init basic examples and setup

examples/blinky-basic/src/main.rs

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+#![deny(unsafe_code)]
+#![no_std]
+#![no_main]
+
+use cortex_m_rt::entry;
+use defmt::info;
+use defmt_rtt as _;
+use panic_probe as _;
+use stm32f1xx_hal::{pac, prelude::*};
+
+const ON_MS: u16 = 500;
+const OFF_MS: u16 = 500;
+
+#[entry]
+fn main() -> ! {
+    let dp = pac::Peripherals::take().unwrap();
+    let cp = cortex_m::Peripherals::take().unwrap();
+
+    let mut rcc = dp.RCC.constrain();
+    let mut gpioc = dp.GPIOC.split(&mut rcc);
+
+    // Splitting the GPIO block gives this function ownership of the LED pin.
+    let mut led = gpioc.pc13.into_push_pull_output(&mut gpioc.crh);
+    let mut delay = cp.SYST.delay(&rcc.clocks);
+
+    info!("blinky-basic: PC13 LED is assumed active-low");
+
+    loop {
+        led.set_low();
+        info!("led on");
+        delay.delay_ms(ON_MS);
+
+        led.set_high();
+        info!("led off");
+        delay.delay_ms(OFF_MS);
+    }
+}