revert removing SPI declaration (needed by SdFat lib) + remove unused lines

Author: stevstrong

STM32F4/libraries/SPI/src/SPI.h

@@ -37,6 +37,8 @@
 #ifndef _LIB_SPI_H_
 #define _LIB_SPI_H_
 
+//#define SPI_DMA // enable this to use DMA for SPI transfers
+
 #include <libmaple/libmaple_types.h>
 #include <libmaple/spi.h>
 #include <libmaple/dma.h>
@@ -374,27 +376,12 @@ class SPIClass {
     uint8 recv(void);
 
 private:
-/*
-	static inline void DMA1_CH3_Event() {
-		dma1_ch3_Active = 0;
-//		dma_disable(DMA1, DMA_CH3);
-//		dma_disable(DMA1, DMA_CH2);
-		
-		// To Do. Need to wait for 
-	}
-*/	
 	SPISettings _settings[BOARD_NR_SPI];
 	SPISettings *_currentSetting;
 
 	void updateSettings(void);
-	/*
-	spi_dev *spi_d;
-	uint8_t _SSPin;
-	uint32_t clockDivider;
-	uint8_t dataMode;
-	BitOrder bitOrder;
-	*/
 };
 
+extern SPIClass SPI; // needed bx SdFat(EX) lib
 
 #endif