参考文章
以下的内容可能需要参考文章
USB重定向printf
STM32 SDIO 读写 TF卡
使用FatFs文件系统读写SD卡
CubeMX配置
在fatfs中勾选SD Card选项
代码分析
实现几个函数
创建app_flie_operate.c函数
#include "app_flie_operate.h"
#include "usbd_cdc_if.h"
// 定义用于格式化的工作区缓存
BYTE workBuffer[4 * User_Sector];
/*挂载FatFs文件系统*/
void Mount_FatFs(void)
{
// 挂载文件系统
FRESULT retUSER = f_mount(&User_FatFs, User_SDPath, 1);
// 发生错误
if (retUSER != FR_OK)
{
// 没有文件系统,需要格式化
if (retUSER == FR_NO_FILESYSTEM)
{
usb_printf("\r\nNo file system, start formatting\r\n");
// 创建文件系统
retUSER = f_mkfs(User_SDPath, FM_FAT32, 0, workBuffer, 4 * User_Sector);
// 格式化失败
if (retUSER != FR_OK)
{
usb_printf("Formatting failed, error code = %d \r\n", retUSER);
}
// 格式化成功
else
{
usb_printf("The formatting is successful, and the mounting starts again\r\n");
// 有文件系统后重新挂载
retUSER = f_mount(&User_FatFs, User_SDPath, 1);
// 挂载失败
if (retUSER != FR_OK)
{
usb_printf("Error occurred. Error code = %d \r\n", retUSER);
}
// 挂载成功
else
{
usb_printf("*** The file system is mounted successfully ***\r\n");
}
}
}
// 不是没有文件系统,而是发生其他错误
else
{
usb_printf("Another error occurred, error code = %d \r\n", retUSER);
}
}
// 有文件系统直接挂在成功
else
{
usb_printf("The file system is mounted successfully\r\n");
}
}
/*获取磁盘信息并在LCD上显示*/
void FatFs_GetDiskInfo(void)
{
FATFS *fs;
// 定义剩余簇个数变量
DWORD fre_clust;
// 获取剩余簇个数
FRESULT res = f_getfree("0:", &fre_clust, &fs);
// 获取失败
if (res != FR_OK)
{
usb_printf("f_getfree() error\r\n");
return;
}
usb_printf("\r\n*** FAT disk info ***\r\n");
// 总的扇区个数
DWORD tot_sect = (fs->n_fatent - 2) * fs->csize;
// 剩余的扇区个数 = 剩余簇个数 * 每个簇的扇区个数
DWORD fre_sect = fre_clust * fs->csize;
// 对于SD卡和U盘, _MIN_SS=512字节
#if _MAX_SS == _MIN_SS
// SD卡的_MIN_SS固定为512,右移11位相当于除以2048
// 剩余空间大小,单位:MB,用于SD卡,U盘
DWORD freespace = (fre_sect >> 11);
// 总空间大小,单位:MB,用于SD卡,U盘
DWORD totalSpace = (tot_sect >> 11);
#else
// Flash存储器,小容量
// 剩余空间大小,单位:KB
DWORD freespace = (fre_sect * fs->ssize) >> 10;
// 总空间大小,单位:KB
DWORD totalSpace = (tot_sect * fs->ssize) >> 10;
#endif
// FAT类型
usb_printf("FAT type = %d\r\n", fs->fs_type);
usb_printf("[1=FAT12,2=FAT16,3=FAT32,4=exFAT]\r\n");
// 扇区大小,单位字节
usb_printf("Sector size(bytes) = ");
// SD卡固定512字节
#if _MAX_SS == _MIN_SS
usb_printf("%d\r\n", _MIN_SS);
#else
// FLASH存储器
usb_printf("%d\r\n", fs->ssize);
#endif
usb_printf("Cluster size(sectors) = %d\r\n", fs->csize);
usb_printf("Total cluster count = %ld\r\n", fs->n_fatent - 2);
usb_printf("Total sector count = %ld\r\n", tot_sect);
// 总空间
#if _MAX_SS == _MIN_SS
usb_printf("Total space(MB) = %ld\r\n", totalSpace);
#else
usb_printf("Total space(KB) = %ld\r\n", totalSpace);
#endif
// 空闲簇数量
usb_printf("Free cluster count = %ld\r\n", fre_clust);
// 空闲扇区数量
usb_printf("Free sector count = %ld\r\n", fre_sect);
// 空闲空间
#if _MAX_SS == _MIN_SS
usb_printf("Free space(MB) = %ld\r\n", freespace);
#else
