diff --git a/Cargo.toml b/Cargo.toml
index 3990888..7382304 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,7 +2,7 @@
 authors = ["occheung"]
 edition = "2018"
 readme = "README.md"
-name = "firmware-dev"
+name = "firmware"
 version = "0.1.0"
 
 [dependencies]
@@ -34,7 +34,7 @@ name = "fpga_config"
 
 # this lets you use `cargo fix`!
 [[bin]]
-name = "firmware-dev"
+name = "firmware"
 test = false
 bench = false
 
diff --git a/src/cpld.rs b/src/cpld.rs
deleted file mode 100644
index 6fca3f7..0000000
--- a/src/cpld.rs
+++ /dev/null
@@ -1,151 +0,0 @@
-#![no_std]
-
-use stm32h7xx_hal::{
-	hal::{
-		digital::v2::{
-			InputPin,
-			OutputPin,
-		},
-		blocking::spi::Transfer,
-		spi::FullDuplex,
-	},
-	pac,
-	prelude::*,
-	spi,
-};
-
-use core::cell;
-
-use cortex_m;
-use cortex_m::asm::nop;
-use cortex_m_semihosting::hprintln;
-
-use nb::block;
-use crate::spi_slave::Parts;
-
-
-/*
- *	Enum for structuring error
- */
-#[derive(Debug)]
-pub enum Error<E> {
-	SPI(E),
-	CSError,
-	GetRefMutDataError,
-}
-
-/*
- *	Basic structure for CPLD signal multiplexing
- */
-#[derive(Debug)]
-pub struct CPLDData<SPI, CS0, CS1, CS2> {
-	pub(crate) spi: SPI,
-	pub(crate) chip_select: (CS0, CS1, CS2),
-}
-
-#[derive(Debug)]
-pub struct CPLD<SPI, CS0, CS1, CS2> {
-	pub(crate) data: cell::RefCell<CPLDData<SPI, CS0, CS1, CS2>>,
-}
-
-pub trait SelectChip {
-	type Error;
-	fn select_chip(&mut self, chip: u8) -> Result<(), Self::Error>;
-}
-
-impl<SPI, CS0, CS1, CS2, E> SelectChip for CPLDData<SPI, CS0, CS1, CS2>
-where
-	SPI: Transfer<u8, Error = E>,
-	CS0: OutputPin,
-	CS1: OutputPin,
-	CS2: OutputPin,
-{
-	type Error = Error<E>;
-	fn select_chip(&mut self, chip: u8) -> Result<(), Self::Error> {
-		match chip & (1 << 0) {
-			0 => self.chip_select.0.set_low(),
-			_ => self.chip_select.0.set_high(),
-		}.map_err(|_| Error::CSError)?;
-		match chip & (1 << 1) {
-			0 => self.chip_select.1.set_low(),
-			_ => self.chip_select.1.set_high(),
-		}.map_err(|_| Error::CSError)?;
-		match chip & (1 << 2) {
-			0 => self.chip_select.2.set_low(),
-			_ => self.chip_select.2.set_high(),
-		}.map_err(|_| Error::CSError)?;
-		Ok(())
-	}
-}
-
-pub trait DoOnGetRefMutData<SPI, CS0, CS1, CS2> {
-	fn do_on_get_ref_mut_data<R, E>(
-		&self,
-		f: impl FnOnce(cell::RefMut<CPLDData<SPI, CS0, CS1, CS2>>) -> Result<R, Error<E>>,
-	) -> Result<R, Error<E>>;
-}
-
-impl<SPI, CS0, CS1, CS2> DoOnGetRefMutData<SPI, CS0, CS1, CS2> for CPLD<SPI, CS0, CS1, CS2> {
-	fn do_on_get_ref_mut_data<R, E>(
-		&self,
-		f: impl FnOnce(cell::RefMut<CPLDData<SPI, CS0, CS1, CS2>>) -> Result<R, Error<E>>,
-	) -> Result<R, Error<E>> {
-		let dev = self
-			.data
-			.try_borrow_mut()
-			.map_err(|_| Error::GetRefMutDataError)?;
-		f(dev)
-	}
-}
-
-impl<SPI, CS0, CS1, CS2, E> Transfer<u8> for CPLD<SPI, CS0, CS1, CS2>
-where
-	SPI: Transfer<u8, Error = E>,
-	CS0: OutputPin,
-	CS1: OutputPin,
-	CS2: OutputPin,
-{
-	type Error = Error<E>;
-
-	fn transfer<'w>(&mut self, words: &'w mut [u8]) -> Result<&'w [u8], Self::Error> {
-		self.do_on_get_ref_mut_data(move |mut dev| dev.spi.transfer(words).map_err(Error::SPI))
-	}
-}
-
-impl<SPI, CS0, CS1, CS2, E> CPLD<SPI, CS0, CS1, CS2> where
-	SPI: Transfer<u8, Error = E>,
-	CS0: OutputPin,
-	CS1: OutputPin,
-	CS2: OutputPin,
-{
-	// Constructor for CPLD
-	pub fn new(spi: SPI, chip_select: (CS0, CS1, CS2)) -> Self {
-
-		// Init data
-		let data = CPLDData {
-			spi,
-			chip_select,
-		};
-
-		// Init CPLD
-		CPLD {
-			data: cell::RefCell::new(data),
-		}
-	}
-
-	// Destroy the wrapper, return the CPLD data
-	pub fn destroy(self) -> (SPI, (CS0, CS1, CS2)) {
-		let cpld = self.data.into_inner();
-		(cpld.spi, cpld.chip_select)
-	}
-
-	// Split SPI into chips, wrapped by Parts struct
-	pub fn split<'a>(&'a self) -> Parts<'a, CPLD<SPI, CS0, CS1, CS2>, SPI, CS0, CS1, CS2> {
-		Parts::new(&self)
-	}
-
-	// Select Chip
-	pub fn select_chip(&mut self, channel: u8) -> Result<(), Error<E>> {
-		self.do_on_get_ref_mut_data(|mut dev| dev.select_chip(channel))
-	}
-}
diff --git a/src/lib.rs b/src/lib.rs
index 7392c21..dd52938 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,7 +1,153 @@
 #![no_std]
 
