111 lines
3.1 KiB
Rust
111 lines
3.1 KiB
Rust
//! 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 serial port that echos.
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#![no_std]
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#![no_main]
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use defmt::{info, panic, unwrap};
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use embassy_executor::Spawner;
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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::cdc_acm::{CdcAcmClass, State};
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use embassy_usb::driver::EndpointError;
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use embassy_usb::UsbDevice;
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use static_cell::StaticCell;
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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 there!");
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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 config = {
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let mut config = embassy_usb::Config::new(0xc0de, 0xcafe);
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config.manufacturer = Some("Embassy");
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config.product = Some("USB-serial 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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config
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};
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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 builder = {
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static CONFIG_DESCRIPTOR: StaticCell<[u8; 256]> = StaticCell::new();
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static BOS_DESCRIPTOR: StaticCell<[u8; 256]> = StaticCell::new();
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static CONTROL_BUF: StaticCell<[u8; 64]> = StaticCell::new();
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let builder = embassy_usb::Builder::new(
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driver,
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config,
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CONFIG_DESCRIPTOR.init([0; 256]),
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BOS_DESCRIPTOR.init([0; 256]),
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&mut [], // no msos descriptors
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CONTROL_BUF.init([0; 64]),
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);
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builder
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};
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// Create classes on the builder.
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let mut class = {
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static STATE: StaticCell<State> = StaticCell::new();
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let state = STATE.init(State::new());
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CdcAcmClass::new(&mut builder, state, 64)
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};
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// Build the builder.
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let usb = builder.build();
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// Run the USB device.
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unwrap!(spawner.spawn(usb_task(usb)));
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// Do stuff with the class!
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loop {
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class.wait_connection().await;
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info!("Connected");
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let _ = echo(&mut class).await;
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info!("Disconnected");
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}
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}
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type MyUsbDriver = Driver<'static, USB>;
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type MyUsbDevice = UsbDevice<'static, MyUsbDriver>;
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#[embassy_executor::task]
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async fn usb_task(mut usb: MyUsbDevice) -> ! {
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usb.run().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 echo<'d, T: Instance + 'd>(class: &mut CdcAcmClass<'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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