Merge pull request #1850 from CBJamo/i2cdev

rp2040: I2cDevice

5 files changed, 675 insertions, 3 deletions

diff --git a/embassy-rp/src/i2c.rs b/embassy-rp/src/i2c.rs
index 7a5ddd325..c358682c5 100644
--- a/embassy-rp/src/i2c.rs
+++ b/embassy-rp/src/i2c.rs
@@ -21,6 +21,8 @@ pub enum AbortReason {
     NoAcknowledge,
     /// The arbitration was lost, e.g. electrical problems with the clock signal
     ArbitrationLoss,
+    /// Transmit ended with data still in fifo
+    TxNotEmpty(u16),
     Other(u32),
 }
 
@@ -52,7 +54,7 @@ impl Default for Config {
     }
 }
 
-const FIFO_SIZE: u8 = 16;
+pub const FIFO_SIZE: u8 = 16;
 
 pub struct I2c<'d, T: Instance, M: Mode> {
     phantom: PhantomData<(&'d mut T, M)>,
@@ -636,6 +638,7 @@ mod eh1 {
                 Self::Abort(AbortReason::NoAcknowledge) => {
                     embedded_hal_1::i2c::ErrorKind::NoAcknowledge(embedded_hal_1::i2c::NoAcknowledgeSource::Address)
                 }
+                Self::Abort(AbortReason::TxNotEmpty(_)) => embedded_hal_1::i2c::ErrorKind::Other,
                 Self::Abort(AbortReason::Other(_)) => embedded_hal_1::i2c::ErrorKind::Other,
                 Self::InvalidReadBufferLength => embedded_hal_1::i2c::ErrorKind::Other,
                 Self::InvalidWriteBufferLength => embedded_hal_1::i2c::ErrorKind::Other,
@@ -738,8 +741,8 @@ mod nightly {
     }
 }
 
-fn i2c_reserved_addr(addr: u16) -> bool {
-    (addr & 0x78) == 0 || (addr & 0x78) == 0x78
+pub fn i2c_reserved_addr(addr: u16) -> bool {
+    ((addr & 0x78) == 0 || (addr & 0x78) == 0x78) && addr != 0
 }
 
 mod sealed {
diff --git a/embassy-rp/src/i2c_slave.rs b/embassy-rp/src/i2c_slave.rs
new file mode 100644
index 000000000..6136d69c6
--- /dev/null
+++ b/embassy-rp/src/i2c_slave.rs
@@ -0,0 +1,338 @@
+use core::future;
+use core::marker::PhantomData;
+use core::task::Poll;
+
+use embassy_hal_internal::into_ref;
+use pac::i2c;
+
+use crate::i2c::{i2c_reserved_addr, AbortReason, Instance, InterruptHandler, SclPin, SdaPin, FIFO_SIZE};
+use crate::interrupt::typelevel::{Binding, Interrupt};
+use crate::{pac, Peripheral};
+
+/// I2C error
+#[derive(Debug)]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
+#[non_exhaustive]
+pub enum Error {
+    /// I2C abort with error
+    Abort(AbortReason),
+    /// User passed in a response buffer that was 0 length
+    InvalidResponseBufferLength,
+}
+
+/// Received command
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
+pub enum Command {
+    /// General Call
+    GeneralCall(usize),
+    /// Read
+    Read,
+    /// Write+read
+    WriteRead(usize),
+    /// Write
+    Write(usize),
+}
+
+/// Possible responses to responding to a read
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
+pub enum ReadStatus {
+    /// Transaction Complete, controller naked our last byte
+    Done,
+    /// Transaction Incomplete, controller trying to read more bytes than were provided
+    NeedMoreBytes,
+    /// Transaction Complere, but controller stopped reading bytes before we ran out
+    LeftoverBytes(u16),
+}
+
+/// Slave Configuration
+#[non_exhaustive]
+#[derive(Copy, Clone)]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
+pub struct Config {
+    /// Target Address
+    pub addr: u16,
+}
+
+impl Default for Config {
+    fn default() -> Self {
+        Self { addr: 0x55 }
+    }
+}
+
+pub struct I2cSlave<'d, T: Instance> {
+    phantom: PhantomData<&'d mut T>,