-mod cpld;
-pub use cpld::{CPLDData, CPLD, Error};
+use stm32h7xx_hal::{
+	hal::{
+		digital::v2::{
+			InputPin,
+			OutputPin,
+		},
+		blocking::spi::Transfer,
+		spi::FullDuplex,
+	},
+	pac,
+	prelude::*,
+	spi,
+};
 
-mod spi_slave;
-pub use spi_slave::{SPISlave, Parts};
+use core::cell;
+
+use cortex_m;
+use cortex_m::asm::nop;
+use cortex_m_semihosting::hprintln;
+
+use nb::block;
+
+pub mod spi_slave;
+use crate::spi_slave::{SPISlave, Parts};
+
+
+/*
+ *	Enum for structuring error
+ */
+#[derive(Debug)]
+pub enum Error<E> {
+	SPI(E),
+	CSError,
+	GetRefMutDataError,
+}
+
+/*
+ *	Basic structure for CPLD signal multiplexing
+ */
+#[derive(Debug)]
+pub struct CPLDData<SPI, CS0, CS1, CS2> {
+	pub(crate) spi: SPI,
+	pub(crate) chip_select: (CS0, CS1, CS2),
+}
+
+#[derive(Debug)]
+pub struct CPLD<SPI, CS0, CS1, CS2> {
+	pub(crate) data: cell::RefCell<CPLDData<SPI, CS0, CS1, CS2>>,
+}
+
+pub trait SelectChip {
+	type Error;
+	fn select_chip(&mut self, chip: u8) -> Result<(), Self::Error>;
+}
+
+impl<SPI, CS0, CS1, CS2, E> SelectChip for CPLDData<SPI, CS0, CS1, CS2>
+where
+	SPI: Transfer<u8, Error = E>,
+	CS0: OutputPin,
+	CS1: OutputPin,
+	CS2: OutputPin,
+{
+	type Error = Error<E>;
+	fn select_chip(&mut self, chip: u8) -> Result<(), Self::Error> {
+		match chip & (1 << 0) {
+			0 => self.chip_select.0.set_low(),
+			_ => self.chip_select.0.set_high(),
+		}.map_err(|_| Error::CSError)?;
+		match chip & (1 << 1) {
+			0 => self.chip_select.1.set_low(),
+			_ => self.chip_select.1.set_high(),
+		}.map_err(|_| Error::CSError)?;
+		match chip & (1 << 2) {
+			0 => self.chip_select.2.set_low(),
+			_ => self.chip_select.2.set_high(),
+		}.map_err(|_| Error::CSError)?;
+		Ok(())
+	}
+}
+
+pub trait DoOnGetRefMutData<SPI, CS0, CS1, CS2> {
+	fn do_on_get_ref_mut_data<R, E>(
+		&self,
+		f: impl FnOnce(cell::RefMut<CPLDData<SPI, CS0, CS1, CS2>>) -> Result<R, Error<E>>,
+	) -> Result<R, Error<E>>;
+}
+
+impl<SPI, CS0, CS1, CS2> DoOnGetRefMutData<SPI, CS0, CS1, CS2> for CPLD<SPI, CS0, CS1, CS2> {
+	fn do_on_get_ref_mut_data<R, E>(
+		&self,
+		f: impl FnOnce(cell::RefMut<CPLDData<SPI, CS0, CS1, CS2>>) -> Result<R, Error<E>>,
+	) -> Result<R, Error<E>> {
+		let dev = self
+			.data
+			.try_borrow_mut()
