STM32CubeMx入门教程(10)：Fatfs文件系统的应用

导语"fatfs是一个小型的文件系统，在小型的嵌入式系统中使用非常的广泛，STM32CubeMx自带该文件系统，我们通过简单的配置就能够使用，将前面的SD卡的读写操作进行修改，将文件系统挂载到SD卡进行操作，通过简单的文件创建、打开、写入、读取、关闭来演示如果使用Fatfs。"

第一节 系统要求

•软件

STM32CubeMX

•硬件

野火指南者开发板，SD卡

第二节 CubeMX配置

本节使用SDIO接口与SD卡连接，利用DMA模式读写SD卡，将FATFS文件系统挂载SD卡中。

1.SDIO配置

1.DMA配置

2.中断配置

3.Fatfs 文件系统的配置

Fatfs配置中我们选在支持中文文件名。选在SD Card,设置为logical drivers 为1.

按照上述配置后点击代码生成。

第三节 MDK 代码编写

使用MDK打开项目，在bspdriversd.c 中修改代码,并包含头文件#include "sdio.h"。

在BSPSDReadBlocks() 函数中修改，使用前面编写好的SDIO DMA读写的函数进行SD卡的读写，Fatfs文件系统将会在SDRead() 和SDWrite()调用该函数。

/* USER CODE END BeforeReadBlocksSection *//** * @brief Reads block(s) from a specified address in an SD card, in polling mode. * @parampData: Pointer to the buffer that will contain the data to transmit * @param ReadAddr: Address from where data is to be read * @param NumOfBlocks: Number of SD blocks to read * @param Timeout: Timeout for read operation * @retval SD status */__weakuint8_tBSP_SD_ReadBlocks(uint32_t*pData,uint32_tReadAddr,uint32_tNumOfBlocks,uint32_tTimeout){uint8_tsd_state = MSD_OK;if(SDIO_ReadBlocks_DMA(&hsd, (uint8_t*)pData,ReadAddr,NumOfBlocks) != HAL_OK) { sd_state = MSD_ERROR; }returnsd_state; }/* USER CODE BEGIN BeforeWriteBlocksSection *//*canbe used to modify previous code / undefine following code / add code *//* USER CODE END BeforeWriteBlocksSection *//** * @brief Writes block(s) to a specified address in an SD card, in polling mode. * @param pData: Pointer to the buffer that will contain the data to transmit * @param WriteAddr: Address from where data is to be written * @param NumOfBlocks: Number of SD blocks to write * @param Timeout: Timeout for write operation * @retval SD status */__weakuint8_tBSP_SD_WriteBlocks(uint32_t*pData,uint32_tWriteAddr,uint32_tNumOfBlocks,uint32_tTimeout){uint8_tsd_state = MSD_OK;if(SDIO_WriteBlocks_DMA(&hsd, (uint8_t*)pData,WriteAddr,NumOfBlocks) != HAL_OK) { sd_state = MSD_ERROR; }returnsd_state; }

直接修改SD的读写函数，在内部使用DMA模式。也可以在sddiskio.c 中修改SDread 和SD_Write 但是发现这个文件是只读模式，所以就不修改了。：

/** *@briefReads Sector(s) *@paramlun : not used *@param*buff: Data buffer to store read data *@paramsector: Sector address (LBA) *@paramcount: Number of sectors to read (1..128) *@retvalDRESULT: Operation result */DRESULTSD_read(BYTE lun, BYTE *buff, DWORD sector, UINT count){ DRESULT res = RES_ERROR; uint32_t timeout =100000;if(BSP_SD_ReadBlocks((uint32_t*)buff, (uint32_t) (sector), count, SD_DATATIMEOUT) == MSD_OK) {while(BSP_SD_GetCardState()!= MSD_OK) {if(timeout-- ==0) {returnRES_ERROR; } } res = RES_OK; }returnres; }/** *@briefWrites Sector(s) *@paramlun : not used *@param*buff: Data to be written *@paramsector: Sector address (LBA) *@paramcount: Number of sectors to write (1..128) *@retvalDRESULT: Operation result */#if_USE_WRITE ==1DRESULTSD_write(BYTE lun,constBYTE *buff, DWORD sector, UINT count){ DRESULT res = RES_ERROR; uint32_t timeout =100000;if(BSP_SD_WriteBlocks((uint32_t*)buff, (uint32_t)(sector), count, SD_DATATIMEOUT) == MSD_OK) {while(BSP_SD_GetCardState()!= MSD_OK) {if(timeout-- ==0) {returnRES_ERROR; } } res = RES_OK; }returnres; } #endif/* _USE_WRITE == 1 */

编译下载进行测试：

第四节效果演示

我们可以看见文件读写测试能够正常使用。