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#![no_std]
#![no_main]
use defmt::{info, panic};
use embassy_executor::Spawner;
use embassy_futures::join::join;
use embassy_nrf::usb::Driver;
use embassy_nrf::usb::vbus_detect::{HardwareVbusDetect, VbusDetect};
use embassy_nrf::{bind_interrupts, pac, peripherals, usb};
use embassy_usb::class::cdc_acm::{CdcAcmClass, State};
use embassy_usb::driver::EndpointError;
use embassy_usb::{Builder, Config};
use {defmt_rtt as _, panic_probe as _};
bind_interrupts!(struct Irqs {
USBD => usb::InterruptHandler<peripherals::USBD>;
CLOCK_POWER => usb::vbus_detect::InterruptHandler;
});
#[embassy_executor::main]
async fn main(_spawner: Spawner) {
let p = embassy_nrf::init(Default::default());
info!("Enabling ext hfosc...");
pac::CLOCK.tasks_hfclkstart().write_value(1);
while pac::CLOCK.events_hfclkstarted().read() != 1 {}
// Create the driver, from the HAL.
let driver = Driver::new(p.USBD, Irqs, HardwareVbusDetect::new(Irqs));
// Create embassy-usb Config
let mut config = 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;
// Create embassy-usb DeviceBuilder using the driver and config.
// It needs some buffers for building the descriptors.
let mut config_descriptor = [0; 256];
let mut bos_descriptor = [0; 256];
let mut msos_descriptor = [0; 256];
let mut control_buf = [0; 64];
let mut state = State::new();
let mut builder = Builder::new(
driver,
config,
&mut config_descriptor,
&mut bos_descriptor,
&mut msos_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();
// 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, V: VbusDetect + 'd>(class: &mut CdcAcmClass<'d, Driver<'d, V>>) -> 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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