123 lines
3.7 KiB
Rust
123 lines
3.7 KiB
Rust
#![no_std]
|
|
#![no_main]
|
|
#![feature(type_alias_impl_trait)]
|
|
|
|
use defmt::{panic, *};
|
|
use defmt_rtt as _; // global logger
|
|
use embassy_executor::Spawner;
|
|
use embassy_stm32::rcc::*;
|
|
use embassy_stm32::usb_otg::{Driver, Instance};
|
|
use embassy_stm32::{bind_interrupts, peripherals, usb_otg, Config};
|
|
use embassy_usb::class::cdc_acm::{CdcAcmClass, State};
|
|
use embassy_usb::driver::EndpointError;
|
|
use embassy_usb::Builder;
|
|
use futures::future::join;
|
|
use panic_probe as _;
|
|
|
|
bind_interrupts!(struct Irqs {
|
|
OTG_FS => usb_otg::InterruptHandler<peripherals::USB_OTG_FS>;
|
|
});
|
|
|
|
#[embassy_executor::main]
|
|
async fn main(_spawner: Spawner) {
|
|
info!("Hello World!");
|
|
|
|
let mut config = Config::default();
|
|
config.rcc.hsi48 = Some(Hsi48Config { sync_from_usb: true }); // needed for USB
|
|
config.rcc.mux = ClockSrc::PLL1_R;
|
|
config.rcc.hsi = true;
|
|
config.rcc.pll = Some(Pll {
|
|
source: PllSource::HSI,
|
|
prediv: PllPreDiv::DIV1,
|
|
mul: PllMul::MUL10,
|
|
divp: None,
|
|
divq: None,
|
|
divr: Some(PllRDiv::DIV2), // sysclk 80Mhz (16 / 1 * 10 / 2)
|
|
});
|
|
|
|
let p = embassy_stm32::init(config);
|
|
|
|
// Create the driver, from the HAL.
|
|
let mut ep_out_buffer = [0u8; 256];
|
|
let mut config = embassy_stm32::usb_otg::Config::default();
|
|
config.vbus_detection = true;
|
|
let driver = Driver::new_fs(p.USB_OTG_FS, Irqs, p.PA12, p.PA11, &mut ep_out_buffer, config);
|
|
|
|
// Create embassy-usb Config
|
|
let mut config = embassy_usb::Config::new(0xc0de, 0xcafe);
|
|
config.max_packet_size_0 = 64;
|
|
config.manufacturer = Some("Embassy");
|
|
config.product = Some("USB-serial example");
|
|
config.serial_number = Some("12345678");
|
|
|
|
// Required for windows compatibility.
|
|
// https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.9.1/kconfig/CONFIG_CDC_ACM_IAD.html#help
|
|
config.device_class = 0xEF;
|
|
config.device_sub_class = 0x02;
|
|
config.device_protocol = 0x01;
|
|
config.composite_with_iads = true;
|
|
|
|
// 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; 64];
|
|
|
|
let mut state = State::new();
|
|
|
|
let mut builder = Builder::new(
|
|
driver,
|
|
config,
|
|
&mut device_descriptor,
|
|
&mut config_descriptor,
|
|
&mut bos_descriptor,
|
|
&mut [], // no msos descriptors
|
|
&mut control_buf,
|
|
);
|
|
|
|
// 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?;
|
|
}
|
|
}
|