In the past two days, the FATFS file system of SPI FLASH has finally been completed. Summarizing this process, the following lessons are drawn:
1. First adjust the underlying driver of SPI FALSH and do a good test. Write a program yourself, write and then read it for verification, confirm that the data is OK, and confirm that the entire FLASH is available. The driver was not written well before, and the PAGE and SECTOR were wrong. As a result, some files could only be written in part, and the latter part was incorrect. At first, I thought it was a memory abnormality, and I searched for a long time.
2. The four functions of USER_initialize, USER_status, USER_read, and USER_write in the user_diskio.c file must be written well. The first two functions are nothing, mainly because the latter two functions are prone to errors, or it is easy to cause problems. Because the sector passed in by the USER_read and USER_write functions is the sector (@param sector: Sector address (LBA)), not the sector address. The underlying driver (which I downloaded from the Internet) uses the physical address where the sector is located, and the two should be in a corresponding relationship. Otherwise, there may be situations where you can bind, but cannot read or write.
3. In the USER_ioctl function, the get command is GET_BLOCK_SIZE, which is literally the length of the block, such as 64K, but the number of sectors in the block should be returned.
After paying attention to the above problems, FATFS can be used.
Relevant code:
/**
******************************************************************************
* @file user_diskio.c
* @brief This file includes a diskio driver skeleton to be completed by the user.
******************************************************************************
* This notice applies to any and all portions of this file
* that are not between comment pairs USER CODE BEGIN and
* USER CODE END. Other portions of this file, whether
* inserted by the user or by software development tools
* are owned by their respective copyright owners.
*
* Copyright (c) 2018 STMicroelectronics International N.V.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted, provided that the following conditions are met:
*
* 1. Redistribution of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of STMicroelectronics nor the names of other
* contributors to this software may be used to endorse or promote products
* derived from this software without specific written permission.
* 4. This software, including modifications and/or derivative works of this
* software, must execute solely and exclusively on microcontroller or
* microprocessor devices manufactured by or for STMicroelectronics.
* 5. Redistribution and use of this software other than as permitted under
* this license is void and will automatically terminate your rights under
* this license.
*
* THIS SOFTWARE IS PROVIDED BY STMICROELECTRONICS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS, IMPLIED OR STATUTORY WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE AND NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY
* RIGHTS ARE DISCLAIMED TO THE FULLEST EXTENT PERMITTED BY LAW. IN NO EVENT
* SHALL STMICROELECTRONICS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
******************************************************************************
*/
#ifdef USE_OBSOLETE_USER_CODE_SECTION_0
/*
* Warning: the user section 0 is no more in use (starting from CubeMx version 4.16.0)
* To be suppressed in the future.
* Kept to ensure backward compatibility with previous CubeMx versions when
* migrating projects.
* User code previously added there should be copied in the new user sections before
* the section contents can be deleted.
*/
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
#endif
/* USER CODE BEGIN DECL */
/* Includes ------------------------------------------------------------------*/
#include <string.h>
#include "ff_gen_drv.h"
#include "w25qx.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Disk status */
static volatile DSTATUS Stat = STA_NOINIT;
extern void MX_SPI1_Init(void);
/* USER CODE END DECL */
/* Private function prototypes -----------------------------------------------*/
DSTATUS USER_initialize (BYTE pdrv);
DSTATUS USER_status (BYTE pdrv);
DRESULT USER_read (BYTE pdrv, BYTE *buff, DWORD sector, UINT count);
#if _USE_WRITE == 1
DRESULT USER_write (BYTE pdrv, const BYTE *buff, DWORD sector, UINT count);
#endif /* _USE_WRITE == 1 */
#if _USE_IOCTL == 1
DRESULT USER_ioctl (BYTE pdrv, BYTE cmd, void *buff);
#endif /* _USE_IOCTL == 1 */
Diskio_drvTypeDef USER_Driver =
{
USER_initialize,
USER_status,
USER_read,
#if _USE_WRITE
USER_write,
#endif /* _USE_WRITE == 1 */
#if _USE_IOCTL == 1
USER_ioctl,
#endif /* _USE_IOCTL == 1 */
};
/* Private functions ---------------------------------------------------------*/
/**
* @brief Initializes a Drive
* @param pdrv: Physical drive number (0..)
