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//! CDC-ACM serial port example using polling in a busy loop.
//! Target board: NUCLEO-F042K6
#![no_std]
#![no_main]
extern crate panic_halt;
use cortex_m_rt::entry;
use stm32f0xx_hal::usb::{Peripheral, UsbBus};
use stm32f0xx_hal::{pac, prelude::*};
use usb_device::prelude::*;
use usbd_serial::{SerialPort, USB_CLASS_CDC};
#[entry]
fn main() -> ! {
let mut dp = pac::Peripherals::take().unwrap();
/* Uncomment the following lines if you have a chip in TSSOP20 (STM32F042F)
or UFQFPN28 (STM32F042G) package
This code enables clock for SYSCFG and remaps USB pins to PA9 and PA10.
*/
//dp.RCC.apb2enr.modify(|_, w| w.syscfgen().set_bit());
//dp.SYSCFG.cfgr1.modify(|_, w| w.pa11_pa12_rmp().remapped());
let mut rcc = dp
.RCC
.configure()
.hsi48()
.enable_crs(dp.CRS)
.sysclk(48.mhz())
.pclk(24.mhz())
.freeze(&mut dp.FLASH);
// Configure the on-board LED (LD3, green)
let gpiob = dp.GPIOB.split(&mut rcc);
let mut led = cortex_m::interrupt::free(|cs| gpiob.pb3.into_push_pull_output(cs));
led.set_low(); // Turn off
let gpioa = dp.GPIOA.split(&mut rcc);
let usb = Peripheral {
usb: dp.USB,
pin_dm: gpioa.pa11,
pin_dp: gpioa.pa12,
};
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_high(); // 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_low(); // Turn off
}
}