95 lines
2.6 KiB
Rust
95 lines
2.6 KiB
Rust
#![no_std]
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#![no_main]
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extern crate panic_semihosting;
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use cortex_m::asm::delay;
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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::usb::{Peripheral, UsbBus};
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use stm32f1xx_hal::{prelude::*, stm32};
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use usb_device::prelude::*;
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use usbd_serial::{SerialPort, USB_CLASS_CDC};
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#[entry]
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fn main() -> ! {
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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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// 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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// BluePill board has a pull-up resistor on the D+ line.
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// Pull the D+ pin down to send a RESET condition to the USB bus.
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// This forced reset is needed only for development, without it host
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// will not reset your device when you upload new firmware.
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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().ok();
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delay(clocks.sysclk().0 / 100);
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let usb = 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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let usb_bus = UsbBus::new(usb);
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let mut serial = SerialPort::new(&usb_bus);
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let mut usb_dev = UsbDeviceBuilder::new(&usb_bus, UsbVidPid(0x16c0, 0x27dd))
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.manufacturer("Fake company")
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.product("Serial port")
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.serial_number("TEST")
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.device_class(USB_CLASS_CDC)
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.build();
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loop {
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if !usb_dev.poll(&mut [&mut serial]) {
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continue;
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}
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let mut buf = [0u8; 64];
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match serial.read(&mut buf) {
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Ok(count) if count > 0 => {
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led.set_low().ok(); // Turn on
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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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let mut write_offset = 0;
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while write_offset < count {
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match serial.write(&buf[write_offset..count]) {
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Ok(len) if len > 0 => {
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write_offset += len;
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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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led.set_high().ok(); // Turn off
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}
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}
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