通过CubeMx配置SDMMC、Fatfs、使能内置DMA;此时配置生成工程可以正常挂载SD卡、访问文件;
接着添加FMC,此时需要开启MPU内存保护单元、开启Cache;生成工程,此时【retSD = f_mount(&SDFatFS,SDPath,1);//挂载盘符A】会出现f_mount挂载SD卡返回没有文件系统FR_NO_FILESYSTEM,但是SD卡是有文件系统的,即使接着格式化SD卡你会出现问题(retSD = f_mkfs(SDPath,0,0,work,sizeof(work));),会返回无效参数FR_INVALID_PARAMETER。
FR_NO_FILESYSTEM, /* (13) There is no valid FAT volume /
FR_INVALID_PARAMETER / (19) Given parameter is invalid */
stm32h7系列的sd卡内置了dma部分,所以需要考虑字节对齐的问题。
当我们在使用stm32cubemx生成代码时,没有字节对齐的选项;这时,就需要手动打开两个宏定义ENABLE_SD_DMA_CACHE_MAINTENANCE 、ENABLE_SCRATCH_BUFFER
文件:sd_diskio.c
/*
* when using cacheable memory region, it may be needed to maintain the cache
* validity. Enable the define below to activate a cache maintenance at each
* read and write operation.
* Notice: This is applicable only for cortex M7 based platform.
*/
/* USER CODE BEGIN enableSDDmaCacheMaintenance */
#define ENABLE_SD_DMA_CACHE_MAINTENANCE 1
/* USER CODE END enableSDDmaCacheMaintenance */
/*
* Some DMA requires 4-Byte aligned address buffer to correctly read/write data,
* in FatFs some accesses aren't thus we need a 4-byte aligned scratch buffer to correctly
* transfer data
*/
/* USER CODE BEGIN enableScratchBuffer */
#define ENABLE_SCRATCH_BUFFER
/* USER CODE END enableScratchBuffer */
机器翻译:
ENABLE_SD_DMA_CACHE_MAINTENANCE :当使用可缓存内存区域时,可能需要维护缓存有效性。启用下面的定义来激活每个缓存的维护读写操作。注意:这只适用于基于cortex M7的平台。
ENABLE_SCRATCH_BUFFER:一些DMA需要4字节对齐的地址缓冲区来正确读写数据。在fatf中,一些访问不是这样,因此我们需要一个4字节对齐的刮擦缓冲区来正确传输数据
此时就可以解决了
参考:https://blog.csdn.net/kavieen/article/details/124025353
/**SDMMC1 GPIO Configuration
PC8 ------> SDMMC1_D0
PC9 ------> SDMMC1_D1
PC10 ------> SDMMC1_D2
PC11 ------> SDMMC1_D3
PC12 ------> SDMMC1_CK
PD2 ------> SDMMC1_CMD
+Vmcu = +3.3V
注:CD引脚用于检测SD卡插拔,按需添加
选择外部晶振25MHz
SDMMC时钟110MHz
可以看到SDMMC需要小于25MHz
SDMMC_CK frequency = sdmmc_ker_ck / [2 * CLKDIV].
sdmmc_ker_ck = 110MHz
所以CLKDIV 最大等于3
SDMMC_CK frequency = 110MHz / (2*3) = 18.333MHz
配置SDMMC引脚所有都上拉
注:如果带RTOS,则必须使能FS_REENTRANT (Re-Entrancy)
CODE_PANGE:也可以选Chinese(需要占用较大RAM)的。直接用英文的防止了cubeide报出RAM用完的错误
FS_EXFAT:如果sd卡的格式不是fat32,而是exfat的话,这里一定要enable,不然会挂载失败,爆出FR_NOFILESYSTEM的错误
FS_REENTRANT (Re-Entrancy) FS_REENTRANT (Re-Entrancy) Parameter Description:FS_REENTRANT选项切换FatFs模块的可重入性(线程安全)。—0:禁止重入。SYNC_t和FS_TIMEOUT不起作用。依赖:当freeertos被禁用时强制禁用。
使能DMA
注意H7内置DMA,如果是其他型号,还需配置相对应的DMA
比如F4的还需配置四这里的DMA
添加个串口
生成工程
sd_diskio.c
开启宏ENABLE_SD_DMA_CACHE_MAINTENANCE、ENABLE_SCRATCH_BUFFER
/*
* when using cacheable memory region, it may be needed to maintain the cache
* validity. Enable the define below to activate a cache maintenance at each
* read and write operation.
* Notice: This is applicable only for cortex M7 based platform.