+}
+
+impl<'d, T: Instance> I2cSlave<'d, T> {
+    pub fn new(
+        _peri: impl Peripheral<P = T> + 'd,
+        scl: impl Peripheral<P = impl SclPin<T>> + 'd,
+        sda: impl Peripheral<P = impl SdaPin<T>> + 'd,
+        _irq: impl Binding<T::Interrupt, InterruptHandler<T>>,
+        config: Config,
+    ) -> Self {
+        into_ref!(_peri, scl, sda);
+
+        assert!(!i2c_reserved_addr(config.addr));
+        assert!(config.addr != 0);
+
+        let p = T::regs();
+
+        let reset = T::reset();
+        crate::reset::reset(reset);
+        crate::reset::unreset_wait(reset);
+
+        p.ic_enable().write(|w| w.set_enable(false));
+
+        p.ic_sar().write(|w| w.set_ic_sar(config.addr));
+        p.ic_con().modify(|w| {
+            w.set_master_mode(false);
+            w.set_ic_slave_disable(false);
+            w.set_tx_empty_ctrl(true);
+        });
+
+        // Set FIFO watermarks to 1 to make things simpler. This is encoded
+        // by a register value of 0. Rx watermark should never change, but Tx watermark will be
+        // adjusted in operation.
+        p.ic_tx_tl().write(|w| w.set_tx_tl(0));
+        p.ic_rx_tl().write(|w| w.set_rx_tl(0));
+
+        // Configure SCL & SDA pins
+        scl.gpio().ctrl().write(|w| w.set_funcsel(3));
+        sda.gpio().ctrl().write(|w| w.set_funcsel(3));
+
+        scl.pad_ctrl().write(|w| {
+            w.set_schmitt(true);
+            w.set_ie(true);
+            w.set_od(false);
+            w.set_pue(true);
+            w.set_pde(false);
+        });
+        sda.pad_ctrl().write(|w| {
+            w.set_schmitt(true);
+            w.set_ie(true);
+            w.set_od(false);
+            w.set_pue(true);
+            w.set_pde(false);
+        });
+
+        // Clear interrupts
+        p.ic_clr_intr().read();
+
+        // Enable I2C block
+        p.ic_enable().write(|w| w.set_enable(true));
+
+        // mask everything initially
+        p.ic_intr_mask().write_value(i2c::regs::IcIntrMask(0));
+        T::Interrupt::unpend();
+        unsafe { T::Interrupt::enable() };
+
+        Self { phantom: PhantomData }
+    }
+
+    /// Calls `f` to check if we are ready or not.
+    /// If not, `g` is called once the waker is set (to eg enable the required interrupts).
+    #[inline(always)]
+    async fn wait_on<F, U, G>(&mut self, mut f: F, mut g: G) -> U
+    where
+        F: FnMut(&mut Self) -> Poll<U>,
+        G: FnMut(&mut Self),
+    {
+        future::poll_fn(|cx| {
+            let r = f(self);
+
+            trace!("intr p: {:013b}", T::regs().ic_raw_intr_stat().read().0);
+
+            if r.is_pending() {
+                T::waker().register(cx.waker());
+                g(self);
+            }
+
+            r
+        })
+        .await
+    }
+
+    #[inline(always)]
+    fn drain_fifo(&mut self, buffer: &mut [u8], offset: usize) -> usize {
+        let p = T::regs();
+        let len = p.ic_rxflr().read().rxflr() as usize;
+        let end = offset + len;
+        for i in offset..end {
+            buffer[i] = p.ic_data_cmd().read().dat();
+        }
+        end
+    }
+
+    #[inline(always)]
+    fn write_to_fifo(&mut self, buffer: &[u8]) {
+        let p = T::regs();
+        for byte in buffer {
+            p.ic_data_cmd().write(|w| w.set_dat(*byte));
+        }
+    }
+
+    /// Wait asynchronously for commands from an I2C master.
