diff --git a/Cargo.lock b/Cargo.lock
index 8e575b4..15316d4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -52,6 +52,21 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "anyhow"
+version = "1.0.95"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34ac096ce696dc2fcabef30516bb13c0a68a11d30131d3df6f04711467681b04"
+
+[[package]]
+name = "array-init"
+version = "0.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23589ecb866b460d3a0f1278834750268c607e8e28a1b982c907219f3178cd72"
+dependencies = [
+ "nodrop",
+]
+
 [[package]]
 name = "clap"
 version = "4.5.27"
@@ -108,8 +123,10 @@ checksum = "a9b537177af81d27b407c2f8d679181f51ce2fe2bf33d38b64efed1d9c6f9749"
 name = "endcap-sl-register-interface-generator"
 version = "0.1.0"
 dependencies = [
+ "anyhow",
  "quick-xml",
  "serde",
+ "serde-hex",
  "xml_schema_generator",
 ]
 
@@ -131,12 +148,24 @@ version = "0.4.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "04cbf5b083de1c7e0222a7a51dbfdba1cbe1c6ab0b15e29fff3f6c077fd9cd9f"
 
+[[package]]
+name = "maybe-uninit"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "60302e4db3a61da70c0cb7991976248362f30319e88850c487b9b95bbf059e00"
+
 [[package]]
 name = "memchr"
 version = "2.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
 
+[[package]]
+name = "nodrop"
+version = "0.1.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72ef4a56884ca558e5ddb05a1d1e7e1bfd9a68d9ed024c21704cc98872dae1bb"
+
 [[package]]
 name = "once_cell"
 version = "1.20.2"
@@ -180,6 +209,17 @@ dependencies = [
  "serde_derive",
 ]
 
+[[package]]
+name = "serde-hex"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ca37e3e4d1b39afd7ff11ee4e947efae85adfddf4841787bfa47c470e96dc26d"
+dependencies = [
+ "array-init",
+ "serde",
+ "smallvec",
+]
+
 [[package]]
 name = "serde_derive"
 version = "1.0.217"
@@ -191,6 +231,15 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "smallvec"
+version = "0.6.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b97fcaeba89edba30f044a10c6a3cc39df9c3f17d7cd829dd1446cab35f890e0"
+dependencies = [
+ "maybe-uninit",
+]
+
 [[package]]
 name = "strsim"
 version = "0.11.1"
diff --git a/Cargo.toml b/Cargo.toml
index 0485f56..3b67e8e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,7 +2,6 @@
 name = "endcap-sl-register-interface-generator"
 version = "0.1.0"
 edition = "2021"
-build = "build.rs"
 
 [[bin]]
 name = "ri-generate"
@@ -11,8 +10,10 @@ path = "src/main.rs"
 [lib]
 
 [dependencies]
+anyhow = "1.0.95"
 quick-xml = { version = "0.37.2", features = ["serialize"] }
 serde = { version = "1.0.217", features = ["derive"] }
+serde-hex = "0.1.0"
 
