());
+
+    // Set alternate pin mapping to B8/B9
+    embassy_stm32::pac::AFIO.mapr().modify(|w| w.set_can1_remap(2));
+
+    static RX_BUF: StaticCell<embassy_stm32::can::RxBuf<10>> = StaticCell::new();
+    static TX_BUF: StaticCell<embassy_stm32::can::TxBuf<10>> = StaticCell::new();
+
+    let mut can = Can::new(p.CAN, p.PB8, p.PB9, Irqs);
+
+    can.modify_filters()
+        .enable_bank(0, Fifo::Fifo0, filter::Mask32::accept_all());
+
+    can.modify_config()
+        .set_loopback(false)
+        .set_silent(false)
+        .set_bitrate(250_000);
+
+    can.enable().await;
+    let mut i: u8 = 0;
+
+    /*
+       // Example for using buffered Tx and Rx without needing to
+       // split first as is done below.
+       let mut can = can.buffered(
+           TX_BUF.init(embassy_stm32::can::TxBuf::<10>::new()),
+           RX_BUF.init(embassy_stm32::can::RxBuf::<10>::new()));
+       loop {
+           let tx_frame = Frame::new_data(unwrap!(StandardId::new(i as _)), &[i, 0, 1, 2, 3, 4, 5, 6]).unwrap();
+           can.write(&tx_frame).await;
+
+           match can.read().await {
+               Ok((frame, ts)) => {
+                   handle_frame(Envelope { ts, frame }, "Buf");
+               }
+               Err(err) => {
+                   defmt::println!("Error {}", err);
+               }
+           }
+           i = i.wrapping_add(1);
+       }
+
+    */
+    let (mut tx, mut rx) = can.split();
+
+    // This example shows using the wait_not_empty API before try read
+    while i < 3 {
+        let tx_frame = Frame::new_data(unwrap!(StandardId::new(i as _)), &[i, 0, 1, 2, 3, 4, 5, 6]).unwrap();
+        tx.write(&tx_frame).await;
+
+        rx.wait_not_empty().await;
+        let env = rx.try_read().unwrap();
+        handle_frame(env, "Wait");
+        i += 1;
+    }
+
+    // This example shows using the full async non-buffered API
+    while i < 6 {
+        let tx_frame = Frame::new_data(unwrap!(StandardId::new(i as _)), &[i, 0, 1, 2, 3, 4, 5, 6]).unwrap();
+        tx.write(&tx_frame).await;
+
+        match rx.read().await {
+            Ok(env) => {
+                handle_frame(env, "NoBuf");
+            }
+            Err(err) => {
+                defmt::println!("Error {}", err);
+            }
+        }
+        i += 1;
+    }
+
+    // This example shows using buffered RX and TX. User passes in desired buffer (size)
+    // It's possible this way to have just RX or TX buffered.
+    let mut rx = rx.buffered(RX_BUF.init(embassy_stm32::can::RxBuf::<10>::new()));
+    let mut tx = tx.buffered(TX_BUF.init(embassy_stm32::can::TxBuf::<10>::new()));
+
+    loop {
+        let tx_frame = Frame::new_data(unwrap!(StandardId::new(i as _)), &[i, 0, 1, 2, 3, 4, 5, 6]).unwrap();
+        tx.write(&tx_frame).await;
+
+        match rx.read().await {
+            Ok(envelope) => {
+                handle_frame(envelope, "Buf");
+            }
+            Err(err) => {
+                defmt::println!("Error {}", err);
+            }
+        }
+        i = i.wrapping_add(1);
+    }
+}
diff --git a/src/bin/hello.rs b/src/bin/hello.rs
new file mode 100644
index 0000000..3c29561
--- /dev/null
+++ b/src/bin/hello.rs
@@ -0,0 +1,19 @@
+#![no_std]
+#![no_main]
+
+use defmt::info;
+use embassy_executor::Spawner;
+use embassy_stm32::Config;
+use embassy_time::Timer;
+use {defmt_rtt as _, panic_probe as _};
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) -> ! {
+    let config = Config::default();
+    let _p = embassy_stm32::init(config);
+
+    loop {
+        info!("Hello World!");
+        Timer::after_secs(1).await;
+    }
+}
diff --git a/src/bin/input_capture.rs b/src/bin/input_capture.rs
new file mode 100644
index 0000000..6fe8e0b
--- /dev/null
+++ b/src/bin/input_capture.rs
@@ -0,0 +1,52 @@
+#![no_std]
+#![no_main]
+
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_stm32::gpio::{Level, Output, Pull, Speed};
+use embassy_stm32::time::khz;
+use embassy_stm32::timer::input_capture::{CapturePin, InputCapture};
