diff --git a/libraries/SPI/src/SPI.cpp b/libraries/SPI/src/SPI.cpp
index 1050ef6..23ae81f 100644
--- a/libraries/SPI/src/SPI.cpp
+++ b/libraries/SPI/src/SPI.cpp
@@ -1,9 +1,11 @@
 #include "SPI.h"
 
-SPIClass SPI(1);
+SPIClass SPI1(1);
 #if SPI_COMMON_QTY > 1
-SPIClass SPI1(0);
+SPIClass SPI0(0);
 #endif
+// default interface
+SPIClass& SPI = DEFAULT_SPI;
 
 static uint8_t reverse_bits(uint8_t byte);
 
diff --git a/libraries/SPI/src/SPI.h b/libraries/SPI/src/SPI.h
index cee0433..c0b9cd5 100644
--- a/libraries/SPI/src/SPI.h
+++ b/libraries/SPI/src/SPI.h
@@ -127,9 +127,11 @@ public:
   void setClockDivider(uint8_t clockDiv);
 };
 
-extern SPIClass SPI;
-#if SPI_COMMON_QTY > 1
 extern SPIClass SPI1;
+#if SPI_COMMON_QTY > 1
+extern SPIClass SPI0;
 #endif
+// default interface
+extern SPIClass& SPI;
 
 #endif
diff --git a/variants/elbear_ace_nano/pins_arduino.h b/variants/elbear_ace_nano/pins_arduino.h
index 847bba2..721ece4 100644
--- a/variants/elbear_ace_nano/pins_arduino.h
+++ b/variants/elbear_ace_nano/pins_arduino.h
@@ -106,6 +106,7 @@ HAL_TIMER32_CHANNEL_IndexTypeDef pwmPinToTimerChannel(uint32_t digPinNumber);
 
 // SPI
 #define SPI_COMMON_QTY  2
+#define DEFAULT_SPI     SPI1
 
 #define PIN_SPI_SS      10
 #define PIN_SPI_MOSI    11
@@ -117,14 +118,14 @@ static const uint8_t MISO = PIN_SPI_MISO;
 static const uint8_t SCK  = PIN_SPI_SCK;
 
 
-#define PIN_SPI1_SS      9
-#define PIN_SPI1_MOSI    5
-#define PIN_SPI1_MISO    3
-#define PIN_SPI1_SCK     6
-static const uint8_t SS1   = PIN_SPI1_SS;
-static const uint8_t MOSI1 = PIN_SPI1_MOSI;
-static const uint8_t MISO1 = PIN_SPI1_MISO;
-static const uint8_t SCK1  = PIN_SPI1_SCK;
+#define PIN_SPI0_SS      9
+#define PIN_SPI0_MOSI    5
+#define PIN_SPI0_MISO    3
+#define PIN_SPI0_SCK     6
+static const uint8_t SS0   = PIN_SPI0_SS;
+static const uint8_t MOSI0 = PIN_SPI0_MOSI;
+static const uint8_t MISO0 = PIN_SPI0_MISO;
+static const uint8_t SCK0  = PIN_SPI0_SCK;
 
 // config SEL_NSS1 to replace D10 to different controller pin,
 // because NSS which is D9/D10 by default is needed to spi 
diff --git a/variants/elbear_ace_uno/pins_arduino.h b/variants/elbear_ace_uno/pins_arduino.h
index 045510c..63c7b31 100644
--- a/variants/elbear_ace_uno/pins_arduino.h
+++ b/variants/elbear_ace_uno/pins_arduino.h
@@ -101,6 +101,7 @@ HAL_TIMER32_CHANNEL_IndexTypeDef pwmPinToTimerChannel(uint32_t digPinNumber);
 
 // SPI
 #define SPI_COMMON_QTY  2
+#define DEFAULT_SPI     SPI1
 
 #define PIN_SPI_SS      10
 #define PIN_SPI_MOSI    11
@@ -111,14 +112,14 @@ static const uint8_t MOSI = PIN_SPI_MOSI;
 static const uint8_t MISO = PIN_SPI_MISO;
 static const uint8_t SCK  = PIN_SPI_SCK;
 
