examples/stm32h7rs: add i2c example.

examples/stm32h7rs/src/bin/i2c.rs

@@ -0,0 +1,42 @@
+#![no_std]
+#![no_main]
+
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_stm32::i2c::{Error, I2c};
+use embassy_stm32::time::Hertz;
+use embassy_stm32::{bind_interrupts, i2c, peripherals};
+use {defmt_rtt as _, panic_probe as _};
+
+const ADDRESS: u8 = 0x5F;
+const WHOAMI: u8 = 0x0F;
+
+bind_interrupts!(struct Irqs {
+    I2C2_EV => i2c::EventInterruptHandler<peripherals::I2C2>;
+    I2C2_ER => i2c::ErrorInterruptHandler<peripherals::I2C2>;
+});
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    info!("Hello world!");
+    let p = embassy_stm32::init(Default::default());
+
+    let mut i2c = I2c::new(
+        p.I2C2,
+        p.PB10,
+        p.PB11,
+        Irqs,
+        p.GPDMA1_CH4,
+        p.GPDMA1_CH5,
+        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),
+    }
+}