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>Diagnostic Support</TITLE
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>Diagnostic Support</TITLE
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>eCos Reference Manual</TH
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>Chapter 9. HAL Interfaces</TD
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>Chapter 9. HAL Interfaces</TD
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NAME="HAL-DIAGNOSTIC-SUPPORT">Diagnostic Support</H1
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NAME="HAL-DIAGNOSTIC-SUPPORT">Diagnostic Support</H1
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><P
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><P
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>The HAL provides support for low level diagnostic IO. This is
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>The HAL provides support for low level diagnostic IO. This is
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particularly useful during early development as an aid to bringing up
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particularly useful during early development as an aid to bringing up
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a new platform. Usually this diagnostic channel is a UART or some
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a new platform. Usually this diagnostic channel is a UART or some
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other serial IO device, but it may equally be a a memory
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other serial IO device, but it may equally be a a memory
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buffer, a simulator supported output channel, a ROM emulator virtual
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buffer, a simulator supported output channel, a ROM emulator virtual
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UART, and LCD panel, a memory mapped video buffer or any other output
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UART, and LCD panel, a memory mapped video buffer or any other output
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device.</P
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device.</P
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><P
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><P
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><TT
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><TT
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CLASS="FUNCTION"
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CLASS="FUNCTION"
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>HAL_DIAG_INIT()</TT
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>HAL_DIAG_INIT()</TT
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> performs any initialization
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> performs any initialization
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required on the device being used to generate diagnostic output. This
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required on the device being used to generate diagnostic output. This
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may include, for a UART, setting baud rate, and stop, parity and
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may include, for a UART, setting baud rate, and stop, parity and
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character bits. For other devices it may include initializing a
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character bits. For other devices it may include initializing a
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controller or establishing contact with a remote device.</P
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controller or establishing contact with a remote device.</P
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><P
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><P
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><TT
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><TT
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CLASS="FUNCTION"
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CLASS="FUNCTION"
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>HAL_DIAG_WRITE_CHAR(c)</TT
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>HAL_DIAG_WRITE_CHAR(c)</TT
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> writes
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> writes
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the character supplied to the diagnostic output device.</P
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the character supplied to the diagnostic output device.</P
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><P
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><P
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><TT
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><TT
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CLASS="FUNCTION"
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CLASS="FUNCTION"
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>HAL_DIAG_READ_CHAR(c)</TT
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>HAL_DIAG_READ_CHAR(c)</TT
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> reads a character from the
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> reads a character from the
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diagnostic device into the supplied variable. This is not supported
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diagnostic device into the supplied variable. This is not supported
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for all diagnostic devices.</P
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for all diagnostic devices.</P
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><P
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><P
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>These macros are defined in the header file
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>These macros are defined in the header file
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<TT
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<TT
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CLASS="FILENAME"
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CLASS="FILENAME"
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>cyg/hal/hal_diag.h</TT
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>cyg/hal/hal_diag.h</TT
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>. This file is usually supplied
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>. This file is usually supplied
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by the variant or platform HAL, depending on where the IO device being
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by the variant or platform HAL, depending on where the IO device being
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used is located. For example for on-chip UARTs it would be in the
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used is located. For example for on-chip UARTs it would be in the
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variant HAL, but for a board-level LCD panel it would be in the
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variant HAL, but for a board-level LCD panel it would be in the
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platform HAL.</P
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platform HAL.</P
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