diff --git a/Cargo.toml b/Cargo.toml
index 951819f..d6a13fb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,6 +27,7 @@ embedded-hal-async = { version = "1.0.0" }
 maybe-async = { version = "0.2.10" }
 
 [features]
+default = ["is_sync"]
 msb-spi = []
 std = ["serialport"]
 is_sync = ["maybe-async/is_sync"]
@@ -37,7 +38,7 @@ rustdoc-args = ["--cfg", "docsrs"]
 
 [[example]]
 name = "hsu-test-util"
-required-features = ["std"]
+required-features = ["std", "is_sync"]
 
 [dev-dependencies]
 # hsu-test-serialport
diff --git a/src/lib.rs b/src/lib.rs
index dee44d7..b6f78f0 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -31,7 +31,7 @@
 //! # SPI example
 //! ```
 //! # use pn532::doc_test_helper::{NoOpSPI, NoOpTimer};
-//! use pn532::{requests::SAMMode, spi::SPIInterface, Pn532, Request};
+//! use pn532::{requests::SAMMode, spi::{ SPIInterface, NoIRQ}, Pn532, Request};
 //! use pn532::IntoDuration; // trait for `ms()`, your HAL might have its own
 //!
 //! # let spi = NoOpSPI;
@@ -40,7 +40,7 @@
 //! // spi is a struct implementing embedded_hal::spi::SpiDevice
 //! // timer is a struct implementing pn532::CountDown
 //!
-//! let mut pn532: Pn532<_, _, 32> = Pn532::new(SPIInterface { spi }, timer);
+//! let mut pn532: Pn532<_, _, 32> = Pn532::new(SPIInterface { spi, irq: None::<NoIRQ> }, timer);
 //! if let Err(e) = pn532.process(&Request::sam_configuration(SAMMode::Normal, false), 0, 50.ms()){
 //!     println!("Could not initialize PN532: {e:?}")
 //! }
diff --git a/src/spi.rs b/src/spi.rs
index 7c74a6c..e637bb4 100644
--- a/src/spi.rs
+++ b/src/spi.rs
@@ -280,31 +280,34 @@ mod tests {
 
     #[test]
     fn test_spi() {
-        let mut spi = SPIInterface::new(SpiMock::new(&[
-            // write
-            SpiTransaction::transaction_start(),
-            SpiTransaction::write(as_lsb(0x01)),
-            SpiTransaction::write_vec(vec![as_lsb(1), as_lsb(2)]),
-            SpiTransaction::transaction_end(),
-            // wait_ready
-            SpiTransaction::transaction_start(),
-            SpiTransaction::transfer_in_place(
-                vec![as_lsb(0x02), as_lsb(0x00)],
-                vec![as_lsb(0x00), as_lsb(0x00)],
-            ),
-            SpiTransaction::transaction_end(),
-            SpiTransaction::transaction_start(),
-            SpiTransaction::transfer_in_place(
-                vec![as_lsb(0x02), as_lsb(0x00)],
-                vec![as_lsb(0x00), as_lsb(0x01)],
-            ),
-            SpiTransaction::transaction_end(),
-            // read
-            SpiTransaction::transaction_start(),
-            SpiTransaction::write(as_lsb(0x03)),
-            SpiTransaction::read_vec(vec![as_lsb(3), as_lsb(4)]),
-            SpiTransaction::transaction_end(),
-        ]));
+        let mut spi = SPIInterface {
+            spi: SpiMock::new(&[
+                // write
+                SpiTransaction::transaction_start(),
+                SpiTransaction::write(as_lsb(0x01)),
+                SpiTransaction::write_vec(vec![as_lsb(1), as_lsb(2)]),
+                SpiTransaction::transaction_end(),
+                // wait_ready
+                SpiTransaction::transaction_start(),
+                SpiTransaction::transfer_in_place(
+                    vec![as_lsb(0x02), as_lsb(0x00)],
+                    vec![as_lsb(0x00), as_lsb(0x00)],
+                ),
+                SpiTransaction::transaction_end(),
+                SpiTransaction::transaction_start(),
+                SpiTransaction::transfer_in_place(
+                    vec![as_lsb(0x02), as_lsb(0x00)],
+                    vec![as_lsb(0x00), as_lsb(0x01)],
+                ),
+                SpiTransaction::transaction_end(),
+                // read
+                SpiTransaction::transaction_start(),
+                SpiTransaction::write(as_lsb(0x03)),
+                SpiTransaction::read_vec(vec![as_lsb(3), as_lsb(4)]),
+                SpiTransaction::transaction_end(),
+            ]),
+            irq: None::<NoIRQ>,
+        };
 
         spi.write(&mut [1, 2]).unwrap();