概述
第一次写CSDN，把这两天做的一个小实验记个笔记。写的不好请见谅，有错误欢迎指正，欢迎讨论。在做之前也参考其他博主的一些文章Carry_王的博客
USB基本概念不做介绍，不懂的可以先去了解，主要说明实现过程。
一、硬件
STM32F407 开发板 ，包括外部FLASH w25q128 （16MB）
通过USB数据线连接板子USB SLAVE接口与PC端
二、实现内容
片外FLASH虚拟U盘，利用文件系统对FLASH芯片进行读写操作，同时PC端也可对U盘内文件进行操作。后面测试结果会有详细说明。下面直接上具体操作。
三、CubeMX配置
STM32CubeMX版本6.3.0
1.选择芯片
STM32F407ZGTX
2.RCC和SYS
3.时钟树配置
4.SPI
5.USB_OTG_FS(默认即可）
模式选择 Device_Only
6.FATFS
修改过的地方已经标出，按照图配置即可
7.USB_DEVICE
8.生成代码
四、代码修改
CubeMX创建基础工程生成代码，直接打开。
1.首先添加Flash芯片的驱动文件，直接把我的贴出来，注释比较详细
w25qxx.c
#include "w25qxx.h"
#include "spi.h"
#include "stm32f4xx_hal_gpio.h"
#include "stm32f4xx_hal_def.h"
uint16_t W25QXX_TYPE=W25Q128; //默认是W25Q128
uint8_t SPI1_ReadWriteByte(uint8_t TxData);
//4Kbytes为一个Sector
//16个扇区为1个Block
//W25Q128
//容量为16M字节,共有512个Block,4096个Sector
//初始化SPI FLASH的IO口
HAL_StatusTypeDef W25QXX_Init(void)
{
HAL_StatusTypeDef r = HAL_ERROR;
uint8_t temp;
W25QXX_CS_H(); //SPI FLASH不选中
// MX_SPI1_Init(); //初始化SPI
// SPI1_SetSpeed(SPI_BAUDRATEPRESCALER_4); //设置为21M时钟,高速模式
W25QXX_TYPE=W25QXX_ReadID(); //读取FLASH ID.
if(W25QXX_TYPE==W25Q128) //SPI FLASH为W25Q256
{
temp=W25QXX_ReadSR(3); //读取状态寄存器3，判断地址模式
if((temp&0X01)==0) //如果不是4字节地址模式,则进入4字节地址模式
{
W25QXX_CS_L(); //选中
SPI1_ReadWriteByte(W25X_Enable4ByteAddr);//发送进入4字节地址模式指令
W25QXX_CS_H(); //取消片选
}
r = HAL_OK;;
}
return r;
}
//读取W25QXX的状态寄存器，W25QXX一共有3个状态寄存器
//状态寄存器1：
//BIT7 6 5 4 3 2 1 0
//SPR RV TB BP2 BP1 BP0 WEL BUSY
//SPR:默认0,状态寄存器保护位,配合WP使用
//TB,BP2,BP1,BP0:FLASH区域写保护设置
//WEL:写使能锁定
//BUSY:忙标记位(1,忙;0,空闲)
//默认:0x00
//状态寄存器2：
//BIT7 6 5 4 3 2 1 0
//SUS CMP LB3 LB2 LB1 (R) QE SRP1
//状态寄存器3：
//BIT7 6 5 4 3 2 1 0
//HOLD/RST DRV1 DRV0 (R) (R) WPS ADP ADS
//regno:状态寄存器号，范:1~3
//返回值:状态寄存器值
uint8_t W25QXX_ReadSR(uint8_t regno)
{
uint8_t byte=0,command=0;
switch(regno)
{
case 1:
command=W25X_ReadStatusReg1; //读状态寄存器1指令
break;
case 2:
command=W25X_ReadStatusReg2; //读状态寄存器2指令
break;
case 3:
command=W25X_ReadStatusReg3; //读状态寄存器3指令
break;
default:
command=W25X_ReadStatusReg1;
break;
}
W25QXX_CS_L(); //使能器件
SPI1_ReadWriteByte(command); //发送读取状态寄存器命令
byte=SPI1_ReadWriteByte(0Xff); //读取一个字节
W25QXX_CS_H(); //取消片选
return byte;
}
//写W25QXX状态寄存器
void W25QXX_Write_SR(uint8_t regno,uint8_t sr)
{
uint8_t command=0;
switch(regno)
{
case 1:
command=W25X_WriteStatusReg1; //写状态寄存器1指令
break;
case 2:
command=W25X_WriteStatusReg2; //写状态寄存器2指令
break;
case 3:
