找到StartDefaultTask函数，写如下代码测试U盘读取
- void StartDefaultTask(void const * argument)
- {
- /* init code for FATFS */
- MX_FATFS_Init();
-
- /* init code for USB_HOST */
- MX_USB_HOST_Init();
-
- /* USER CODE BEGIN 5 */
- osDelay(1000); //！！必须要有这个延时，不然f_mount不会成功
- int res = f_mount(&USBHFatFS,USBHPath,1);//挂载U盘
- //USBHFatFS、USBHPath这两个参数系统在fatfs.c里面已经定义好了，直接用
- if(res == FR_OK)
- {
- printf("f_mount SUCCESSFUL: %s\r\n",USBHPath);
- }
- else
- {
- printf("f_mount ERROR: %d\r\n",res);
- }
-
- osDelay(1000);
- res = f_open(&USBHFile,"0:/123.txt",FA_READ);//打开文件
- if(res == FR_OK)
- {
- printf("f_open SUCCESSFUL\r\n");
- }
- else
- {
- printf("f_open ERROR: %d\r\n",res);
- }
- char buffer[10] = { 0 };
- res = f_read(&USBHFile,buffer,10,NULL);
- printf("f_read buffer = %s\r\n",buffer);
- /* Infinite loop */
- for(;;)
- {
- HAL_GPIO_WritePin(GPIOA,GPIO_PIN_6,GPIO_PIN_RESET);
- osDelay(500);
- HAL_GPIO_WritePin(GPIOA,GPIO_PIN_6,GPIO_PIN_SET);
- osDelay(500);
- if(HAL_GPIO_ReadPin(GPIOE,GPIO_PIN_3) == 0)
- break;
- }
-
- /* USER CODE END 5 */
- }
| 
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