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STM32 通过USB接口读写挂载的SD卡(支持fatfs文件系统)
本文以STM32F407为例分别用HAL库(STM32CubeMX)和标准库实现SD卡对fatfs支持，以及通过USB接口读写SD卡。首先看电路连接：
SD卡部分：
USB接口：
HAL库
这种方式相对较为简单，提供自动生成工具，几乎没有什么代码量，但其中也有一些细节需要注意，跟着如下操作吧：
选择单片机型号(根据自己使用的片子选择)：
时钟和调试接口也根据自己板子设计选择：
DMA这边添加首发通道，同时把数据类型修改为Byte：
添加完后NVIC选项会多出两行：
USB部分：
使能中断：
文件系统部分：
还有重要的一步，这一步极为关键，就是中断优先级，大小关系得是SDIO global interrup >SDIO DMA > USB ,数字越小，优先级越高：
配置系统时钟树（根据实际选择，这里选择外部8M晶振）：
最后生成项目：
直接打开工程：
根据情况配置下载参数：
测试文件系统部分（缩减篇幅，删除了注释部分）：uint8_t readBuf[512]; uint8_t writeBuf[512]; BYTE work[_MAX_SS]; char *fileName = "test.txt"; uint32_t writeLen; uint32_t readLen; int main(void) { HAL_Init(); SystemClock_Config(); MX_GPIO_Init(); MX_DMA_Init(); MX_SDIO_SD_Init(); MX_FATFS_Init(); MX_USB_DEVICE_Init(); // 挂载 retSD = f_mount(&SDFatFS, SDPath, 1); switch(retSD) { case FR_NO_FILESYSTEM: // FM_FAT32 { retSD = f_mkfs(SDPath,FM_FAT32,512,work, sizeof(work)); if(retSD!=FR_OK) { while(1); } } break; case FR_OK:break; default: while(1); } // 写 retSD = f_open(&SDFile,fileName, FA_CREATE_ALWAYS | FA_WRITE); if(retSD!=FR_OK) { while(1); } sprintf((char *)writeBuf,"%s","abc123今天天气还可以\r\n"); retSD = f_write(&SDFile,writeBuf, strlen((const char *)writeBuf), &writeLen); if(retSD!=FR_OK) { while(1); } f_close(&SDFile); // 读 retSD = f_open(&SDFile,fileName, FA_OPEN_EXISTING | FA_READ); if(retSD!=FR_OK) { while(1); } retSD = f_read(&SDFile,readBuf, 50, &readLen); if(retSD!=FR_OK) { while(1); } f_close(&SDFile); // 卸载 f_mount(NULL, SDPath, 1); while (1) { } }- 1
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测试读写内容一致：
SD卡使用读卡器插入电脑，文件内容与写入一致：
USB部分还需要完善一些代码才可以使用，修改如下文件：#include "ff_gen_drv.h"- 1
然后就这个文件：
全部代码如下，可直接复制替换，主要是添加头文件以及完善几个函数：/* USER CODE BEGIN Header */ /** ****************************************************************************** * @file : usbd_storage_if.c * @version : v1.0_Cube * @brief : Memory management layer. ****************************************************************************** * @attention * *
* * 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 "sdio.h" #include "sd_diskio.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 */ /* 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 */ SD_Driver.disk_initialize(1); // 增加 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; *block_num = hsd.SdCard.BlockNbr ; *block_size = hsd.SdCard.BlockSize ; 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 */ return (SD_Driver.disk_status(lun)); /* 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 */ return (SD_Driver.disk_read(lun, buf, blk_addr, blk_len)); /* 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 */ return (SD_Driver.disk_write(lun, buf, blk_addr, blk_len)); /* 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****/© Copyright (c) 2022 STMicroelectronics. * All rights reserved. - 1
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然后编译下载，使用USB线连接单片机和电脑，即可在电脑上通过USB读写SD卡里内容了：
标准库
未完…
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- 原文地址：https://blog.csdn.net/u012902367/article/details/125883326