usb_printf("Free space(KB) = %ld\r\n", freespace);
#endif
usb_printf("Get FAT disk info OK\r\n");
}
/*创建文本文件*/
void FatFs_WriteTXTFile(TCHAR *filename, uint16_t year, uint8_t month, uint8_t day)
{
FIL file;
usb_printf("\r\n*** Creating TXT file: %s ***\r\n", filename);
FRESULT res = f_open(&file, filename, FA_CREATE_ALWAYS | FA_WRITE);
// 打开/创建文件成功
if (res == FR_OK)
{
// 字符串必须有换行符"\n"
TCHAR str[] = "Line1: Hello, FatFs***\n";
// 不会写入结束符"\0"
f_puts(str, &file);
usb_printf("Write file OK: %s\r\n", filename);
}
else
{
usb_printf("Open file error,error code: %d\r\n", res);
}
// 使用完毕关闭文件
f_close(&file);
}
/*读取一个文本文件的内容*/
void FatFs_ReadTXTFile(TCHAR *filename)
{
usb_printf("\r\n*** Reading TXT file: %s ***\r\n", filename);
FIL file;
// 以只读方式打开文件
FRESULT res = f_open(&file, filename, FA_READ);
// 打开成功
if (res == FR_OK)
{
// 读取缓存
TCHAR str[100];
// 没有读到文件内容末尾
while (!f_eof(&file))
{
// 读取1个字符串,自动加上结束符”\0”
f_gets(str, 100, &file);
usb_printf("%s", str);
}
usb_printf("\r\n");
}
// 如果没有该文件
else if (res == FR_NO_FILE)
usb_printf("File does not exist\r\n");
// 打开失败
else
usb_printf("f_open() error,error code: %d\r\n", res);
// 关闭文件
f_close(&file);
}
/*扫描和显示指定目录下的文件和目录*/
void FatFs_ScanDir(const TCHAR *PathName)
{
DIR dir; // 目录对象
FILINFO fno; // 文件信息
// 打开目录
FRESULT res = f_opendir(&dir, PathName);
// 打开失败
if (res != FR_OK)
{
// 关闭目录,直接退出函数
f_closedir(&dir);
usb_printf("\r\nf_opendir() error,error code: %d\r\n", res);
return;
}
usb_printf("\r\n*** All entries in dir: %s ***\r\n", PathName);
// 顺序读取目录中的文件
while (1)
{
// 读取目录下的一个项
res = f_readdir(&dir, &fno);
// 文件名为空表示没有多的项可读了
if (res != FR_OK || fno.fname[0] == 0)
break;
// 如果是一个目录
if (fno.fattrib & AM_DIR)
{
usb_printf("DIR: %s\r\n", fno.fname);
}
// 如果是一个文件
else
{
usb_printf("FILE: %s\r\n", fno.fname);
}
}
// 扫描完毕,关闭目录
usb_printf("Scan dir OK\r\n");
f_closedir(&dir);
}
/*获取一个文件的文件信息*/
void FatFs_GetFileInfo(TCHAR *filename)
{
usb_printf("\r\n*** File info of: %s ***\r\n", filename);
FILINFO fno;
// 检查文件或子目录是否存在
FRESULT fr = f_stat(filename, &fno);
// 如果存在从fno中读取文件信息
if (fr == FR_OK)
{
usb_printf("File size(bytes) = %ld\r\n", fno.fsize);
usb_printf("File attribute = 0x%x\r\n", fno.fattrib);
usb_printf("File Name = %s\r\n", fno.fname);
// 输出创建/修改文件时的时间戳
FatFs_PrintfFileDate(fno.fdate, fno.ftime);
}
// 如果没有该文件
else if (fr == FR_NO_FILE)
usb_printf("File does not exist\r\n");
// 发生其他错误
else
usb_printf("f_stat() error,error code: %d\r\n", fr);
}
/*删除文件*/
void FatFs_DeleteFile(TCHAR *filename)
{
usb_printf("\r\n*** Delete File: %s ***\r\n", filename);
FIL file;
// 打开文件
FRESULT res = f_open(&file, filename, FA_OPEN_EXISTING);
if (res == FR_OK)
{
// 关闭文件
f_close(&file);
usb_printf("open successfully!\r\n");
}
// 删除文件
res = f_unlink(filename);
// 删除成功
if (res == FR_OK)
{
usb_printf("The file was deleted successfully!\r\n");
