ff_gen_drv.c

00001 /**
00002   ******************************************************************************
00003   * @file    ff_gen_drv.c 
00004   * @author  MCD Application Team
00005   * @version V1.1.0
00006   * @date    22-April-2014
00007   * @brief   FatFs generic low level driver.
00008   ******************************************************************************
00009   * @attention
00010   *
00011   * <h2><center>&copy; COPYRIGHT 2014 STMicroelectronics</center></h2>
00012   *
00013   * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
00014   * You may not use this file except in compliance with the License.
00015   * You may obtain a copy of the License at:
00016   *
00017   *        http://www.st.com/software_license_agreement_liberty_v2
00018   *
00019   * Unless required by applicable law or agreed to in writing, software 
00020   * distributed under the License is distributed on an "AS IS" BASIS, 
00021   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00022   * See the License for the specific language governing permissions and
00023   * limitations under the License.
00024   *
00025   ******************************************************************************
00026   */ 
00027 
00028 /* Includes ------------------------------------------------------------------*/
00029 #include "ff_gen_drv.h"
00030 
00031 /* Private typedef -----------------------------------------------------------*/
00032 /* Private define ------------------------------------------------------------*/
00033 /* Private variables ---------------------------------------------------------*/
00034 Disk_drvTypeDef  disk = {0};
00035 
00036 /* Private function prototypes -----------------------------------------------*/
00037 /* Private functions ---------------------------------------------------------*/
00038 
00039 /**
00040   * @brief  Links a compatible diskio driver and increments the number of active
00041   *         linked drivers.          
00042   * @note   The number of linked drivers (volumes) is up to 10 due to FatFs limits
00043   * @param  drv: pointer to the disk IO Driver structure
00044   * @param  path: pointer to the logical drive path 
00045   * @retval Returns 0 in case of success, otherwise 1.
00046   */
00047 uint8_t FATFS_LinkDriver(Diskio_drvTypeDef *drv, char *path)
00048 {
00049   uint8_t ret = 1;
00050   uint8_t DiskNum = 0;
00051   if(disk.nbr <= _VOLUMES)
00052   {
00053     disk.is_initialized[disk.nbr] = 0;
00054     disk.drv[disk.nbr] = drv;  
00055     DiskNum = disk.nbr++;
00056     path[0] = DiskNum + '0';
00057     path[1] = ':';
00058     path[2] = '/';
00059     path[3] = 0;
00060     ret = 0;
00061   }
00062   return ret;
00063 }
00064 
00065 /**
00066   * @brief  Unlinks a diskio driver and decrements the number of active linked
00067   *         drivers.
00068   * @param  path: pointer to the logical drive path  
00069   * @retval Returns 0 in case of success, otherwise 1.
00070   */
00071 uint8_t FATFS_UnLinkDriver(char *path)
00072 { 
00073   uint8_t DiskNum = 0;
00074   uint8_t ret = 1;
00075   
00076   if(disk.nbr >= 1)
00077   {    
00078     DiskNum = path[0] - '0';
00079     if(DiskNum <= disk.nbr)
00080     {
00081       disk.drv[disk.nbr--] = 0;
00082       ret = 0;
00083     }
00084   }
00085   
00086   return ret;
00087 }
00088 
00089 /**
00090   * @brief  Gets number of linked drivers to the FatFs module.
00091   * @param  None
00092   * @retval Number of attached drivers.
00093   */
00094 uint8_t FATFS_GetAttachedDriversNbr(void)
00095 {
00096   return disk.nbr;
00097 }
00098  
00099 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
00100