command=W25X_WriteStatusReg3; //写状态寄存器3指令
break;
default:
command=W25X_WriteStatusReg1;
break;
}
W25QXX_CS_L(); //使能器件
SPI1_ReadWriteByte(command); //发送写取状态寄存器命令
SPI1_ReadWriteByte(sr); //写入一个字节
W25QXX_CS_H(); //取消片选
}
//W25QXX写使能
//将WEL置位
void W25QXX_Write_Enable(void)
{
W25QXX_CS_L(); //使能器件
SPI1_ReadWriteByte(W25X_WriteEnable); //发送写使能
W25QXX_CS_H(); //取消片选
}
//W25QXX写禁止
//将WEL清零
void W25QXX_Write_Disable(void)
{
W25QXX_CS_L(); //使能器件
SPI1_ReadWriteByte(W25X_WriteDisable); //发送写禁止指令
W25QXX_CS_H(); //取消片选
}
//读取芯片ID
//返回值如下:
//0XEF13,表示芯片型号为W25Q80
//0XEF14,表示芯片型号为W25Q16
//0XEF15,表示芯片型号为W25Q32
//0XEF16,表示芯片型号为W25Q64
//0XEF17,表示芯片型号为W25Q128
//0XEF18,表示芯片型号为W25Q256
uint16_t W25QXX_ReadID(void)
{
uint16_t Temp = 0;
W25QXX_CS_L();
SPI1_ReadWriteByte(0x90);//发送读取ID命令
SPI1_ReadWriteByte(0x00);
SPI1_ReadWriteByte(0x00);
SPI1_ReadWriteByte(0x00);
Temp|=SPI1_ReadWriteByte(0xFF)<<8;
Temp|=SPI1_ReadWriteByte(0xFF);
W25QXX_CS_H();
return Temp;
}
//读取SPI FLASH
//在指定地址开始读取指定长度的数据
//pBuffer:数据存储区
//ReadAddr:开始读取的地址(24bit)
//NumByteToRead:要读取的字节数(最大65535)
void W25QXX_Read(uint8_t* pBuffer,uint32_t ReadAddr,uint16_t NumByteToRead)
{
uint16_t i;
W25QXX_CS_L(); //使能器件
SPI1_ReadWriteByte(W25X_ReadData); //发送读取命令
if(W25QXX_TYPE==W25Q256) //如果是W25Q256的话地址为4字节的，要发送最高8位
{
SPI1_ReadWriteByte((uint8_t)((ReadAddr)>>24));
}
SPI1_ReadWriteByte((uint8_t)((ReadAddr)>>16)); //发送24bit地址
SPI1_ReadWriteByte((uint8_t)((ReadAddr)>>8));
SPI1_ReadWriteByte((uint8_t)ReadAddr);
for(i=0;i<NumByteToRead;i++)
{
pBuffer[i]=SPI1_ReadWriteByte(0XFF); //循环读数
}
W25QXX_CS_H();
}
//SPI在一页(0~65535)内写入少于256个字节的数据
//在指定地址开始写入最大256字节的数据
//pBuffer:数据存储区
//WriteAddr:开始写入的地址(24bit)
//NumByteToWrite:要写入的字节数(最大256),该数不应该超过该页的剩余字节数!!!
void W25QXX_Write_Page(uint8_t* pBuffer,uint32_t WriteAddr,uint16_t NumByteToWrite)
{
uint16_t i;
W25QXX_Write_Enable(); //SET WEL
W25QXX_CS_L(); //使能器件
SPI1_ReadWriteByte(W25X_PageProgram); //发送写页命令
if(W25QXX_TYPE==W25Q256) //如果是W25Q256的话地址为4字节的，要发送最高8位
{
SPI1_ReadWriteByte((uint8_t)((WriteAddr)>>24));
}
SPI1_ReadWriteByte((uint8_t)((WriteAddr)>>16)); //发送24bit地址
SPI1_ReadWriteByte((uint8_t)((WriteAddr)>>8));
SPI1_ReadWriteByte((uint8_t)WriteAddr);
for(i=0;i<NumByteToWrite;i++)SPI1_ReadWriteByte(pBuffer[i]);//循环写数
W25QXX_CS_H(); //取消片选
W25QXX_Wait_Busy(); //等待写入结束
}
//无检验写SPI FLASH
//必须确保所写的地址范围内的数据全部为0XFF,否则在非0XFF处写入的数据将失败!
