FatFs_MultiDrives
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Outline
Includes
#include "ff_gen_drv.h"
#include "sram_diskio.h"
Private define
#define BLOCK_SIZE
Private variables
Stat
Private function prototypes
SRAMDISK_Driver
Private functions
SRAMDISK_initialize(BYTE)
SRAMDISK_status(BYTE)
SRAMDISK_read(BYTE, BYTE *, DWORD, UINT)
SRAMDISK_write(BYTE, const BYTE *, DWORD, UINT)
SRAMDISK_ioctl(BYTE, BYTE, void *)
Files
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SourceVuSTM32 Libraries and SamplesFatFs_MultiDrivesSrc/sram_diskio.c
 
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/** ****************************************************************************** * @file sram_diskio.c * @author MCD Application Team * @brief SRAM Disk I/O driver. ****************************************************************************** * @attention * * Copyright (c) 2017 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. * ****************************************************************************** *//* ... */ /* Includes ------------------------------------------------------------------*/ #include "ff_gen_drv.h" #include "sram_diskio.h" Includes /* Private typedef -----------------------------------------------------------*/ /* Private define ------------------------------------------------------------*/ /* Block Size in Bytes */ #define BLOCK_SIZE 512 Private define /* Private variables ---------------------------------------------------------*/ /* Disk status */ static volatile DSTATUS Stat = STA_NOINIT; Private variables /* Private function prototypes -----------------------------------------------*/ DSTATUS SRAMDISK_initialize (BYTE); DSTATUS SRAMDISK_status (BYTE); DRESULT SRAMDISK_read (BYTE, BYTE*, DWORD, UINT); #if _USE_WRITE == 1 DRESULT SRAMDISK_write (BYTE, const BYTE*, DWORD, UINT); #endif /* _USE_WRITE == 1 */ #if _USE_IOCTL == 1 DRESULT SRAMDISK_ioctl (BYTE, BYTE, void*); #endif /* _USE_IOCTL == 1 */ const Diskio_drvTypeDef SRAMDISK_Driver = { SRAMDISK_initialize, SRAMDISK_status, SRAMDISK_read, #if _USE_WRITE == 1 SRAMDISK_write, #endif /* _USE_WRITE == 1 */ #if _USE_IOCTL == 1 SRAMDISK_ioctl, #endif /* _USE_IOCTL == 1 */ ...}; Private function prototypes /* Private functions ---------------------------------------------------------*/ /** * @brief Initializes a Drive * @param lun : not used * @retval DSTATUS: Operation status *//* ... */ DSTATUS SRAMDISK_initialize(BYTE lun) { Stat = STA_NOINIT; /* Configure the SRAM device */ if(BSP_SRAM_Init() == SRAM_OK) { Stat &= ~STA_NOINIT; }if (BSP_SRAM_Init() == SRAM_OK) { ... } return Stat; }{ ... } /** * @brief Gets Disk Status * @param lun : not used * @retval DSTATUS: Operation status *//* ... */ DSTATUS SRAMDISK_status(BYTE lun) { return Stat; }{ ... } /** * @brief Reads Sector(s) * @param lun : not used * @param *buff: Data buffer to store read data * @param sector: Sector address (LBA) * @param count: Number of sectors to read (1..128) * @retval DRESULT: Operation result *//* ... */ DRESULT SRAMDISK_read(BYTE lun, BYTE *buff, DWORD sector, UINT count) { uint32_t BufferSize = (BLOCK_SIZE * count); uint8_t *pMem = (uint8_t *) (SRAM_DEVICE_ADDR + (sector * BLOCK_SIZE)); for(; BufferSize != 0; BufferSize--) { *buff++ = *(__IO uint8_t *)pMem++; }for (; BufferSize != 0; BufferSize--) { ... } return RES_OK; }{ ... } /** * @brief Writes Sector(s) * @param lun : not used * @param *buff: Data to be written * @param sector: Sector address (LBA) * @param count: Number of sectors to write (1..128) * @retval DRESULT: Operation result *//* ... */ #if _USE_WRITE == 1 DRESULT SRAMDISK_write(BYTE lun, const BYTE *buff, DWORD sector, UINT count) { uint32_t BufferSize = (BLOCK_SIZE * count); uint8_t *pMem = (uint8_t *) (SRAM_DEVICE_ADDR + (sector * BLOCK_SIZE)); for(; BufferSize != 0; BufferSize--) { *(__IO uint8_t *)pMem++ = *buff++; }for (; BufferSize != 0; BufferSize--) { ... } return RES_OK; }{ ... } /* ... */#endif /* _USE_WRITE == 1 */ /** * @brief I/O control operation * @param lun : not used * @param cmd: Control code * @param *buff: Buffer to send/receive control data * @retval DRESULT: Operation result *//* ... */ #if _USE_IOCTL == 1 DRESULT SRAMDISK_ioctl(BYTE lun, BYTE cmd, void *buff) { DRESULT res = RES_ERROR; if (Stat & STA_NOINIT) return RES_NOTRDY; switch (cmd) { /* Make sure that no pending write process */ case CTRL_SYNC : res = RES_OK; break; /* Get number of sectors on the disk (DWORD) */case CTRL_SYNC : case GET_SECTOR_COUNT : *(DWORD*)buff = SRAM_DEVICE_SIZE / BLOCK_SIZE; res = RES_OK; break; /* Get R/W sector size (WORD) */case GET_SECTOR_COUNT : case GET_SECTOR_SIZE : *(WORD*)buff = BLOCK_SIZE; res = RES_OK; break; /* Get erase block size in unit of sector (DWORD) */case GET_SECTOR_SIZE : case GET_BLOCK_SIZE : *(DWORD*)buff = 1; res = RES_OK; break; case GET_BLOCK_SIZE : default: res = RES_PARERR;default }switch (cmd) { ... } return res; }{ ... } /* ... */#endifPrivate functions /* _USE_IOCTL == 1 */
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