111 lines
3.3 KiB
Rust
111 lines
3.3 KiB
Rust
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//! This example shows how to use USB (Universal Serial Bus) in the RP2040 chip.
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//!
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//! This creates a USB MIDI device that echoes MIDI messages back to the host.
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#![no_std]
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#![no_main]
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#![feature(type_alias_impl_trait)]
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use defmt::{info, panic};
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use embassy_executor::Spawner;
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use embassy_futures::join::join;
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use embassy_rp::bind_interrupts;
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use embassy_rp::peripherals::USB;
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use embassy_rp::usb::{Driver, Instance, InterruptHandler};
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use embassy_usb::class::midi::MidiClass;
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use embassy_usb::driver::EndpointError;
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use embassy_usb::{Builder, Config};
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use {defmt_rtt as _, panic_probe as _};
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bind_interrupts!(struct Irqs {
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USBCTRL_IRQ => InterruptHandler<USB>;
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});
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#[embassy_executor::main]
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async fn main(_spawner: Spawner) {
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info!("Hello world!");
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let p = embassy_rp::init(Default::default());
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// Create the driver, from the HAL.
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let driver = Driver::new(p.USB, Irqs);
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// Create embassy-usb Config
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let mut config = Config::new(0xc0de, 0xcafe);
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config.manufacturer = Some("Embassy");
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config.product = Some("USB-MIDI example");
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config.serial_number = Some("12345678");
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config.max_power = 100;
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config.max_packet_size_0 = 64;
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// Required for windows compatibility.
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// https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.9.1/kconfig/CONFIG_CDC_ACM_IAD.html#help
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config.device_class = 0xEF;
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config.device_sub_class = 0x02;
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config.device_protocol = 0x01;
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config.composite_with_iads = true;
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// Create embassy-usb DeviceBuilder using the driver and config.
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// It needs some buffers for building the descriptors.
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let mut device_descriptor = [0; 256];
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let mut config_descriptor = [0; 256];
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let mut bos_descriptor = [0; 256];
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let mut control_buf = [0; 64];
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let mut builder = Builder::new(
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driver,
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config,
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&mut device_descriptor,
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&mut config_descriptor,
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&mut bos_descriptor,
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&mut control_buf,
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);
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// Create classes on the builder.
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let mut class = MidiClass::new(&mut builder, 1, 1, 64);
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// The `MidiClass` can be split into `Sender` and `Receiver`, to be used in separate tasks.
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// let (sender, receiver) = class.split();
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// Build the builder.
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let mut usb = builder.build();
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// Run the USB device.
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let usb_fut = usb.run();
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// Use the Midi class!
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let midi_fut = async {
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loop {
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class.wait_connection().await;
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info!("Connected");
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let _ = midi_echo(&mut class).await;
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info!("Disconnected");
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}
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};
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// Run everything concurrently.
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// If we had made everything `'static` above instead, we could do this using separate tasks instead.
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join(usb_fut, midi_fut).await;
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}
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struct Disconnected {}
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impl From<EndpointError> for Disconnected {
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fn from(val: EndpointError) -> Self {
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match val {
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EndpointError::BufferOverflow => panic!("Buffer overflow"),
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EndpointError::Disabled => Disconnected {},
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}
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}
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}
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async fn midi_echo<'d, T: Instance + 'd>(class: &mut MidiClass<'d, Driver<'d, T>>) -> Result<(), Disconnected> {
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let mut buf = [0; 64];
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loop {
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let n = class.read_packet(&mut buf).await?;
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let data = &buf[..n];
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info!("data: {:x}", data);
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class.write_packet(data).await?;
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}
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}
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