//具有自动换页功能
//在指定地址开始写入指定长度的数据,但是要确保地址不越界!
//pBuffer:数据存储区
//WriteAddr:开始写入的地址(24bit)
//NumByteToWrite:要写入的字节数(最大65535)
//CHECK OK
void W25QXX_Write_NoCheck(uint8_t* pBuffer,uint32_t WriteAddr,uint16_t NumByteToWrite)
{
uint16_t pageremain;
pageremain=256-WriteAddr%256; //单页剩余的字节数
if(NumByteToWrite<=pageremain)pageremain=NumByteToWrite;//不大于256个字节
while(1)
{
W25QXX_Write_Page(pBuffer,WriteAddr,pageremain);
if(NumByteToWrite==pageremain)break;//写入结束了
else //NumByteToWrite>pageremain
{
pBuffer+=pageremain;
WriteAddr+=pageremain;
NumByteToWrite-=pageremain; //减去已经写入了的字节数
if(NumByteToWrite>256)pageremain=256; //一次可以写入256个字节
else pageremain=NumByteToWrite; //不够256个字节了
}
};
}
//写SPI FLASH
//在指定地址开始写入指定长度的数据
//该函数带擦除操作!
//pBuffer:数据存储区
//WriteAddr:开始写入的地址(24bit)
//NumByteToWrite:要写入的字节数(最大65535)
uint8_t W25QXX_BUFFER[4096];
void W25QXX_Write(uint8_t* pBuffer,uint32_t WriteAddr,uint16_t NumByteToWrite)
{
uint32_t secpos;
uint16_t secoff;
uint16_t secremain;
uint16_t i;
uint8_t * W25QXX_BUF;
W25QXX_BUF=W25QXX_BUFFER;
secpos=WriteAddr/4096;//扇区地址
secoff=WriteAddr%4096;//在扇区内的偏移
secremain=4096-secoff;//扇区剩余空间大小
// printf("ad:%X,nb:%Xrn",WriteAddr,NumByteToWrite);//测试用
if(NumByteToWrite<=secremain)secremain=NumByteToWrite;//不大于4096个字节
while(1)
{
W25QXX_Read(W25QXX_BUF,secpos*4096,4096);//读出整个扇区的内容
for(i=0;i<secremain;i++)//校验数据
{
if(W25QXX_BUF[secoff+i]!=0XFF)
break;//需要擦除
}
if(i<secremain)//需要擦除
{
W25QXX_Erase_Sector(secpos);//擦除这个扇区
for(i=0;i<secremain;i++) //复制
{
W25QXX_BUF[i+secoff]=pBuffer[i];
}
W25QXX_Write_NoCheck(W25QXX_BUF,secpos*4096,4096);//写入整个扇区
}else
W25QXX_Write_NoCheck(pBuffer,WriteAddr,secremain);//写已经擦除了的,直接写入扇区剩余区间.
if(NumByteToWrite==secremain)
break;//写入结束了
else//写入未结束
{
secpos++;//扇区地址增1
secoff=0;//偏移位置为0
pBuffer+=secremain; //指针偏移
WriteAddr+=secremain;//写地址偏移
NumByteToWrite-=secremain; //字节数递减
if(NumByteToWrite>4096)
secremain=4096; //下一个扇区还是写不完
else
secremain=NumByteToWrite; //下一个扇区可以写完了
}
};
}
//擦除整个芯片
//等待时间超长...
