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/**
******************************************************************************
* @file sram_diskio.c
* @author MCD Application Team
* @version V1.0.0
* @date 18-February-2014
* @brief SRAM Disk I/O driver
******************************************************************************
* @attention
*
* <h2><center>© COPYRIGHT 2014 STMicroelectronics</center></h2>
*
* Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
* You may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.st.com/software_license_agreement_liberty_v2
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include <string.h>
#include "ff_gen_drv.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Block Size in Bytes */
#define BLOCK_SIZE 512
/* Private variables ---------------------------------------------------------*/
/* Disk status */
static volatile DSTATUS Stat = STA_NOINIT;
/* Private function prototypes -----------------------------------------------*/
DSTATUS SRAMDISK_initialize (void);
DSTATUS SRAMDISK_status (void);
DRESULT SRAMDISK_read (BYTE*, DWORD, BYTE);
#if _USE_WRITE == 1
DRESULT SRAMDISK_write (const BYTE*, DWORD, BYTE);
#endif /* _USE_WRITE == 1 */
#if _USE_IOCTL == 1
DRESULT SRAMDISK_ioctl (BYTE, void*);
#endif /* _USE_IOCTL == 1 */
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 functions ---------------------------------------------------------*/
/**
* @brief Initializes a Drive
* @param None
* @retval DSTATUS: Operation status
*/
DSTATUS SRAMDISK_initialize(void)
{
Stat = STA_NOINIT;
/* Configure the SRAM device */
BSP_SRAM_Init();
Stat &= ~STA_NOINIT;
return Stat;
}
/**
* @brief Gets Disk Status
* @param None
* @retval DSTATUS: Operation status
*/
DSTATUS SRAMDISK_status(void)
{
Stat = STA_NOINIT;
Stat &= ~STA_NOINIT;
return Stat;
}
/**
* @brief Reads Sector(s)
* @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 *buff, DWORD sector, BYTE count)
{
uint32_t BufferSize = (BLOCK_SIZE * count);
uint8_t *pSramAddress = (uint8_t *) (SRAM_DEVICE_ADDR + (sector * BLOCK_SIZE));
for(; BufferSize != 0; BufferSize--)
{
*buff++ = *(__IO uint8_t *)pSramAddress++;
}
return RES_OK;
}
/**
* @brief Writes Sector(s)
* @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(const BYTE *buff, DWORD sector, BYTE count)
{
uint32_t BufferSize = (BLOCK_SIZE * count) + count;
uint8_t *pSramAddress = (uint8_t *) (SRAM_DEVICE_ADDR + (sector * BLOCK_SIZE));
for(; BufferSize != 0; BufferSize--)
{
*(__IO uint8_t *)pSramAddress++ = *buff++;
}
return RES_OK;
}
#endif /* _USE_WRITE == 1 */
/**
* @brief I/O control operation
* @param cmd: Control code
* @param *buff: Buffer to send/receive control data
* @retval DRESULT: Operation result
*/
#if _USE_IOCTL == 1
DRESULT SRAMDISK_ioctl(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 GET_SECTOR_COUNT :
*(DWORD*)buff = SRAM_DEVICE_SIZE / BLOCK_SIZE;
res = RES_OK;
break;
/* Get R/W sector size (WORD) */
case GET_SECTOR_SIZE :
*(WORD*)buff = BLOCK_SIZE;
res = RES_OK;
break;
/* Get erase block size in unit of sector (DWORD) */
case GET_BLOCK_SIZE :
*(DWORD*)buff = BLOCK_SIZE;
break;
default:
res = RES_PARERR;
}
return res;
}
#endif /* _USE_IOCTL == 1 */
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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