123 lines
3.8 KiB
C
123 lines
3.8 KiB
C
/**
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******************************************************************************
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* @file ff_gen_drv.c
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* @author MCD Application Team
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* @brief FatFs generic low level driver.
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*****************************************************************************
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* @attention
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*
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* Copyright (c) 2017 STMicroelectronics. All rights reserved.
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*
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* This software component is licensed by ST under BSD 3-Clause license,
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* the "License"; You may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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* opensource.org/licenses/BSD-3-Clause
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*
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******************************************************************************
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**/
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/* Includes ------------------------------------------------------------------*/
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#include "ff_gen_drv.h"
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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Disk_drvTypeDef disk = {{0},{0},{0},0};
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/* Private function prototypes -----------------------------------------------*/
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/* Private functions ---------------------------------------------------------*/
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/**
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* @brief Links a compatible diskio driver/lun id and increments the number of active
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* linked drivers.
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* @note The number of linked drivers (volumes) is up to 10 due to FatFs limits.
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* @param drv: pointer to the disk IO Driver structure
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* @param path: pointer to the logical drive path
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* @param lun : only used for USB Key Disk to add multi-lun management
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else the parameter must be equal to 0
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* @retval Returns 0 in case of success, otherwise 1.
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*/
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uint8_t FATFS_LinkDriverEx(const Diskio_drvTypeDef *drv, char *path, uint8_t lun)
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{
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uint8_t ret = 1;
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uint8_t DiskNum = 0;
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if(disk.nbr < _VOLUMES)
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{
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disk.is_initialized[disk.nbr] = 0;
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disk.drv[disk.nbr] = drv;
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disk.lun[disk.nbr] = lun;
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DiskNum = disk.nbr++;
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path[0] = DiskNum + '0';
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path[1] = ':';
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path[2] = '/';
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path[3] = 0;
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ret = 0;
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}
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return ret;
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}
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/**
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* @brief Links a compatible diskio driver and increments the number of active
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* linked drivers.
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* @note The number of linked drivers (volumes) is up to 10 due to FatFs limits
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* @param drv: pointer to the disk IO Driver structure
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* @param path: pointer to the logical drive path
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* @retval Returns 0 in case of success, otherwise 1.
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*/
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uint8_t FATFS_LinkDriver(const Diskio_drvTypeDef *drv, char *path)
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{
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return FATFS_LinkDriverEx(drv, path, 0);
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}
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/**
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* @brief Unlinks a diskio driver and decrements the number of active linked
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* drivers.
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* @param path: pointer to the logical drive path
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* @param lun : not used
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* @retval Returns 0 in case of success, otherwise 1.
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*/
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uint8_t FATFS_UnLinkDriverEx(char *path, uint8_t lun)
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{
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uint8_t DiskNum = 0;
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uint8_t ret = 1;
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if(disk.nbr >= 1)
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{
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DiskNum = path[0] - '0';
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if(disk.drv[DiskNum] != 0)
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{
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disk.drv[DiskNum] = 0;
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disk.lun[DiskNum] = 0;
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disk.nbr--;
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ret = 0;
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}
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}
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return ret;
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}
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/**
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* @brief Unlinks a diskio driver and decrements the number of active linked
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* drivers.
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* @param path: pointer to the logical drive path
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* @retval Returns 0 in case of success, otherwise 1.
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*/
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uint8_t FATFS_UnLinkDriver(char *path)
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{
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return FATFS_UnLinkDriverEx(path, 0);
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}
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/**
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* @brief Gets number of linked drivers to the FatFs module.
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* @param None
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* @retval Number of attached drivers.
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*/
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uint8_t FATFS_GetAttachedDriversNbr(void)
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{
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return disk.nbr;
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}
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/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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