*/
/* USER CODE BEGIN enableSDDmaCacheMaintenance */
#define ENABLE_SD_DMA_CACHE_MAINTENANCE 1
/* USER CODE END enableSDDmaCacheMaintenance */
/*
* Some DMA requires 4-Byte aligned address buffer to correctly read/write data,
* in FatFs some accesses aren't thus we need a 4-byte aligned scratch buffer to correctly
* transfer data
*/
/* USER CODE BEGIN enableScratchBuffer */
#define ENABLE_SCRATCH_BUFFER
/* USER CODE END enableScratchBuffer */
添加已经写好的文件disk_driver.c、disk_driver.h
disk_driver文件用于挂载SD卡文件系统、格式化、读写文件示例函数
disk_driver.c
/**********************************************************************
*file:磁盘文件
*author:残梦
*versions:V1.0
*date:2023.10.10
*note:
**********************************************************************/
#include "disk_driver.h"
#include "sdmmc.h"
static int32_t Disk_Mount_SD(void);
static int Disk_File_Read_SystemParameter(void);
static status_EnumDef disk_state[eDisk_Num] = {eStatus_Invalid};//磁盘状态
/****************************************
@function:磁盘挂载
@param:void
@return:-1--失败,0--正常
@note:
****************************************/
int32_t Disk_Mount(void)
{
if(Disk_Mount_SD() < 0)
{
disk_state[eDisk_SD] = eStatus_Invalid;
return -1;
}else{disk_state[eDisk_SD] = eStatus_Valid;}
//Disk_File_Read_SystemParameter();
return 0;
}
/****************************************
@function:挂载磁盘-SD卡
@param:void
@return:-1--失败,0--正常
@note:
****************************************/
static int32_t Disk_Mount_SD(void)
{
BYTE work[_MAX_SS];
HAL_SD_CardInfoTypeDef SdCard;
retSD = f_mount(&SDFatFS,SDPath,1);//挂载盘符A
if(retSD == FR_NO_FILESYSTEM)//没有文件系统就格式化创建创建文件系统
{
retSD = f_mkfs(SDPath,0,0,work,sizeof(work));
if(retSD == FR_OK)
{
retSD = f_mount(NULL,SDPath,1);//格式化后,先取消挂载
retSD = f_mount(&SDFatFS,SDPath,1);//挂载
}
else//格式化失败
{
printf("Description Failed to format the SD card...%d\n",retSD);
goto SD_FAIL;
}
}
else if(retSD != FR_OK)//挂载失败
{
printf("Mount failure=%d\n",retSD);
goto SD_FAIL;
}
retSD = f_mount(&SDFatFS,SDPath,1);
if(retSD != FR_OK){printf("f_mount():retSD=%d\n",retSD);goto SD_FAIL;}
if(HAL_SD_GetCardInfo(&hsd1,&SdCard) != HAL_OK){printf("HAL_SD_GetCardInfo()\n");goto SD_FAIL;}
printf("SD卡容量:%.2fGB\n",(float)((uint64_t)SdCard.BlockNbr * (uint64_t)SdCard.BlockSize / 1024.0f / 1024.0f / 1024.0f));
return 0;
SD_FAIL:
{
printf("Error[Disk_Mount_SD()]:The disk fails to be mounted...\n");
return -1;
}
}
/****************************************
@function:获取磁盘状态
@param:void
@return:见status_EnumDef
@note:
****************************************/
status_EnumDef Disk_Status_Get(Disk_List_EnumDef disk)
{
return disk_state[disk];
}
/****************************************
@function:读取板参数文件
@param:
@return:-1--读取失败,0--成功
@note:
****************************************/
static int Disk_File_Read_SystemParameter(void)
{
FRESULT res_sd;
UINT fnum;
char string[200];
int32_t ByteNum = 0,value = 0;
uint32_t line = 0;
if(!Disk_Status_Get(eDisk_SD))return -1;
memset(string,0,sizeof(string));
sprintf(string,"%sSystemParameter.txt",SDPath);
res_sd = f_open(&SDFile, string, FA_OPEN_EXISTING | FA_READ);
if(res_sd == FR_NO_FILE)//文件不存在
{
printf("file does not exist:%s\n",string);
//创建默认文件
res_sd = f_open(&SDFile, string,FA_CREATE_ALWAYS | FA_WRITE );
if(res_sd != FR_OK)
{
printf("[%d]:Failed to create the file!%s\n",res_sd,string);
return -1;
}
memset(string,0,sizeof(string));
sprintf(string,"%s\n",bsp_BoardVersion);
ByteNum = strlen(string);
res_sd=f_write(&SDFile,string,ByteNum,&fnum);
if(&SDFile != NULL){res_sd = f_close(&SDFile);}
}
else if(res_sd != FR_OK)
{
printf("[%d]:File opening failure!%s\n",res_sd,string);
return -1;
}
line = 0;
while(!(f_eof(&SDFile)))
{
memset(string,0,sizeof(string));f_gets(string,sizeof(string),&SDFile);if(strlen(string) == 0){break;}
switch(line++)
{
case 0:
{
//sscanf(string,"RemoteControlID[%d]:{set range:0xFA-0xFD}\n",&value);
printf("%s\n",string);
}break;
default:break;
}
}
if(&SDFile != NULL){res_sd = f_close(&SDFile);}
return 0;
}
disk_driver.h
#ifndef _disk_driver_H_
#define _disk_driver_H_
#ifdef __cplusplus
extern "C" {
#endif
#include "main.h"
#include "fatfs.h"
typedef enum
{
eDisk_SD = 0,
eDisk_Num
}Disk_List_EnumDef;//磁盘资源列表
int32_t Disk_Mount(void);
status_EnumDef Disk_Status_Get(Disk_List_EnumDef disk);
#ifdef __cplusplus
}
#endif
#endif
补充:
typedef enum
{
eStatus_Invalid = 0,
eStatus_Valid = 1
}status_EnumDef;
主函数main.c添加头文件并调用挂载SD卡系统函数
if(Disk_Mount() < 0){Error_Handler();}