130 lines
3.8 KiB
Rust
130 lines
3.8 KiB
Rust
#![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 embassy_executor::Spawner;
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use embassy_stm32::rcc::{AHBPrescaler, APBPrescaler, Hse, HseMode, Pll, PllSource, Sysclk, VoltageScale};
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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::{bind_interrupts, pac, peripherals, usb, Config};
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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;
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use futures::future::join;
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use {defmt_rtt as _, panic_probe as _};
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bind_interrupts!(struct Irqs {
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USB_DRD_FS => usb::InterruptHandler<peripherals::USB>;
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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 mut config = Config::default();
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config.rcc.hsi = None;
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config.rcc.hsi48 = true; // needed for usb
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config.rcc.hse = Some(Hse {
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freq: Hertz(8_000_000),
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mode: HseMode::BypassDigital,
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});
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config.rcc.pll1 = Some(Pll {
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source: PllSource::Hse,
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prediv: 2,
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mul: 125,
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divp: Some(2), // 250mhz
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divq: None,
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divr: None,
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});
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config.rcc.ahb_pre = AHBPrescaler::Div2;
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config.rcc.apb1_pre = APBPrescaler::Div4;
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config.rcc.apb2_pre = APBPrescaler::Div2;
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config.rcc.apb3_pre = APBPrescaler::Div4;
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config.rcc.sys = Sysclk::Pll1P;
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config.rcc.voltage_scale = VoltageScale::Scale0;
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let p = embassy_stm32::init(config);
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info!("Hello World!");
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pac::RCC.ccipr4().write(|w| {
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w.set_usbsel(pac::rcc::vals::Usbsel::HSI48);
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});
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// Create the driver, from the HAL.
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let driver = Driver::new(p.USB, Irqs, p.PA12, p.PA11);
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// Create embassy-usb Config
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let mut config = embassy_usb::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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// Required for windows compatibility.
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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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);
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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>(class: &mut CdcAcmClass<'d, Driver<'d, T>>) -> 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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