+use embassy_stm32::timer::{self, Channel};
+use embassy_stm32::{bind_interrupts, peripherals, Peri};
+use embassy_time::Timer;
+use {defmt_rtt as _, panic_probe as _};
+
+/// Connect PA2 and PC13 with a 1k Ohm resistor
+
+#[embassy_executor::task]
+async fn blinky(led: Peri<'static, peripherals::PC13>) {
+    let mut led = Output::new(led, Level::High, Speed::Low);
+
+    loop {
+        info!("high");
+        led.set_high();
+        Timer::after_millis(300).await;
+
+        info!("low");
+        led.set_low();
+        Timer::after_millis(300).await;
+    }
+}
+
+bind_interrupts!(struct Irqs {
+    TIM2 => timer::CaptureCompareInterruptHandler<peripherals::TIM2>;
+});
+
+#[embassy_executor::main]
+async fn main(spawner: Spawner) {
+    let p = embassy_stm32::init(Default::default());
+    info!("Hello World!");
+
+    unwrap!(spawner.spawn(blinky(p.PC13)));
+
+    let ch3 = CapturePin::new_ch3(p.PA2, Pull::None);
+    let mut ic = InputCapture::new(p.TIM2, None, None, Some(ch3), None, Irqs, khz(1000), Default::default());
+
+    loop {
+        info!("wait for rising edge");
+        ic.wait_for_rising_edge(Channel::Ch3).await;
+
+        let capture_value = ic.get_capture_value(Channel::Ch3);
+        info!("new capture! {}", capture_value);
+    }
+}
diff --git a/src/bin/pwm_input.rs b/src/bin/pwm_input.rs
new file mode 100644
index 0000000..afbef3e
--- /dev/null
+++ b/src/bin/pwm_input.rs
@@ -0,0 +1,54 @@
+#![no_std]
+#![no_main]
+
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_stm32::gpio::{Level, Output, Pull, Speed};
+use embassy_stm32::time::khz;
+use embassy_stm32::timer::pwm_input::PwmInput;
+use embassy_stm32::{bind_interrupts, peripherals, timer, Peri};
+use embassy_time::Timer;
+use {defmt_rtt as _, panic_probe as _};
+
+/// Connect PA0 and PC13 with a 1k Ohm resistor
+
+#[embassy_executor::task]
+async fn blinky(led: Peri<'static, peripherals::PC13>) {
+    let mut led = Output::new(led, Level::High, Speed::Low);
+
+    loop {
+        info!("high");
+        led.set_high();
+        Timer::after_millis(300).await;
+
+        info!("low");
+        led.set_low();
+        Timer::after_millis(300).await;
+    }
+}
+
+bind_interrupts!(struct Irqs {
+    TIM2 => timer::CaptureCompareInterruptHandler<peripherals::TIM2>;
+});
+
+#[embassy_executor::main]
+async fn main(spawner: Spawner) {
+    let p = embassy_stm32::init(Default::default());
+    info!("Hello World!");
+
+    unwrap!(spawner.spawn(blinky(p.PC13)));
+
+    let mut pwm_input = PwmInput::new(p.TIM2, p.PA0, Pull::None, khz(10));
+    pwm_input.enable();
+
+    loop {
+        Timer::after_millis(500).await;
+        let period = pwm_input.get_period_ticks();
+        let width = pwm_input.get_width_ticks();
+        let duty_cycle = pwm_input.get_duty_cycle();
+        info!(
+            "period ticks: {} width ticks: {} duty cycle: {}",
+            period, width, duty_cycle
+        );
+    }
+}
diff --git a/src/bin/usb_serial.rs b/src/bin/usb_serial.rs
new file mode 100644
index 0000000..77ec307
--- /dev/null
+++ b/src/bin/usb_serial.rs
@@ -0,0 +1,121 @@
+#![no_std]
+#![no_main]
+
+use defmt::{panic, *};
+use embassy_executor::Spawner;
+use embassy_futures::join::join;
+use embassy_stm32::gpio::{Level, Output, Speed};
+use embassy_stm32::time::Hertz;
+use embassy_stm32::usb::{Driver, Instance};
+use embassy_stm32::{bind_interrupts, peripherals, usb, Config};
+use embassy_time::Timer;
+use embassy_usb::class::cdc_acm::{CdcAcmClass, State};
+use embassy_usb::driver::EndpointError;
+use embassy_usb::Builder;
+use {defmt_rtt as _, panic_probe as _};
+
+bind_interrupts!(struct Irqs {
+    USB_LP_CAN1_RX0 => usb::InterruptHandler<peripherals::USB>;
+});
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let mut config = Config::default();
+    {
+        use embassy_stm32::rcc::*;
+        config.rcc.hse = Some(Hse {
+            freq: Hertz(8_000_000),
+            // Oscillator for bluepill, Bypass for nucleos.
