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
|
/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2026-present Eclipse ThreadX contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** USBX Component */
/** */
/** Device Stack */
/** */
/**************************************************************************/
/**************************************************************************/
#define UX_SOURCE_CODE
/* Include necessary system files. */
#include "ux_api.h"
#include "ux_device_stack.h"
#if defined(UX_DEVICE_STANDALONE)
#define UX_DEVICE_STACK_TRANSFER_STATE_HALT_WAIT (UX_STATE_STACK_STEP + 0)
#define UX_DEVICE_STACK_TRANSFER_STATE_TRAN_WAIT (UX_STATE_STACK_STEP + 1)
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_device_stack_transfer_run PORTABLE C */
/* 6.1.10 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function performs a USB transaction. On entry the */
/* transfer request gives the endpoint pipe selected for this */
/* transaction and the parameters associated with the transfer */
/* (data payload, length of transaction). */
/* */
/* It's for standalone mode. */
/* */
/* INPUT */
/* */
/* transfer_request Pointer to transfer request */
/* slave_length Length returned by host */
/* host_length Length asked by host */
/* */
/* OUTPUT */
/* */
/* State machine Status to check */
/* UX_STATE_NEXT Transfer done, to next state */
/* UX_STATE_EXIT Abnormal, to reset state */
/* (others) Keep running, waiting */
/* */
/* CALLS */
/* */
/* (ux_slave_dcd_function) Slave DCD dispatch function */
/* */
/* CALLED BY */
/* */
/* Application */
/* Device Stack */
/* */
/**************************************************************************/
UINT _ux_device_stack_transfer_run(UX_SLAVE_TRANSFER *transfer_request, ULONG slave_length, ULONG host_length)
{
UX_SLAVE_DCD *dcd;
UINT status;
UINT state;
UX_SLAVE_ENDPOINT *endpoint;
ULONG device_state;
/* Do we have to skip this transfer? */
if (transfer_request -> ux_slave_transfer_request_status_phase_ignore == UX_TRUE)
{
transfer_request -> ux_slave_transfer_request_completion_code = UX_SUCCESS;
transfer_request -> ux_slave_transfer_request_state = UX_STATE_NEXT;
return(UX_STATE_NEXT);
}
/* Get the device state. */
device_state = _ux_system_slave -> ux_system_slave_device.ux_slave_device_state;
/* We can only transfer when the device is ATTACHED, ADDRESSED OR CONFIGURED. */
if (!(device_state == UX_DEVICE_ATTACHED) &&
!(device_state == UX_DEVICE_ADDRESSED) &&
!(device_state == UX_DEVICE_CONFIGURED))
{
transfer_request -> ux_slave_transfer_request_completion_code = UX_TRANSFER_NOT_READY;
transfer_request -> ux_slave_transfer_request_state = UX_STATE_RESET;
return(UX_STATE_EXIT);
}
/* Get the pointer to the DCD. */
dcd = &_ux_system_slave -> ux_system_slave_dcd;
/* Get the endpoint associated with this transaction. */
endpoint = transfer_request -> ux_slave_transfer_request_endpoint;
/* Process states. */
state = transfer_request -> ux_slave_transfer_request_state;
switch(state)
{
case UX_STATE_RESET:
/* Prepare transfer parameters. */
/* If the endpoint is non Control, check the endpoint direction and set the data phase direction. */
if ((endpoint -> ux_slave_endpoint_descriptor.bmAttributes & UX_MASK_ENDPOINT_TYPE) != UX_CONTROL_ENDPOINT)
{
/* Isolate the direction from the endpoint address. */
if ((endpoint -> ux_slave_endpoint_descriptor.bEndpointAddress & UX_ENDPOINT_DIRECTION) == UX_ENDPOINT_IN)
transfer_request -> ux_slave_transfer_request_phase = UX_TRANSFER_PHASE_DATA_OUT;
else
transfer_request -> ux_slave_transfer_request_phase = UX_TRANSFER_PHASE_DATA_IN;
}
/* See if we need to force a zero length packet at the end of the transfer.
This happens on a DATA IN and when the host requested length is not met
and the last packet is on a boundary. If slave_length is zero, then it is
a explicit ZLP request, no need to force ZLP. */
if ((transfer_request -> ux_slave_transfer_request_phase == UX_TRANSFER_PHASE_DATA_OUT) &&
(slave_length != 0) && (host_length != slave_length) &&
(slave_length % endpoint -> ux_slave_endpoint_descriptor.wMaxPacketSize) == 0)
{
/* If so force Zero Length Packet. */
transfer_request -> ux_slave_transfer_request_force_zlp = UX_TRUE;
}
else
{
/* Condition is not met, do not force a Zero Length Packet. */
transfer_request -> ux_slave_transfer_request_force_zlp = UX_FALSE;
}
/* Reset the number of bytes sent/received. */
transfer_request -> ux_slave_transfer_request_actual_length = 0;
/* Determine how many bytes to send in this transaction. We keep track of the original
length and have a working length. */
transfer_request -> ux_slave_transfer_request_requested_length = slave_length;
transfer_request -> ux_slave_transfer_request_in_transfer_length = slave_length;
/* Save the buffer pointer. */
transfer_request -> ux_slave_transfer_request_current_data_pointer =
transfer_request -> ux_slave_transfer_request_data_pointer;
/* Set the transfer to pending. */
transfer_request -> ux_slave_transfer_request_status = UX_TRANSFER_STATUS_PENDING;
/* Next state. */
transfer_request -> ux_slave_transfer_request_state = UX_DEVICE_STACK_TRANSFER_STATE_HALT_WAIT;
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_DEVICE_STACK_TRANSFER_REQUEST, transfer_request, 0, 0, 0, UX_TRACE_DEVICE_STACK_EVENTS, 0, 0)
/* Fall through. */
case UX_DEVICE_STACK_TRANSFER_STATE_HALT_WAIT:
/* If the endpoint is non Control, check the endpoint direction and set the data phase direction. */
if ((endpoint -> ux_slave_endpoint_descriptor.bmAttributes & UX_MASK_ENDPOINT_TYPE) != UX_CONTROL_ENDPOINT)
{
/* Return WAIT until halt cleared. */
if (endpoint -> ux_slave_endpoint_state == UX_ENDPOINT_HALTED)
return(UX_STATE_WAIT);
}
/* Next state. */
transfer_request -> ux_slave_transfer_request_state = UX_DEVICE_STACK_TRANSFER_STATE_TRAN_WAIT;
/* Start background transfer immediately. */
/* Fall through. */
case UX_DEVICE_STACK_TRANSFER_STATE_TRAN_WAIT:
/* Call the DCD driver transfer function. */
/* Transfer state is adjusted inside DCD driver. */
status = dcd -> ux_slave_dcd_function(dcd, UX_DCD_TRANSFER_RUN, transfer_request);
/* Any error case or normal end: reset state for next transfer. */
if (status < UX_STATE_WAIT)
{
UX_SLAVE_TRANSFER_STATE_RESET(transfer_request);
}
break;
default: /* Error case, return EXIT. */
transfer_request -> ux_slave_transfer_request_state = UX_STATE_RESET;
return(UX_STATE_EXIT);
}
/* And return the status. */
return(status);
}
#endif
|