void W25QXX_Erase_Chip(void)
{
W25QXX_Write_Enable(); //SET WEL
W25QXX_Wait_Busy();
W25QXX_CS_L(); //使能器件
SPI1_ReadWriteByte(W25X_ChipErase); //发送片擦除命令
W25QXX_CS_H(); //取消片选
W25QXX_Wait_Busy(); //等待芯片擦除结束
}
//擦除一个扇区
//Dst_Addr:扇区地址 根据实际容量设置
//擦除一个扇区的最少时间:150ms
void W25QXX_Erase_Sector(uint32_t Dst_Addr)
{
//监视falsh擦除情况,测试用
//printf("fe:%xrn",Dst_Addr);
Dst_Addr*=4096;
W25QXX_Write_Enable(); //SET WEL
W25QXX_Wait_Busy();
W25QXX_CS_L(); //使能器件
SPI1_ReadWriteByte(W25X_SectorErase); //发送扇区擦除指令
if(W25QXX_TYPE==W25Q256) //如果是W25Q256的话地址为4字节的，要发送最高8位
{
SPI1_ReadWriteByte((uint8_t)((Dst_Addr)>>24));
}
SPI1_ReadWriteByte((uint8_t)((Dst_Addr)>>16)); //发送24bit地址
SPI1_ReadWriteByte((uint8_t)((Dst_Addr)>>8));
SPI1_ReadWriteByte((uint8_t)Dst_Addr);
W25QXX_CS_H(); //取消片选
W25QXX_Wait_Busy(); //等待擦除完成
}
//等待空闲
void W25QXX_Wait_Busy(void)
{
while((W25QXX_ReadSR(1)&0x01)==0x01); // 等待BUSY位清空
}
//进入掉电模式
void W25QXX_PowerDown(void)
{
W25QXX_CS_L(); //使能器件
SPI1_ReadWriteByte(W25X_PowerDown); //发送掉电命令
W25QXX_CS_H(); //取消片选
HAL_Delay(3); //等待TPD
}
//唤醒
void W25QXX_WAKEUP(void)
{
W25QXX_CS_L(); //使能器件
SPI1_ReadWriteByte(W25X_ReleasePowerDown); // send W25X_PowerDown command 0xAB
W25QXX_CS_H(); //取消片选
HAL_Delay(3); //等待TRES1
}
//SPI1 读写一个字节
//TxData:要写入的字节
//返回值:读取到的字节
uint8_t SPI1_ReadWriteByte(uint8_t TxData)
{
uint8_t Rxdata;
HAL_SPI_TransmitReceive(&hspi1,&TxData,&Rxdata,1, 1000);
return Rxdata; //返回收到的数据
}
w25qxx.h
#ifndef __W25QXX_H
#define __W25QXX_H
#include"stdint.h"
#include "stm32f4xx_hal.h"
//W25X系列/Q系列芯片列表
//W25Q80 ID 0XEF13
//W25Q16 ID 0XEF14
//W25Q32 ID 0XEF15
//W25Q64 ID 0XEF16
//W25Q128 ID 0XEF17
//W25Q256 ID 0XEF18
#define W25Q80 0XEF13
#define W25Q16 0XEF14
#define W25Q32 0XEF15
#define W25Q64 0XEF16
#define W25Q128 0XEF17
#define W25Q256 0XEF18
#define NM25Q80 0X5213
#define NM25Q16 0X5214
#define NM25Q32 0X5215
#define NM25Q64 0X5216
#define NM25Q128 0X5217
#define NM25Q256 0X5218
extern uint16_t W25QXX_TYPE; //定义W25QXX芯片型号
#define W25QXX_CS_L() HAL_GPIO_WritePin(SPIFLASH_CS_GPIO_Port, SPIFLASH_CS_Pin, GPIO_PIN_RESET)
#define W25QXX_CS_H() HAL_GPIO_WritePin(SPIFLASH_CS_GPIO_Port, SPIFLASH_CS_Pin, GPIO_PIN_SET)
//
//指令表
#define W25X_WriteEnable 0x06
#define W25X_WriteDisable 0x04
#define W25X_ReadStatusReg1 0x05
#define W25X_ReadStatusReg2 0x35
#define W25X_ReadStatusReg3 0x15
#define W25X_WriteStatusReg1 0x01
#define W25X_WriteStatusReg2 0x31
#define W25X_WriteStatusReg3 0x11
#define W25X_ReadData 0x03
#define W25X_FastReadData 0x0B
#define W25X_FastReadDual 0x3B
#define W25X_PageProgram 0x02
#define W25X_BlockErase 0xD8
#define W25X_SectorErase 0x20
#define W25X_ChipErase 0xC7
#define W25X_PowerDown 0xB9
#define W25X_ReleasePowerDown 0xAB
#define W25X_DeviceID 0xAB
#define W25X_ManufactDeviceID 0x90
#define W25X_JedecDeviceID 0x9F
#define W25X_Enable4ByteAddr 0xB7
#define W25X_Exit4ByteAddr 0xE9
HAL_StatusTypeDef W25QXX_Init(void);
uint16_t W25QXX_ReadID(void); //读取FLASH ID
uint8_t W25QXX_ReadSR(uint8_t regno); //读取状态寄存器
void W25QXX_4ByteAddr_Enable(void); //使能4字节地址模式
void W25QXX_Write_SR(uint8_t regno,uint8_t sr); //写状态寄存器
void W25QXX_Write_Enable(void); //写使能
void W25QXX_Write_Disable(void); //写保护
void W25QXX_Write_NoCheck(uint8_t* pBuffer,uint32_t WriteAddr,uint16_t NumByteToWrite);
void W25QXX_Read(uint8_t* pBuffer,uint32_t ReadAddr,uint16_t NumByteToRead); //读取flash
void W25QXX_Write(uint8_t* pBuffer,uint32_t WriteAddr,uint16_t NumByteToWrite); //写入flash
void W25QXX_Erase_Chip(void); //整片擦除
void W25QXX_Erase_Sector(uint32_t Dst_Addr); //扇区擦除
void W25QXX_Wait_Busy(void); //等待空闲
void W25QXX_PowerDown(void); //进入掉电模式
void W25QXX_WAKEUP(void); //唤醒
void FatfsTest(void); //FLASH 虚拟U盘测试函数，进行初始化及文件读写操作，在user.diskio.c中定义
#endif
其中重要的为读SPI FLASH函数和写SPI FLASH函数
2.修改user_diskio.c
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file user_diskio.c
* @brief This file includes a diskio driver skeleton to be completed by the user.
