今天用STM32CUBEMX 生成USB 的 custom human interface device 模式。
根据网上的教程，很容易地与上位机通信。

我用BUS HOUND 抓数据时，发现每个包都是2byte。

但是项目需要传输多位，我以为修改
USBD_CUSTOM_HID_SendReport(&hUsbDeviceFS,sendbuffer , 2 );
后面的2 就可以改变每个包数据位数，但是抓包发现数据 被拆分成多个 2 byte 的包。

我上位机显示HID 是 2 byte。
第二行 input report byte length 2

1. /** @defgroup USBD_AUDIO_IF_Private_Variables
   
2. * @{
   
3. */
   
4. __ALIGN_BEGIN static uint8_t CUSTOM_HID_ReportDesc_FS[USBD_CUSTOM_HID_REPORT_DESC_SIZE] __ALIGN_END =
   
5. {
   
6.   /* USER CODE BEGIN 0 */
   
7.    
   
8.     0x06, 0xFF, 0x00, /* USAGE_PAGE (Vendor Page: 0xFF00) */
   
9.     0x09, 0x01, /* USAGE (Demo Kit) */
   
10.     0xa1, 0x01, /* COLLECTION (Application) */ /* 6 */ /* LED1 */
    
11.     0x85, LED1_REPORT_ID, /* REPORT_ID (1) */
    
12.     0x09, 0x01, /* USAGE (LED 1) */
    
13.     0x15, 0x00, /* LOGICAL_MINIMUM (0) */
    
14.     0x25, 0x01, /* LOGICAL_MAXIMUM (1) */
    
15.     0x75, 0x08, /* REPORT_SIZE (8) */
    
16.     0x95, LED1_REPORT_COUNT, /* REPORT_COUNT (1) */
    
17.     0xB1, 0x82, /* FEATURE (Data,Var,Abs,Vol) */
    
18.     0x85, LED1_REPORT_ID, /* REPORT_ID (1) */
    
19.     0x09, 0x01, /* USAGE (LED 1) */
    
20.     0x91, 0x82, /* OUTPUT (Data,Var,Abs,Vol) */ /* 26 */ /* LED2 */
    
21.     0x85, LED2_REPORT_ID, /* REPORT_ID 2 */
    
22.     0x09, 0x02, /* USAGE (LED 2) */
    
23.     0x15, 0x00, /* LOGICAL_MINIMUM (0) */
    
24.     0x25, 0x01, /* LOGICAL_MAXIMUM (1) */
    
25.     0x75, 0x08, /* REPORT_SIZE (8) */
    
26.     0x95, LED2_REPORT_COUNT, /* REPORT_COUNT (1) */
    
27.     0xB1, 0x82, /* FEATURE (Data,Var,Abs,Vol) */
    
28.     0x85, LED2_REPORT_ID, /* REPORT_ID (2) */
    
29.     0x09, 0x02, /* USAGE (LED 2) */
    
30.     0x91, 0x82, /* OUTPUT (Data,Var,Abs,Vol) */ /* 46 */ /* LED3 */
    
31.     0x85, LED3_REPORT_ID, /* REPORT_ID (3) */
    
32.     0x09, 0x03, /* USAGE (LED 3) */
    
33.     0x15, 0x00, /* LOGICAL_MINIMUM (0) */
    
34.     0x25, 0x01, /* LOGICAL_MAXIMUM (1) */
    
35.     0x75, 0x08, /* REPORT_SIZE (8) */
    
36.     0x95, LED3_REPORT_COUNT, /* REPORT_COUNT (1) */
    
37.     0xB1, 0x82, /* FEATURE (Data,Var,Abs,Vol) */
    
38.     0x85, LED3_REPORT_ID, /* REPORT_ID (3) */
    
39.     0x09, 0x03, /* USAGE (LED 3) */
    
40.     0x91, 0x82, /* OUTPUT (Data,Var,Abs,Vol) */
    
41.     /* 66 */
    
42.     /* LED4 */
    
43.     0x85, LED4_REPORT_ID, /* REPORT_ID 4) */
    
44.     0x09, 0x04, /* USAGE (LED 4) */
    
45.     0x15, 0x00, /* LOGICAL_MINIMUM (0) */
    
46.     0x25, 0x01, /* LOGICAL_MAXIMUM (1) */
    
47.     0x75, 0x08, /* REPORT_SIZE (8) */
    
