Add spi, i2c and fix usart

examples/stm32u0/src/bin/i2c.rs

@@ -0,0 +1,21 @@
+#![no_std]
+#![no_main]
+
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_stm32::i2c::I2c;
+use embassy_stm32::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) {
+    let p = embassy_stm32::init(Default::default());
+    let mut i2c = I2c::new_blocking(p.I2C2, p.PB10, p.PB11, Hertz(100_000), Default::default());
+
+    let mut data = [0u8; 1];
+    unwrap!(i2c.blocking_write_read(ADDRESS, &[WHOAMI], &mut data));
+    info!("Whoami: {}", data[0]);
+}

examples/stm32u0/src/bin/spi.rs

@@ -0,0 +1,30 @@
+#![no_std]
+#![no_main]
+
+use defmt::*;
+use embassy_stm32::gpio::{Level, Output, Speed};
+use embassy_stm32::spi::{Config, Spi};
+use embassy_stm32::time::Hertz;
+use {defmt_rtt as _, panic_probe as _};
+
+#[cortex_m_rt::entry]
+fn main() -> ! {
+    info!("Hello World!");
+
+    let p = embassy_stm32::init(Default::default());
+
+    let mut spi_config = Config::default();
+    spi_config.frequency = Hertz(1_000_000);
+
+    let mut spi = Spi::new_blocking(p.SPI3, p.PC10, p.PC12, p.PC11, spi_config);
+
+    let mut cs = Output::new(p.PE0, Level::High, Speed::VeryHigh);
+
+    loop {
+        let mut buf = [0x0Au8; 4];
+        cs.set_low();
+        unwrap!(spi.blocking_transfer_in_place(&mut buf));
+        cs.set_high();
+        info!("xfer {=[u8]:x}", buf);
+    }
+}

examples/stm32u0/src/bin/usart.rs

@@ -2,15 +2,9 @@
 #![no_main]
 
 use defmt::*;
-use embassy_stm32::dma::NoDma;
 use embassy_stm32::usart::{Config, Uart};
-use embassy_stm32::{bind_interrupts, peripherals, usart};
 use {defmt_rtt as _, panic_probe as _};
 
-bind_interrupts!(struct Irqs {
-    USART2_LPUART2 => usart::InterruptHandler<peripherals::USART2>;
-});
-
 #[cortex_m_rt::entry]
 fn main() -> ! {
     info!("Hello World!");
@@ -18,7 +12,7 @@ fn main() -> ! {
     let p = embassy_stm32::init(Default::default());
 
     let config = Config::default();
-    let mut usart = Uart::new(p.USART2, p.PA3, p.PA2, Irqs, NoDma, NoDma, config).unwrap();
+    let mut usart = Uart::new_blocking(p.USART2, p.PA3, p.PA2, config).unwrap();
 
     unwrap!(usart.blocking_write(b"Hello Embassy World!\r\n"));
     info!("wrote Hello, starting echo");