OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [doc/] [html/] [ref/] [usbseth-host.html] - Blame information for rev 28

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 28 unneback 
<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
2 
<!-- This material may be distributed only subject to the terms      -->
3 
<!-- and conditions set forth in the Open Publication License, v1.0  -->
4 
<!-- or later (the latest version is presently available at          -->
5 
<!-- http://www.opencontent.org/openpub/).                           -->
6 
<!-- Distribution of the work or derivative of the work in any       -->
7 
<!-- standard (paper) book form is prohibited unless prior           -->
8 
<!-- permission is obtained from the copyright holder.               -->
9 
<HTML
10 
><HEAD
11 
><TITLE
12 
>Example Host-side Device Driver</TITLE
13 
><meta name="MSSmartTagsPreventParsing" content="TRUE">
14 
<META
15 
NAME="GENERATOR"
16 
CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
17 
"><LINK
18 
REL="HOME"
19 
TITLE="eCos Reference Manual"
20 
HREF="ecos-ref.html"><LINK
21 
REL="UP"
22 
TITLE="eCos Support for Developing USB-ethernet Peripherals"
23 
HREF="io-usb-slave-eth.html"><LINK
24 
REL="PREVIOUS"
25 
TITLE="Network Device for the eCos TCP/IP Stack"
26 
HREF="usbseth-netdev.html"><LINK
27 
REL="NEXT"
28 
TITLE="Communication Protocol"
29 
HREF="usbseth-protocol.html"></HEAD
30 
><BODY
31 
CLASS="REFENTRY"
32 
BGCOLOR="#FFFFFF"
33 
TEXT="#000000"
34 
LINK="#0000FF"
35 
VLINK="#840084"
36 
ALINK="#0000FF"
37 
><DIV
38 
CLASS="NAVHEADER"
39 
><TABLE
40 
SUMMARY="Header navigation table"
41 
WIDTH="100%"
42 
BORDER="0"
43 
CELLPADDING="0"
44 
CELLSPACING="0"
45 
><TR
46 
><TH
47 
COLSPAN="3"
48 
ALIGN="center"
49 
>eCos Reference Manual</TH
50 
></TR
51 
><TR
52 
><TD
53 
WIDTH="10%"
54 
ALIGN="left"
55 
VALIGN="bottom"
56 
><A
57 
HREF="usbseth-netdev.html"
58 
ACCESSKEY="P"
59 
>Prev</A
60 
></TD
61 
><TD
62 
WIDTH="80%"
63 
ALIGN="center"
64 
VALIGN="bottom"
65 
></TD
66 
><TD
67 
WIDTH="10%"
68 
ALIGN="right"
69 
VALIGN="bottom"
70 
><A
71 
HREF="usbseth-protocol.html"
72 
ACCESSKEY="N"
73 
>Next</A
74 
></TD
75 
></TR
76 
></TABLE
77 
><HR
78 
ALIGN="LEFT"
79 
WIDTH="100%"></DIV
80 
><H1
81 
><A
82 
NAME="USBSETH-HOST">Example Host-side Device Driver</H1
83 
><DIV
84 
CLASS="REFNAMEDIV"
85 
><A
86 
NAME="AEN17593"
87 
></A
88 
><H2
89 
>Name</H2
90 
>Example Host-side Device Driver&nbsp;--&nbsp;Provide host-side support for the eCos USB-ethernet package</DIV
91 
><DIV
92 
CLASS="REFSECT1"
93 
><A
94 
NAME="AEN17596"
95 
></A
96 
><H2
97 
>Description</H2
98 
><P
99 
>The USB-ethernet package is supplied with a single host-side device
100 
driver. This driver has been developed against the Linux kernel
101 
2.2.16-22, as shipped with Red Hat 7. The driver is provided as is and
102 
should not be considered production quality: for example it only
103 
checks for a bogus vendor id <TT
104 
CLASS="LITERAL"
105 
>0x4242</TT
106 
> rather than an
107 
official vendor id supplied by the <A
108 