+    /// `buffer` is provided in case master does a 'write' and is unused for 'read'.
+    pub async fn listen(&mut self, buffer: &mut [u8]) -> Result<Command, Error> {
+        let p = T::regs();
+
+        p.ic_clr_intr().read();
+        // set rx fifo watermark to 1 byte
+        p.ic_rx_tl().write(|w| w.set_rx_tl(0));
+
+        let mut len = 0;
+        let ret = self
+            .wait_on(
+                |me| {
+                    let stat = p.ic_raw_intr_stat().read();
+                    if p.ic_rxflr().read().rxflr() > 0 {
+                        len = me.drain_fifo(buffer, len);
+                        // we're recieving data, set rx fifo watermark to 12 bytes to reduce interrupt noise
+                        p.ic_rx_tl().write(|w| w.set_rx_tl(11));
+                    }
+
+                    if stat.restart_det() && stat.rd_req() {
+                        Poll::Ready(Ok(Command::WriteRead(len)))
+                    } else if stat.gen_call() && stat.stop_det() && len > 0 {
+                        Poll::Ready(Ok(Command::GeneralCall(len)))
+                    } else if stat.stop_det() {
+                        Poll::Ready(Ok(Command::Write(len)))
+                    } else if stat.rd_req() {
+                        Poll::Ready(Ok(Command::Read))
+                    } else {
+                        Poll::Pending
+                    }
+                },
+                |_me| {
+                    p.ic_intr_mask().modify(|w| {
+                        w.set_m_stop_det(true);
+                        w.set_m_restart_det(true);
+                        w.set_m_gen_call(true);
+                        w.set_m_rd_req(true);
+                        w.set_m_rx_full(true);
+                    });
+                },
+            )
+            .await;
+
+        p.ic_clr_intr().read();
+
+        ret
+    }
+
+    /// Respond to an I2C master READ command, asynchronously.
+    pub async fn respond_to_read(&mut self, buffer: &[u8]) -> Result<ReadStatus, Error> {
+        let p = T::regs();
+
+        if buffer.len() == 0 {
+            return Err(Error::InvalidResponseBufferLength);
+        }
+
+        let mut chunks = buffer.chunks(FIFO_SIZE as usize);
+
+        let ret = self
+            .wait_on(
+                |me| {
+                    if let Err(abort_reason) = me.read_and_clear_abort_reason() {
+                        if let Error::Abort(AbortReason::TxNotEmpty(bytes)) = abort_reason {
+                            return Poll::Ready(Ok(ReadStatus::LeftoverBytes(bytes)));
+                        } else {
+                            return Poll::Ready(Err(abort_reason));
+                        }
+                    }
+
+                    if let Some(chunk) = chunks.next() {
+                        me.write_to_fifo(chunk);
+
+                        Poll::Pending
+                    } else {
+                        let stat = p.ic_raw_intr_stat().read();
+
+                        if stat.rx_done() && stat.stop_det() {
+                            Poll::Ready(Ok(ReadStatus::Done))
+                        } else if stat.rd_req() {
+                            Poll::Ready(Ok(ReadStatus::NeedMoreBytes))
+                        } else {
