diff --git a/src/AdvancedADC.cpp b/src/AdvancedADC.cpp
index 1d506c8..df88a18 100644
--- a/src/AdvancedADC.cpp
+++ b/src/AdvancedADC.cpp
@@ -86,6 +86,9 @@ bool AdvancedADC::available() {
 DMABuffer<Sample> &AdvancedADC::read() {
     static DMABuffer<Sample> NULLBUF;
     if (descr != nullptr) {
+        while (!available()) {
+            __WFI();
+        }
         return *descr->pool->dequeue();
     }
     return NULLBUF;
diff --git a/src/AdvancedDAC.cpp b/src/AdvancedDAC.cpp
index fcdd6b6..5f3cf5f 100644
--- a/src/AdvancedDAC.cpp
+++ b/src/AdvancedDAC.cpp
@@ -84,6 +84,9 @@ bool AdvancedDAC::available() {
 DMABuffer<Sample> &AdvancedDAC::dequeue() {
     static DMABuffer<Sample> NULLBUF;
     if (descr != nullptr) {
+        while (!available()) {
+            __WFI();
+        }
         return *descr->pool->allocate();
     }
     return NULLBUF;