119 lines
3.5 KiB
Rust
119 lines
3.5 KiB
Rust
#![no_std]
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#![no_main]
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#![feature(type_alias_impl_trait)]
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use core::mem;
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use defmt::{info, panic, unwrap};
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use embassy_executor::Spawner;
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use embassy_nrf::usb::{Driver, PowerUsb};
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use embassy_nrf::{interrupt, pac, peripherals};
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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::{Builder, Config, UsbDevice};
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use static_cell::StaticCell;
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use {defmt_rtt as _, panic_probe as _};
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type MyDriver = Driver<'static, peripherals::USBD, PowerUsb>;
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#[embassy_executor::task]
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async fn usb_task(mut device: UsbDevice<'static, MyDriver>) {
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device.run().await;
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}
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#[embassy_executor::task]
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async fn echo_task(mut class: CdcAcmClass<'static, MyDriver>) {
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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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#[embassy_executor::main]
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async fn main(spawner: Spawner) {
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let p = embassy_nrf::init(Default::default());
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let clock: pac::CLOCK = 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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// Create the driver, from the HAL.
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let irq = interrupt::take!(USBD);
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let power_irq = interrupt::take!(POWER_CLOCK);
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let driver = Driver::new(p.USBD, irq, PowerUsb::new(power_irq));
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// Create embassy-usb Config
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let mut config = 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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// Required for windows compatiblity.
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// https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.9.1/kconfig/CONFIG_CDC_ACM_IAD.html#help
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config.device_class = 0xEF;
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config.device_sub_class = 0x02;
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config.device_protocol = 0x01;
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config.composite_with_iads = true;
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struct Resources {
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device_descriptor: [u8; 256],
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config_descriptor: [u8; 256],
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bos_descriptor: [u8; 256],
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control_buf: [u8; 64],
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serial_state: State<'static>,
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}
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static RESOURCES: StaticCell<Resources> = StaticCell::new();
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let res = RESOURCES.init(Resources {
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device_descriptor: [0; 256],
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config_descriptor: [0; 256],
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bos_descriptor: [0; 256],
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control_buf: [0; 64],
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serial_state: State::new(),
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});
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// Create embassy-usb DeviceBuilder using the driver and config.
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let mut builder = Builder::new(
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driver,
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config,
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&mut res.device_descriptor,
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&mut res.config_descriptor,
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&mut res.bos_descriptor,
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&mut res.control_buf,
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None,
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);
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// Create classes on the builder.
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let class = CdcAcmClass::new(&mut builder, &mut res.serial_state, 64);
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// Build the builder.
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let usb = builder.build();
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unwrap!(spawner.spawn(usb_task(usb)));
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unwrap!(spawner.spawn(echo_task(class)));
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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(class: &mut CdcAcmClass<'static, MyDriver>) -> 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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