+                            Poll::Pending
+                        }
+                    }
+                },
+                |_me| {
+                    p.ic_intr_mask().modify(|w| {
+                        w.set_m_stop_det(true);
+                        w.set_m_rx_done(true);
+                        w.set_m_tx_empty(true);
+                        w.set_m_tx_abrt(true);
+                    })
+                },
+            )
+            .await;
+
+        p.ic_clr_intr().read();
+
+        ret
+    }
+
+    /// Respond to reads with the fill byte until the controller stops asking
+    pub async fn respond_till_stop(&mut self, fill: u8) -> Result<(), Error> {
+        loop {
+            match self.respond_to_read(&[fill]).await {
+                Ok(ReadStatus::NeedMoreBytes) => (),
+                Ok(_) => break Ok(()),
+                Err(e) => break Err(e),
+            }
+        }
+    }
+
+    /// Respond to a master read, then fill any remaining read bytes with `fill`
+    pub async fn respond_and_fill(&mut self, buffer: &[u8], fill: u8) -> Result<ReadStatus, Error> {
+        let resp_stat = self.respond_to_read(buffer).await?;
+
+        if resp_stat == ReadStatus::NeedMoreBytes {
+            self.respond_till_stop(fill).await?;
+            Ok(ReadStatus::Done)
+        } else {
+            Ok(resp_stat)
+        }
+    }
+
+    #[inline(always)]
+    fn read_and_clear_abort_reason(&mut self) -> Result<(), Error> {
+        let p = T::regs();
+        let mut abort_reason = p.ic_tx_abrt_source().read();
+
+        // Mask off fifo flush count
+        let tx_flush_cnt = abort_reason.tx_flush_cnt();
+        abort_reason.set_tx_flush_cnt(0);
+
+        // Mask off master_dis
+        abort_reason.set_abrt_master_dis(false);
+
+        if abort_reason.0 != 0 {
+            // Note clearing the abort flag also clears the reason, and this
+            // instance of flag is clear-on-read! Note also the
+            // IC_CLR_TX_ABRT register always reads as 0.
+            p.ic_clr_tx_abrt().read();
+
+            let reason = if abort_reason.abrt_7b_addr_noack()
+                | abort_reason.abrt_10addr1_noack()
+                | abort_reason.abrt_10addr2_noack()
+            {
+                AbortReason::NoAcknowledge
+            } else if abort_reason.arb_lost() {
+                AbortReason::ArbitrationLoss
+            } else if abort_reason.abrt_slvflush_txfifo() {
+                AbortReason::TxNotEmpty(tx_flush_cnt)
+            } else {
+                AbortReason::Other(abort_reason.0)
+            };
+
+            Err(Error::Abort(reason))
+        } else {
+            Ok(())
+        }
+    }
+}
diff --git a/embassy-rp/src/lib.rs b/embassy-rp/src/lib.rs
index 49bd3533e..2a1bca4b9 100644
--- a/embassy-rp/src/lib.rs
+++ b/embassy-rp/src/lib.rs
@@ -16,6 +16,7 @@ pub mod flash;
 mod float;
 pub mod gpio;
 pub mod i2c;
+pub mod i2c_slave;
 pub mod multicore;
 pub mod pwm;
 mod reset;
diff --git a/examples/rp/src/bin/i2c_slave.rs b/examples/rp/src/bin/i2c_slave.rs
new file mode 100644
index 000000000..7de300fb8
--- /dev/null
+++ b/examples/rp/src/bin/i2c_slave.rs
@@ -0,0 +1,118 @@
+//! This example shows how to use the 2040 as an i2c slave.
