diff --git a/Cargo.lock b/Cargo.lock
index 9fbbe91..de1f22f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -810,7 +810,7 @@ dependencies = [
 [[package]]
 name = "stm32h7xx-hal"
 version = "0.9.0"
-source = "git+https://github.com/quartiq/stm32h7xx-hal.git?rev=cca4ecc#cca4ecc3e0cc8cb2f7a9652c4099d50b44977493"
+source = "git+https://github.com/quartiq/stm32h7xx-hal.git?rev=b0b8a93#b0b8a930b2c3bc5fcebc2e905b4c5e13360111a5"
 dependencies = [
  "bare-metal 1.0.0",
  "cast",
diff --git a/Cargo.toml b/Cargo.toml
index 93eaa9a..99b390e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -52,11 +52,12 @@ mcp23017 = "1.0"
 git = "https://github.com/quartiq/rtt-logger.git"
 rev = "70b0eb5"
 
+# fast double buffered DMA without poisoning and buffer swapping
 [dependencies.stm32h7xx-hal]
 features = ["stm32h743v", "rt", "unproven", "ethernet", "quadspi"]
 # version = "0.9.0"
 git = "https://github.com/quartiq/stm32h7xx-hal.git"
-rev = "cca4ecc"
+rev = "b0b8a93"
 
 # link.x section start/end
 [patch.crates-io.cortex-m-rt]
diff --git a/src/bin/dual-iir.rs b/src/bin/dual-iir.rs
index a45d603..ab965ee 100644
--- a/src/bin/dual-iir.rs
+++ b/src/bin/dual-iir.rs
@@ -54,10 +54,10 @@ impl Default for Settings {
 
 macro_rules! flatten_closures {
     ($fn:ident, $e:ident, $fun:block) => {
-        $e.$fn(|$e| $fun )
+        $e.$fn(|$e| $fun ).unwrap()
     };
     ($fn:ident, $e:ident, $($es:ident),+, $fun:block) => {
-        $e.$fn(|$e| flatten_closures!($fn, $($es),*, $fun))
+        $e.$fn(|$e| flatten_closures!($fn, $($es),*, $fun)).unwrap()
     };
 }
 
diff --git a/src/hardware/adc.rs b/src/hardware/adc.rs
index 101d762..8919479 100644
--- a/src/hardware/adc.rs
+++ b/src/hardware/adc.rs
@@ -74,7 +74,7 @@ use hal::dma::{
     config::Priority,
     dma::{DMAReq, DmaConfig},
     traits::TargetAddress,
-    MemoryToPeripheral, PeripheralToMemory, Transfer,
+    DMAError, MemoryToPeripheral, PeripheralToMemory, Transfer,
 };
 
 /// A type representing an ADC sample.
@@ -359,7 +359,7 @@ macro_rules! adc_input {
                 ///
                 /// NOTE(unsafe): Memory safety and access ordering is not guaranteed
                 /// (see the HAL DMA docs).
-                pub fn with_buffer<F, R>(&mut self, f: F) -> R
+                pub fn with_buffer<F, R>(&mut self, f: F) -> Result<R, DMAError>
                     where
                 F: FnOnce(&mut SampleBuffer) -> R,
                 {
diff --git a/src/hardware/dac.rs b/src/hardware/dac.rs
index 91f8610..013c43a 100644
--- a/src/hardware/dac.rs
+++ b/src/hardware/dac.rs
@@ -58,7 +58,7 @@ use super::timers;
 use hal::dma::{
     dma::{DMAReq, DmaConfig},
     traits::TargetAddress,
-    MemoryToPeripheral, Transfer,
+    DMAError, MemoryToPeripheral, Transfer,
 };
 
 // The following global buffers are used for the DAC code DMA transfers. Two buffers are used for
@@ -209,7 +209,7 @@ macro_rules! dac_output {
             ///
             /// NOTE(unsafe): Memory safety and access ordering is not guaranteed
             /// (see the HAL DMA docs).
-            pub fn with_buffer<F, R>(&mut self, f: F) -> R
+            pub fn with_buffer<F, R>(&mut self, f: F) -> Result<R, DMAError>
             where
                 F: FnOnce(&mut SampleBuffer) -> R,
             {
diff --git a/src/hardware/pounder/dds_output.rs b/src/hardware/pounder/dds_output.rs
index e755482..bf7acc0 100644
--- a/src/hardware/pounder/dds_output.rs
+++ b/src/hardware/pounder/dds_output.rs
@@ -52,9 +52,11 @@
 ///! compile-time-known register update sequence needed for the application, the serialization
 ///! process can be done once and then register values can be written into a pre-computed serialized
 ///! buffer to avoid the software overhead of much of the serialization process.
+use log::warn;
+use stm32h7xx_hal as hal;
+
 use super::{hrtimer::HighResTimerE, QspiInterface};
 use ad9959::{Channel, DdsConfig, ProfileSerializer};
-use stm32h7xx_hal as hal;
 
 /// The DDS profile update stream.
 pub struct DdsOutput {
diff --git a/src/net/miniconf_client.rs b/src/net/miniconf_client.rs
index cc838f6..e5f328a 100644
--- a/src/net/miniconf_client.rs
+++ b/src/net/miniconf_client.rs
@@ -11,6 +11,7 @@
 ///! Respones to settings updates are sent without quality-of-service guarantees, so there's no
 ///! guarantee that the requestee will be informed that settings have been applied.
 use heapless::String;
+use log::info;
 
 use super::{MqttMessage, NetworkReference, SettingsResponse, UpdateState};
 use crate::hardware::design_parameters::MQTT_BROKER;