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

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [doc/] [html/] [ref/] [hal-diagnostic-support.html] - Rev 588

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

<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
<!-- This material may be distributed only subject to the terms      -->
<!-- and conditions set forth in the Open Publication License, v1.0  -->
<!-- or later (the latest version is presently available at          -->
<!-- http://www.opencontent.org/openpub/).                           -->
<!-- Distribution of the work or derivative of the work in any       -->
<!-- standard (paper) book form is prohibited unless prior           -->
<!-- permission is obtained from the copyright holder.               -->
<HTML
><HEAD
><TITLE
>Diagnostic Support</TITLE
><meta name="MSSmartTagsPreventParsing" content="TRUE">
<META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
"><LINK
REL="HOME"
TITLE="eCos Reference Manual"
HREF="ecos-ref.html"><LINK
REL="UP"
TITLE="HAL Interfaces"
HREF="hal-interfaces.html"><LINK
REL="PREVIOUS"
TITLE="Linker Scripts"
HREF="hal-linker-scripts.html"><LINK
REL="NEXT"
TITLE="SMP Support"
HREF="hal-smp-support.html"></HEAD
><BODY
CLASS="SECTION"
BGCOLOR="#FFFFFF"
TEXT="#000000"
LINK="#0000FF"
VLINK="#840084"
ALINK="#0000FF"
><DIV
CLASS="NAVHEADER"
><TABLE
SUMMARY="Header navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TH
COLSPAN="3"
ALIGN="center"
>eCos Reference Manual</TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="bottom"
><A
HREF="hal-linker-scripts.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="80%"
ALIGN="center"
VALIGN="bottom"
>Chapter 9. HAL Interfaces</TD
><TD
WIDTH="10%"
ALIGN="right"
VALIGN="bottom"
><A
HREF="hal-smp-support.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><DIV
CLASS="SECTION"
><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
></DIV
><DIV
CLASS="NAVFOOTER"
><HR
ALIGN="LEFT"
WIDTH="100%"><TABLE
SUMMARY="Footer navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><A
HREF="hal-linker-scripts.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="ecos-ref.html"
ACCESSKEY="H"
>Home</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><A
HREF="hal-smp-support.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>Linker Scripts</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="hal-interfaces.html"
ACCESSKEY="U"
>Up</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
>SMP Support</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>

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

Browse

Tools

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [doc/] [html/] [ref/] [hal-diagnostic-support.html] - Rev 588