stm32f_open失败

STM32用CubeMX创建SDIO+FatFs，f_Open失败

如题，具体环境是CubeMX最新版，HAL库最新版，MDK5.24a，STLINKv2-1，板子是STM32F407Vet6核心板（某宝四五十块钱）。

SDIO单独测试TF卡（4G卡肯定不是正版）成功，可以读出CSD，CID，卡的状态，卡的容量等,SDIO四线无DMA读写正常。

本人前前后后试过无数次，好几个月，现在不得不弄好！感谢大佬的帮助！

CubeMX:SDIO四线，无DMA，无SDIO全局中断，勾选FatFS文件系统，文件系统加入长名STACK，单片机HEAP-0x800，STACK-0x1000

具体代码：

主程序：

/* USER CODE BEGIN PV */

/* Private variables ---------------------------------------------------------*/

FRESULT res /* FatFs function common retSDult code */

uint32_t byteswritten, bytesread/* File write/read counts */

uint8_t wtext[] = "This is STM32 working with FatFs"/* File write buffer */

uint8_t rtext[100] /* File read buffer */

/* USER CODE END PV */

int main(void)

{

/* USER CODE BEGIN 1 */

/* USER CODE END 1 */

/* MCU Configuration----------------------------------------------------------*/

/* Reset of all peripherals, Initializes the Flash interface and the Systick. */

HAL_Init()

/* USER CODE BEGIN Init */

/* USER CODE END Init */

/* Configure the system clock */

SystemClock_Config()

/* USER CODE BEGIN SysInit */

/* USER CODE END SysInit */

/* Initialize all configured peripherals */

MX_GPIO_Init()

MX_SDIO_SD_Init()

MX_USART2_UART_Init()

MX_FATFS_Init()

/* USER CODE BEGIN 2 */

****************************************************

从HAL库中F4Disco里抄来的代码

****************************************************

if(f_mount(&SDFatFS, (TCHAR const*)SDPath, 0) != FR_OK)

{

/* FatFs Initialization Error */

Error_Handler()

}

else

{

/* Create and Open a new text file object with write access */

if(f_open(&SDFile, "STM32.TXT", FA_CREATE_ALWAYS | FA_WRITE) != FR_OK)

{

/* 'STM32.TXT' file Open for write Error */

Error_Handler()

}

else

{

/* Write data to the text file */

res = f_write(&SDFile, wtext, sizeof(wtext), (void *)&byteswritten)

if((byteswritten == 0) || (retSD != FR_OK))

{

/* 'STM32.TXT' file Write or EOF Error */

Error_Handler()

}

else

{

/* Close the open text file */

f_close(&SDFile)

/* Open the text file object with read access */

if(f_open(&SDFile, "STM32.TXT", FA_READ) != FR_OK)

{

/* 'STM32.TXT' file Open for read Error */

Error_Handler()

}

else

{

/* Read data from the text file */

res = f_read(&SDFile, rtext, sizeof(rtext), (void *)&bytesread)

if((bytesread == 0) || (retSD != FR_OK))

{

/* 'STM32.TXT' file Read or EOF Error */

Error_Handler()

}

else

{

/* Close the open text file */

f_close(&SDFile)

/* Compare read data with the expected data */

if((bytesread != byteswritten))

{

/* Read data is different from the expected data */

Error_Handler()

}

else

{

/* Success of the demo: no error occurrence */

HAL_GPIO_WritePin(GPIOA, D2_Pin|D3_Pin, GPIO_PIN_SET)

}

}

}

}

}

}

/* Unlink the USB disk I/O driver */

FATFS_UnLinkDriver(SDPath)

/* USER CODE END 2 */

/* Infinite loop */

/* USER CODE BEGIN WHILE */

while (1)

{

/* USER CODE END WHILE */

/* USER CODE BEGIN 3 */

}

/* USER CODE END 3 */

}

****************************************************

单步调试结果 Sd_diskio.c中死循环

****************************************************

DRESULT SD_read(BYTE lun, BYTE *buff, DWORD sector, UINT count)

{

DRESULT res = RES_ERROR

ReadStatus = 0

uint32_t timeout

#if (ENABLE_SD_DMA_CACHE_MAINTENANCE == 1)

uint32_t alignedAddr

#endif

if(BSP_SD_ReadBlocks_DMA((uint32_t*)buff,

(uint32_t) (sector),

count) == MSD_OK)

{

/* Wait that the reading process is completed or a timeout occurs */

timeout = HAL_GetTick()

while((ReadStatus == 0) &&((HAL_GetTick() - timeout) <SD_TIMEOUT))//在此处无限循环

{

}

/* incase of a timeout return error */

if (ReadStatus == 0)

{

res = RES_ERROR

}

else

{

ReadStatus = 0

timeout = HAL_GetTick()

while((HAL_GetTick() - timeout) <SD_TIMEOUT)

{

if (BSP_SD_GetCardState() == SD_TRANSFER_OK)

{

res = RES_OK

#if (ENABLE_SD_DMA_CACHE_MAINTENANCE == 1)

/*

the SCB_InvalidateDCache_by_Addr() requires a 32-Byte aligned address,

adjust the address and the D-Cache size to invalidate accordingly.

*/

alignedAddr = (uint32_t)buff &~0x1F

SCB_InvalidateDCache_by_Addr((uint32_t*)alignedAddr, count*BLOCKSIZE + ((uint3

这个错误应该 实体框架（entity framework）抛出来的吧,意思不能连接上数据库.

1请检查你的链接字符串用户名密码有没有写错

2如果你使用WPF直接调用的实体框架 请把链接字符串拷贝到app.config 的<connectionStrings></connectionStrings>节点下

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