diff --git a/src_main/core/piinit.h b/src_main/core/piinit.h
index 5cd0ee2b..efaffc88 100644
--- a/src_main/core/piinit.h
+++ b/src_main/core/piinit.h
@@ -40,9 +40,9 @@ public:
 
 
 class PIInit {
+	friend class __PIInit_Initializer__;
 	friend class PIFile;
 public:
-	PIInit();
 	~PIInit();
 
 	//! \brief Build options which PIP library was built
@@ -61,6 +61,7 @@ public:
 	static bool isBuildOptionEnabled(BuildOption o);
 	static PIStringList buildOptions();
 private:
+	explicit PIInit();
 	void setFileCharset(const char *charset);
 	bool fileExists(const PIString & p);
 	PRIVATE_DECLARATION
diff --git a/src_main/io/pispi.h b/src_main/io/pispi.h
index 005f1833..62349c87 100644
--- a/src_main/io/pispi.h
+++ b/src_main/io/pispi.h
@@ -8,9 +8,16 @@ class PIP_EXPORT PISPI: public PIIODevice
 {
 	PIIODEVICE(PISPI)
 public:
-	explicit PISPI(const PIString & path = PIString(), uint speed_hz = 100000, PIIODevice::DeviceMode mode = PIIODevice::ReadWrite);
+	explicit PISPI(const PIString & path = PIString(), uint speed_hz = 1000000, PIIODevice::DeviceMode mode = PIIODevice::ReadWrite);
 	~PISPI() {}
 
+	//! \brief Parameters of PISPI
+	enum Parameters {
+		ClockInverse /*! SPI clk polarity control check and generate */ = 0x1,
+		ParityOdd /*! Parity is odd instead of even */ = 0x2,
+		TwoStopBits /*! Two stop bits instead of one */ = 0x4
+	};
+
 	void setSpeed(uint speed_hz);
 	uint speed() const {return spi_speed;}