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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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<HTML
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>Diagnostic Support</TITLE
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><DIV
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><H1
CLASS="SECTION"
><A
NAME="HAL-DIAGNOSTIC-SUPPORT">Diagnostic Support</H1
><P
>The HAL provides support for low level diagnostic IO. This is
particularly useful during early development as an aid to bringing up
a new platform. Usually this diagnostic channel is a UART or some
other serial IO device, but it may equally be a a memory
buffer, a simulator supported output channel, a ROM emulator virtual
UART, and LCD panel, a memory mapped video buffer or any other output
device.</P
><P
><TT
CLASS="FUNCTION"
>HAL_DIAG_INIT()</TT
> performs any initialization
required on the device being used to generate diagnostic output. This
may include, for a UART, setting baud rate, and stop, parity and
character bits. For other devices it may include initializing a
controller or establishing contact with a remote device.</P
><P
><TT
CLASS="FUNCTION"
>HAL_DIAG_WRITE_CHAR(c)</TT
> writes
the character supplied to the diagnostic output device.</P
><P
><TT
CLASS="FUNCTION"
>HAL_DIAG_READ_CHAR(c)</TT
> reads a character from the
diagnostic device into the supplied variable. This is not supported
for all diagnostic devices.</P
><P
>These macros are defined in the header file
<TT
CLASS="FILENAME"
>cyg/hal/hal_diag.h</TT
>. This file is usually supplied
by the variant or platform HAL, depending on where the IO device being
used is located. For example for on-chip UARTs it would be in the
variant HAL, but for a board-level LCD panel it would be in the
platform HAL.</P
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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			`>Diagnostic Support</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="HAL Interfaces"`
23			`HREF="hal-interfaces.html"><LINK`
24			`REL="PREVIOUS"`
25			`TITLE="Linker Scripts"`
26			`HREF="hal-linker-scripts.html"><LINK`
27			`REL="NEXT"`
28			`TITLE="SMP Support"`
29			`HREF="hal-smp-support.html"></HEAD`
30			`><BODY`
31			`CLASS="SECTION"`
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="hal-linker-scripts.html"`
58			`ACCESSKEY="P"`
59			`>Prev</A`
60			`></TD`
61			`><TD`
62			`WIDTH="80%"`
63			`ALIGN="center"`
64			`VALIGN="bottom"`
65			`>Chapter 9. HAL Interfaces</TD`
66			`><TD`
67			`WIDTH="10%"`
68			`ALIGN="right"`
69			`VALIGN="bottom"`
70			`><A`
71			`HREF="hal-smp-support.html"`
72			`ACCESSKEY="N"`
73			`>Next</A`
74			`></TD`
75			`></TR`
76			`></TABLE`
77			`><HR`
78			`ALIGN="LEFT"`
79			`WIDTH="100%"></DIV`
80			`><DIV`
81			`CLASS="SECTION"`
82			`><H1`
83			`CLASS="SECTION"`
84			`><A`
85			`NAME="HAL-DIAGNOSTIC-SUPPORT">Diagnostic Support</H1`
86			`><P`
87			`>The HAL provides support for low level diagnostic IO. This is`
88			`particularly useful during early development as an aid to bringing up`
89			`a new platform. Usually this diagnostic channel is a UART or some`
90			`other serial IO device, but it may equally be a a memory`
91			`buffer, a simulator supported output channel, a ROM emulator virtual`
92			`UART, and LCD panel, a memory mapped video buffer or any other output`
93			`device.</P`
94			`><P`
95			`><TT`
96			`CLASS="FUNCTION"`
97			`>HAL_DIAG_INIT()</TT`
98			`> performs any initialization`
99			`required on the device being used to generate diagnostic output. This`
100			`may include, for a UART, setting baud rate, and stop, parity and`
101			`character bits. For other devices it may include initializing a`
102			`controller or establishing contact with a remote device.</P`
103			`><P`
104			`><TT`
105			`CLASS="FUNCTION"`
106			`>HAL_DIAG_WRITE_CHAR(c)</TT`
107			`> writes`
108			`the character supplied to the diagnostic output device.</P`
109			`><P`
110			`><TT`
111			`CLASS="FUNCTION"`
112			`>HAL_DIAG_READ_CHAR(c)</TT`
113			`> reads a character from the`
114			`diagnostic device into the supplied variable. This is not supported`
115			`for all diagnostic devices.</P`
116			`><P`
117			`>These macros are defined in the header file`
118			`<TT`
119			`CLASS="FILENAME"`
120			`>cyg/hal/hal_diag.h</TT`
121			`>. This file is usually supplied`
122			`by the variant or platform HAL, depending on where the IO device being`
123			`used is located. For example for on-chip UARTs it would be in the`
124			`variant HAL, but for a board-level LCD panel it would be in the`
125			`platform HAL.</P`
126			`></DIV`
127			`><DIV`
128			`CLASS="NAVFOOTER"`
129			`><HR`
130			`ALIGN="LEFT"`
131			`WIDTH="100%"><TABLE`
132			`SUMMARY="Footer navigation table"`
133			`WIDTH="100%"`
134			`BORDER="0"`
135			`CELLPADDING="0"`
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139			`WIDTH="33%"`
140			`ALIGN="left"`
141			`VALIGN="top"`
142			`><A`
143			`HREF="hal-linker-scripts.html"`
144			`ACCESSKEY="P"`
145			`>Prev</A`
146			`></TD`
147			`><TD`
148			`WIDTH="34%"`
149			`ALIGN="center"`
150			`VALIGN="top"`
151			`><A`
152			`HREF="ecos-ref.html"`
153			`ACCESSKEY="H"`
154			`>Home</A`
155			`></TD`
156			`><TD`
157			`WIDTH="33%"`
158			`ALIGN="right"`
159			`VALIGN="top"`
160			`><A`
161			`HREF="hal-smp-support.html"`
162			`ACCESSKEY="N"`
163			`>Next</A`
164			`></TD`
165			`></TR`
166			`><TR`
167			`><TD`
168			`WIDTH="33%"`
169			`ALIGN="left"`
170			`VALIGN="top"`
171			`>Linker Scripts</TD`
172			`><TD`
173			`WIDTH="34%"`
174			`ALIGN="center"`
175			`VALIGN="top"`
176			`><A`
177			`HREF="hal-interfaces.html"`
178			`ACCESSKEY="U"`
179			`>Up</A`
180			`></TD`
181			`><TD`
182			`WIDTH="33%"`
183			`ALIGN="right"`
184			`VALIGN="top"`
185			`>SMP Support</TD`
186			`></TR`
187			`></TABLE`
188			`></DIV`
189			`></BODY`
190			`></HTML`
191			`>`

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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [doc/] [html/] [ref/] [hal-diagnostic-support.html] - Blame information for rev 28