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> TTY driver</TITLE
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>Chapter 16. Serial driver details</TD
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><DIV
CLASS="SECTION"
><H1
CLASS="SECTION"
><A
NAME="IO-TTY-DRIVER">TTY driver</H1
><P
>Use the include file <TT
CLASS="FILENAME"
><cyg/io/ttyio.h></TT
> for
this driver.</P
><P
>This driver is built on top of the simple
serial driver and is typically used for a device that interfaces with
humans such as a terminal. It provides some minimal formatting of data
on output and allows for line-oriented editing on input.</P
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN10715">Runtime configuration</H2
><P
>Runtime configuration is achieved by exchanging data structures with
the driver via the <TT
CLASS="FUNCTION"
>cyg_io_set_config()</TT
> and
<TT
CLASS="FUNCTION"
>cyg_io_get_config()</TT
> functions.</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>typedef struct {
cyg_uint32 tty_out_flags;
cyg_uint32 tty_in_flags;
} cyg_tty_info_t;</PRE
></TD
></TR
></TABLE
><P
>The field <TT
CLASS="STRUCTFIELD"
><I
>tty_out_flags</I
></TT
>
is used to control what happens to data as it is send to the serial
port. It contains a bitmap comprised of the bits as defined by the
<TT
CLASS="LITERAL"
>CYG_TTY_OUT_FLAGS_xxx</TT
> values below. </P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>#define CYG_TTY_OUT_FLAGS_CRLF 0x0001 // Map '\n' => '\n\r' on output</PRE
></TD
></TR
></TABLE
><P
>If this bit is set in <TT
CLASS="STRUCTFIELD"
><I
>tty_out_flags</I
></TT
>,
any occurrence of the character "\n" will
be replaced by the sequence "\n\r" before
being sent to the device.</P
><P
>The field <TT
CLASS="STRUCTFIELD"
><I
>tty_in_flags</I
></TT
>
is used to control how data is handled as it comes from the serial
port. It contains a bitmap comprised of the bits as defined by the
<TT
CLASS="LITERAL"
>CYG_TTY_IN_FLAGS_xxx</TT
> values below. </P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>#define CYG_TTY_IN_FLAGS_CR 0x0001 // Map '\r' => '\n' on input</PRE
></TD
></TR
></TABLE
><P
>If this bit is set in <TT
CLASS="STRUCTFIELD"
><I
>tty_in_flags</I
></TT
>, the
character "\r" (“return” or “enter” on
most keyboards) will be mapped to "\n".</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>#define CYG_TTY_IN_FLAGS_CRLF 0x0002 // Map '\n\r' => '\n' on input</PRE
></TD
></TR
></TABLE
><P
>If this bit is set in <TT
CLASS="STRUCTFIELD"
><I
>tty_in_flags</I
></TT
>, the
character sequence "\n\r" (often sent by DOS/Windows
based terminals) will be mapped to "\n". </P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>#define CYG_TTY_IN_FLAGS_BINARY 0x0004 // No input processing</PRE
></TD
></TR
></TABLE
><P
>If this bit is set in <TT
CLASS="STRUCTFIELD"
><I
>tty_in_flags</I
></TT
>, the
input will not be manipulated in any way before being placed in
the user’s buffer. </P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>#define CYG_TTY_IN_FLAGS_ECHO 0x0008 // Echo characters as processed</PRE
></TD
></TR
></TABLE
><P
>If this bit is set in <TT
CLASS="STRUCTFIELD"
><I
>tty_in_flags</I
></TT
>, characters
will be echoed back to the serial port as they are processed. </P
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN10742">API details</H2
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>cyg_io_read(handle, buf, len)</PRE
></TD
></TR
></TABLE
><P
>This function is used to read data from the device. In the
default case, data is read until an end-of-line character ("\n"
or "\r") is read. Additionally, the characters are echoed
back to the [terminal] device. Minimal editing
of the input is also supported. </P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>When connecting to a remote target via GDB it is not possible
to provide console input while GDB is connected. The GDB remote
protocol does not support input. Users must disconnect from GDB
if this functionality is required.</P
></BLOCKQUOTE
></DIV
><TABLE
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><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>
cyg_io_write(handle, buf, len)</PRE
></TD
></TR
></TABLE
><P
>This function is used to send data to the device. In the default
case, the end-of-line character "\n" is replaced by the
sequence "\n\r". </P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>cyg_io_get_config(handle, key, buf, len)</PRE
></TD
></TR
></TABLE
><P
>This function is used to get information about the channel’s
configuration at runtime. </P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="LITERAL"
>CYG_IO_GET_CONFIG_TTY_INFO</TT
></DT
><DD
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Buf type:</DT
><DD
><P
>cyg_tty_info_t</P
></DD
><DT
>Function:</DT
><DD
><P
>This function retrieves the current state of the
driver.
</P
></DD
></DL
></DIV
></DD
></DL
></DIV
><P
>Serial driver keys (see above) may also be specified
in which case the call is passed directly to the serial
driver. </P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>cyg_io_set_config(handle, key, buf, len)</PRE
></TD
></TR
></TABLE
><P
>This function is used to modify the channel’s configuration
at runtime. </P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="LITERAL"
>CYG_IO_SET_CONFIG_TTY_INFO</TT
></DT
><DD
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Buf type:</DT
><DD
><P
>cyg_tty_info_t</P
></DD
><DT
>Function:</DT
><DD
><P
>This function changes the current state of the
driver.</P
></DD
></DL
></DIV
></DD
></DL
></DIV
><P
>Serial driver
keys (see above) may also be specified in which case the
call is passed directly to the serial driver. </P
></DIV
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