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//! This example shows how to use USB (Universal Serial Bus) in the RP2040 chip.
//!
//! This creates a USB serial port that echos.
#![no_std]
#![no_main]
use defmt::{info, panic, unwrap};
use embassy_executor::Spawner;
use embassy_rp::bind_interrupts;
use embassy_rp::peripherals::USB;
use embassy_rp::usb::{Driver, Instance, InterruptHandler};
use embassy_usb::UsbDevice;
use embassy_usb::class::cdc_acm::{CdcAcmClass, State};
use embassy_usb::driver::EndpointError;
use static_cell::StaticCell;
use {defmt_rtt as _, panic_probe as _};
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 config = {
let mut config = embassy_usb::Config::new(0xc0de, 0xcafe);
config.manufacturer = Some("Embassy");
config.product = Some("USB-serial example");
config.serial_number = Some("12345678");
config.max_power = 100;
config.max_packet_size_0 = 64;
config
};
// Create embassy-usb DeviceBuilder using the driver and config.
// It needs some buffers for building the descriptors.
let mut builder = {
static CONFIG_DESCRIPTOR: StaticCell<[u8; 256]> = StaticCell::new();
static BOS_DESCRIPTOR: StaticCell<[u8; 256]> = StaticCell::new();
static CONTROL_BUF: StaticCell<[u8; 64]> = StaticCell::new();
let builder = embassy_usb::Builder::new(
driver,
config,
CONFIG_DESCRIPTOR.init([0; 256]),
BOS_DESCRIPTOR.init([0; 256]),
&mut [], // no msos descriptors
CONTROL_BUF.init([0; 64]),
);
builder
};
// Create classes on the builder.
let mut class = {
static STATE: StaticCell<State> = StaticCell::new();
let state = STATE.init(State::new());
CdcAcmClass::new(&mut builder, state, 64)
};
// Build the builder.
let usb = builder.build();
// Run the USB device.
spawner.spawn(unwrap!(usb_task(usb)));
// Do stuff with the class!
loop {
class.wait_connection().await;
info!("Connected");
let _ = echo(&mut class).await;
info!("Disconnected");
}
}
type MyUsbDriver = Driver<'static, USB>;
type MyUsbDevice = UsbDevice<'static, MyUsbDriver>;
#[embassy_executor::task]
async fn usb_task(mut usb: MyUsbDevice) -> ! {
usb.run().await
}
struct Disconnected {}
impl From<EndpointError> for Disconnected {
fn from(val: EndpointError) -> Self {
match val {
EndpointError::BufferOverflow => panic!("Buffer overflow"),
EndpointError::Disabled => Disconnected {},
}
}
}
async fn echo<'d, T: Instance + 'd>(class: &mut CdcAcmClass<'d, Driver<'d, T>>) -> Result<(), Disconnected> {
let mut buf = [0; 64];
loop {
let n = class.read_packet(&mut buf).await?;
let data = &buf[..n];
info!("data: {:x}", data);
class.write_packet(data).await?;
}
}
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