diff --git a/.gitignore b/.gitignore
index 265b7f5..98097d7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,2 @@
-/target
+**/target
 .gdb_history
diff --git a/Cargo.lock b/Cargo.lock
index 014b427..f3ace36 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -185,6 +185,13 @@ dependencies = [
  "cortex-m",
 ]
 
+[[package]]
+name = "dsp"
+version = "0.1.0"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "embedded-hal"
 version = "0.2.4"
@@ -457,6 +464,7 @@ dependencies = [
  "cortex-m-log",
  "cortex-m-rt",
  "cortex-m-rtic",
+ "dsp",
  "embedded-hal",
  "enum-iterator",
  "heapless",
diff --git a/Cargo.toml b/Cargo.toml
index a57745e..886f041 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -40,6 +40,7 @@ embedded-hal = "0.2.4"
 nb = "1.0.0"
 asm-delay = "0.9.0"
 enum-iterator = "0.6.0"
+dsp = { path = "dsp", version = "0.1.0" }
 
 [dependencies.mcp23017]
 git = "https://github.com/mrd0ll4r/mcp23017.git"
diff --git a/dsp/Cargo.lock b/dsp/Cargo.lock
new file mode 100644
index 0000000..afad0c4
--- /dev/null
+++ b/dsp/Cargo.lock
@@ -0,0 +1,63 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "dsp"
+version = "0.1.0"
+dependencies = [
+ "serde",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e0704ee1a7e00d7bb417d0770ea303c1bccbabf0ef1667dae92b5967f5f8a71"
+dependencies = [
+ "unicode-xid",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "serde"
+version = "1.0.117"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b88fa983de7720629c9387e9f517353ed404164b1e482c970a90c1a4aaf7dc1a"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_derive"
+version = "1.0.117"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cbd1ae72adb44aab48f325a02444a5fc079349a8d804c1fc922aed3f7454c74e"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.50"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "443b4178719c5a851e1bde36ce12da21d74a0e60b4d982ec3385a933c812f0f6"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
+[[package]]
+name = "unicode-xid"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
diff --git a/dsp/Cargo.toml b/dsp/Cargo.toml
new file mode 100644
index 0000000..a9b7fe5
--- /dev/null
+++ b/dsp/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "dsp"
+version = "0.1.0"
+authors = ["Robert Jördens <rj@quartiq.de>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+serde = { version = "1.0", features = ["derive"], default-features = false }
diff --git a/src/iir.rs b/dsp/src/iir.rs
similarity index 100%
rename from src/iir.rs
rename to dsp/src/iir.rs
diff --git a/dsp/src/lib.rs b/dsp/src/lib.rs
new file mode 100644
index 0000000..3c44bbc
--- /dev/null
+++ b/dsp/src/lib.rs
@@ -0,0 +1,3 @@
+#![no_std]
+
+pub mod iir;
diff --git a/src/main.rs b/src/main.rs
index a7d3d73..4c945e5 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -54,10 +54,11 @@ static mut DES_RING: ethernet::DesRing = ethernet::DesRing::new();
 
 mod afe;
 mod eeprom;
-mod iir;
 mod pounder;
 mod server;
 
+use dsp::iir;
+
 #[cfg(not(feature = "semihosting"))]
 fn init_log() {}