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#![no_std]
#![no_main]
#![feature(generic_associated_types)]
#![feature(type_alias_impl_trait)]
use core::mem;
use defmt::{info, panic};
use embassy::executor::Spawner;
use embassy_nrf::interrupt;
use embassy_nrf::pac;
use embassy_nrf::usb::{Driver, Instance};
use embassy_nrf::Peripherals;
use embassy_usb::driver::EndpointError;
use embassy_usb::{Config, UsbDeviceBuilder};
use embassy_usb_serial::{CdcAcmClass, State};
use futures::future::join;
use defmt_rtt as _; // global logger
use panic_probe as _;
#[embassy::main]
async fn main(_spawner: Spawner, p: Peripherals) {
let clock: pac::CLOCK = unsafe { mem::transmute(()) };
let power: pac::POWER = unsafe { mem::transmute(()) };
info!("Enabling ext hfosc...");
clock.tasks_hfclkstart.write(|w| unsafe { w.bits(1) });
while clock.events_hfclkstarted.read().bits() != 1 {}
info!("Waiting for vbus...");
while !power.usbregstatus.read().vbusdetect().is_vbus_present() {}
info!("vbus OK");
// Create the driver, from the HAL.
let irq = interrupt::take!(USBD);
let driver = Driver::new(p.USBD, irq);
// Create embassy-usb Config
let config = Config::new(0xc0de, 0xcafe);
// 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 control_buf = [0; 7];
let mut state = State::new();
let mut builder = UsbDeviceBuilder::new(
driver,
config,
&mut device_descriptor,
&mut config_descriptor,
&mut bos_descriptor,
&mut control_buf,
);
// Create classes on the builder.
let mut class = CdcAcmClass::new(&mut builder, &mut state, 64);
// Build the builder.
let mut usb = builder.build().await;
// Run the USB device.
let usb_fut = usb.run();
// Do stuff with the class!
let echo_fut = async {
loop {
class.wait_connection().await;
info!("Connected");
let _ = echo(&mut class).await;
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;
}
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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