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
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
use crate::{Result, UsbDirection, UsbError};
use core::mem;
#[repr(u8)]
#[derive(Copy, Clone, Eq, PartialEq, Debug)]
pub enum RequestType {
Standard = 0,
Class = 1,
Vendor = 2,
Reserved = 3,
}
#[derive(Copy, Clone, Eq, PartialEq, Debug)]
pub enum Recipient {
Device = 0,
Interface = 1,
Endpoint = 2,
Other = 3,
Reserved = 4,
}
#[derive(Copy, Clone, Eq, PartialEq, Debug)]
pub struct Request {
pub direction: UsbDirection,
pub request_type: RequestType,
pub recipient: Recipient,
pub request: u8,
pub value: u16,
pub index: u16,
pub length: u16,
}
impl Request {
pub const GET_STATUS: u8 = 0;
pub const CLEAR_FEATURE: u8 = 1;
pub const SET_FEATURE: u8 = 3;
pub const SET_ADDRESS: u8 = 5;
pub const GET_DESCRIPTOR: u8 = 6;
pub const SET_DESCRIPTOR: u8 = 7;
pub const GET_CONFIGURATION: u8 = 8;
pub const SET_CONFIGURATION: u8 = 9;
pub const GET_INTERFACE: u8 = 10;
pub const SET_INTERFACE: u8 = 11;
pub const SYNCH_FRAME: u8 = 12;
pub const FEATURE_ENDPOINT_HALT: u16 = 0;
pub const FEATURE_DEVICE_REMOTE_WAKEUP: u16 = 1;
pub(crate) fn parse(buf: &[u8]) -> Result<Request> {
if buf.len() != 8 {
return Err(UsbError::ParseError);
}
let rt = buf[0];
let recipient = rt & 0b11111;
Ok(Request {
direction: rt.into(),
request_type: unsafe { mem::transmute((rt >> 5) & 0b11) },
recipient:
if recipient <= 3 { unsafe { mem::transmute(recipient) } }
else { Recipient::Reserved },
request: buf[1],
value: (buf[2] as u16) | ((buf[3] as u16) << 8),
index: (buf[4] as u16) | ((buf[5] as u16) << 8),
length: (buf[6] as u16) | ((buf[7] as u16) << 8),
})
}
pub fn descriptor_type_index(&self) -> (u8, u8) {
((self.value >> 8) as u8, self.value as u8)
}
}