114 lines
3.1 KiB
Rust
114 lines
3.1 KiB
Rust
#![no_std]
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#![no_main]
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#![feature(generic_associated_types)]
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#![feature(type_alias_impl_trait)]
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use core::mem;
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use defmt::{info, panic};
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use embassy::executor::Spawner;
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use embassy_nrf::interrupt;
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use embassy_nrf::pac;
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use embassy_nrf::usb::{Driver, Instance};
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use embassy_nrf::Peripherals;
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use embassy_usb::driver::{ReadError, WriteError};
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use embassy_usb::{Config, UsbDeviceBuilder};
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use embassy_usb_serial::{CdcAcmClass, State};
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use futures::future::join;
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use defmt_rtt as _; // global logger
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use panic_probe as _;
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#[embassy::main]
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async fn main(_spawner: Spawner, p: Peripherals) {
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let clock: pac::CLOCK = unsafe { mem::transmute(()) };
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let power: pac::POWER = unsafe { mem::transmute(()) };
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info!("Enabling ext hfosc...");
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clock.tasks_hfclkstart.write(|w| unsafe { w.bits(1) });
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while clock.events_hfclkstarted.read().bits() != 1 {}
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info!("Waiting for vbus...");
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while !power.usbregstatus.read().vbusdetect().is_vbus_present() {}
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info!("vbus OK");
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// Create the driver, from the HAL.
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let irq = interrupt::take!(USBD);
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let driver = Driver::new(p.USBD, irq);
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// Create embassy-usb Config
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let config = Config::new(0xc0de, 0xcafe);
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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; 7];
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let mut state = State::new();
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let mut builder = UsbDeviceBuilder::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 = CdcAcmClass::new(&mut builder, &mut state, 64);
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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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// Do stuff with the class!
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let echo_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 _ = 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, echo_fut).await;
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}
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struct Disconnected {}
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impl From<ReadError> for Disconnected {
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fn from(val: ReadError) -> Self {
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match val {
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ReadError::BufferOverflow => panic!("Buffer overflow"),
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ReadError::Disabled => Disconnected {},
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}
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}
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}
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impl From<WriteError> for Disconnected {
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fn from(val: WriteError) -> Self {
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match val {
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WriteError::BufferOverflow => panic!("Buffer overflow"),
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WriteError::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>(
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class: &mut CdcAcmClass<'d, Driver<'d, T>>,
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) -> 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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