8785fbc6f1
Eliminated a signal by using a simpler trait method that returns whether VBus power is available. Also includes a UsbSupply that can be signalled for use with the nRF softdevice. Includes the requirement for waiting for power to become available.
111 lines
3.3 KiB
Rust
111 lines
3.3 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::usb::{Driver, Instance, PowerUsb, UsbSupply};
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use embassy_nrf::{interrupt, pac, Peripherals};
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use embassy_usb::driver::EndpointError;
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use embassy_usb::{Builder, Config};
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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 _, 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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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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// 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; 64];
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let mut state = State::new();
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let mut builder = Builder::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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None,
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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<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<'d, T: Instance + 'd, P: UsbSupply + 'd>(
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class: &mut CdcAcmClass<'d, Driver<'d, T, P>>,
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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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