#![deny(unsafe_code)] #![no_std] #![no_main] use panic_halt as _; use nb::block; use cortex_m_rt::entry; use cortex_m_semihosting::hprintln; use embedded_hal::digital::v2::{InputPin, OutputPin}; use stm32f1xx_hal::{pac, prelude::*, timer::Timer}; #[entry] fn main() -> ! { // Get access to the core peripherals from the cortex-m crate let cp = cortex_m::Peripherals::take().unwrap(); // Get access to the device specific peripherals from the peripheral access crate let dp = pac::Peripherals::take().unwrap(); // Take ownership over the raw flash and rcc devices and convert them into the corresponding // HAL structs let mut flash = dp.FLASH.constrain(); let mut rcc = dp.RCC.constrain(); // Freeze the configuration of all the clocks in the system and store the frozen frequencies in // `clocks` let clocks = rcc.cfgr.freeze(&mut flash.acr); // Acquire the GPIOC peripheral let mut gpioc = dp.GPIOC.split(&mut rcc.apb2); let mut pin = gpioc.pc13.into_dynamic(&mut gpioc.crh); // Configure the syst timer to trigger an update every second let mut timer = Timer::syst(cp.SYST, &clocks).start_count_down(1.hz()); // Wait for the timer to trigger an update and change the state of the LED loop { pin.make_floating_input(&mut gpioc.crh); block!(timer.wait()).unwrap(); hprintln!("{}", pin.is_high().unwrap()).unwrap(); pin.make_push_pull_output(&mut gpioc.crh); pin.set_high().unwrap(); block!(timer.wait()).unwrap(); pin.set_low().unwrap(); block!(timer.wait()).unwrap(); } }