+			.map_err(|_| Error::GetRefMutDataError)?;
+		f(dev)
+	}
+}
+
+impl<SPI, CS0, CS1, CS2, E> Transfer<u8> for CPLD<SPI, CS0, CS1, CS2>
+where
+	SPI: Transfer<u8, Error = E>,
+	CS0: OutputPin,
+	CS1: OutputPin,
+	CS2: OutputPin,
+{
+	type Error = Error<E>;
+
+	fn transfer<'w>(&mut self, words: &'w mut [u8]) -> Result<&'w [u8], Self::Error> {
+		self.do_on_get_ref_mut_data(move |mut dev| dev.spi.transfer(words).map_err(Error::SPI))
+	}
+}
+
+impl<SPI, CS0, CS1, CS2, E> CPLD<SPI, CS0, CS1, CS2> where
+	SPI: Transfer<u8, Error = E>,
+	CS0: OutputPin,
+	CS1: OutputPin,
+	CS2: OutputPin,
+{
+	// Constructor for CPLD
+	pub fn new(spi: SPI, chip_select: (CS0, CS1, CS2)) -> Self {
+
+		// Init data
+		let data = CPLDData {
+			spi,
+			chip_select,
+		};
+
+		// Init CPLD
+		CPLD {
+			data: cell::RefCell::new(data),
+		}
+	}
+
+	// Destroy the wrapper, return the CPLD data
+	pub fn destroy(self) -> (SPI, (CS0, CS1, CS2)) {
+		let cpld = self.data.into_inner();
+		(cpld.spi, cpld.chip_select)
+	}
+
+	// Split SPI into chips, wrapped by Parts struct
+	pub fn split<'a>(&'a self) -> Parts<'a, CPLD<SPI, CS0, CS1, CS2>, SPI, CS0, CS1, CS2> {
+		Parts::new(&self)
+	}
+
+	// Select Chip
+	pub fn select_chip(&mut self, channel: u8) -> Result<(), Error<E>> {
+		self.do_on_get_ref_mut_data(|mut dev| dev.select_chip(channel))
+	}
+}
diff --git a/src/main.rs b/src/main.rs
index b744aac..5eab81d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -17,7 +17,7 @@ use cortex_m_semihosting::hprintln;
 use core::ptr;
 use nb::block;
 
-mod cpld;
+use firmware::CPLD;
 
 #[entry]
 fn main() -> ! {
@@ -73,7 +73,7 @@ fn main() -> ! {
 
 	let mut data :u8 = 0xAD;
 
-	let mut switch = cpld::CPLD::new(spi, (
+	let mut switch = CPLD::new(spi, (
 		gpiob.pb12.into_push_pull_output(),
 		gpioa.pa15.into_push_pull_output(),
 		gpioc.pc7.into_push_pull_output(),
diff --git a/src/spi_slave.rs b/src/spi_slave.rs
index 44baeaf..48e5d78 100644
--- a/src/spi_slave.rs
+++ b/src/spi_slave.rs
@@ -13,7 +13,7 @@ use stm32h7xx_hal::{
 
 use core::marker::PhantomData;
 
-use crate::cpld::{DoOnGetRefMutData, Error, SelectChip};
+use crate::{DoOnGetRefMutData, Error, SelectChip};
 
 pub struct SPISlave<'a, DEV: 'a, SPI, CS0, CS1, CS2> (
 	&'a DEV,