embassy-nrf: Add TWIS module

examples/nrf/src/bin/twis.rs

@@ -0,0 +1,45 @@
+//! TWIS example
+
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_nrf::interrupt;
+use embassy_nrf::twis::{self, Command, Twis};
+use {defmt_rtt as _, panic_probe as _};
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let p = embassy_nrf::init(Default::default());
+
+    let irq = interrupt::take!(SPIM0_SPIS0_TWIM0_TWIS0_SPI0_TWI0);
+    let mut config = twis::Config::default();
+    // Set i2c address
+    config.addr0 = 0x55;
+    let mut i2c = Twis::new(p.TWISPI0, irq, p.P0_03, p.P0_04, config);
+
+    info!("Listening...");
+    loop {
+        let mut buf = [0u8; 16];
+        let tx_buf = [1, 2, 3, 4, 5, 6, 7, 8];
+        match i2c.listen(&mut buf).await {
+            Ok(Command::Read) => {
+                info!("Got READ command. Writing back data:\n{:?}\n", tx_buf);
+                if let Err(e) = i2c.write(&tx_buf).await {
+                    error!("{:?}", e);
+                }
+            }
+            Ok(Command::Write(n)) => info!("Got WRITE command with data:\n{:?}\n", buf[..n]),
+            Ok(Command::WriteRead(n)) => {
+                info!("Got WRITE/READ command with data:\n{:?}", buf[..n]);
+                info!("Writing back data:\n{:?}\n", tx_buf);
+                if let Err(e) = i2c.write(&tx_buf).await {
+                    error!("{:?}", e);
+                }
+            }
+            Err(e) => error!("{:?}", e),
+        }
+    }
+}