121 lines
3.4 KiB
Rust
121 lines
3.4 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::{Clock48MhzSrc, ClockSrc, CrsConfig, CrsSyncSource, Pll, PllM, PllN, PllQ, PllR, PllSrc};
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use embassy_stm32::time::Hertz;
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use embassy_stm32::usb::{self, Driver, Instance};
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use embassy_stm32::{bind_interrupts, peripherals, 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_LP => 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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// Change this to `false` to use the HSE clock source for the USB. This example assumes an 8MHz HSE.
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const USE_HSI48: bool = true;
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let pllq_div = if USE_HSI48 { None } else { Some(PllQ::Div6) };
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config.rcc.pll = Some(Pll {
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source: PllSrc::HSE(Hertz(8_000_000)),
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prediv_m: PllM::Div2,
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mul_n: PllN::Mul72,
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div_p: None,
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div_q: pllq_div,
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// Main system clock at 144 MHz
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div_r: Some(PllR::Div2),
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});
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config.rcc.mux = ClockSrc::PLL;
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if USE_HSI48 {
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// Sets up the Clock Recovery System (CRS) to use the USB SOF to trim the HSI48 oscillator.
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config.rcc.clock_48mhz_src = Some(Clock48MhzSrc::Hsi48(Some(CrsConfig {
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sync_src: CrsSyncSource::Usb,
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})));
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} else {
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config.rcc.clock_48mhz_src = Some(Clock48MhzSrc::PllQ);
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}
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let p = embassy_stm32::init(config);
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info!("Hello World!");
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let driver = Driver::new(p.USB, Irqs, p.PA12, p.PA11);
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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("123456");
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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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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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let mut class = CdcAcmClass::new(&mut builder, &mut state, 64);
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let mut usb = builder.build();
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let usb_fut = usb.run();
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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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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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