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#![no_std]
#![no_main]
#![feature(type_alias_impl_trait)]
use defmt::{panic, *};
use embassy_executor::executor::Spawner;
use embassy_executor::time::{Duration, Timer};
use embassy_stm32::gpio::{Level, Output, Speed};
use embassy_stm32::time::Hertz;
use embassy_stm32::usb::{Driver, Instance};
use embassy_stm32::{interrupt, Config};
use embassy_usb::driver::EndpointError;
use embassy_usb::Builder;
use embassy_usb_serial::{CdcAcmClass, State};
use futures::future::join;
use {defmt_rtt as _, panic_probe as _};
#[embassy_executor::main]
async fn main(_spawner: Spawner) {
let mut config = Config::default();
config.rcc.hse = Some(Hertz(8_000_000));
config.rcc.sys_ck = Some(Hertz(48_000_000));
config.rcc.pclk1 = Some(Hertz(24_000_000));
let mut p = embassy_stm32::init(config);
info!("Hello World!");
{
// BluePill board has a pull-up resistor on the D+ line.
// Pull the D+ pin down to send a RESET condition to the USB bus.
// This forced reset is needed only for development, without it host
// will not reset your device when you upload new firmware.
let _dp = Output::new(&mut p.PA12, Level::Low, Speed::Low);
Timer::after(Duration::from_millis(10)).await;
}
// Create the driver, from the HAL.
let irq = interrupt::take!(USB_LP_CAN1_RX0);
let driver = Driver::new(p.USB, irq, p.PA12, p.PA11);
// Create embassy-usb Config
let config = embassy_usb::Config::new(0xc0de, 0xcafe);
//config.max_packet_size_0 = 64;
// Create embassy-usb DeviceBuilder using the driver and config.
// It needs some buffers for building the descriptors.
let mut device_descriptor = [0; 256];
let mut config_descriptor = [0; 256];
let mut bos_descriptor = [0; 256];
let mut control_buf = [0; 7];
let mut state = State::new();
let mut builder = Builder::new(
driver,
config,
&mut device_descriptor,
&mut config_descriptor,
&mut bos_descriptor,
&mut control_buf,
None,
);
// Create classes on the builder.
let mut class = CdcAcmClass::new(&mut builder, &mut state, 64);
// Build the builder.
let mut usb = builder.build();
// Run the USB device.
let usb_fut = usb.run();
// Do stuff with the class!
let echo_fut = async {
loop {
class.wait_connection().await;
info!("Connected");
let _ = echo(&mut class).await;
info!("Disconnected");
}
};
// Run everything concurrently.
// If we had made everything `'static` above instead, we could do this using separate tasks instead.
join(usb_fut, echo_fut).await;
}
struct Disconnected {}
impl From<EndpointError> for Disconnected {
fn from(val: EndpointError) -> Self {
match val {
EndpointError::BufferOverflow => panic!("Buffer overflow"),
EndpointError::Disabled => Disconnected {},
}
}
}
async fn echo<'d, T: Instance + 'd>(class: &mut CdcAcmClass<'d, Driver<'d, T>>) -> Result<(), Disconnected> {
let mut buf = [0; 64];
loop {
let n = class.read_packet(&mut buf).await?;
let data = &buf[..n];
info!("data: {:x}", data);
class.write_packet(data).await?;
}
}
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