Enable variant to set board default SPI

STM32/libraries/SPI/src/SPI.cpp

@@ -1,6 +1,13 @@
 #include "SPI.h"
 
-SPIClass SPI(SPI1);
+#include "variant.h"
+
+#if defined(MOSI) || defined(MISO) || defined(SCK)
+	SPIClass SPI(SPI1, MOSI, MISO, SCK);
+#else
+	SPIClass SPI(SPI1);
+#endif
+
 
 void SPIClass::begin() {
 	apb_freq = stm32_apb_clock_freq((void*)spiHandle.Instance);

STM32/libraries/SPI/src/SPI.h

@@ -56,6 +56,13 @@ class SPIClass {
     SPIClass(SPI_TypeDef *instance) {
     	spiHandle.Instance = instance;
     };
+    SPIClass(SPI_TypeDef *instance, uint8_t mosi, uint8_t miso, uint8_t sck) {
+		spiHandle.Instance = instance;
+
+		stm32_set_mosi(mosi);
+		stm32_set_miso(miso);
+		stm32_set_sck(sck);
+	};
 
     void stm32_set_mosi(uint8_t mosi);
     void stm32_set_miso(uint8_t miso);

STM32/variants/BLACK_F407VE/variant.h

@@ -1,6 +1,11 @@
 #ifndef VARIANT_H
 #define VARIANT_H
 
+// SPI board defaults
+#define MOSI PA7
+#define MISO PA6
+#define SCK PA5
+
 enum {
    PA0 ,
    PA1 ,