diff --git a/Cargo.lock b/Cargo.lock
index 7dc698b..77cf37a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1028,6 +1028,16 @@ dependencies = [
  "managed",
 ]
 
+[[package]]
+name = "smoltcp-nal"
+version = "0.1.0"
+source = "git+https://github.com/vertigo-designs/smoltcp-nal.git?branch=main#6a656dd78c5f7543475e95c0eaf81def95fc5a10"
+dependencies = [
+ "embedded-nal",
+ "heapless",
+ "smoltcp",
+]
+
 [[package]]
 name = "stabilizer"
 version = "0.4.1"
@@ -1050,7 +1060,7 @@ dependencies = [
  "panic-semihosting",
  "paste",
  "serde",
- "smoltcp",
+ "smoltcp-nal",
  "stm32h7xx-hal",
 ]
 
@@ -1075,7 +1085,7 @@ dependencies = [
 [[package]]
 name = "stm32h7xx-hal"
 version = "0.8.0"
-source = "git+https://github.com/quartiq/stm32h7xx-hal?branch=rs/smoltcp-update#87a650664beab422b33f1e3d842f8d585ab5fdab"
+source = "git+https://github.com/stm32-rs/stm32h7xx-hal?branch=dma#2b8a04caac566a8560f400ddd6503508f78bea77"
 dependencies = [
  "bare-metal 1.0.0",
  "cast",
diff --git a/Cargo.toml b/Cargo.toml
index 26016e1..23aab3a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -52,15 +52,14 @@ branch = "feature/mqtt-interface"
 [dependencies.mcp23017]
 git = "https://github.com/mrd0ll4r/mcp23017.git"
 
-[dependencies.smoltcp]
-version = "0.7"
-features = ["ethernet", "proto-ipv4", "socket-tcp", "proto-ipv6"]
-default-features = false
+[dependencies.smoltcp-nal]
+git = "https://github.com/vertigo-designs/smoltcp-nal.git"
+branch = "main"
 
 [dependencies.stm32h7xx-hal]
 features = ["stm32h743v", "rt", "unproven", "ethernet", "quadspi"]
-git = "https://github.com/quartiq/stm32h7xx-hal"
-branch = "rs/smoltcp-update"
+git = "https://github.com/stm32-rs/stm32h7xx-hal"
+branch = "dma"
 
 [features]
 semihosting = ["panic-semihosting", "cortex-m-log/semihosting"]
diff --git a/src/bin/dual-iir.rs b/src/bin/dual-iir.rs
index e76020a..88dca46 100644
--- a/src/bin/dual-iir.rs
+++ b/src/bin/dual-iir.rs
@@ -27,13 +27,11 @@ const IIR_CASCADE_LENGTH: usize = 1;
 
 #[derive(Debug, Deserialize, StringSet)]
 pub struct Settings {
-    iir: [[iir::IIR; IIR_CASCADE_LENGTH]; 2],
 }
 
 impl Settings {
     pub fn new() -> Self {
         Self {
-            iir: [[iir::IIR::default(); IIR_CASCADE_LENGTH]; 2],
         }
     }
 }
@@ -168,9 +166,9 @@ const APP: () = {
     }
 
     #[task(priority = 1, resources=[mqtt_interface, afes, iir_ch])]
-    fn settings_update(mut c: settings_update::Context) {
-        let settings = &c.resources.mqtt_interface.settings;
-        c.resources.iir_ch.lock(|iir| *iir = settings.iir);
+    fn settings_update(c: settings_update::Context) {
+        let _settings = &c.resources.mqtt_interface.settings;
+        //c.resources.iir_ch.lock(|iir| *iir = settings.iir);
         // TODO: Update AFEs
     }
 
diff --git a/src/bin/lockin-external.rs b/src/bin/lockin-external.rs
index bbe09a3..ffeb849 100644
--- a/src/bin/lockin-external.rs
+++ b/src/bin/lockin-external.rs
@@ -25,15 +25,13 @@ const SCALE: f32 = i16::MAX as _;
 // The number of cascaded IIR biquads per channel. Select 1 or 2!
 const IIR_CASCADE_LENGTH: usize = 1;
 
-#[derive(Debug, Deserialize, StringSet)]
+#[derive(Deserialize, StringSet)]
 pub struct Settings {
-    iir: [[iir::IIR; IIR_CASCADE_LENGTH]; 2],
 }
 
 impl Settings {
     pub fn new() -> Self {
         Self {
-            iir: [[iir::IIR::default(); IIR_CASCADE_LENGTH]; 2],
         }
     }
 }
@@ -228,9 +226,9 @@ const APP: () = {
     }
 
     #[task(priority = 1, resources=[mqtt_interface, afes, iir_ch])]
-    fn settings_update(mut c: settings_update::Context) {
-        let settings = &c.resources.mqtt_interface.settings;
-        c.resources.iir_ch.lock(|iir| *iir = settings.iir);
+    fn settings_update(c: settings_update::Context) {
+        let _settings = &c.resources.mqtt_interface.settings;
+        //c.resources.iir_ch.lock(|iir| *iir = settings.iir);
         // TODO: Update AFEs
     }