example: add blocking i2c example

examples/py32f030/src/bin/i2c.rs

@@ -0,0 +1,28 @@
+#![no_std]
+#![no_main]
+#![feature(impl_trait_in_assoc_type)]
+
+use defmt::*;
+use embassy_executor::Spawner;
+use py32_hal::i2c::{Error, I2c};
+use py32_hal::time::Hertz;
+use {defmt_rtt as _, panic_probe as _};
+
+const ADDRESS: u8 = 0x5F;
+const WHOAMI: u8 = 0x0F;
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    info!("Hello world!");
+    let p = py32_hal::init(Default::default());
+
+    let mut i2c = I2c::new_blocking(p.I2C1, p.PF1, p.PF0, Hertz(100_000), Default::default());
+
+    let mut data = [0u8; 1];
+
+    match i2c.blocking_write_read(ADDRESS, &[WHOAMI], &mut data) {
+        Ok(()) => info!("Whoami: {}", data[0]),
+        Err(Error::Timeout) => error!("Operation timed out"),
+        Err(e) => error!("I2c Error: {:?}", e),
+    }
+}