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- //! CDC-ACM serial port example using polling in a busy loop.
- //! Target board: Blue Pill
- //!
- //! Note:
- //! When building this since this is a larger program,
- //! one would need to build it using release profile
- //! since debug profiles generates artifacts that
- //! cause FLASH overflow errors due to their size
- #![no_std]
- #![no_main]
- extern crate panic_semihosting;
- use cortex_m::asm::delay;
- use cortex_m_rt::entry;
- use embedded_hal::digital::v2::OutputPin;
- use stm32f1xx_hal::usb::{Peripheral, UsbBus};
- use stm32f1xx_hal::{prelude::*, stm32};
- use usb_device::prelude::*;
- use usbd_serial::{SerialPort, USB_CLASS_CDC};
- #[entry]
- fn main() -> ! {
- 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());
- // Configure the on-board LED (PC13, green)
- let mut gpioc = dp.GPIOC.split(&mut rcc.apb2);
- let mut led = gpioc.pc13.into_push_pull_output(&mut gpioc.crh);
- led.set_high(); // Turn off
- 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 = Peripheral {
- usb: dp.USB,
- pin_dm: gpioa.pa11,
- pin_dp: usb_dp.into_floating_input(&mut gpioa.crh),
- };
- let usb_bus = UsbBus::new(usb);
- let mut serial = SerialPort::new(&usb_bus);
- let mut usb_dev = UsbDeviceBuilder::new(&usb_bus, UsbVidPid(0x16c0, 0x27dd))
- .manufacturer("Fake company")
- .product("Serial port")
- .serial_number("TEST")
- .device_class(USB_CLASS_CDC)
- .build();
- loop {
- if !usb_dev.poll(&mut [&mut serial]) {
- continue;
- }
- let mut buf = [0u8; 64];
- match serial.read(&mut buf) {
- Ok(count) if count > 0 => {
- led.set_low(); // Turn on
- // Echo back in upper case
- for c in buf[0..count].iter_mut() {
- if 0x61 <= *c && *c <= 0x7a {
- *c &= !0x20;
- }
- }
- let mut write_offset = 0;
- while write_offset < count {
- match serial.write(&buf[write_offset..count]) {
- Ok(len) if len > 0 => {
- write_offset += len;
- }
- _ => {}
- }
- }
- }
- _ => {}
- }
- led.set_high(); // Turn off
- }
- }
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