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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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><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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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [doc/] [html/] [ref/] [hal-diagnostic-support.html] - Rev 441