Remove SD core dependencies

STM32SD will be able to handle properly SD detect pin
and FatFs options.

SD_DETECT_PIN pinnumber definition could be added in variant.h
SD_DATATIMEOUT could be redefined in variant.h

Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>

Author: fpistm

variants/DISCO_F746NG/ffconf.h

@@ -48,7 +48,8 @@ const PinName digitalPin[] = {
   PF_6,  //D21/A5
   PI_11, //D22 User btn
   PB_7,  //D23 ST-Link Rx
-  PA_9   //D24 ST-Link Tx
+  PA_9,  //D24 ST-Link Tx
+  PC_13  //D25 SD detect
 };
 
 #ifdef __cplusplus

variants/DISCO_F746NG/sd_conf.h

@@ -59,11 +59,12 @@ enum {
   PI11, //D22 User btn
   PB7,  //D23 ST-Link Rx
   PA9,  //D24 ST-Link Tx
+  PC13, //D25 SD detect
   PEND
 };
 
 // This must be a literal with the same value as PEND
-#define NUM_DIGITAL_PINS        25
+#define NUM_DIGITAL_PINS        26
 // This must be a literal with a value less than or equal to to MAX_ANALOG_INPUTS
 #define NUM_ANALOG_INPUTS       6
 #define NUM_ANALOG_FIRST        16
@@ -89,6 +90,9 @@ enum {
 #define PIN_SERIAL_RX           PB7
 #define PIN_SERIAL_TX           PA9
 
+// SD detect signal
+#define SD_DETECT_PIN           PC13
+
 #ifdef __cplusplus
 } // extern "C"
 #endif

variants/DISCO_F746NG/variant.cpp

@@ -144,6 +144,12 @@ enum {
 //#define PIN_SERIALLP1_RX        x // For LPUART1 RX
 //#define PIN_SERIALLP1_TX        x // For LPUART1 TX
 
+// SD card slot Definitions
+// SD detect signal can be defined if required
+//#define SD_DETECT_PIN           x
+// SD Read/Write timeout, default value defined in STM32SD library
+//#define SD_DATATIMEOUT          x
+
 #ifdef __cplusplus
 } // extern "C"
 #endif