******************************************************************************
* @attention
*
* <h2><center>© Copyright (c) 2021 STMicroelectronics.
* All rights reserved.</center></h2>
*
* This software component is licensed by ST under Ultimate Liberty license
* SLA0044, the "License"; You may not use this file except in compliance with
* the License. You may obtain a copy of the License at:
* www.st.com/SLA0044
*
******************************************************************************
*/
/* USER CODE END Header */
#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 "spi.h"
#include "w25qxx.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Disk status */
static volatile DSTATUS Stat = STA_NOINIT;
#define PAGE_SIZE 256
#define SECTOR_SIZE 4096
#define SECTOR_COUNT 200
#define BLOCK_SIZE 65536
#define FLASH_PAGES_PER_SECTOR SECTOR_SIZE/PAGE_SIZE
FATFS fs;
FIL file; /* 文件对象 */
FIL *pf = &file; //将FIL结构体对象设置为全局变量！
FRESULT f_res; /* 文件操作结果 */
UINT fnum; /* 文件成功读写数量*/
BYTE ReadBuffer[1024]={0}; /* 读缓存区 */
BYTE WriteBuffer[]= "PZKKKKK666n"; /* 文件写入内容 */
BYTE work[4096];
char USER_Path[4];
void mount_disk(void)
{
f_res = f_mount(&fs, USER_Path, 0);
return;
}
void format_disk(void)
{
f_res = f_mkfs(USER_Path, FM_FAT, 4096, work, sizeof(work));
}
UINT bw;
void create_file(void)
{
f_res = f_open(pf, "test.txt", FA_OPEN_ALWAYS | FA_WRITE);
f_res = f_write(&file, WriteBuffer, sizeof(WriteBuffer), &bw);
f_res = f_close(pf);
}
void read_file(void)
{
f_res = f_open(&file, "123.txt", FA_READ);
f_res = f_read(&file, ReadBuffer, sizeof(WriteBuffer), &bw);
f_res = f_close(&file);
}
FRESULT fileSystemInit()
{
FRESULT res = FR_OK;
res = f_mount(&fs, USER_Path, 1);
if (res != FR_OK)
{
//No Disk file system,format disk !
res = f_mkfs(USER_Path, FM_FAT, 4096, work, sizeof work);
if (res == FR_OK)
{
res = f_mount(&fs, USER_Path, 1);
if (res == 0)
{
return FR_OK;
}
else
return FR_DISK_ERR;
}
else
return FR_DISK_ERR;
}
else
return FR_OK;
}
//第一次运行文件系统，需要先注册文件系统和格式化
void FatfsTest(void)
{
// mount_disk(); //文件系统注册，
// format_disk(); //格式化文件系统
fileSystemInit();
create_file(); //创建TXT文件并写"PZKKKKK666n"
read_file(); //读取文件内容并放到ReadBuffer中
}
/* USER CODE END DECL */
/* Private function prototypes -----------------------------------------------*/
DSTATUS SpiDisk_initialize (BYTE pdrv);
DSTATUS SpiDisk_status (BYTE pdrv);
DRESULT SpiDisk_read (BYTE pdrv, BYTE *buff, DWORD sector, UINT count);
//#if _USE_WRITE == 1
DRESULT SpiDisk_write (BYTE pdrv, const BYTE *buff, DWORD sector, UINT count);
//#endif /* _USE_WRITE == 1 */
//#if _USE_IOCTL == 1
DRESULT SpiDisk_ioctl (BYTE pdrv, BYTE cmd, void *buff);
//#endif /* _USE_IOCTL == 1 */
Diskio_drvTypeDef SPI_Driver =
{
SpiDisk_initialize,
SpiDisk_status,
SpiDisk_read,
#if _USE_WRITE == 1
SpiDisk_write,
#endif /* _USE_WRITE == 1 */
#if _USE_IOCTL == 1
SpiDisk_ioctl,
#endif /* _USE_IOCTL == 1 */
};
/* Private functions ---------------------------------------------------------*/
/**
* @brief Initializes a Drive
* @param pdrv: Physical drive number (0..)
