diff --git a/examples/stm32l1/src/bin/usb_serial.rs b/examples/stm32l1/src/bin/usb_serial.rs new file mode 100644 index 000000000..7b1e84cbc --- /dev/null +++ b/examples/stm32l1/src/bin/usb_serial.rs @@ -0,0 +1,103 @@ +#![no_std] +#![no_main] + +use defmt::{panic, *}; +use embassy_executor::Spawner; +use embassy_stm32::usb::{self, Driver, Instance}; +use embassy_stm32::{bind_interrupts, peripherals}; +use embassy_usb::class::cdc_acm::{CdcAcmClass, State}; +use embassy_usb::driver::EndpointError; +use embassy_usb::Builder; +use futures::future::join; +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 = embassy_stm32::Config::default(); + { + use embassy_stm32::rcc::*; + config.rcc.hsi = true; + config.rcc.pll = Some(Pll { + source: PllSource::HSI, + mul: PllMul::MUL6, // PLLVCO = 16*6 = 96Mhz + div: PllDiv::DIV3, // 32Mhz clock (16 * 6 / 3) + }); + config.rcc.mux = ClockSrc::PLL1_R; + } + + 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"); + + config.device_class = 0xEF; + config.device_sub_class = 0x02; + config.device_protocol = 0x01; + config.composite_with_iads = true; + + 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, + ); + + 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?; + } +}