-
Notifications
You must be signed in to change notification settings - Fork 17
/
usb-5.rs
244 lines (213 loc) · 8.74 KB
/
usb-5.rs
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
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
#![no_main]
#![no_std]
// this imports `src/lib.rs`to retrieve our global logger + panicking-behavior
use usb_app as _;
#[rtic::app(device = dk, peripherals = false)]
mod app {
use core::num::NonZeroU8;
use dk::{
peripheral::USBD,
usbd::{self, Ep0In, Event},
};
use usb2::{GetDescriptor as Descriptor, StandardRequest as Request, State};
#[local]
struct MyLocalResources {
usbd: USBD,
ep0in: Ep0In,
state: State,
}
#[shared]
struct MySharedResources {}
#[init]
fn init(_cx: init::Context) -> (MySharedResources, MyLocalResources, init::Monotonics) {
let board = dk::init().unwrap();
usbd::init(board.power, &board.usbd);
(
MySharedResources {},
MyLocalResources {
usbd: board.usbd,
ep0in: board.ep0in,
state: State::Default,
},
init::Monotonics(),
)
}
#[task(binds = USBD, local = [usbd, ep0in, state])]
fn main(cx: main::Context) {
let usbd = cx.local.usbd;
let ep0in = cx.local.ep0in;
let state = cx.local.state;
while let Some(event) = usbd::next_event(usbd) {
on_event(usbd, ep0in, state, event)
}
}
fn on_event(usbd: &USBD, ep0in: &mut Ep0In, state: &mut State, event: Event) {
defmt::println!("USB: {} @ {}", event, dk::uptime());
match event {
Event::UsbReset => {
defmt::println!("USB reset condition detected");
*state = State::Default;
}
Event::UsbEp0DataDone => {
defmt::println!("EP0IN: transfer complete");
ep0in.end(usbd);
}
Event::UsbEp0Setup => {
if ep0setup(usbd, ep0in, state).is_err() {
defmt::warn!("EP0IN: unexpected request; stalling the endpoint");
usbd::ep0stall(usbd);
}
}
}
}
/// The `bConfigurationValue` of the only supported configuration
const CONFIG_VAL: u8 = 42;
fn ep0setup(usbd: &USBD, ep0in: &mut Ep0In, state: &mut State) -> Result<(), ()> {
let bmrequesttype = usbd.bmrequesttype.read().bits() as u8;
let brequest = usbd.brequest.read().brequest().bits();
let wlength = usbd::wlength(usbd);
let windex = usbd::windex(usbd);
let wvalue = usbd::wvalue(usbd);
defmt::println!(
"bmrequesttype: {}, brequest: {}, wlength: {}, windex: {}, wvalue: {}",
bmrequesttype,
brequest,
wlength,
windex,
wvalue
);
let request = Request::parse(bmrequesttype, brequest, wvalue, windex, wlength)
.expect("Error parsing request");
defmt::println!("EP0: {}", defmt::Debug2Format(&request));
// ^^^^^^^^^^^^^^^^^^^ this adapter is currently needed to log
// `StandardRequest` with `defmt`
match request {
// section 9.4.3
// this request is valid in any state
Request::GetDescriptor {
descriptor: Descriptor::Device,
length,
} => {
let desc = usb2::device::Descriptor {
bDeviceClass: 0,
bDeviceProtocol: 0,
bDeviceSubClass: 0,
bMaxPacketSize0: usb2::device::bMaxPacketSize0::B64,
bNumConfigurations: core::num::NonZeroU8::new(1).unwrap(),
bcdDevice: 0x01_00, // 1.00
iManufacturer: None,
iProduct: None,
iSerialNumber: None,
idProduct: consts::USB_PID_RTIC_DEMO,
idVendor: consts::USB_VID_DEMO,
};
let bytes = desc.bytes();
ep0in.start(&bytes[..core::cmp::min(bytes.len(), length.into())], usbd);
}
Request::GetDescriptor {
descriptor: Descriptor::Configuration { index },
length,
} => {
if index == 0 {
let mut resp = heapless::Vec::<u8, 64>::new();
let conf_desc = usb2::configuration::Descriptor {
wTotalLength: (usb2::configuration::Descriptor::SIZE
+ usb2::interface::Descriptor::SIZE)
.into(),
bNumInterfaces: NonZeroU8::new(1).unwrap(),
bConfigurationValue: core::num::NonZeroU8::new(CONFIG_VAL).unwrap(),
iConfiguration: None,
bmAttributes: usb2::configuration::bmAttributes {
self_powered: true,
remote_wakeup: false,
},
bMaxPower: 250, // 500 mA
};
let iface_desc = usb2::interface::Descriptor {
bInterfaceNumber: 0,
bAlternativeSetting: 0,
bNumEndpoints: 0,
bInterfaceClass: 0,
bInterfaceSubClass: 0,
bInterfaceProtocol: 0,
iInterface: None,
};
resp.extend_from_slice(&conf_desc.bytes()).unwrap();
resp.extend_from_slice(&iface_desc.bytes()).unwrap();
ep0in.start(&resp[..core::cmp::min(resp.len(), length.into())], usbd);
} else {
// out of bounds access: stall the endpoint
return Err(());
}
}
Request::SetAddress { address } => {
match state {
State::Default => {
if let Some(address) = address {
*state = State::Address(address);
} else {
// stay in the `Default` state
}
}
State::Address(..) => {
if let Some(address) = address {
// use the new address
*state = State::Address(address);
} else {
*state = State::Default;
}
}
// unspecified behavior
State::Configured { .. } => return Err(()),
}
// the response to this request is handled in hardware
}
Request::SetConfiguration { value } => {
match *state {
// unspecified behavior
State::Default => return Err(()),
State::Address(address) => {
if let Some(value) = value {
if value.get() == CONFIG_VAL {
defmt::println!("entering the configured state");
*state = State::Configured { address, value };
} else {
defmt::error!("unsupported configuration value");
return Err(());
}
} else {
// stay in the address mode
}
}
State::Configured {
address,
value: curr_value,
} => {
if let Some(new_value) = value {
if new_value.get() == CONFIG_VAL {
if new_value != curr_value {
defmt::println!("changing configuration");
*state = State::Configured {
address,
value: new_value,
};
}
} else {
defmt::error!("unsupported configuration value");
return Err(());
}
} else {
defmt::println!("returned to the address state");
*state = State::Address(address);
}
}
}
usbd.tasks_ep0status
.write(|w| w.tasks_ep0status().set_bit());
}
// stall any other request
_ => return Err(()),
}
Ok(())
}
}