Merge pull request #2158 from kalkyl/usb-bulk

rp: Add USB raw bulk example

examples/rp/src/bin/usb_raw_bulk.rs

@@ -0,0 +1,150 @@
+//! Example of using USB without a pre-defined class, but instead using raw USB bulk transfers.
+//!
+//! Example code to send/receive data using `nusb`:
+//!
+//! ```ignore
+//! use futures_lite::future::block_on;
+//! use nusb::transfer::RequestBuffer;
+//!
+//! const BULK_OUT_EP: u8 = 0x01;
+//! const BULK_IN_EP: u8 = 0x81;
+//!
+//! fn main() {
+//!     let di = nusb::list_devices()
+//!         .unwrap()
+//!         .find(|d| d.vendor_id() == 0xc0de && d.product_id() == 0xcafe)
+//!         .expect("no device found");
+//!     let device = di.open().expect("error opening device");
+//!     let interface = device.claim_interface(0).expect("error claiming interface");
+//!
+//!     let result = block_on(interface.bulk_out(BULK_OUT_EP, b"hello world".into()));
+//!     println!("{result:?}");
+//!     let result = block_on(interface.bulk_in(BULK_IN_EP, RequestBuffer::new(64)));
+//!     println!("{result:?}");
+//! }
+//! ```
+
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use defmt::info;
+use embassy_executor::Spawner;
+use embassy_futures::join::join;
+use embassy_rp::bind_interrupts;
+use embassy_rp::peripherals::USB;
+use embassy_rp::usb::{Driver, InterruptHandler};
+use embassy_usb::driver::{Endpoint, EndpointIn, EndpointOut};
+use embassy_usb::msos::{self, windows_version};
+use embassy_usb::{Builder, Config, Handler};
+use {defmt_rtt as _, panic_probe as _};
+
+// This is a randomly generated GUID to allow clients on Windows to find our device
+const DEVICE_INTERFACE_GUIDS: &[&str] = &["{AFB9A6FB-30BA-44BC-9232-806CFC875321}"];
+
+bind_interrupts!(struct Irqs {
+    USBCTRL_IRQ => InterruptHandler<USB>;
+});
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    info!("Hello there!");
+
+    let p = embassy_rp::init(Default::default());
+
+    // Create the driver, from the HAL.
+    let driver = Driver::new(p.USB, Irqs);
+
+    // Create embassy-usb Config
+    let mut config = Config::new(0xc0de, 0xcafe);
+    config.manufacturer = Some("Embassy");
+    config.product = Some("USB raw example");
+    config.serial_number = Some("12345678");
+    config.max_power = 100;
+    config.max_packet_size_0 = 64;
+
+    // // Required for windows compatibility.
+    // // https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.9.1/kconfig/CONFIG_CDC_ACM_IAD.html#help
+    config.device_class = 0xEF;
+    config.device_sub_class = 0x02;
+    config.device_protocol = 0x01;
+    config.composite_with_iads = true;
+
+    // Create embassy-usb DeviceBuilder using the driver and config.
+    // It needs some buffers for building the descriptors.
+    let mut device_descriptor = [0; 256];
+    let mut config_descriptor = [0; 256];
+    let mut bos_descriptor = [0; 256];
+    let mut msos_descriptor = [0; 256];
+    let mut control_buf = [0; 64];
+
+    let mut handler = ControlHandler;
+
+    let mut builder = Builder::new(
+        driver,
+        config,
+        &mut device_descriptor,
+        &mut config_descriptor,
+        &mut bos_descriptor,
+        &mut msos_descriptor,
+        &mut control_buf,
+    );
+
+    // Add the Microsoft OS Descriptor (MSOS/MOD) descriptor.
+    // We tell Windows that this entire device is compatible with the "WINUSB" feature,
+    // which causes it to use the built-in WinUSB driver automatically, which in turn
+    // can be used by libusb/rusb software without needing a custom driver or INF file.
+    // In principle you might want to call msos_feature() just on a specific function,
+    // if your device also has other functions that still use standard class drivers.
+    builder.msos_descriptor(windows_version::WIN8_1, 0);
+    builder.msos_feature(msos::CompatibleIdFeatureDescriptor::new("WINUSB", ""));
+    builder.msos_feature(msos::RegistryPropertyFeatureDescriptor::new(
+        "DeviceInterfaceGUIDs",
+        msos::PropertyData::RegMultiSz(DEVICE_INTERFACE_GUIDS),
+    ));
+
+    // Add a vendor-specific function (class 0xFF), and corresponding interface,
+    // that uses our custom handler.
+    let mut function = builder.function(0xFF, 0, 0);
+    let mut interface = function.interface();
+    let mut alt = interface.alt_setting(0xFF, 0, 0, None);
+    let mut read_ep = alt.endpoint_bulk_out(64);
+    let mut write_ep = alt.endpoint_bulk_in(64);
+
+    drop(function);
+    builder.handler(&mut handler);
+
+    // 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 {
+            read_ep.wait_enabled().await;
+            info!("Connected");
+            loop {
+                let mut data = [0; 64];
+                match read_ep.read(&mut data).await {
+                    Ok(n) => {
+                        info!("Got bulk: {:a}", data[..n]);
+                        // Echo back to the host:
+                        write_ep.write(&data[..n]).await.ok();
+                    }
+                    Err(_) => break,
+                }
+            }
+            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;
+}
+
+/// Handle CONTROL endpoint requests and responses.
+struct ControlHandler;
+impl Handler for ControlHandler {}