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   源码介绍

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This sample code shows how to use STM32F4xx PWR HAL API to enter
  * and exit the stop mode

实现usb

利用stm32cube实现USB FATFS的usbdisk程序--实现Fatfs对U盘文件操作

FATFS mynewdiskFatFs;//用户逻辑驱动的文件系统对象
FIL MyFile; //文件对象
char mynewdiskPath[4];//用户逻辑驱动路径

还需要依次使用

FATFS_LinkDriver();
f_mount();
f_open();
f_write();
f_close();

/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx_hal.h"
#include "fatfs.h"
#include "usb_host.h"
#include "gpio.h"

/* USER CODE BEGIN Includes */

/* USER CODE END Includes */

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

/* USER CODE BEGIN PV */
/* Private variables ---------------------------------------------------------*/
extern ApplicationTypeDef Appli_state;
extern USBH_HandleTypeDef hUsbHostFS;
extern char USBH_Path[4];  /* USBH logical drive path */
/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
void Error_Handler(void);
void MX_USB_HOST_Process(void);

/* USER CODE BEGIN PFP */
/* Private function prototypes -----------------------------------------------*/
static void MSC_Application(void);
/* USER CODE END PFP */

/* USER CODE BEGIN 0 */
FATFS USBDISKFatFs;           /* File system object for USB disk logical drive */
FIL MyFile;                   /* File object */
/* USER CODE END 0 */

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();

    /* Configure the system clock */
    SystemClock_Config();

    /* Initialize all configured peripherals */
    MX_GPIO_Init();
	  MX_USB_HOST_Init();
    MX_FATFS_Init();


    /* USER CODE BEGIN 2 */

    /* USER CODE END 2 */

    /* Infinite loop */
    /* USER CODE BEGIN WHILE */
    while (1)
    {
        /* USER CODE END WHILE */
        MX_USB_HOST_Process();

        /* USER CODE BEGIN 3 */
        switch(Appli_state)
        {
        case APPLICATION_READY:
            MSC_Application();
            Appli_state = APPLICATION_DISCONNECT;
            break;

        case APPLICATION_DISCONNECT:
            f_mount(NULL, (TCHAR const*)"", 0);

            break;
        default:
            break;
        }
    }
    /* USER CODE END 3 */

}

/** System Clock Configuration
*/
void SystemClock_Config(void)
{

    RCC_OscInitTypeDef RCC_OscInitStruct;
    RCC_ClkInitTypeDef RCC_ClkInitStruct;

    __HAL_RCC_PWR_CLK_ENABLE();

    __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
    RCC_OscInitStruct.HSEState = RCC_HSE_ON;
    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
    RCC_OscInitStruct.PLL.PLLM = 4;
    RCC_OscInitStruct.PLL.PLLN = 168;
    RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
    RCC_OscInitStruct.PLL.PLLQ = 7;
    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
    {
        Error_Handler();
    }

    RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                                  |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
    {
        Error_Handler();
    }

    HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);

    HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);

    /* SysTick_IRQn interrupt configuration */
    HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
}

/* USER CODE BEGIN 4 */
static void MSC_Application(void)
{
    FRESULT res;                                          /* FatFs function common result code */
    uint32_t byteswritten;                   /* File write/read counts */
    uint8_t wtext[] = "The site is STM32cube.com working with FatFs"; /* File write buffer */
//  uint8_t rtext[100];                                   /* File read buffer */

    /* Register the file system object to the FatFs module */
    if(f_mount(&USBDISKFatFs, (TCHAR const*)USBH_Path, 0) != FR_OK)
    {
        /* FatFs Initialization Error */
        Error_Handler();
    }
    else
    {
        /* Create and Open a new text file object with write access */
        if(f_open(&MyFile, "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(&MyFile, wtext, sizeof(wtext), (void *)&byteswritten);

            if((byteswritten == 0) || (res != FR_OK))
            {
                /* 'STM32.TXT' file Write or EOF Error */
                Error_Handler();
            }
            else
            {
                /* Close the open text file */
                f_close(&MyFile);
            }
        }
    }
}
/* USER CODE END 4 */

/**
  * @brief  This function is executed in case of error occurrence.
  * @param  None
  * @retval None
  */
void Error_Handler(void)
{
    /* USER CODE BEGIN Error_Handler */
    /* User can add his own implementation to report the HAL error return state */
    while(1)
    {
        HAL_Delay(500);
        HAL_GPIO_TogglePin(GPIOD,GPIO_PIN_12|GPIO_PIN_13);
    }
    /* USER CODE END Error_Handler */
}