Add example

examples/unused.rs

@@ -0,0 +1,48 @@
+//! This is not intended to be used on a real system
+#![no_main]
+#![no_std]
+
+#[allow(unused)]
+use panic_halt;
+
+use stm32f0xx_hal as hal;
+
+use crate::hal::gpio::Unused;
+use crate::hal::i2c::I2c;
+use crate::hal::prelude::*;
+use crate::hal::serial::Serial;
+use crate::hal::spi::Spi;
+use crate::hal::spi::{Mode, Phase, Polarity};
+use crate::hal::stm32;
+
+use cortex_m_rt::entry;
+#[entry]
+fn main() -> ! {
+    const MODE: Mode = Mode {
+        polarity: Polarity::IdleHigh,
+        phase: Phase::CaptureOnSecondTransition,
+    };
+
+    if let Some(p) = stm32::Peripherals::take() {
+        let rcc = p.RCC.constrain();
+        let clocks = rcc.cfgr.freeze();
+
+        let _ = Spi::spi1(
+            p.SPI1,
+            (Unused::new(), Unused::new(), Unused::new()),
+            MODE,
+            100_000.hz(),
+            clocks,
+        );
+        let _ = Serial::usart1(
+            p.USART1,
+            (Unused::new(), Unused::new()),
+            115_200.bps(),
+            clocks,
+        );
+        let _ = I2c::i2c1(p.I2C1, (Unused::new(), Unused::new()), 400.khz());
+    }
+    loop {
+        continue;
+    }
+}