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#![no_std]
#![no_main]
use defmt::{panic, *};
use embassy_executor::Spawner;
use embassy_futures::join::join;
use embassy_stm32::time::Hertz;
use embassy_stm32::usb::{self, Driver, Instance};
use embassy_stm32::{bind_interrupts, peripherals, Config};
use embassy_usb::class::cdc_acm::{CdcAcmClass, State};
use embassy_usb::driver::EndpointError;
use embassy_usb::Builder;
use {defmt_rtt as _, panic_probe as _};
bind_interrupts!(struct Irqs {
USB_LP => usb::InterruptHandler<peripherals::USB>;
});
#[embassy_executor::main]
async fn main(_spawner: Spawner) {
let mut config = Config::default();
{
use embassy_stm32::rcc::*;
// Sets up the Clock Recovery System (CRS) to use the USB SOF to trim the HSI48 oscillator.
config.rcc.hsi48 = Some(Hsi48Config { sync_from_usb: true });
config.rcc.hse = Some(Hse {
freq: Hertz(8_000_000),
mode: HseMode::Oscillator,
});
config.rcc.pll = Some(Pll {
source: PllSource::HSE,
prediv: PllPreDiv::DIV2,
mul: PllMul::MUL72,
divp: None,
divq: Some(PllQDiv::DIV6), // 48mhz
divr: Some(PllRDiv::DIV2), // Main system clock at 144 MHz
});
config.rcc.sys = Sysclk::PLL1_R;
config.rcc.boost = true; // BOOST!
config.rcc.mux.clk48sel = mux::Clk48sel::HSI48;
//config.rcc.mux.clk48sel = mux::Clk48sel::PLL1_Q; // uncomment to use PLL1_Q instead.
}
let p = embassy_stm32::init(config);
info!("Hello World!");
let driver = Driver::new(p.USB, Irqs, p.PA12, p.PA11);
let mut config = embassy_usb::Config::new(0xc0de, 0xcafe);
config.manufacturer = Some("Embassy");
config.product = Some("USB-Serial Example");
config.serial_number = Some("123456");
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 config_descriptor,
&mut bos_descriptor,
&mut [], // no msos descriptors
&mut control_buf,
);
let mut class = CdcAcmClass::new(&mut builder, &mut state, 64);
let mut usb = builder.build();
let usb_fut = usb.run();
let echo_fut = async {
loop {
class.wait_connection().await;
info!("Connected");
let _ = echo(&mut class).await;
info!("Disconnected");
}
};
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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