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_rp::peripherals::{I2C0, I2C1};
+use embassy_rp::{bind_interrupts, i2c, i2c_slave};
+use embassy_time::{Duration, Timer};
+use embedded_hal_async::i2c::I2c;
+use {defmt_rtt as _, panic_probe as _};
+
+bind_interrupts!(struct Irqs {
+    I2C0_IRQ => i2c::InterruptHandler<I2C0>;
+    I2C1_IRQ => i2c::InterruptHandler<I2C1>;
+});
+
+const DEV_ADDR: u8 = 0x42;
+
+#[embassy_executor::task]
+async fn device_task(mut dev: i2c_slave::I2cSlave<'static, I2C1>) -> ! {
+    info!("Device start");
+
+    let mut state = 0;
+
+    loop {
+        let mut buf = [0u8; 128];
+        match dev.listen(&mut buf).await {
+            Ok(i2c_slave::Command::GeneralCall(len)) => info!("Device recieved general call write: {}", buf[..len]),
+            Ok(i2c_slave::Command::Read) => loop {
+                match dev.respond_to_read(&[state]).await {
+                    Ok(x) => match x {
+                        i2c_slave::ReadStatus::Done => break,
+                        i2c_slave::ReadStatus::NeedMoreBytes => (),
+                        i2c_slave::ReadStatus::LeftoverBytes(x) => {
+                            info!("tried to write {} extra bytes", x);
+                            break;
+                        }
+                    },
+                    Err(e) => error!("error while responding {}", e),
+                }
+            },
+            Ok(i2c_slave::Command::Write(len)) => info!("Device recieved write: {}", buf[..len]),
+            Ok(i2c_slave::Command::WriteRead(len)) => {
+                info!("device recieved write read: {:x}", buf[..len]);
+                match buf[0] {
+                    // Set the state
+                    0xC2 => {
+                        state = buf[1];
+                        match dev.respond_and_fill(&[state], 0x00).await {
+                            Ok(read_status) => info!("response read status {}", read_status),
+                            Err(e) => error!("error while responding {}", e),
+                        }
+                    }
+                    // Reset State
+                    0xC8 => {
+                        state = 0;
+                        match dev.respond_and_fill(&[state], 0x00).await {
+                            Ok(read_status) => info!("response read status {}", read_status),
+                            Err(e) => error!("error while responding {}", e),
+                        }
+                    }
+                    x => error!("Invalid Write Read {:x}", x),
+                }
+            }
+            Err(e) => error!("{}", e),
+        }
+    }
+}
+
+#[embassy_executor::task]
+async fn controller_task(mut con: i2c::I2c<'static, I2C0, i2c::Async>) {
+    info!("Controller start");
+
+    loop {
+        let mut resp_buff = [0u8; 2];
+        for i in 0..10 {
+            match con.write_read(DEV_ADDR, &[0xC2, i], &mut resp_buff).await {
+                Ok(_) => info!("write_read response: {}", resp_buff),
+                Err(e) => error!("Error writing {}", e),
+            }
+
+            Timer::after(Duration::from_millis(100)).await;
+        }
+        match con.read(DEV_ADDR, &mut resp_buff).await {
+            Ok(_) => info!("read response: {}", resp_buff),
+            Err(e) => error!("Error writing {}", e),
+        }
+        match con.write_read(DEV_ADDR, &[0xC8], &mut resp_buff).await {
+            Ok(_) => info!("write_read response: {}", resp_buff),
+            Err(e) => error!("Error writing {}", e),
+        }
+        Timer::after(Duration::from_millis(100)).await;
+    }
+}
+
+#[embassy_executor::main]
+async fn main(spawner: Spawner) {
+    let p = embassy_rp::init(Default::default());
+    info!("Hello World!");
+
+    let d_sda = p.PIN_3;
+    let d_scl = p.PIN_2;
+    let mut config = i2c_slave::Config::default();
+    config.addr = DEV_ADDR as u16;
+    let device = i2c_slave::I2cSlave::new(p.I2C1, d_sda, d_scl, Irqs, config);
