diff --git a/funconfig.h b/funconfig.h
index 998cf76..561ab22 100644
--- a/funconfig.h
+++ b/funconfig.h
@@ -1,7 +1,18 @@
+#include <stdint.h>
+
 #ifndef _FUNCONFIG_H
 #define _FUNCONFIG_H
 
-#define CH32V003           1
+#define CH32V003 1
+
+#define NULL ((void *)0)
+
+typedef int8_t i8;
+typedef uint8_t u8;
+typedef int16_t i16;
+typedef uint32_t u32;
+typedef int32_t i32;
+typedef int64_t i64;
+typedef uint64_t u64;
 
 #endif
-