* @retval DSTATUS: Operation status
*/
DSTATUS SpiDisk_initialize (
BYTE pdrv /* Physical drive nmuber to identify the drive */
)
{
/* USER CODE BEGIN INIT */
Stat = STA_NOINIT;
if(W25QXX_ReadID() != 0)
{
Stat &= ~STA_NOINIT;
}
return Stat;
/* USER CODE END INIT */
}
/**
* @brief Gets Disk Status
* @param pdrv: Physical drive number (0..)
* @retval DSTATUS: Operation status
*/
DSTATUS SpiDisk_status (
BYTE pdrv /* Physical drive number to identify the drive */
)
{
/* USER CODE BEGIN STATUS */
Stat &= ~STA_NOINIT;
return Stat;
/* USER CODE END STATUS */
}
/**
* @brief Reads Sector(s)
* @param pdrv: Physical drive number (0..)
* @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 SpiDisk_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 BEGIN READ */
DRESULT res = RES_ERROR;
UINT i;
for(i = 0;i < count;i++)
{
W25QXX_Read(buff + i * 4096,sector * 4096 + i * 4096,4096 );
}
return RES_OK;
/* USER CODE END READ */
}
/**
* @brief Writes Sector(s)
* @param pdrv: Physical drive number (0..)
* @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 SpiDisk_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 BEGIN WRITE */
DRESULT res = RES_ERROR;
UINT i;
for(i = 0;i < count;i++)
{
W25QXX_Write((void *)(buff + i * 4096),sector * 4096 + i * 4096,4096 );
}
res = RES_OK;
/* USER CODE HERE */
return res;
/* USER CODE END WRITE */
}
#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 SpiDisk_ioctl (
BYTE pdrv, /* Physical drive nmuber (0..) */
BYTE cmd, /* Control code */
void *buff /* Buffer to send/receive control data */
)
{
/* USER CODE BEGIN IOCTL */
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;
/* USER CODE END IOCTL */
}
#endif /* _USE_IOCTL == 1 */
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
3.修改usbd_storage_if.c
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : usbd_storage_if.c
* @version : v1.0_Cube
* @brief : Memory management layer.
******************************************************************************
* @attention
*
* <h2><center>© Copyright (c) 2021 STMicroelectronics.
* All rights reserved.</center></h2>
*
* This software component is licensed by ST under Ultimate Liberty license
* SLA0044, the "License"; You may not use this file except in compliance with
* the License. You may obtain a copy of the License at:
* www.st.com/SLA0044
*
******************************************************************************
*/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "usbd_storage_if.h"
/* USER CODE BEGIN INCLUDE */
#include "w25qxx.h"
/* USER CODE END INCLUDE */
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PV */
/* Private variables ---------------------------------------------------------*/
/* USER CODE END PV */
/** @addtogroup STM32_USB_OTG_DEVICE_LIBRARY
* @brief Usb device.
* @{
*/
/** @defgroup USBD_STORAGE
* @brief Usb mass storage device module
* @{
*/
/** @defgroup USBD_STORAGE_Private_TypesDefinitions
* @brief Private types.
* @{
*/
/* USER CODE BEGIN PRIVATE_TYPES */
/* USER CODE END PRIVATE_TYPES */
/**
* @}
*/
/** @defgroup USBD_STORAGE_Private_Defines
* @brief Private defines.
