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- //! CDC-ACM serial port example using interrupts.
- //! Target board: Blue Pill
- #![no_std]
- #![no_main]
- extern crate panic_semihosting;
- use cortex_m::asm::{delay, wfi};
- use cortex_m_rt::entry;
- use embedded_hal::digital::v2::OutputPin;
- use stm32f1xx_hal::pac::{interrupt, Interrupt};
- use stm32f1xx_hal::usb::{Peripheral, UsbBus, UsbBusType};
- use stm32f1xx_hal::{prelude::*, stm32};
- use usb_device::{bus::UsbBusAllocator, prelude::*};
- use usbd_serial::{SerialPort, USB_CLASS_CDC};
- static mut USB_BUS: Option<UsbBusAllocator<UsbBusType>> = None;
- static mut USB_SERIAL: Option<usbd_serial::SerialPort<UsbBusType>> = None;
- static mut USB_DEVICE: Option<UsbDevice<UsbBusType>> = None;
- #[entry]
- fn main() -> ! {
- let p = cortex_m::Peripherals::take().unwrap();
- let dp = pac::Peripherals::take().unwrap();
- let mut flash = dp.FLASH.constrain();
- let mut rcc = dp.RCC.constrain();
- let clocks = rcc
- .cfgr
- .use_hse(8.mhz())
- .sysclk(48.mhz())
- .pclk1(24.mhz())
- .freeze(&mut flash.acr);
- assert!(clocks.usbclk_valid());
- let mut gpioa = dp.GPIOA.split(&mut rcc.apb2);
- // 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 mut usb_dp = gpioa.pa12.into_push_pull_output(&mut gpioa.crh);
- usb_dp.set_low();
- delay(clocks.sysclk().0 / 100);
- let usb_dm = gpioa.pa11;
- let usb_dp = usb_dp.into_floating_input(&mut gpioa.crh);
- let usb = Peripheral {
- usb: dp.USB,
- pin_dm: usb_dm,
- pin_dp: usb_dp,
- };
- // Unsafe to allow access to static variables
- unsafe {
- let bus = UsbBus::new(usb);
- USB_BUS = Some(bus);
- USB_SERIAL = Some(SerialPort::new(USB_BUS.as_ref().unwrap()));
- let usb_dev = UsbDeviceBuilder::new(USB_BUS.as_ref().unwrap(), UsbVidPid(0x16c0, 0x27dd))
- .manufacturer("Fake company")
- .product("Serial port")
- .serial_number("TEST")
- .device_class(USB_CLASS_CDC)
- .build();
- USB_DEVICE = Some(usb_dev);
- }
- let mut nvic = p.NVIC;
- nvic.enable(Interrupt::USB_HP_CAN_TX);
- nvic.enable(Interrupt::USB_LP_CAN_RX0);
- loop {
- wfi();
- }
- }
- #[interrupt]
- fn USB_HP_CAN_TX() {
- usb_interrupt();
- }
- #[interrupt]
- fn USB_LP_CAN_RX0() {
- usb_interrupt();
- }
- fn usb_interrupt() {
- let usb_dev = unsafe { USB_DEVICE.as_mut().unwrap() };
- let serial = unsafe { USB_SERIAL.as_mut().unwrap() };
- if !usb_dev.poll(&mut [serial]) {
- return;
- }
- let mut buf = [0u8; 8];
- match serial.read(&mut buf) {
- Ok(count) if count > 0 => {
- // Echo back in upper case
- for c in buf[0..count].iter_mut() {
- if 0x61 <= *c && *c <= 0x7a {
- *c &= !0x20;
- }
- }
- serial.write(&buf[0..count]).ok();
- }
- _ => {}
- }
- }
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