48.     0x95, LED4_REPORT_COUNT, /* REPORT_COUNT (1) */
    
49.     0xB1, 0x82, /* FEATURE (Data,Var,Abs,Vol) */
    
50.     0x85, LED4_REPORT_ID, /* REPORT_ID (4) */
    
51.     0x09, 0x04, /* USAGE (LED 4) */
    
52.     0x91, 0x82, /* OUTPUT (Data,Var,Abs,Vol) */
    
53.     /* 86 */
    
54.     /* key Push Button */
    
55.     0x85, KEY_REPORT_ID, /* REPORT_ID (5) */
    
56.     0x09, 0x05, /* USAGE (Push Button) */
    
57.     0x15, 0x00, /* LOGICAL_MINIMUM (0) */
    
58.     0x25, 0x01, /* LOGICAL_MAXIMUM (1) */
    
59.     0x75, 0x01, /* REPORT_SIZE (1) */
    
60.     0x81, 0x82, /* INPUT (Data,Var,Abs,Vol) */
    
61.     0x09, 0x05, /* USAGE (Push Button) */
    
62.     0x75, 0x01, /* REPORT_SIZE (1) */
    
63.     0xb1, 0x82, /* FEATURE (Data,Var,Abs,Vol) */
    
64.     0x75, 0x07, /* REPORT_SIZE (7) */
    
65.     0x81, 0x83, /* INPUT (Cnst,Var,Abs,Vol) */
    
66.     0x85, KEY_REPORT_ID, /* REPORT_ID (2) */
    
67.     0x75, 0x07, /* REPORT_SIZE (7) */
    
68.     0xb1, 0x83, /* FEATURE (Cnst,Var,Abs,Vol) */
    
69.     /* 114 */
    
70.     /* Tamper Push Button */
    
71.     0x85, TAMPER_REPORT_ID,/* REPORT_ID (6) */
    
72.     0x09, 0x06, /* USAGE (Tamper Push Button) */
    
73.     0x15, 0x00, /* LOGICAL_MINIMUM (0) */
    
74.     0x25, 0x01, /* LOGICAL_MAXIMUM (1) */
    
75.     0x75, 0x01, /* REPORT_SIZE (1) */
    
76.     0x81, 0x82, /* INPUT (Data,Var,Abs,Vol) */
    
77.     0x09, 0x06, /* USAGE (Tamper Push Button) */
    
78.     0x75, 0x01, /* REPORT_SIZE (1) */
    
79.     0xb1, 0x82, /* FEATURE (Data,Var,Abs,Vol) */
    
80.     0x75, 0x07, /* REPORT_SIZE (7) */
    
81.    
    
82.     0x81, 0x83, /* INPUT (Cnst,Var,Abs,Vol) */
    
83.     0x85, TAMPER_REPORT_ID,/* REPORT_ID (6) */
    
84.     0x75, 0x07, /* REPORT_SIZE (7) */
    
85.     0xb1, 0x83, /* FEATURE (Cnst,Var,Abs,Vol) */
    
86.     /* 142 */
    
87.     /* ADC IN */
    
88.     0x85, ADC_REPORT_ID, /* REPORT_ID */
    
89.     0x09, 0x07, /* USAGE (ADC IN) */
    
90.     0x15, 0x00, /* LOGICAL_MINIMUM (0) */
    
91.     0x26, 0xff, 0x00, /* LOGICAL_MAXIMUM (255) */
    
92.     0x75, 0x08, /* REPORT_SIZE (8) */
    
93.     0x81, 0x82, /* INPUT (Data,Var,Abs,Vol) */
    
94.     0x85, ADC_REPORT_ID, /* REPORT_ID (7) */
    
95.     0x09, 0x07, /* USAGE (ADC in) */
    
96.     0xb1, 0x82, /* FEATURE (Data,Var,Abs,Vol) */
    
97.     /* 161 */
    
98. 
    
99.   /* USER CODE END 0 */
    
100.   0xC0    /*     END_COLLECTION                 */
     
101.    
     
102. };

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