+
+    unwrap!(spawner.spawn(device_task(device)));
+
+    let c_sda = p.PIN_1;
+    let c_scl = p.PIN_0;
+    let mut config = i2c::Config::default();
+    config.frequency = 5_000;
+    let controller = i2c::I2c::new_async(p.I2C0, c_sda, c_scl, Irqs, config);
+
+    unwrap!(spawner.spawn(controller_task(controller)));
+}
diff --git a/tests/rp/src/bin/i2c.rs b/tests/rp/src/bin/i2c.rs
new file mode 100644
index 000000000..425f2d086
--- /dev/null
+++ b/tests/rp/src/bin/i2c.rs
@@ -0,0 +1,212 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+teleprobe_meta::target!(b"rpi-pico");
+
+use defmt::{assert_eq, info, panic, unwrap};
+use embassy_executor::Executor;
+use embassy_executor::_export::StaticCell;
+use embassy_rp::multicore::{spawn_core1, Stack};
+use embassy_rp::peripherals::{I2C0, I2C1};
+use embassy_rp::{bind_interrupts, i2c, i2c_slave};
+use embedded_hal_1::i2c::Operation;
+use embedded_hal_async::i2c::I2c;
+use {defmt_rtt as _, panic_probe as _, panic_probe as _, panic_probe as _};
+
+static mut CORE1_STACK: Stack<1024> = Stack::new();
+static EXECUTOR0: StaticCell<Executor> = StaticCell::new();
+static EXECUTOR1: StaticCell<Executor> = StaticCell::new();
+
+use crate::i2c::AbortReason;
+
+bind_interrupts!(struct Irqs {
+    I2C0_IRQ => i2c::InterruptHandler<I2C0>;
+    I2C1_IRQ => i2c::InterruptHandler<I2C1>;
+});
+
+const DEV_ADDR: u8 = 0x42;
+
+#[embassy_executor::task]
+async fn device_task(mut dev: i2c_slave::I2cSlave<'static, I2C1>) -> ! {
+    info!("Device start");
+
+    let mut count = 0xD0;
+
+    loop {
+        let mut buf = [0u8; 128];
+        match dev.listen(&mut buf).await {
+            Ok(i2c_slave::Command::GeneralCall(len)) => {
+                assert_eq!(buf[..len], [0xCA, 0x11], "recieving the general call failed");
+                info!("General Call - OK");
+            }
+            Ok(i2c_slave::Command::Read) => {
+                loop {
+                    match dev.respond_to_read(&[count]).await {
+                        Ok(x) => match x {
+                            i2c_slave::ReadStatus::Done => break,
+                            i2c_slave::ReadStatus::NeedMoreBytes => count += 1,
+                            i2c_slave::ReadStatus::LeftoverBytes(x) => {
+                                info!("tried to write {} extra bytes", x);
+                                break;
+                            }
+                        },
+                        Err(e) => match e {
+                            embassy_rp::i2c_slave::Error::Abort(AbortReason::Other(n)) => panic!("Other {:b}", n),
+                            _ => panic!("{}", e),
+                        },
+                    }
+                }
+                count += 1;
+            }
+            Ok(i2c_slave::Command::Write(len)) => match len {
+                1 => {
+                    assert_eq!(buf[..len], [0xAA], "recieving a single byte failed");
+                    info!("Single Byte Write - OK")
+                }
+                4 => {
+                    assert_eq!(buf[..len], [0xAA, 0xBB, 0xCC, 0xDD], "recieving 4 bytes failed");
+                    info!("4 Byte Write - OK")
+                }
+                32 => {
+                    assert_eq!(
+                        buf[..len],
+                        [
+                            0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
+                            25, 26, 27, 28, 29, 30, 31
+                        ],
+                        "recieving 32 bytes failed"
+                    );
+                    info!("32 Byte Write - OK")
+                }
+                _ => panic!("Invalid write length {}", len),
+            },
+            Ok(i2c_slave::Command::WriteRead(len)) => {
+                info!("device recieved write read: {:x}", buf[..len]);
+                match buf[0] {
+                    0xC2 => {
+                        let resp_buff = [0xD1, 0xD2, 0xD3, 0xD4];
