1 /* USER CODE BEGIN 2 */
 2 /*USB 重新枚舉函數(shù)*/
 3 void USB_Reset(void)
 4 {
 5     GPIO_InitTypeDef GPIO_InitStruct = {0};
 6     
 7     __HAL_RCC_GPIOA_CLK_ENABLE();
 8     
 9     GPIO_InitStruct.Pin = GPIO_PIN_12;
10     GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
11     GPIO_InitStruct.Pull = GPIO_NOPULL;
12     GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
13     HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
14     
15     HAL_GPIO_WritePin(GPIOA,GPIO_PIN_12,GPIO_PIN_RESET);
16     HAL_Delay(100);
17     HAL_GPIO_WritePin(GPIOA,GPIO_PIN_12,GPIO_PIN_SET);
18 }
19 /* USER CODE END 2 */

 1 /* Private includes ----------------------------------------------------------*/
 2 /* USER CODE BEGIN Includes */
 3 #include "usbd_cdc_if.h"
 4 /* USER CODE END Includes */
 5 
 6 /* Private typedef -----------------------------------------------------------*/
 7 /* USER CODE BEGIN PTD */
 8 
 9 /* USER CODE END PTD */
10 
11 /* Private define ------------------------------------------------------------*/
12 /* USER CODE BEGIN PD */
13 /* USER CODE END PD */
14 
15 /* Private macro -------------------------------------------------------------*/
16 /* USER CODE BEGIN PM */
17 
18 /* USER CODE END PM */
19 
20 /* Private variables ---------------------------------------------------------*/
21 
22 /* USER CODE BEGIN PV */
23 
24 /* USER CODE END PV */
25 
26 /* Private function prototypes -----------------------------------------------*/
27 void SystemClock_Config(void);
28 /* USER CODE BEGIN PFP */
29 
30 /* USER CODE END PFP */
31 
32 /* Private user code ---------------------------------------------------------*/
33 /* USER CODE BEGIN 0 */
34 
35 /* USER CODE END 0 */
36 
37 /**
38   * @brief  The application entry point.
39   * @retval int
40   */
41 int main(void)
42 {
43   /* USER CODE BEGIN 1 */
44     char str[] = "Hello World!\r\n";
45   /* USER CODE END 1 */
46 
47   /* MCU Configuration--------------------------------------------------------*/
48 
49   /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
50   HAL_Init();
51 
52   /* USER CODE BEGIN Init */
53 
54   /* USER CODE END Init */
55 
56   /* Configure the system clock */
57   SystemClock_Config();
58 
59   /* USER CODE BEGIN SysInit */
60 //    USB_Reset();
61   /* USER CODE END SysInit */
62 
63   /* Initialize all configured peripherals */
64   MX_GPIO_Init();
65   MX_USB_DEVICE_Init();
66   /* USER CODE BEGIN 2 */
67 
68   /* USER CODE END 2 */
69 
70   /* Infinite loop */
71   /* USER CODE BEGIN WHILE */
72   while (1)
73   {
74     /* USER CODE END WHILE */
75     CDC_Transmit_FS((uint8_t*)str, 14);
76     HAL_Delay(2000);
77     /* USER CODE BEGIN 3 */
78   }
79   /* USER CODE END 3 */
80 }

 1 /**
 2   * @brief  Data received over USB OUT endpoint are sent over CDC interface
 3   *         through this function.
 4   *
 5   *         @note
 6   *         This function will issue a NAK packet on any OUT packet received on
 7   *         USB endpoint until exiting this function. If you exit this function
 8   *         before transfer is complete on CDC interface (ie. using DMA controller)
 9   *         it will result in receiving more data while previous ones are still
10   *         not sent.
11   *
12   * @param  Buf: Buffer of data to be received
13   * @param  Len: Number of data received (in bytes)
14   * @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
15   */
16 static int8_t CDC_Receive_FS(uint8_t* Buf, uint32_t *Len)
17 {
18   /* USER CODE BEGIN 6 */
19     CDC_Transmit_FS(Buf, *Len);
20     
21   USBD_CDC_SetRxBuffer(&hUsbDeviceFS, &Buf[0]);
22   USBD_CDC_ReceivePacket(&hUsbDeviceFS);
23   return (USBD_OK);
24   /* USER CODE END 6 */
25 }

 1 /* USER CODE BEGIN PRIVATE_FUNCTIONS_IMPLEMENTATION */
 2 #include "stdarg.h"
 3 #include "stdio.h"
 4 
 5 uint8_t usbtemp[64];
 6 void usbvcom_printf(const char *format,...)
 7 {
 8     uint16_t     len;
 9     va_list     args;
10     
11     va_start(args, format);
12     len = vsnprintf((char *)usbtemp, sizeof(usbtemp)+1, (char *)format, args);
13     va_end(args);
14     
15     CDC_Transmit_HS(usbtemp, len);
16 }
17 
18 /* USER CODE END PRIVATE_FUNCTIONS_IMPLEMENTATION */