diff --git a/critical_context.cpp b/critical_context.cpp
new file mode 100644
index 0000000..607d4ed
--- /dev/null
+++ b/critical_context.cpp
@@ -0,0 +1,8 @@
+#include "critical_context.hpp"
+extern "C" {
+#include "stm32/critical.h"
+}
+using namespace iflytop;
+
+CriticalContext::CriticalContext() { stm32_critical_enter(); }
+CriticalContext::~CriticalContext() { stm32_critical_exit(); }
\ No newline at end of file
diff --git a/critical_context.hpp b/critical_context.hpp
new file mode 100644
index 0000000..bf601f1
--- /dev/null
+++ b/critical_context.hpp
@@ -0,0 +1,13 @@
+#pragma once
+
+namespace iflytop {
+using namespace std;
+
+class CriticalContext {
+ public:
+  CriticalContext();
+  ~CriticalContext();
+};
+#define ZCriticalContext CriticalContext
+
+}  // namespace iflytop
\ No newline at end of file
diff --git a/sdk.hpp b/sdk.hpp
index 4cb73c2..44a17bc 100644
--- a/sdk.hpp
+++ b/sdk.hpp
@@ -7,4 +7,5 @@ extern "C" {
 #include "stm32/stm32.hpp"
 #include "mutex.hpp"
 #include "ticket.hpp"
+#include "critical_context.hpp"
 void sdkinit();
\ No newline at end of file