}
// 删除失败
else
{
usb_printf("File deletion failed, error code:%d\r\n", res);
}
}
/*打印输出文件日期*/
void FatFs_PrintfFileDate(WORD date, WORD time)
{
usb_printf("File data = %d/%d/%d\r\n", ((date >> 9) & 0x7F) + 1980, (date >> 5) & 0xF, date & 0x1F);
usb_printf("File time = %d:%d:%d\r\n", (time >> 11) & 0x1F, (time >> 5) & 0x3F, time & 0x1F);
}
创建app_flie_opreate.h
#ifndef __APP_FILE_OPERATE_H__
#define __APP_FILE_OPERATE_H__
#include "main.h"
#include "FatFs.h"
#include "stdio.h"
/*定义自己的存储设备*/
/*用户存储设备扇区字节数*/
#define User_Sector 4096
/*用户存储设备FatFS对象*/
#define User_FatFs SDFatFS
/*用户存储设备卷路径*/
#define User_SDPath SDPath
/*函数声明*/
void Mount_FatFs(void);
void FatFs_GetDiskInfo(void);
void FatFs_ScanDir(const TCHAR *PathName);
void FatFs_ReadTXTFile(TCHAR *filename);
void FatFs_WriteTXTFile(TCHAR *filename, uint16_t year, uint8_t month, uint8_t day);
void FatFs_GetFileInfo(TCHAR *filename);
void FatFs_DeleteFile(TCHAR *filename);
void FatFs_PrintfFileDate(WORD date, WORD time);
#endif
创建以下函数
/**
* @brief SD卡文件系统测试
* @param
*/
void SD_FATFS_TEST_Task(void )
{
HAL_Delay(5000);
HAL_StatusTypeDef status;
status = HAL_SD_Init(&hsd1); /* 初始化 */
if(status != HAL_OK)
{
usb_printf("SD card initialize failed!\n");
while(1)
{
HAL_Delay(1000);
usb_printf("SD card initialize failed!\n");
}
}
HAL_SD_CardStateTypeDef state = HAL_SD_GetCardState(&hsd1);
if(state == HAL_SD_CARD_TRANSFER)
{
HAL_SD_GetCardCID(&hsd1, &SD_CardCID);
usb_printf("\nInitialize SD card sucessfully!\r\n");
usb_printf("\nSD card information\r\n");
usb_printf("\nCapacity :%llu\r\n", ((unsigned long long)hsd1.SdCard.BlockSize*hsd1.SdCard.BlockNbr));
usb_printf("\nBlockSize :%d\r\n", hsd1.SdCard.BlockSize);
usb_printf("\nRCA :%d\r\n", hsd1.SdCard.RelCardAdd);
usb_printf("\nCardType :%d\r\n", hsd1.SdCard.CardType);
usb_printf("\nManufacturerID :%d\r\n", SD_CardCID.ManufacturerID);
}
else
{
usb_printf("\nSD card initialize failed.\n");
}
Mount_FatFs();
while (1)
{
/*按键1被按下*/
if (HAL_GPIO_ReadPin(KEY1_GPIO_Port, KEY1_Pin) == GPIO_PIN_RESET)
{
HAL_Delay(50);
if (HAL_GPIO_ReadPin(KEY1_GPIO_Port, KEY1_Pin) == GPIO_PIN_RESET)
{
FatFs_ScanDir("0:/");
while (!HAL_GPIO_ReadPin(KEY1_GPIO_Port, KEY1_Pin))
;
}
}
/*按键KEY2被按下*/
if (HAL_GPIO_ReadPin(KEY2_GPIO_Port, KEY2_Pin) == GPIO_PIN_RESET)
{
HAL_Delay(50);
if (HAL_GPIO_ReadPin(KEY2_GPIO_Port, KEY2_Pin) == GPIO_PIN_RESET)
{
FatFs_WriteTXTFile("test.txt", 2024, 5, 30);
while (!HAL_GPIO_ReadPin(KEY2_GPIO_Port, KEY2_Pin))
;
}
}
/*按键KEY3被按下*/
if (HAL_GPIO_ReadPin(KEY3_GPIO_Port, KEY3_Pin) == GPIO_PIN_RESET)
{
HAL_Delay(50);
if (HAL_GPIO_ReadPin(KEY3_GPIO_Port, KEY3_Pin) == GPIO_PIN_RESET)
{
FatFs_ReadTXTFile("test.txt");
FatFs_GetFileInfo("test.txt");
while (!HAL_GPIO_ReadPin(KEY3_GPIO_Port, KEY3_Pin))
;
}
}
}
}
在main.c文件中调用
实验结果
显示挂载成功