STM32CubeMX 105芯片USB Host读写U盘

问题描述：    本人的项目中要将一次不过100字节的少量数据存入U盘。最初用的是CH376芯片，后来发现STM32中有USB host资源的芯片比如105/107等都可以直接读写U盘，因此买来105的开发模块琢磨。
   该开发模块比较简练（后面会附上原理图），附送的代码可以正常使用。

   我找来微雪电子的例程，依样画葫芦，但出不来。
   下面附上原理图，我的STM32CubeMX配置过程及源代码，请朋友们支招。

105芯片的PA11、PA12分别接USB口的USB D-和USB D+.

J1正是U盘插口，+5V供电是由连接计算机USB口的J2提供的。105的PC9控制J1的+5V供电与否。

STM32CubeMX配置如上面的图。

潘斯凯

2018-11-16 09:06:42

/* Includes ------------------------------------------------------------------*/
#include "stm32f1xx_hal.h"
#include "fatfs.h"
#include "u***_host.h"

/* USER CODE BEGIN Includes */
#include "ff.h"
//#include "oled.h"
extern ApplicationTypeDef Appli_state;

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

/* USER CODE BEGIN PFP */

int main(void)
{

  /* USER CODE BEGIN 1 */
  static ApplicationTypeDef pre_state = APPLICATION_IDLE;
  volatile FRESULT fr;
  FATFS fs;
  FIL fil;
  UINT off = 0;
  uint8_t buff[20];
  /* 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_FATFS_Init();
  MX_USB_HOST_Init();

  /* USER CODE BEGIN 2 */

  // Enable USB Power
  HAL_GPIO_WritePin(USB_POWER_GPIO_Port, USB_POWER_Pin, GPIO_PIN_RESET);

  // Init OLED
  //  OLED_Init();
  //OLED_Clear();
  //OLED_ShowString(0,0,"[USB]Pls Insert Udisk!");
  //HAL_Delay(2000);

  /* USER CODE END 2 */

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

  /* USER CODE BEGIN 3 */
if (pre_state != Appli_state) {

switch(Appli_state)
{
case APPLICATION_DISCONNECT:
/* Register the file system object to the FatFs module */
if(f_mount(NULL, "", 0) != FR_OK)
{
printf("ERROR : Cannot exit FatFs! n");
}
// OLED_Clear();
// OLED_ShowString(0,0,"[USB]Disconnect!");
break;

case APPLICATION_READY:
// OLED_Clear();
// OLED_ShowString(0,0,"[USB]Connected!");
/* Open or create a log file and ready to append */
if(f_mount(&fs, "", 0) != FR_OK) {
break;
}

HAL_Delay(2000);
// OLED_ShowString(0,2,"[FAT]Open file!");

/* Opens an existing file. If not exist, creates a new file. */
fr = f_open(&fil, "0OG.TXT", FA_READ | FA_WRITE | FA_CREATE_ALWAYS);
if (fr != FR_OK)
break;

/* Append a line */
f_printf(&fil, "%sn", "[USB]uDisk OK!0123456789");

HAL_Delay(2000);
// OLED_ShowString(0,4,"[FAT]Write OK!");

fr = f_lseek(&fil, 0);
if (fr != FR_OK) {
   f_close(&fil);
   break;
}

f_read(&fil, buff, 16, &off);
buff[14] = 0;

HAL_Delay(2000);
// OLED_ShowString(0,6,buff);

/* Close the file */
f_close(&fil);
HAL_Delay(2000);
// OLED_Clear();
// OLED_ShowString(0,0,"[FAT]Close file!");

break;

default:
break;
}
}
pre_state = Appli_state;
  }
  /* USER CODE END 3 */

}