133 lines
3.7 KiB
Rust
133 lines
3.7 KiB
Rust
#![no_std]
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#![no_main]
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extern crate panic_semihosting;
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use core::cell::RefCell;
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use core::ops::DerefMut;
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use cortex_m::asm::wfi;
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use cortex_m::peripheral::NVIC;
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use cortex_m::interrupt::{free as interrupt_free, Mutex};
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use cortex_m_rt::entry;
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use embedded_hal::digital::v2::OutputPin;
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use stm32f1xx_hal::stm32::{self, interrupt, Interrupt};
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use stm32f1xx_hal::{delay::Delay, prelude::*};
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use stm32f1xx_hal::usb::{Peripheral, UsbBusType};
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use usb_device::bus::UsbBusAllocator;
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use usb_device::prelude::*;
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use usbd_serial::{SerialPort, USB_CLASS_CDC};
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static mut USB_BUS: Option<UsbBusAllocator<UsbBusType>> = None;
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static USB_DEVICE: Mutex<RefCell<Option<UsbDevice<'static, UsbBusType>>>> =
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Mutex::new(RefCell::new(None));
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static SERIAL: Mutex<RefCell<Option<SerialPort<'static, UsbBusType>>>> =
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Mutex::new(RefCell::new(None));
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#[entry]
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fn main() -> ! {
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let cp = cortex_m::Peripherals::take().unwrap();
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let dp = stm32::Peripherals::take().unwrap();
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let mut flash = dp.FLASH.constrain();
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let mut rcc = dp.RCC.constrain();
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let clocks = rcc
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.cfgr
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.use_hse(8.mhz())
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.sysclk(48.mhz())
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.pclk1(24.mhz())
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.freeze(&mut flash.acr);
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assert!(clocks.usbclk_valid());
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let mut delay = Delay::new(cp.SYST, clocks);
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// Configure the on-board LED (PC13, green)
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let mut gpioc = dp.GPIOC.split(&mut rcc.apb2);
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let mut led = gpioc.pc13.into_push_pull_output(&mut gpioc.crh);
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led.set_high().ok(); // Turn off
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let mut gpioa = dp.GPIOA.split(&mut rcc.apb2);
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let mut usb_dp = gpioa.pa12.into_push_pull_output(&mut gpioa.crh);
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usb_dp.set_low().unwrap();
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delay.delay_ms(10u16);
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let usb_bus;
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unsafe {
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let usb_peripherial = Peripheral {
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usb: dp.USB,
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pin_dm: gpioa.pa11,
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pin_dp: usb_dp.into_floating_input(&mut gpioa.crh),
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};
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USB_BUS = Some(UsbBusType::new(usb_peripherial));
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usb_bus = USB_BUS.as_ref().unwrap();
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}
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interrupt_free(|cs| {
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SERIAL.borrow(cs).replace(Some(SerialPort::new(usb_bus)));
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USB_DEVICE.borrow(cs).replace(Some(
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UsbDeviceBuilder::new(usb_bus, UsbVidPid(0x16c0, 0x27dd))
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.manufacturer("Ar3itrary Embedded")
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.product("usart-demo")
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.serial_number("2342")
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.device_class(USB_CLASS_CDC)
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.build(),
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));
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});
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unsafe {
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NVIC::unmask(Interrupt::USB_HP_CAN_TX);
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NVIC::unmask(Interrupt::USB_LP_CAN_RX0);
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}
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loop {
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wfi();
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}
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}
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#[interrupt]
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fn USB_HP_CAN_TX() {
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usb_interrupt();
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}
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#[interrupt]
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fn USB_LP_CAN_RX0() {
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usb_interrupt();
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}
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fn usb_interrupt() {
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interrupt_free(|cs| {
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match USB_DEVICE.borrow(cs).borrow_mut().deref_mut() {
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Some(usb_dev) => {
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match SERIAL.borrow(cs).borrow_mut().deref_mut() {
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Some(serial) => {
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if !usb_dev.poll(&mut [serial]) {
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return;
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}
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let mut buf = [0u8; 8];
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match serial.read(&mut buf) {
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Ok(count) if count > 0 => {
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// Echo back in upper case
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for c in buf[0..count].iter_mut() {
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if 0x61 <= *c && *c <= 0x7a {
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*c &= !0x20;
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}
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}
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serial.write(&buf[0..count]).ok();
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}
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_ => {}
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};
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}
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_ => {}
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};
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}
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_ => {}
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};
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});
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}
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