+            mode: HseMode::Oscillator,
+        });
+        config.rcc.pll = Some(Pll {
+            src: PllSource::HSE,
+            prediv: PllPreDiv::DIV1,
+            mul: PllMul::MUL9,
+        });
+        config.rcc.sys = Sysclk::PLL1_P;
+        config.rcc.ahb_pre = AHBPrescaler::DIV1;
+        config.rcc.apb1_pre = APBPrescaler::DIV2;
+        config.rcc.apb2_pre = APBPrescaler::DIV1;
+    }
+    let mut p = embassy_stm32::init(config);
+
+    info!("Hello World!");
+
+    {
+        // BluePill board has a pull-up resistor on the D+ line.
+        // Pull the D+ pin down to send a RESET condition to the USB bus.
+        // This forced reset is needed only for development, without it host
+        // will not reset your device when you upload new firmware.
+        let _dp = Output::new(p.PA12.reborrow(), Level::Low, Speed::Low);
+        Timer::after_millis(10).await;
+    }
+
+    // Create the driver, from the HAL.
+    let driver = Driver::new(p.USB, Irqs, p.PA12, p.PA11);
+
+    // Create embassy-usb Config
+    let config = embassy_usb::Config::new(0xc0de, 0xcafe);
+    //config.max_packet_size_0 = 64;
+
+    // Create embassy-usb DeviceBuilder using the driver and config.
+    // It needs some buffers for building the descriptors.
+    let mut config_descriptor = [0; 256];
+    let mut bos_descriptor = [0; 256];
+    let mut control_buf = [0; 7];
+
+    let mut state = State::new();
+
+    let mut builder = Builder::new(
+        driver,
+        config,
+        &mut config_descriptor,
+        &mut bos_descriptor,
+        &mut [], // no msos descriptors
+        &mut control_buf,
+    );
+
+    // Create classes on the builder.
+    let mut class = CdcAcmClass::new(&mut builder, &mut state, 64);
+
+    // Build the builder.
+    let mut usb = builder.build();
+
+    // Run the USB device.
+    let usb_fut = usb.run();
+
+    // Do stuff with the class!
+    let echo_fut = async {
+        loop {
+            class.wait_connection().await;
+            info!("Connected");
+            let _ = echo(&mut class).await;
+            info!("Disconnected");
+        }
+    };
+
+    // Run everything concurrently.
+    // If we had made everything `'static` above instead, we could do this using separate tasks instead.
+    join(usb_fut, echo_fut).await;
+}
+
+struct Disconnected {}
+
+impl From<EndpointError> for Disconnected {
+    fn from(val: EndpointError) -> Self {
+        match val {
+            EndpointError::BufferOverflow => panic!("Buffer overflow"),
+            EndpointError::Disabled => Disconnected {},
+        }
+    }
+}
+
+async fn echo<'d, T: Instance + 'd>(class: &mut CdcAcmClass<'d, Driver<'d, T>>) -> Result<(), Disconnected> {
+    let mut buf = [0; 64];
+    loop {
+        let n = class.read_packet(&mut buf).await?;
+        let data = &buf[..n];
+        info!("data: {:x}", data);
+        class.write_packet(data).await?;
+    }
+}