* @retval DSTATUS: Operation status
*/
DSTATUS USER_initialize (
BYTE pdrv /* Physical drive nmuber to identify the drive */
)
{
switch (pdrv)
{
case 0 :
MX_SPI1_Init(); //Initialize SPI FLASH
return RES_OK;
case 1 :
return RES_OK;
case 2 :
return RES_OK;
case 3 :
return RES_OK;
default:
return STA_NOINIT;
}
}
/**
* @brief Gets Disk Status
* @param pdrv: Physical drive number (0..)
* @retval DSTATUS: Operation status
*/
DSTATUS USER_status (
BYTE pdrv /* Physical drive number to identify the drive */
)
{
switch (pdrv)
{
case 0 :
return RES_OK;
case 1 :
return RES_OK;
case 2 :
return RES_OK;
default:
return STA_NOINIT;
}
}
/**
* @brief Reads Sector(s)
* @param pdrv: Physical drive number (0..)
* @param *buff: Data buffer to store read data
* aramparam sector: Sector address (LBA)
* @param count: Number of sectors to read (1..128)
* @retval DRESULT: Operation result
*/
DRESULT USER_read (
BYTE pdrv, /* Physical drive nmuber to identify the drive */
BYTE *buff, /* Data buffer to store read data */
DWORD sector, /* Sector address in LBA */
UINT count /* Number of sectors to read */
)
{
/* USER CODE HERE */ //HUANGDADAO
UINT i = 0;
for(i = 0; i < count; i ++)
{
BSP_W25Qx_Read_Sector(buff, sector*SECTOR_SIZE);
sector++;
buff+=SECTOR_SIZE;
}
return RES_OK;
}
/**
* @brief Writes Sector(s)
* @param pdrv: Physical drive number (0..)
* @param *buff: Data to be written
* aramparam sector: Sector address (LBA)
* @param count: Number of sectors to write (1..128)
* @retval DRESULT: Operation result
*/
#if _USE_WRITE == 1
DRESULT USER_write (
BYTE pdrv, /* Physical drive nmuber to identify the drive */
const BYTE *buff, /* Data to be written */
DWORD sector, /* Sector address in LBA */
UINT count /* Number of sectors to write */
)
{
/* USER CODE HERE */
UINT i = 0;
for(i = 0; i < count; i ++)
{
BSP_W25Qx_Write_Sector((uint8_t*)buff,sector*SECTOR_SIZE);
sector ++;
buff += SECTOR_SIZE;
}
return RES_OK;
}
#endif /* _USE_WRITE == 1 */
/**
* @brief I/O control operation
* @param pdrv: Physical drive number (0..)
* @param cmd: Control code
* @param *buff: Buffer to send/receive control data
* @retval DRESULT: Operation result
*/
#if _USE_IOCTL == 1
DRESULT USER_ioctl (
BYTE pdrv, /* Physical drive nmuber (0..) */
BYTE cmd, /* Control code */
void *buff /* Buffer to send/receive control data */
)
{
DRESULT res = RES_OK;
switch(cmd)
{
case CTRL_SYNC :
break;
case CTRL_TRIM:
break;
case GET_BLOCK_SIZE:
*(DWORD*)buff = BLOCK_SIZE;
break;
case GET_SECTOR_SIZE:
*(DWORD*)buff = SECTOR_SIZE;
break;
case GET_SECTOR_COUNT:
*(DWORD*)buff = SECTOR_COUNT;
break;
default:
res = RES_PARERR;
break;
}
return res;
}
#endif /* _USE_IOCTL == 1 */
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/