113 lines
2.9 KiB
Rust
113 lines
2.9 KiB
Rust
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#![no_std]
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#![no_main]
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#![feature(type_alias_impl_trait)]
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use defmt::panic;
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use defmt::*;
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use defmt_rtt as _; // global logger
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use embassy::executor::Spawner;
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use embassy_stm32::interrupt;
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use embassy_stm32::rcc::*;
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use embassy_stm32::time::Hertz;
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use embassy_stm32::usb::{Driver, Instance};
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use embassy_stm32::{Config, Peripherals};
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use embassy_usb::driver::EndpointError;
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use embassy_usb::Builder;
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use embassy_usb_serial::{CdcAcmClass, State};
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use futures::future::join;
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use panic_probe as _;
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fn config() -> Config {
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let mut config = Config::default();
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config.rcc.mux = ClockSrc::HSE(Hertz(16_000_000));
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config.rcc.mux = ClockSrc::PLL(
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PLLSource::HSI16,
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PLLClkDiv::Div2,
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PLLSrcDiv::Div1,
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PLLMul::Mul10,
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None,
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);
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config.rcc.hsi48 = true;
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config
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}
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#[embassy::main(config = "config()")]
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async fn main(_spawner: Spawner, p: Peripherals) {
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info!("Hello World!");
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// Create the driver, from the HAL.
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let irq = interrupt::take!(USB_FS);
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let driver = Driver::new(p.USB, irq, p.PA12, p.PA11);
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// Create embassy-usb Config
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let config = embassy_usb::Config::new(0xc0de, 0xcafe);
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//config.max_packet_size_0 = 64;
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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 = 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>(
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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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