8. USB HID Device

https://www.usb.org/sites/default/files/documents/hut1_12v2.pdf

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勾选 “Generate peripheral initialization ...” 一项，以便能够更改库函数

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打开 usbd_hid.c 和 usb_device.c 文件

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main.c

/* USER CODE BEGIN Includes */
#include "usbd_hid.h"
/* USER CODE END Includes */

// ...

  /* USER CODE BEGIN 2 */

  extern USBD_HandleTypeDef hUsbDeviceFS;
  uint8_t HID_buffer[8] = {0};
  /* USER CODE END 2 */

  // ...

    /* USER CODE BEGIN 3 */

    HID_buffer[0] = 0b00000010; // shift
    HID_buffer[2] = 7;          // D

    USBD_HID_SendReport(&hUsbDeviceFS, HID_buffer, 8);
    HAL_Delay(20);

    HID_buffer[0] = 0; // shift
    HID_buffer[2] = 0;          // D

    USBD_HID_SendReport(&hUsbDeviceFS, HID_buffer, 8);

    HAL_Delay(2000);

  }
  /* USER CODE END 3 */