mirror of
https://github.com/STMicroelectronics/STM32CubeF4.git
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179 lines
4.5 KiB
C
179 lines
4.5 KiB
C
/**
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******************************************************************************
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* @file sdram_diskio.c
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* @author MCD Application Team
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* @brief SDRAM Disk I/O driver.
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2017 STMicroelectronics.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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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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#include "sdram_diskio.h"
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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/* Block Size in Bytes */
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#define BLOCK_SIZE 512
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/* Private variables ---------------------------------------------------------*/
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/* Disk status */
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static volatile DSTATUS Stat = STA_NOINIT;
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/* Private function prototypes -----------------------------------------------*/
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DSTATUS SDRAMDISK_initialize (BYTE);
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DSTATUS SDRAMDISK_status (BYTE);
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DRESULT SDRAMDISK_read (BYTE, BYTE*, DWORD, UINT);
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#if _USE_WRITE == 1
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DRESULT SDRAMDISK_write (BYTE, const BYTE*, DWORD, UINT);
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#endif /* _USE_WRITE == 1 */
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#if _USE_IOCTL == 1
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DRESULT SDRAMDISK_ioctl (BYTE, BYTE, void*);
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#endif /* _USE_IOCTL == 1 */
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const Diskio_drvTypeDef SDRAMDISK_Driver =
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{
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SDRAMDISK_initialize,
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SDRAMDISK_status,
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SDRAMDISK_read,
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#if _USE_WRITE
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SDRAMDISK_write,
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#endif /* _USE_WRITE == 1 */
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#if _USE_IOCTL == 1
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SDRAMDISK_ioctl,
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#endif /* _USE_IOCTL == 1 */
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};
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/* Private functions ---------------------------------------------------------*/
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/**
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* @brief Initializes a Drive
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* @param lun : not used
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* @retval DSTATUS: Operation status
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*/
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DSTATUS SDRAMDISK_initialize(BYTE lun)
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{
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Stat = STA_NOINIT;
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/* Configure the SDRAM device */
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if(BSP_SDRAM_Init() == SDRAM_OK)
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{
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Stat &= ~STA_NOINIT;
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}
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return Stat;
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}
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/**
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* @brief Gets Disk Status
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* @param lun : not used
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* @retval DSTATUS: Operation status
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*/
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DSTATUS SDRAMDISK_status(BYTE lun)
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{
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return Stat;
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}
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/**
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* @brief Reads Sector(s)
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* @param lun : not used
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* @param *buff: Data buffer to store read data
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* @param sector: Sector address (LBA)
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* @param count: Number of sectors to read (1..128)
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* @retval DRESULT: Operation result
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*/
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DRESULT SDRAMDISK_read(BYTE lun, BYTE *buff, DWORD sector, UINT count)
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{
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uint32_t *pSrcBuffer = (uint32_t *)buff;
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uint32_t BufferSize = (BLOCK_SIZE * count)/4;
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uint32_t *pSdramAddress = (uint32_t *) (SDRAM_DEVICE_ADDR + (sector * BLOCK_SIZE));
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for(; BufferSize != 0; BufferSize--)
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{
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*pSrcBuffer++ = *(__IO uint32_t *)pSdramAddress++;
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}
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return RES_OK;
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}
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/**
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* @brief Writes Sector(s)
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* @param lun : not used
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* @param *buff: Data to be written
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* @param sector: Sector address (LBA)
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* @param count: Number of sectors to write (1..128)
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* @retval DRESULT: Operation result
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*/
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#if _USE_WRITE == 1
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DRESULT SDRAMDISK_write(BYTE lun, const BYTE *buff, DWORD sector, UINT count)
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{
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uint32_t *pDstBuffer = (uint32_t *)buff;
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uint32_t BufferSize = (BLOCK_SIZE * count)/4;
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uint32_t *pSramAddress = (uint32_t *) (SDRAM_DEVICE_ADDR + (sector * BLOCK_SIZE));
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for(; BufferSize != 0; BufferSize--)
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{
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*(__IO uint32_t *)pSramAddress++ = *pDstBuffer++;
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}
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return RES_OK;
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}
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#endif /* _USE_WRITE == 1 */
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/**
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* @brief I/O control operation
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* @param lun : not used
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* @param cmd: Control code
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* @param *buff: Buffer to send/receive control data
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* @retval DRESULT: Operation result
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*/
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#if _USE_IOCTL == 1
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DRESULT SDRAMDISK_ioctl(BYTE lun, BYTE cmd, void *buff)
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{
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DRESULT res = RES_ERROR;
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if (Stat & STA_NOINIT) return RES_NOTRDY;
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switch (cmd)
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{
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/* Make sure that no pending write process */
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case CTRL_SYNC :
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res = RES_OK;
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break;
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/* Get number of sectors on the disk (DWORD) */
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case GET_SECTOR_COUNT :
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*(DWORD*)buff = SDRAM_DEVICE_SIZE / BLOCK_SIZE;
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res = RES_OK;
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break;
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/* Get R/W sector size (WORD) */
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case GET_SECTOR_SIZE :
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*(WORD*)buff = BLOCK_SIZE;
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res = RES_OK;
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break;
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/* Get erase block size in unit of sector (DWORD) */
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case GET_BLOCK_SIZE :
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*(DWORD*)buff = 1;
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res = RES_OK;
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break;
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default:
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res = RES_PARERR;
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}
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return res;
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}
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#endif /* _USE_IOCTL == 1 */
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