* @{
*/
//#define STORAGE_LUN_NBR 1
//#define STORAGE_BLK_NBR 0x10000
//#define STORAGE_BLK_SIZ 0x200
/* USER CODE BEGIN PRIVATE_DEFINES */
//虚拟U盘的大小不知与此宏有关，懂得老哥麻烦说一声！！！
#define STORAGE_LUN_NBR 1
#define STORAGE_BLK_NBR 2048
#define STORAGE_BLK_SIZ 4096
/* USER CODE END PRIVATE_DEFINES */
/**
* @}
*/
/** @defgroup USBD_STORAGE_Private_Macros
* @brief Private macros.
* @{
*/
/* USER CODE BEGIN PRIVATE_MACRO */
/* USER CODE END PRIVATE_MACRO */
/**
* @}
*/
/** @defgroup USBD_STORAGE_Private_Variables
* @brief Private variables.
* @{
*/
/* USER CODE BEGIN INQUIRY_DATA_FS */
/** USB Mass storage Standard Inquiry Data. */
const int8_t STORAGE_Inquirydata_FS[] = {/* 36 */
/* LUN 0 */
0x00,
0x80,
0x02,
0x02,
(STANDARD_INQUIRY_DATA_LEN - 5),
0x00,
0x00,
0x00,
'S', 'T', 'M', ' ', ' ', ' ', ' ', ' ', /* Manufacturer : 8 bytes */
'P', 'r', 'o', 'd', 'u', 'c', 't', ' ', /* Product : 16 Bytes */
' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ',
'0', '.', '0' ,'1' /* Version : 4 Bytes */
};
/* USER CODE END INQUIRY_DATA_FS */
/* USER CODE BEGIN PRIVATE_VARIABLES */
/* USER CODE END PRIVATE_VARIABLES */
/**
* @}
*/
/** @defgroup USBD_STORAGE_Exported_Variables
* @brief Public variables.
* @{
*/
extern USBD_HandleTypeDef hUsbDeviceFS;
/* USER CODE BEGIN EXPORTED_VARIABLES */
/* USER CODE END EXPORTED_VARIABLES */
/**
* @}
*/
/** @defgroup USBD_STORAGE_Private_FunctionPrototypes
* @brief Private functions declaration.
* @{
*/
static int8_t STORAGE_Init_FS(uint8_t lun);
static int8_t STORAGE_GetCapacity_FS(uint8_t lun, uint32_t *block_num, uint16_t *block_size);
static int8_t STORAGE_IsReady_FS(uint8_t lun);
static int8_t STORAGE_IsWriteProtected_FS(uint8_t lun);
static int8_t STORAGE_Read_FS(uint8_t lun, uint8_t *buf, uint32_t blk_addr, uint16_t blk_len);
static int8_t STORAGE_Write_FS(uint8_t lun, uint8_t *buf, uint32_t blk_addr, uint16_t blk_len);
static int8_t STORAGE_GetMaxLun_FS(void);
/* USER CODE BEGIN PRIVATE_FUNCTIONS_DECLARATION */
/* USER CODE END PRIVATE_FUNCTIONS_DECLARATION */
/**
* @}
*/
USBD_StorageTypeDef USBD_Storage_Interface_fops_FS =
{
STORAGE_Init_FS,
STORAGE_GetCapacity_FS,
STORAGE_IsReady_FS,
STORAGE_IsWriteProtected_FS,
STORAGE_Read_FS,
STORAGE_Write_FS,
STORAGE_GetMaxLun_FS,
(int8_t *)STORAGE_Inquirydata_FS
};
/* Private functions ---------------------------------------------------------*/
/**
* @brief Initializes over USB FS IP
* @param lun:
* @retval USBD_OK if all operations are OK else USBD_FAIL
*/
int8_t STORAGE_Init_FS(uint8_t lun)
{
/* USER CODE BEGIN 2 */
return (USBD_OK);
/* USER CODE END 2 */
}
/**
* @brief .
* @param lun: .
* @param block_num: .
* @param block_size: .
* @retval USBD_OK if all operations are OK else USBD_FAIL
*/
int8_t STORAGE_GetCapacity_FS(uint8_t lun, uint32_t *block_num, uint16_t *block_size)
{
/* USER CODE BEGIN 3 */
*block_num = STORAGE_BLK_NBR;
*block_size = STORAGE_BLK_SIZ;
return (USBD_OK);
/* USER CODE END 3 */
}
/**
* @brief .
* @param lun: .