HREF="http://www.usb.org/"
109 
TARGET="_top"
110 
>USB Implementers Forum</A
111 
>. Also, if the
112 
peripheral involves multiple configurations or multiple interfaces, it
113 
will fail to detect this. However, the driver can be used for simple
114 
testing and as the basis of a full device driver. Details of the
115 
protocol used between host and peripheral can be found in the <A
116 
HREF="usbseth-protocol.html"
117 
>Communication Protocol</A
118 
> section.</P
119 
><P
120 
>The host-side device driver can be found in the <TT
121 
CLASS="FILENAME"
122 
>host</TT
123 
> subdirectory of the USB-ethernet
124 
package, specifically the file <TT
125 
CLASS="FILENAME"
126 
>ecos_usbeth.c</TT
127 
>, and
128 
comes with a <TT
129 
CLASS="FILENAME"
130 
>Makefile</TT
131 
>. Both files may need
132 
to be modified for specific applications. For example, the vendor id
133 
table <TT
134 
CLASS="LITERAL"
135 
>ecos_usbeth_implementations</TT
136 
> may need to be
137 
updated for the specific USB peripheral being built. The
138 
<TT
139 
CLASS="FILENAME"
140 
>Makefile</TT
141 
> assumes that the Linux kernel sources
142 
reside in <TT
143 
CLASS="FILENAME"
144 
>/usr/src/linux</TT
145 
>, and
146 
that the kernel has already been configured and built. Assuming this
147 
is the case, the device driver can be built simply by invoking
148 
<B
149 
CLASS="COMMAND"
150 
>make</B
151 
> with no additional arguments. This will result
152 
in a dynamically loadable kernel module,
153 
<TT
154 
CLASS="FILENAME"
155 
>ecos_usbeth.o</TT
156 
>, in the current directory.</P
157 
><DIV
158 
CLASS="NOTE"
159 
><BLOCKQUOTE
160 
CLASS="NOTE"
161 
><P
162 
><B
163 
>Note: </B
164 
>As normal for Linux kernel builds, the generated files such as
165 
<TT
166 
CLASS="FILENAME"
167 
>ecos_usbeth.o</TT
168 
> live in the same directory as the
169 
source tree. This is very different from eCos where the source tree
170 
(or component repository) is kept separate from any builds. There may
171 
be problems if the component repository is kept read-only or if it is
172 
put under source code control. Any such problems can be avoided by
173 
making a copy of the <TT
174 
CLASS="FILENAME"
175 
>host</TT
176 
>
177 
subdirectory and building that copy.</P
178 
></BLOCKQUOTE
179 
></DIV
180 
><P
181 
>Loading the kernel module into the current system requires root
182 
privileges. If the generic USB support is also a loadable module and
183 
has not been loaded already, this must happen first:</P
184 
><TABLE
185 
BORDER="5"
186 
BGCOLOR="#E0E0F0"
187 
WIDTH="70%"
188 
><TR
189 
><TD
190 
><PRE
191 
CLASS="SCREEN"
192 
># insmod usb-uhci
193 
Using /lib/modules/2.2.16-22/usb/usb-uhci.o</PRE
194 
></TD
195 
></TR
196 
></TABLE
197 
><P
198 
>Depending on the host hardware, the <TT
199 
CLASS="LITERAL"
200 
>uhci</TT
201 
> or
202 
<TT
203 
CLASS="LITERAL"
204 
>usb-ohci</TT
205 
> modules may be more appropriate. Loading
206 
the generic USB module will typically result in a number of messages
207 
to the logfile <TT
208 
CLASS="FILENAME"
209 