 [build-dependencies]
 quick-xml = { version = "0.37.2", features = ["serialize"] }
diff --git a/build.rs b/build.rs
deleted file mode 100644
index 277d608..0000000
--- a/build.rs
+++ /dev/null
@@ -1,18 +0,0 @@
-use std::{fs::File, io::BufWriter, io::Write};
-
-use quick_xml::{self, Reader};
-use xml_schema_generator::{self, Options};
-
-const OUTFILEPATH: &str = "src/deserialize.rs";
-
-fn main() {
-    eprintln!("Build script starts");
-    let mut reader = Reader::from_file("./csr.xml").expect("Failed to open xml");
-    let root = xml_schema_generator::into_struct(&mut reader).expect("Failed to parse xml");
-    let struct_as_string = root.to_serde_struct(&Options::quick_xml_de());
-    println!("{}", struct_as_string);
-    let outfile = File::create(OUTFILEPATH).expect("Failed to create out file");
-    let mut writer = BufWriter::new(outfile);
-    writeln!(writer, "use serde::{{Serialize, Deserialize}};").unwrap();
-    writeln!(writer, "{}", struct_as_string).unwrap();
-}
diff --git a/src/deserialize.rs b/src/deserialize.rs
index cbe665e..ec557e0 100644
--- a/src/deserialize.rs
+++ b/src/deserialize.rs
@@ -1,160 +1,8 @@
-use serde::{Serialize, Deserialize};
-#[derive(Serialize, Deserialize)]
-pub struct Module {
-    #[serde(rename = "@name")]
-    pub name: String,
-    #[serde(rename = "@addr")]
-    pub addr: String,
-    #[serde(rename = "@size")]
-    pub size: String,
-    #[serde(rename = "@amod")]
-    pub amod: String,
-    #[serde(rename = "@type")]
-    pub module_type: String,
-    #[serde(rename = "@desc")]
-    pub desc: String,
-    #[serde(rename = "$text")]
-    pub text: Option<String>,
-    pub block: Vec<ModuleBlock>,
+use serde::Deserializer;
+
+pub(crate) fn deserialize_u32<'de, D>(deserializer: D) -> Result<u32, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    todo!()
 }
-
-#[derive(Serialize, Deserialize)]
-pub struct ModuleBlock {
-    #[serde(rename = "@name")]
-    pub name: String,
-    #[serde(rename = "@addr")]
-    pub addr: String,
-    #[serde(rename = "@size")]
-    pub size: String,
-    #[serde(rename = "@decoder")]
-    pub decoder: String,
-    #[serde(rename = "$text")]
-    pub text: Option<String>,
-    pub block: Vec<ModuleBlockBlock>,
-}
-
-#[derive(Serialize, Deserialize)]
-pub struct ModuleBlockBlock {
-    #[serde(rename = "@name")]
-    pub name: String,
-    #[serde(rename = "@addr")]
-    pub addr: String,
-    #[serde(rename = "@size")]
-    pub size: String,
-    #[serde(rename = "@modf")]
-    pub modf: String,
-    #[serde(rename = "$text")]
-    pub text: Option<String>,
-    pub block: Vec<ModuleBlockBlockBlock>,
-    pub register: Vec<ModuleBlockBlockRegister>,
-}
-
-#[derive(Serialize, Deserialize)]
-pub struct ModuleBlockBlockBlock {
-    #[serde(rename = "@name")]
-    pub name: String,
-    #[serde(rename = "@addr")]
-    pub addr: String,
-    #[serde(rename = "@size")]
-    pub size: String,
-    #[serde(rename = "@desc")]
-    pub desc: Option<String>,
-    #[serde(rename = "$text")]
-    pub text: Option<String>,
-    pub register: Vec<ModuleBlockBlockBlockRegister>,
-    pub block: Vec<ModuleBlockBlockBlockBlock>,
-}
-
-#[derive(Serialize, Deserialize)]
-pub struct ModuleBlockBlockBlockRegister {
-    #[serde(rename = "@name")]
-    pub name: String,
-    #[serde(rename = "@addr")]
-    pub addr: String,
-    #[serde(rename = "@mask")]
-    pub mask: Option<String>,
-    #[serde(rename = "@offset")]
-    pub offset: Option<String>,
-    #[serde(rename = "@multiple")]
-    pub multiple: Option<String>,
-    #[serde(rename = "@default")]
-    pub default: Option<String>,
-    #[serde(rename = "$text")]
-    pub text: Option<String>,
-    pub field: Vec<ModuleBlockBlockBlockRegisterField>,
-}
-
-#[derive(Serialize, Deserialize)]
-pub struct ModuleBlockBlockBlockRegisterField {
-    #[serde(rename = "@name")]
-    pub name: String,
-    #[serde(rename = "@mask")]
-    pub mask: String,
-    #[serde(rename = "@offset")]
-    pub offset: Option<String>,
-    #[serde(rename = "@multiple")]
-    pub multiple: Option<String>,
-    #[serde(rename = "@default")]
-    pub default: Option<String>,
-    #[serde(rename = "$text")]
-    pub text: Option<String>,
-    pub value: Vec<Value>,
-}
-
-#[derive(Serialize, Deserialize)]
-pub struct Value {
-    #[serde(rename = "@name")]
-    pub name: String,
-    #[serde(rename = "@data")]
-    pub data: String,
-}
-
-#[derive(Serialize, Deserialize)]
-pub struct ModuleBlockBlockBlockBlock {
-    #[serde(rename = "@name")]
