Added usb-hid keyboard example for rp pico.

examples/rp/Cargo.toml

@@ -40,6 +40,7 @@ display-interface = "0.4.1"
 byte-slice-cast = { version = "1.2.0", default-features = false }
 smart-leds = "0.3.0"
 heapless = "0.7.15"
+usbd-hid = "0.6.1"
 
 embedded-hal-1 = { package = "embedded-hal", version = "=1.0.0-alpha.11" }
 embedded-hal-async = "0.2.0-alpha.2"

examples/rp/src/bin/usb_hid_keyboard.rs

@@ -0,0 +1,188 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use core::sync::atomic::{AtomicBool, Ordering};
+
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_futures::join::join;
+use embassy_rp::bind_interrupts;
+use embassy_rp::gpio::{Input, Pull};
+use embassy_rp::peripherals::USB;
+use embassy_rp::usb::{Driver, InterruptHandler};
+use embassy_usb::class::hid::{HidReaderWriter, ReportId, RequestHandler, State};
+use embassy_usb::control::OutResponse;
+use embassy_usb::{Builder, Config, Handler};
+use usbd_hid::descriptor::{KeyboardReport, SerializedDescriptor};
+use {defmt_rtt as _, panic_probe as _};
+
+bind_interrupts!(struct Irqs {
+    USBCTRL_IRQ => InterruptHandler<USB>;
+});
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    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("HID keyboard example");
+    config.serial_number = Some("12345678");
+    config.max_power = 100;
+    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 device_descriptor = [0; 256];
+    let mut config_descriptor = [0; 256];
+    let mut bos_descriptor = [0; 256];
+    // You can also add a Microsoft OS descriptor.
+    // let mut msos_descriptor = [0; 256];
+    let mut control_buf = [0; 64];
+    let request_handler = MyRequestHandler {};
+    let mut device_handler = MyDeviceHandler::new();
+
+    let mut state = State::new();
+
+    let mut builder = Builder::new(
+        driver,
+        config,
+        &mut device_descriptor,
+        &mut config_descriptor,
+        &mut bos_descriptor,
+        // &mut msos_descriptor,
+        &mut control_buf,
+    );
+
+    builder.handler(&mut device_handler);
+
+    // Create classes on the builder.
+    let config = embassy_usb::class::hid::Config {
+        report_descriptor: KeyboardReport::desc(),
+        request_handler: Some(&request_handler),
+        poll_ms: 60,
+        max_packet_size: 64,
+    };
+    let hid = HidReaderWriter::<_, 1, 8>::new(&mut builder, &mut state, config);
+
+    // Build the builder.
+    let mut usb = builder.build();
+
+    // Run the USB device.
+    let usb_fut = usb.run();
+
+    // Set up the signal pin that will be used to trigger the keyboard.
+    let mut signal_pin = Input::new(p.PIN_16, Pull::None);
+
+    let (reader, mut writer) = hid.split();
+
+    // Do stuff with the class!
+    let in_fut = async {
+        loop {
+            info!("Waiting for HIGH on pin 16");
+            signal_pin.wait_for_high().await;
+            info!("HIGH DETECTED");
+            // Create a report with the A key pressed. (no shift modifier)
+            let report = KeyboardReport {
+                keycodes: [4, 0, 0, 0, 0, 0],
+                leds: 0,
+                modifier: 0,
+                reserved: 0,
+            };
+            // Send the report.
+            match writer.write_serialize(&report).await {
+                Ok(()) => {}
+                Err(e) => warn!("Failed to send report: {:?}", e),
+            };
+            signal_pin.wait_for_low().await;
+            info!("LOW DETECTED");
+            let report = KeyboardReport {
+                keycodes: [0, 0, 0, 0, 0, 0],
+                leds: 0,
+                modifier: 0,
+                reserved: 0,
+            };
+            match writer.write_serialize(&report).await {
+                Ok(()) => {}
+                Err(e) => warn!("Failed to send report: {:?}", e),
+            };
+        }
+    };
+
+    let out_fut = async {
+        reader.run(false, &request_handler).await;
+    };
+
+    // Run everything concurrently.
+    // If we had made everything `'static` above instead, we could do this using separate tasks instead.
+    join(usb_fut, join(in_fut, out_fut)).await;
+}
+
+struct MyRequestHandler {}
+
+impl RequestHandler for MyRequestHandler {
+    fn get_report(&self, id: ReportId, _buf: &mut [u8]) -> Option<usize> {
+        info!("Get report for {:?}", id);
+        None
+    }
+
+    fn set_report(&self, id: ReportId, data: &[u8]) -> OutResponse {
+        info!("Set report for {:?}: {=[u8]}", id, data);
+        OutResponse::Accepted
+    }
+
+    fn set_idle_ms(&self, id: Option<ReportId>, dur: u32) {
+        info!("Set idle rate for {:?} to {:?}", id, dur);
+    }
+
+    fn get_idle_ms(&self, id: Option<ReportId>) -> Option<u32> {
+        info!("Get idle rate for {:?}", id);
+        None
+    }
+}
+
+struct MyDeviceHandler {
+    configured: AtomicBool,
+}
+
+impl MyDeviceHandler {
+    fn new() -> Self {
+        MyDeviceHandler {
+            configured: AtomicBool::new(false),
+        }
+    }
+}
+
+impl Handler for MyDeviceHandler {
+    fn enabled(&mut self, enabled: bool) {
+        self.configured.store(false, Ordering::Relaxed);
+        if enabled {
+            info!("Device enabled");
+        } else {
+            info!("Device disabled");
+        }
+    }
+
+    fn reset(&mut self) {
+        self.configured.store(false, Ordering::Relaxed);
+        info!("Bus reset, the Vbus current limit is 100mA");
+    }
+
+    fn addressed(&mut self, addr: u8) {
+        self.configured.store(false, Ordering::Relaxed);
+        info!("USB address set to: {}", addr);
+    }
+
+    fn configured(&mut self, configured: bool) {
+        self.configured.store(configured, Ordering::Relaxed);
+        if configured {
+            info!("Device configured, it may now draw up to the configured current limit from Vbus.")
+        } else {
+            info!("Device is no longer configured, the Vbus current limit is 100mA.");
+        }
+    }
+}