* @retval USBD_OK if all operations are OK else USBD_FAIL
*/
int8_t STORAGE_IsReady_FS(uint8_t lun)
{
/* USER CODE BEGIN 4 */
if(W25QXX_ReadID() != 0)
return (USBD_OK);
else
return -1;
// return (USBD_OK);
/* USER CODE END 4 */
}
/**
* @brief .
* @param lun: .
* @retval USBD_OK if all operations are OK else USBD_FAIL
*/
int8_t STORAGE_IsWriteProtected_FS(uint8_t lun)
{
/* USER CODE BEGIN 5 */
return (USBD_OK);
/* USER CODE END 5 */
}
/**
* @brief .
* @param lun: .
* @retval USBD_OK if all operations are OK else USBD_FAIL
*/
int8_t STORAGE_Read_FS(uint8_t lun, uint8_t *buf, uint32_t blk_addr, uint16_t blk_len)
{
/* USER CODE BEGIN 6 */
uint16_t i = 0;
for(i = 0;i < blk_len;i++)
{
W25QXX_Read(buf + i * STORAGE_BLK_SIZ,blk_addr * STORAGE_BLK_SIZ + i * STORAGE_BLK_SIZ,STORAGE_BLK_SIZ );
}
return (USBD_OK);
/* USER CODE END 6 */
}
/**
* @brief .
* @param lun: .
* @retval USBD_OK if all operations are OK else USBD_FAIL
*/
int8_t STORAGE_Write_FS(uint8_t lun, uint8_t *buf, uint32_t blk_addr, uint16_t blk_len)
{
/* USER CODE BEGIN 7 */
uint16_t i = 0;
for(i = 0;i < blk_len;i++)
{
W25QXX_Write((uint8_t *)(buf + i * STORAGE_BLK_SIZ),blk_addr * STORAGE_BLK_SIZ + i * STORAGE_BLK_SIZ,STORAGE_BLK_SIZ );
}
return (USBD_OK);
/* USER CODE END 7 */
}
/**
* @brief .
* @param None
* @retval .
*/
int8_t STORAGE_GetMaxLun_FS(void)
{
/* USER CODE BEGIN 8 */
return (STORAGE_LUN_NBR - 1);
/* USER CODE END 8 */
}
/* USER CODE BEGIN PRIVATE_FUNCTIONS_IMPLEMENTATION */
/* USER CODE END PRIVATE_FUNCTIONS_IMPLEMENTATION */
/**
* @}
*/
/**
* @}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
4.main.c主函数修改
/* USER CODE BEGIN 2 */
// W25QXX_Init();
// W25QXX_Write((uint8_t*)TEXT_Buffer,ADDERSS_FLASH,SIZE);
// W25QXX_Read(datatemp,ADDERSS_FLASH,SIZE);
FatfsTest();
/* USER CODE END 2 */
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "w25qxx.h"
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
//const uint8_t TEXT_Buffer[]={"PZK"};
//#define SIZE sizeof(TEXT_Buffer)
//#define ADDERSS_FLASH 0x000000
//uint8_t datatemp[SIZE];
/* USER CODE END PTD */
五、程序测试
编译无错误，下载程序到板子，调试。
1.PC端成功读取U盘，显示利用文件系统创建的TXT文件，文件内容即为
WriteBuffer[]= "PZKKKKK666n";
2.在pc端对U盘中TEST.TXT内容修改，同时可以注释掉void FatfsTest(void)中的create_file();因为文件已经在虚拟U盘中创建，我们此时需要读出文件内容，应用read_file();修改如下
同时修改
//第二次使用文件系统即可不用格式化文件系统，否则虚拟U盘中创建好的文件会消失
void FatfsTest(void)
{
// mount_disk();
// format_disk();
fileSystemInit();
// create_file();
read_file(); //读取创建好的文件中的内容并放到ReadBuffer中
}
3.成功读取TXT文件内容
测试完毕。
对于虚拟U盘大小，w25q128，容量为128Mbit，16MB，共有256个块，每个块16个扇区，每个扇区4K字节，一共有256*16个扇区。
修改user.diskio.c文件
/* Private variables ---------------------------------------------------------*/
/* Disk status */
static volatile DSTATUS Stat = STA_NOINIT;
#define PAGE_SIZE 256
#define SECTOR_SIZE 4096
#define SECTOR_COUNT 256 * 16
#define BLOCK_SIZE 65536
#define FLASH_PAGES_PER_SECTOR SECTOR_SIZE / PAGE_SIZE
修改之后，PC端显示U盘大小即为16MB
最后
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