-    pub name: String,
-    #[serde(rename = "$text")]
-    pub text: Option<String>,
-    pub register: Vec<ModuleBlockBlockBlockBlockRegister>,
-}
-
-#[derive(Serialize, Deserialize)]
-pub struct ModuleBlockBlockBlockBlockRegister {
-    #[serde(rename = "@name")]
-    pub name: String,
-    #[serde(rename = "@addr")]
-    pub addr: String,
-    #[serde(rename = "@offset")]
-    pub offset: Option<String>,
-    #[serde(rename = "@multiple")]
-    pub multiple: Option<String>,
-    #[serde(rename = "@mask")]
-    pub mask: Option<String>,
-    #[serde(rename = "$text")]
-    pub text: Option<String>,
-    pub field: Vec<BlockBlockBlockBlockRegisterField>,
-}
-
-#[derive(Serialize, Deserialize)]
-pub struct BlockBlockBlockBlockRegisterField {
-    #[serde(rename = "@name")]
-    pub name: String,
-    #[serde(rename = "@mask")]
-    pub mask: String,
-    #[serde(rename = "@multiple")]
-    pub multiple: Option<String>,
-    #[serde(rename = "@offset")]
-    pub offset: Option<String>,
-}
-
-#[derive(Serialize, Deserialize)]
-pub struct ModuleBlockBlockRegister {
-    #[serde(rename = "@name")]
-    pub name: String,
-    #[serde(rename = "@addr")]
-    pub addr: String,
-    #[serde(rename = "@mask")]
-    pub mask: String,
-}
-
-
diff --git a/src/lib.rs b/src/lib.rs
index 6339d95..54cb2eb 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1 +1,3 @@
-pub mod deserialize;
+// pub mod deserialize;
+pub mod types;
+mod deserialize;
diff --git a/src/main.rs b/src/main.rs
index e7a11a9..5e95b0a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,13 @@
-fn main() {
+use std::{fs::File, io::BufReader};
+
+use endcap_sl_register_interface_generator::types;
+use quick_xml::de::from_reader;
+
+fn main() -> Result<(), anyhow::Error> {
     println!("Hello, world!");
+    let reader = BufReader::new(File::open("./csr.xml").unwrap());
+    let csr_def: types::Module = from_reader(reader)?;
+    println!("Parsed: {:?}", csr_def);
+
+    Ok(())
 }
diff --git a/src/types.rs b/src/types.rs
new file mode 100644
index 0000000..8c52ca3
--- /dev/null
+++ b/src/types.rs
@@ -0,0 +1,87 @@
+use serde::Deserialize;
+use serde_hex::{CompactPfx, SerHex, StrictPfx};
+
+/// Register group.
+#[derive(Debug, Deserialize)]
+pub struct Module {
+    #[serde(rename = "@name")]
+    pub name: String,
+    #[serde(rename = "@addr", with = "SerHex::<CompactPfx>")]
+    pub addr: u32,
+    #[serde(rename = "@size")]
+    pub size: String,
+    #[serde(rename = "@amod")]
+    pub amod: Option<ModuleAmodValue>,
+    #[serde(rename = "@type")]
+    pub r#type: Option<DataType>,
+    #[serde(default)]
+    pub child_bitstring: Vec<BitString>,
+    #[serde(rename = "$value")]
+    pub child_elements: Vec<ModuleElements>,
+}
+
+#[derive(Debug, Deserialize)]
+pub enum ModuleAmodValue {
+    A16,
+    A24,
+    A32,
+    CRCSR,
+    USER1,
+    USER2,
+}
+
+#[derive(Debug, Deserialize)]
+pub enum DataType {
+    /// 32bit data type
+    D32,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct BitString {
+    // TODO
+}
+
+#[derive(Debug, Deserialize)]
+pub struct Block {
+    #[serde(rename = "@name")]
+    pub name: String,
+    #[serde(rename = "@addr")]
+    pub addr: Option<usize>,
+    #[serde(rename = "@type")]
+    pub r#type: Option<DataType>,
+    #[serde(rename = "@modf")]
+    pub modf: Option<RwSpecifier>,
+    #[serde(rename = "@size")]
+    pub size: String,
+    #[serde(rename = "@amod")]
+    pub amod: Option<ModuleAmodValue>,
+    #[serde(default)]
+    pub child_bitstring: Vec<BitString>,
+    #[serde(rename = "$value")]
+    pub child_elements: Vec<ModuleElements>,
+    // TODO
+}
+#[derive(Debug, Deserialize)]
+pub struct Memory {
+    // TODO
+}
+#[derive(Debug, Deserialize)]
+pub struct Register {
+    // TODO
+}
+#[derive(Debug, Deserialize)]
+pub struct Fifo {
+    // TODO
+}
+
+#[derive(Debug, Deserialize)]
+pub enum ModuleElements {
+    #[serde(rename = "block")]
+    Block(Block),
+    Memory(Memory),
+    Register(Register),
+    Fifo(Fifo),
+}
+
+#[derive(Debug, Deserialize)]
+pub enum RwSpecifier {}
diff --git a/tests/parse.rs b/tests/parse.rs
new file mode 100644
index 0000000..c6d4762
--- /dev/null
+++ b/tests/parse.rs
@@ -0,0 +1,11 @@
+use std::{fs::File, io::BufReader};
+
+use endcap_sl_register_interface_generator::{self, types};
+use quick_xml::de::from_reader;
+
+#[test]
+fn test() {
+    let reader = BufReader::new(File::open("./csr.xml").unwrap());
+    let csr_def: types::Module = from_reader(reader).unwrap();
+    println!("Parsed: {:?}", csr_def);
+}