USB_DEVICE — 复合设备: VCP + 键盘

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71

#include "at32f403a_407_board.h"
#include "at32f403a_407_clock.h"
#include "usbd_core.h"
#include "cdc_keyboard_class.h"
#include "cdc_keyboard_desc.h"
#include "usbd_int.h"

int main(void)
{
  uint16_t data_len;

  uint32_t timeout;

  uint8_t send_zero_packet = 0;

  /* config nvic priority group */
  nvic_priority_group_config(NVIC_PRIORITY_GROUP_4);

  system_clock_config();

  at32_board_init();

  /* select usb 48m clcok source */
  usb_clock48m_select(USB_CLK_HEXT);

  /* enable usb clock */
  crm_periph_clock_enable(CRM_USB_PERIPH_CLOCK, TRUE);

  /* enable usb interrupt */
  nvic_irq_enable(USBFS_L_CAN1_RX0_IRQn, 0, 0);

  /* usb core init */
  usbd_core_init(&usb_core_dev, USB, &cdc_keyboard_class_handler, &cdc_keyboard_desc_handler, 0);

  /* enable usb pull-up */
  usbd_connect(&usb_core_dev);

  while(1)
  {
    /* get usb vcp receive data */
    data_len = usb_vcpkybrd_vcp_get_rxdata(&usb_core_dev, usb_buffer);

    if(data_len > 0 || send_zero_packet == 1)
    {
      /* bulk transfer is complete when the endpoint does one of the following
         1 has transferred exactly the amount of data expected
         2 transfers a packet with a payload size less than wMaxPacketSize or transfers a zero-length packet
      */
      if(data_len > 0)
        send_zero_packet = 1;

      if(data_len == 0)
        send_zero_packet = 0;

      timeout = 5000000;
      do
      {
        /* send data to host */
        if(usb_vcpkybrd_vcp_send_data(&usb_core_dev, usb_buffer, data_len) == SUCCESS)
        {
          break;
        }
      }while(timeout --);
    }

    if(at32_button_press() == USER_BUTTON)
    {
      keyboard_send_string(&usb_core_dev, (uint8_t *)" Keyboard Demo\r\n", 16);
    }
  }
}