Start working on usb serial

embassy-stm32f4-examples/Cargo.toml

@@ -46,7 +46,8 @@ cortex-m = "0.7.1"
 cortex-m-rt = "0.6.13"
 embedded-hal    = { version = "0.2.4" }
 panic-probe = "0.1.0"
-stm32f4xx-hal  = { version = "0.8.3", features = ["rt"], git = "https://github.com/stm32-rs/stm32f4xx-hal.git"}
+stm32f4xx-hal  = { version = "0.8.3", features = ["rt", "usb_fs"], git = "https://github.com/stm32-rs/stm32f4xx-hal.git"}
 futures = { version = "0.3.8", default-features = false, features = ["async-await"] }
 rtt-target = { version = "0.3", features = ["cortex-m"] }
-bxcan = "0.5.0"
+bxcan = "0.5.0"
+usb-device = "0.2.7"

embassy-stm32f4-examples/src/bin/usb_serial.rs

@@ -0,0 +1,119 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+use example_common::*;
+
+use cortex_m_rt::entry;
+use defmt::panic;
+use embassy::executor::{task, Executor};
+use embassy::io::{AsyncBufReadExt, AsyncWriteExt};
+use embassy::time::{Duration, Timer};
+use embassy::util::Forever;
+use embassy_stm32f4::interrupt::OwnedInterrupt;
+use embassy_stm32f4::usb::Usb;
+use embassy_stm32f4::usb_serial::UsbSerial;
+use embassy_stm32f4::{interrupt, pac, rtc};
+use futures::future::{select, Either};
+use futures::pin_mut;
+use stm32f4xx_hal::otg_fs::{UsbBus, USB};
+use stm32f4xx_hal::prelude::*;
+use usb_device::bus::UsbBusAllocator;
+use usb_device::prelude::*;
+
+#[task]
+async fn run1(bus: &'static mut UsbBusAllocator<UsbBus<USB>>) {
+    info!("Async task");
+
+    let mut read_buf = [0u8; 128];
+    let mut write_buf = [0u8; 128];
+    let serial = UsbSerial::new(bus, &mut read_buf, &mut write_buf);
+
+    let device = UsbDeviceBuilder::new(bus, UsbVidPid(0x16c0, 0x27dd))
+        .manufacturer("Fake company")
+        .product("Serial port")
+        .serial_number("TEST")
+        .device_class(0x02)
+        .build();
+
+    let irq = interrupt::take!(OTG_FS);
+    irq.set_priority(interrupt::Priority::Level3);
+
+    let usb = Usb::new(device, serial, irq);
+    pin_mut!(usb);
+
+    let (mut read_interface, mut write_interface) = usb.as_mut().into_ref().take_serial();
+
+    let mut buf = [0u8; 5];
+    loop {
+        let recv_fut = read_interface.read(&mut buf);
+        let timeout = Timer::after(Duration::from_ticks(32768 * 3));
+
+        match select(recv_fut, timeout).await {
+            Either::Left((recv, _)) => {
+                let recv = unwrap!(recv);
+                unwrap!(write_interface.write_all(&buf[..recv]).await);
+            }
+            Either::Right(_) => {
+                unwrap!(write_interface.write_all(b"Hello\r\n").await);
+            }
+        }
+    }
+}
+
+static RTC: Forever<rtc::RTC<pac::TIM2>> = Forever::new();
+static ALARM: Forever<rtc::Alarm<pac::TIM2>> = Forever::new();
+static EXECUTOR: Forever<Executor> = Forever::new();
+static USB_BUS: Forever<UsbBusAllocator<UsbBus<USB>>> = Forever::new();
+
+#[entry]
+fn main() -> ! {
+    static mut EP_MEMORY: [u32; 1024] = [0; 1024];
+
+    info!("Hello World!");
+
+    let p = unwrap!(pac::Peripherals::take());
+
+    p.RCC.ahb1enr.modify(|_, w| w.dma1en().enabled());
+    let rcc = p.RCC.constrain();
+    let clocks = rcc
+        .cfgr
+        .use_hse(25.mhz())
+        .sysclk(48.mhz())
+        .require_pll48clk()
+        .freeze();
+
+    p.DBGMCU.cr.modify(|_, w| {
+        w.dbg_sleep().set_bit();
+        w.dbg_standby().set_bit();
+        w.dbg_stop().set_bit()
+    });
+
+    let rtc = RTC.put(rtc::RTC::new(p.TIM2, interrupt::take!(TIM2), clocks));
+    rtc.start();
+
+    unsafe { embassy::time::set_clock(rtc) };
+
+    let alarm = ALARM.put(rtc.alarm1());
+    let executor = EXECUTOR.put(Executor::new());
+    executor.set_alarm(alarm);
+
+    let gpioa = p.GPIOA.split();
+    let usb = USB {
+        usb_global: p.OTG_FS_GLOBAL,
+        usb_device: p.OTG_FS_DEVICE,
+        usb_pwrclk: p.OTG_FS_PWRCLK,
+        pin_dm: gpioa.pa11.into_alternate_af10(),
+        pin_dp: gpioa.pa12.into_alternate_af10(),
+        hclk: clocks.hclk(),
+    };
+    // Rust analyzer isn't recognizing the static ref magic `cortex-m` does
+    #[allow(unused_unsafe)]
+    let usb_bus = USB_BUS.put(UsbBus::new(usb, unsafe { EP_MEMORY }));
+
+    executor.run(move |spawner| {
+        unwrap!(spawner.spawn(run1(usb_bus)));
+    });
+}