diff --git a/CHANGELOG.md b/CHANGELOG.md
index 21d8603..25955d0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,16 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [unreleased]
 
+## [v0.4.2]
+
+### Added
+
+- `port_mux` function to set pin function select manually
+
+### Changed
+
+- Clear TX and RX FIFO in SPI transfer function
+
 ## [v0.4.1]
 
 ### Fixed
diff --git a/Cargo.toml b/Cargo.toml
index 28341dc..41c7005 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "va108xx-hal"
-version = "0.4.1"
+version = "0.4.2"
 authors = ["Robin Mueller <muellerr@irs.uni-stuttgart.de>"]
 edition = "2021"
 description = "HAL for the Vorago VA108xx family of microcontrollers"
diff --git a/src/gpio/dynpins.rs b/src/gpio/dynpins.rs
index 28b7a1f..f3b2122 100644
--- a/src/gpio/dynpins.rs
+++ b/src/gpio/dynpins.rs
@@ -57,14 +57,17 @@
 //! operation, the trait functions will return
 //! [`InvalidPinType`](PinError::InvalidPinType).
 
-use super::pins::{
-    common_reg_if_functions, FilterType, InterruptEdge, InterruptLevel, Pin, PinError, PinId,
-    PinMode, PinState,
+use super::{
+    pins::{
+        common_reg_if_functions, FilterType, InterruptEdge, InterruptLevel, Pin, PinError, PinId,
+        PinMode, PinState,
+    },
+    reg::RegisterInterface,
 };
-use super::reg::RegisterInterface;
 use crate::{
     clock::FilterClkSel,
     pac::{self, IRQSEL, SYSCONFIG},
+    utility::Funsel,
 };
 use embedded_hal::digital::v2::{InputPin, OutputPin, ToggleableOutputPin};
 use paste::paste;
@@ -98,13 +101,7 @@ pub enum DynOutput {
     ReadableOpenDrain,
 }
 
-/// Value-level `enum` for alternate peripheral function configurations
-#[derive(PartialEq, Eq, Clone, Copy)]
-pub enum DynAlternate {
-    Funsel1,
-    Funsel2,
-    Funsel3,
-}
+pub type DynAlternate = Funsel;
 
 //==================================================================================================
 //  DynPinMode
diff --git a/src/gpio/reg.rs b/src/gpio/reg.rs
index 8f94912..6614a34 100644
--- a/src/gpio/reg.rs
+++ b/src/gpio/reg.rs
@@ -60,18 +60,7 @@ impl From<DynPinMode> for ModeFields {
                 }
             }
             Alternate(config) => {
-                use dynpins::DynAlternate::*;
-                match config {
-                    Funsel1 => {
-                        fields.funsel = 1;
-                    }
-                    Funsel2 => {
-                        fields.funsel = 2;
-                    }
-                    Funsel3 => {
-                        fields.funsel = 3;
-                    }
-                }
+                fields.funsel = config as u8;
             }
         }
         fields
diff --git a/src/spi.rs b/src/spi.rs
index 4a95748..821fa2b 100644
--- a/src/spi.rs
+++ b/src/spi.rs
@@ -504,6 +504,16 @@ macro_rules! spi {
                     });
                 }
 
+                #[inline]
+                pub fn clear_tx_fifo(&self) {
+                    self.spi.fifo_clr.write(|w| w.txfifo().set_bit());
+                }
+
+                #[inline]
+                pub fn clear_rx_fifo(&self) {
+                    self.spi.fifo_clr.write(|w| w.rxfifo().set_bit());
+                }
+
                 #[inline]
                 pub fn perid(&self) -> u32 {
                     self.spi.perid.read().bits()
@@ -640,6 +650,9 @@ macro_rules! spi {
                         // FIFO has a depth of 16.
                         const FILL_DEPTH: usize = 12;
 
+                        self.clear_tx_fifo();
+                        self.clear_rx_fifo();
+
                         if self.blockmode {
                             self.spi.ctrl1.modify(|_, w| {
                                 w.mtxpause().set_bit()
diff --git a/src/utility.rs b/src/utility.rs
index 9f91903..edbe74d 100644
--- a/src/utility.rs
+++ b/src/utility.rs
@@ -3,11 +3,25 @@
 //! Some more information about the recommended scrub rates can be found on the
 //! [Vorago White Paper website](https://www.voragotech.com/resources) in the
 //! application note AN1212
-use va108xx::SYSCONFIG;
+use va108xx::{IOCONFIG, SYSCONFIG};
 
 #[derive(PartialEq, Debug)]
 pub enum UtilityError {
     InvalidCounterResetVal,
+    InvalidPin,
+}
+
+#[derive(Debug, Eq, Copy, Clone, PartialEq)]
+pub enum Funsel {
+    Funsel1 = 0b01,
+    Funsel2 = 0b10,
+    Funsel3 = 0b11,
+}
+
+#[derive(Debug, Copy, Clone, PartialEq)]
+pub enum PortSel {
+    PortA,
+    PortB,
 }
 
 #[derive(Copy, Clone, PartialEq)]
@@ -72,3 +86,28 @@ pub fn set_reset_bit(syscfg: &mut SYSCONFIG, periph_sel: PeripheralSelect) {
         .peripheral_reset
         .modify(|r, w| unsafe { w.bits(r.bits() | (1 << periph_sel as u8)) });
 }
+
+/// Can be used to manually manipulate the function select of port pins
+pub fn port_mux(
+    ioconfig: &mut IOCONFIG,
+    port: PortSel,
+    pin: u8,
+    funsel: Funsel,
+) -> Result<(), UtilityError> {
+    match port {
+        PortSel::PortA => {
+            if pin > 31 {
+                return Err(UtilityError::InvalidPin);
+            }
+            ioconfig.porta[pin as usize].modify(|_, w| unsafe { w.funsel().bits(funsel as u8) });
+            Ok(())
+        }
+        PortSel::PortB => {
+            if pin > 23 {
+                return Err(UtilityError::InvalidPin);
+            }
+            ioconfig.portb[pin as usize].modify(|_, w| unsafe { w.funsel().bits(funsel as u8) });
+            Ok(())
+        }
+    }
+}