>/var/log/messages</TT
210 
>, giving details
211 
of the specific host-side hardware that has been detected plus any
212 
hubs. The next step is to load the USB-ethernet module:</P
213 
><TABLE
214 
BORDER="5"
215 
BGCOLOR="#E0E0F0"
216 
WIDTH="70%"
217 
><TR
218 
><TD
219 
><PRE
220 
CLASS="SCREEN"
221 
># insmod ecos_usbeth.o</PRE
222 
></TD
223 
></TR
224 
></TABLE
225 
><P
226 
>This should result in a number of additional diagnostics in the
227 
logfile:</P
228 
><TABLE
229 
BORDER="5"
230 
BGCOLOR="#E0E0F0"
231 
WIDTH="70%"
232 
><TR
233 
><TD
234 
><PRE
235 
CLASS="SCREEN"
236 
>Apr 1 18:01:08 grumpy kernel: eCos USB-ethernet device driver
237 
Apr 1 18:01:08 grumpy kernel: usb.c: registered new driver ecos_usbeth</PRE
238 
></TD
239 
></TR
240 
></TABLE
241 
><P
242 
>If a suitable USB peripheral is now connected the host will detect
243 
this, assign an address in the local USB network, obtain enumeration
244 
data, and find a suitable device driver. Assuming the peripheral and
245 
device driver agree on the supported vendor ids, the
246 
<TT
247 
CLASS="FILENAME"
248 
>ecos_usbeth.o</TT
249 
> module will be selected and this
250 
will be reported in the system log:</P
251 
><TABLE
252 
BORDER="5"
253 
BGCOLOR="#E0E0F0"
254 
WIDTH="70%"
255 
><TR
256 
><TD
257 
><PRE
258 
CLASS="SCREEN"
259 
>Apr 1 18:04:12 grumpy kernel: usb.c: USB new device connect, assigned device number 3
260 
Apr 1 18:04:12 grumpy kernel: eCos-based USB ethernet peripheral active at eth1</PRE
261 
></TD
262 
></TR
263 
></TABLE
264 
><P
265 
>What can happen next depends very much on the software that is running
266 
on top of the USB-ethernet package inside the peripheral. For example,
267 
if there is a TCP/IP stack then it should be possible to bring up a
268 
network connection between host and peripheral using
269 
<B
270 
CLASS="COMMAND"
271 
>ifconfig</B
272 
>.</P
273 
></DIV
274 
><DIV
275 
CLASS="NAVFOOTER"
276 
><HR
277 
ALIGN="LEFT"
278 
WIDTH="100%"><TABLE
279 
SUMMARY="Footer navigation table"
280 
WIDTH="100%"
281 
BORDER="0"
282 
CELLPADDING="0"
283 
CELLSPACING="0"
284 
><TR
285 
><TD
286 
WIDTH="33%"
287 
ALIGN="left"
288 
VALIGN="top"
289 
><A
290 
HREF="usbseth-netdev.html"
291 
ACCESSKEY="P"
292 
>Prev</A
293 
></TD
294 
><TD
295 
WIDTH="34%"
296 
ALIGN="center"
297 
VALIGN="top"
298 
><A
299 
HREF="ecos-ref.html"
300 
ACCESSKEY="H"
301 
>Home</A
302 
></TD
303 
><TD
304 
WIDTH="33%"
305 
ALIGN="right"
306 
VALIGN="top"
307 
><A
308 
HREF="usbseth-protocol.html"
309 
ACCESSKEY="N"
310 
>Next</A
311 
></TD
312 
></TR
313 
><TR
314 
><TD
315 
WIDTH="33%"
316 
ALIGN="left"
317 
VALIGN="top"
318 
>Network Device for the eCos TCP/IP Stack</TD
319 
><TD
320 
WIDTH="34%"
321 
ALIGN="center"
322 
VALIGN="top"
323 
><A
324 
HREF="io-usb-slave-eth.html"
325 
ACCESSKEY="U"
326 
>Up</A
327 
></TD
328 
><TD
329 
WIDTH="33%"
330 
ALIGN="right"
331 
VALIGN="top"
332 
>Communication Protocol</TD
333 
></TR
334 
></TABLE
335 
></DIV
336 
></BODY
337 
></HTML
338 
>

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.