Added four lane SDIO SD card support (for BTT SKR 2.0 - only tested w…

…ith a NUCLEO-F446ZE dev board). Issue #123.

Drivers/CMSIS/Device/ST/STM32F4xx/Include/stm32f4xx.h

@@ -8,8 +8,8 @@
   *          is using in the C source code, usually in main.c. This file contains:
   *           - Configuration section that allows to select:
   *              - The STM32F4xx device used in the target application
-  *              - To use or not the peripheral�s drivers in application code(i.e. 
-  *                code will be based on direct access to peripheral�s registers 
+  *              - To use or not the peripheral’s drivers in application code(i.e. 
+  *                code will be based on direct access to peripheral’s registers 
   *                rather than drivers API), this option is controlled by 
   *                "#define USE_HAL_DRIVER"
   *  

Drivers/FATFS/App/fatfs.c

@@ -0,0 +1,38 @@
+/* USER CODE BEGIN Header */
+/**
+  ******************************************************************************
+  * @file   fatfs.c
+  * @brief  Code for fatfs applications
+  ******************************************************************************
+  * @attention
+  *
+  * Copyright (c) 2023 STMicroelectronics.
+  * All rights reserved.
+  *
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
+  *
+  ******************************************************************************
+  */
+/* USER CODE END Header */
+#include "fatfs.h"
+
+uint8_t retSD;    /* Return value for SD */
+char SDPath[4];   /* SD logical drive path */
+FATFS SDFatFS;    /* File system object for SD logical drive */
+FIL SDFile;       /* File object for SD */
+
+/* USER CODE BEGIN Variables */
+
+/* USER CODE END Variables */
+
+void MX_FATFS_Init(void)
+{
+  /*## FatFS: Link the SD driver ###########################*/
+  retSD = FATFS_LinkDriver(&SD_Driver, SDPath);
+
+  /* USER CODE BEGIN Init */
+  /* additional user code for init */
+  /* USER CODE END Init */
+}

Drivers/FATFS/App/fatfs.h

@@ -0,0 +1,47 @@
+/* USER CODE BEGIN Header */
+/**
+  ******************************************************************************
+  * @file   fatfs.h
+  * @brief  Header for fatfs applications
+  ******************************************************************************
+  * @attention
+  *
+  * Copyright (c) 2023 STMicroelectronics.
+  * All rights reserved.
+  *
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
+  *
+  ******************************************************************************
+  */
+/* USER CODE END Header */
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __fatfs_H
+#define __fatfs_H
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+#include "ff.h"
+#include "ff_gen_drv.h"
+#include "sd_diskio.h" /* defines SD_Driver as external */
+
+/* USER CODE BEGIN Includes */
+
+/* USER CODE END Includes */
+
+extern uint8_t retSD; /* Return value for SD */
+extern char SDPath[4]; /* SD logical drive path */
+extern FATFS SDFatFS; /* File system object for SD logical drive */
+extern FIL SDFile; /* File object for SD */
+
+void MX_FATFS_Init(void);
+
+/* USER CODE BEGIN Prototypes */
+
+/* USER CODE END Prototypes */
+#ifdef __cplusplus
+}
+#endif
+#endif /*__fatfs_H */