+                        dev.respond_to_read(&resp_buff).await.unwrap();
+                    }
+                    0xC8 => {
+                        let mut resp_buff = [0u8; 32];
+                        for i in 0..32 {
+                            resp_buff[i] = i as u8;
+                        }
+                        dev.respond_to_read(&resp_buff).await.unwrap();
+                    }
+                    x => panic!("Invalid Write Read {:x}", x),
+                }
+            }
+            Err(e) => match e {
+                embassy_rp::i2c_slave::Error::Abort(AbortReason::Other(n)) => panic!("Other {:b}", n),
+                _ => panic!("{}", e),
+            },
+        }
+    }
+}
+
+#[embassy_executor::task]
+async fn controller_task(mut con: i2c::I2c<'static, I2C0, i2c::Async>) {
+    info!("Device start");
+
+    {
+        let buf = [0xCA, 0x11];
+        con.write(0u16, &buf).await.unwrap();
+        info!("Controler general call write");
+        embassy_futures::yield_now().await;
+    }
+
+    {
+        let mut buf = [0u8];
+        con.read(DEV_ADDR, &mut buf).await.unwrap();
+        assert_eq!(buf, [0xD0], "single byte read failed");
+        info!("single byte read - OK");
+        embassy_futures::yield_now().await;
+    }
+
+    {
+        let mut buf = [0u8; 4];
+        con.read(DEV_ADDR, &mut buf).await.unwrap();
+        assert_eq!(buf, [0xD1, 0xD2, 0xD3, 0xD4], "single byte read failed");
+        info!("4 byte read - OK");
+        embassy_futures::yield_now().await;
+    }
+
+    {
+        let buf = [0xAA];
+        con.write(DEV_ADDR, &buf).await.unwrap();
+        info!("Controler single byte write");
+        embassy_futures::yield_now().await;
+    }
+
+    {
+        let buf = [0xAA, 0xBB, 0xCC, 0xDD];
+        con.write(DEV_ADDR, &buf).await.unwrap();
+        info!("Controler 4 byte write");
+        embassy_futures::yield_now().await;
+    }
+
+    {
+        let mut buf = [0u8; 32];
+        for i in 0..32 {
+            buf[i] = i as u8;
+        }
+        con.write(DEV_ADDR, &buf).await.unwrap();
+        info!("Controler 32 byte write");
+        embassy_futures::yield_now().await;
+    }
+
+    {
+        let mut buf = [0u8; 4];
+        let mut ops = [Operation::Write(&[0xC2]), Operation::Read(&mut buf)];
+        con.transaction(DEV_ADDR, &mut ops).await.unwrap();
+        assert_eq!(buf, [0xD1, 0xD2, 0xD3, 0xD4], "write_read failed");
+        info!("write_read - OK");
+        embassy_futures::yield_now().await;
+    }
+
+    {
+        let mut buf = [0u8; 32];
+        let mut ops = [Operation::Write(&[0xC8]), Operation::Read(&mut buf)];
+        con.transaction(DEV_ADDR, &mut ops).await.unwrap();
+        assert_eq!(
+            buf,
+            [
+                0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27,
+                28, 29, 30, 31
+            ],
+            "write_read of 32 bytes failed"
+        );
+        info!("large write_read - OK")
+    }
+
+    info!("Test OK");
+    cortex_m::asm::bkpt();
+}
+
+#[cortex_m_rt::entry]
+fn main() -> ! {
+    let p = embassy_rp::init(Default::default());
+    info!("Hello World!");
+
+    let d_sda = p.PIN_19;
+    let d_scl = p.PIN_18;
+    let mut config = i2c_slave::Config::default();
+    config.addr = DEV_ADDR as u16;
+    let device = i2c_slave::I2cSlave::new(p.I2C1, d_sda, d_scl, Irqs, config);
+
+    spawn_core1(p.CORE1, unsafe { &mut CORE1_STACK }, move || {
+        let executor1 = EXECUTOR1.init(Executor::new());
+        executor1.run(|spawner| unwrap!(spawner.spawn(device_task(device))));
+    });
+
+    let executor0 = EXECUTOR0.init(Executor::new());
+
+    let c_sda = p.PIN_21;
+    let c_scl = p.PIN_20;
+    let mut config = i2c::Config::default();
+    config.frequency = 5_000;
+    let controller = i2c::I2c::new_async(p.I2C0, c_sda, c_scl, Irqs, config);
+
+    executor0.run(|spawner| unwrap!(spawner.spawn(controller_task(controller))));
+}