diff --git a/code/base/base.h b/code/base/base.h
new file mode 100644
index 0000000..36ca77c
--- /dev/null
+++ b/code/base/base.h
@@ -0,0 +1,131 @@
+#pragma once
+
+
+class ref
+{
+	volatile long ref_;
+public:
+	ref() : ref_(1)
+	{}
+
+protected:
+	virtual ~ref()
+	{}
+
+public:
+	long add_ref(void)
+	{
+		return _InterlockedIncrement(&ref_);
+	}
+	long release(void)
+	{
+		long r = _InterlockedDecrement(&ref_);
+
+		if (r == 0)
+			delete this;
+
+		return r;
+	}
+};
+
+class parameter : public ref
+{
+public:
+	parameter()
+	{}
+
+protected:
+	virtual ~parameter()
+	{}
+
+public:
+	virtual size_t get_size(void) = 0;
+	virtual void* get_data(void) = 0;		// return data pointer, bool*, int*, double*, (wchar_t*)
+};
+
+
+class ui_helper : public ref
+{
+public:
+	ui_helper()
+	{}
+protected:
+	virtual ~ui_helper()
+	{}
+
+public:
+	enum data_from
+	{
+		DATA_FROM_KNOWN = 0,			// pre-defined data name, i.e. resulotion, paper, bright, ...
+		DATA_FROM_USER,					// need a window for user inputing 
+	};
+	enum value_type
+	{
+		VAL_TYPE_BOOL = 0,
+		VAL_TYPE_INT,
+		VAL_TYPE_FLOAT,
+		VAL_TYPE_STRING,
+		VAL_TYPE_CUSTOM,	// custom data, such as gamma table ...
+	};
+
+	// get testing parameter ...
+	virtual parameter* get_user_input(data_from from, value_type type
+									, const wchar_t* title				// window title when from == DATA_FROM_USER, or parameter name when from == DATA_FROM_KNOWN
+									, const wchar_t* desc = NULL		// description of the parameter if from was DATA_FROM_USER, unused in DATA_FROM_KNOWN
+									) = 0;
+
+	enum test_event
+	{
+		TEST_EVENT_TIPS = 0,			// messages in testing process, data is (wchar_t*), flag is unused
+		TEST_EVENT_xxx,					// should be complemented ...
+		TEST_EVENT_RESULT,				// test result, data is (wchar_t*)description, flag is (bool)result, true - test pass
+	};
+	virtual void test_callback(const wchar_t* name/*test name*/, test_event ev, void* data, size_t flag) = 0;
+
+	enum usb_io_type
+	{
+		USB_IO_BULK_READ = 0,
+		USB_IO_BULK_WRITE,
+		USB_IO_INTERRUPT_READ,
+		USB_IO_INTERRUPT_WRITE,
+	};
+	virtual int io_bulk_int(usb_io_type type, void* buf, size_t* len/*[in]-size of buf, [out]-data bytes in buf*/);
+	virtual int io_control(int type, int req, int val, int ind, void* buf, size_t* len/*[in]-in data sizef, [out]-transferred bytes*/);
+};
+
+#ifdef TEST_DLL
+#define DECL_API(ret)	__declspec(dllexport) ret __stdcall
+#else
+#define DECL_API(ret)	__declspec(dllimport) ret __stdcall
+#endif
+
+// Function: initialize module
+DECL_API(int) func_test_init(void*);
+
+// Function:	to get testing function list supported by this module/DLL
+//
+// Parameter:	buf - to receive the list JSON
+//
+//				len - [in] space of 'buf' in words, [out] words copied in buf, or less buffer size in words if return ERROR_INSUFFICIENT_BUFFER
+//
+// Return:		ERROR_SUCCESS - JSON configuration has copied into buf
+//				ERROR_INSUFFICIENT_BUFFER - buffer is too small, and the minium size in words is stored in 'len'
+//				ERROR_INVALID_PARAMETER - NULL for parameter 'len' is not acceptable
+DECL_API(int) func_test_get_list(wchar_t* buf					// to receive the JSON text
+								, size_t* len);					// [in] space of 'buf' in words, [out] words copied in buf, or less buffer size in words if return ERROR_INSUFFICIENT_BUFFER
+
+// Function:	do ONE function test
+//
+// Parameter:	name - function name
+//
+//				oper - test operation, "start", "pause", "resume", "stop", ...
+//
+//				helper - parameter and testing process callback
+//
+// Return:		error code
+DECL_API(int) func_test_go(const wchar_t* name				// test name
+						, const wchar_t* oper				// test oper - "start", "pause", "resume", "stop", ...
+						, ui_helper* helper);
+
+// Function:	uninitialize module
+DECL_API(int) func_test_uninit(void*);
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