-#define PIN_SPI1_SS      9
-#define PIN_SPI1_MOSI    5
-#define PIN_SPI1_MISO    3
-#define PIN_SPI1_SCK     6
-static const uint8_t SS1   = PIN_SPI1_SS;
-static const uint8_t MOSI1 = PIN_SPI1_MOSI;
-static const uint8_t MISO1 = PIN_SPI1_MISO;
-static const uint8_t SCK1  = PIN_SPI1_SCK;
+#define PIN_SPI0_SS      9
+#define PIN_SPI0_MOSI    5
+#define PIN_SPI0_MISO    3
+#define PIN_SPI0_SCK     6
+static const uint8_t SS1   = PIN_SPI0_SS;
+static const uint8_t MOSI1 = PIN_SPI0_MOSI;
+static const uint8_t MISO1 = PIN_SPI0_MISO;
+static const uint8_t SCK1  = PIN_SPI0_SCK;
 
 // config SEL_NSS1 to replace D10 to different controller pin,
 // because NSS which is D9/D10 by default is needed to spi 
diff --git a/variants/elsomik/pins_arduino.h b/variants/elsomik/pins_arduino.h
index 19afe33..2b9176b 100644
--- a/variants/elsomik/pins_arduino.h
+++ b/variants/elsomik/pins_arduino.h
@@ -131,6 +131,7 @@ HAL_TIMER32_CHANNEL_IndexTypeDef pwmPinToTimerChannel(uint32_t digPinNumber);
 
 // SPI
 #define SPI_COMMON_QTY  2
+#define DEFAULT_SPI     SPI1
 
 #define PIN_SPI_SS      P1_3
 #define PIN_SPI_MOSI    P1_1
@@ -141,14 +142,14 @@ static const uint8_t MOSI = PIN_SPI_MOSI;
 static const uint8_t MISO = PIN_SPI_MISO;
 static const uint8_t SCK  = PIN_SPI_SCK;
 
-#define PIN_SPI1_SS      P0_3
-#define PIN_SPI1_MOSI    P0_1
-#define PIN_SPI1_MISO    P0_0
-#define PIN_SPI1_SCK     P0_2
-static const uint8_t SS1   = PIN_SPI1_SS;
-static const uint8_t MOSI1 = PIN_SPI1_MOSI;
-static const uint8_t MISO1 = PIN_SPI1_MISO;
-static const uint8_t SCK1  = PIN_SPI1_SCK;
+#define PIN_SPI0_SS      P0_3
+#define PIN_SPI0_MOSI    P0_1
+#define PIN_SPI0_MISO    P0_0
+#define PIN_SPI0_SCK     P0_2
+static const uint8_t SS1   = PIN_SPI0_SS;
+static const uint8_t MOSI1 = PIN_SPI0_MOSI;
+static const uint8_t MISO1 = PIN_SPI0_MISO;
+static const uint8_t SCK1  = PIN_SPI0_SCK;
 
 // check if pwm is used on spi pins
 void spi_onBegin(uint8_t spiNum);
diff --git a/variants/start/pins_arduino.h b/variants/start/pins_arduino.h
index 59c310b..7a5fe64 100644
--- a/variants/start/pins_arduino.h
+++ b/variants/start/pins_arduino.h
@@ -144,6 +144,7 @@ HAL_TIMER32_CHANNEL_IndexTypeDef pwmPinToTimerChannel(uint32_t digPinNumber);
 
 // SPI
 #define SPI_COMMON_QTY  2
+#define DEFAULT_SPI     SPI1
 
 #define PIN_SPI_SS      P1_3
 #define PIN_SPI_MOSI    P1_1
@@ -154,14 +155,14 @@ static const uint8_t MOSI = PIN_SPI_MOSI;
 static const uint8_t MISO = PIN_SPI_MISO;
 static const uint8_t SCK  = PIN_SPI_SCK;
 
-#define PIN_SPI1_SS      P0_3
-#define PIN_SPI1_MOSI    P0_1
-#define PIN_SPI1_MISO    P0_0
-#define PIN_SPI1_SCK     P0_2
-static const uint8_t SS1   = PIN_SPI1_SS;
-static const uint8_t MOSI1 = PIN_SPI1_MOSI;
-static const uint8_t MISO1 = PIN_SPI1_MISO;
-static const uint8_t SCK1  = PIN_SPI1_SCK;
+#define PIN_SPI0_SS      P0_3
+#define PIN_SPI0_MOSI    P0_1
+#define PIN_SPI0_MISO    P0_0
+#define PIN_SPI0_SCK     P0_2
+static const uint8_t SS0   = PIN_SPI0_SS;
+static const uint8_t MOSI0 = PIN_SPI0_MOSI;
+static const uint8_t MISO0 = PIN_SPI0_MISO;
+static const uint8_t SCK0  = PIN_SPI0_SCK;
 
 // check if pwm is used on spi pins
 void spi_onBegin(uint8_t spiNum);