diff --git a/src/main.rs b/src/main.rs
index 6c45033..5ac4e64 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -54,10 +54,9 @@ const HIGH: u16 = 25000;
 /// if your board has a different frequency
 const XTAL_FREQ_HZ: u32 = 12_000_000u32;
 
-fn get_adc_channel_blocking<S, D, const DS: u8, E>(dma: &hal::dma::Channels, spi: &mut rp2040_hal::Spi<S, D, DS>, cs_pin: &dyn embedded_hal::digital::v2::OutputPin<Error = E>) -> u16
+fn get_adc_channel_blocking<BIDI, WORD, E>(dma: &hal::dma::Channels, spi: &mut BIDI, cs_pin: &dyn embedded_hal::digital::v2::OutputPin<Error = E>) -> u16
 where
-    S: hal::spi::State,
-    D: hal::spi::SpiDevice,
+    BIDI: hal::dma::ReadTarget<ReceivedWord = WORD> + hal::dma::WriteTarget<TransmittedWord = WORD>,
     E: core::fmt::Debug
 {
     let mut tx_buf: [u8; 3] = [0x06, 0x40, 0x00];
@@ -67,7 +66,7 @@ where
     cs_pin.set_low().unwrap();
 
     // Use BidirectionalConfig to simultaneously write to spi from tx_buf and read into rx_buf
-    let transfer = bidirectional::Config::new((dma.ch0, dma.ch1), &tx_buf, spi, &rx_buf).start();
+    let transfer = bidirectional::Config::new((dma.ch0, dma.ch1), &tx_buf, spi, &mut rx_buf).start();
     // Wait for both DMA channels to finish
     let ((_ch0, _ch1), tx_buf, _spi, rx_buf) = transfer.wait();
     cs_pin.set_high().unwrap();