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-<!-- 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
->Serial driver details</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="I/O Package (Device Drivers)"
-HREF="io.html"><LINK
-REL="PREVIOUS"
-TITLE="User API"
-HREF="io-user-api.html"><LINK
-REL="NEXT"
-TITLE=" TTY driver"
-HREF="io-tty-driver.html"></HEAD
-><BODY
-CLASS="CHAPTER"
-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="io-user-api.html"
-ACCESSKEY="P"
->Prev</A
-></TD
-><TD
-WIDTH="80%"
-ALIGN="center"
-VALIGN="bottom"
-></TD
-><TD
-WIDTH="10%"
-ALIGN="right"
-VALIGN="bottom"
-><A
-HREF="io-tty-driver.html"
-ACCESSKEY="N"
->Next</A
-></TD
-></TR
-></TABLE
-><HR
-ALIGN="LEFT"
-WIDTH="100%"></DIV
-><DIV
-CLASS="CHAPTER"
-><H1
-><A
-NAME="IO-SERIAL-DRIVER-DETAILS">Chapter 16. Serial driver details</H1
-><DIV
-CLASS="TOC"
-><DL
-><DT
-><B
->Table of Contents</B
-></DT
-><DT
-><A
-HREF="io-serial-driver-details.html#IO-SIMPLE-SERIAL-DRIVER"
->Raw Serial Driver</A
-></DT
-><DT
-><A
-HREF="io-tty-driver.html"
->TTY driver</A
-></DT
-></DL
-></DIV
-><P
->Two different classes of serial drivers are provided as a standard
-part of the eCos system. These are described as &#8220;raw
-serial&#8221; (serial) and &#8220;tty-like&#8221; (tty).</P
-><DIV
-CLASS="SECTION"
-><H1
-CLASS="SECTION"
-><A
-NAME="IO-SIMPLE-SERIAL-DRIVER">Raw Serial Driver</H1
-><P
->Use the include file <TT
-CLASS="FILENAME"
->&lt;cyg/io/serialio.h&gt;</TT
-> for
-this driver.</P
-><P
->The raw serial driver is capable of sending
-and receiving blocks of raw data to a serial device. Controls are
-provided to configure the actual hardware, but there is no manipulation
-of the data by this driver.</P
-><P
->There may be many instances of this driver in a given system,
-one for each serial channel. Each channel corresponds to a physical
-device and there will typically be a device module created for this
-purpose. The device modules themselves are configurable, allowing
-specification of the actual hardware details, as well as such details
-as whether the channel should be buffered by the serial driver,
-etc.</P
-><DIV
-CLASS="SECTION"
-><H2
-CLASS="SECTION"
-><A
-NAME="AEN10475">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_serial_baud_rate_t baud;
- cyg_serial_stop_bits_t stop;
- cyg_serial_parity_t parity;
- cyg_serial_word_length_t word_length;
- cyg_uint32 flags;
-} cyg_serial_info_t;</PRE
-></TD
-></TR
-></TABLE
-><P
->The field <TT
-CLASS="STRUCTFIELD"
-><I
->word_length</I
-></TT
-> contains the number of data bits per word
-(character). This must be one of the values:</P
-><TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
-> CYGNUM_SERIAL_WORD_LENGTH_5
- CYGNUM_SERIAL_WORD_LENGTH_6
- CYGNUM_SERIAL_WORD_LENGTH_7
- CYGNUM_SERIAL_WORD_LENGTH_8</PRE
-></TD
-></TR
-></TABLE
-><P
->The field <TT
-CLASS="STRUCTFIELD"
-><I
->baud</I
-></TT
-> contains a baud rate selection.  This must be
-one of the values:</P
-><TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
-> CYGNUM_SERIAL_BAUD_50
- CYGNUM_SERIAL_BAUD_75
- CYGNUM_SERIAL_BAUD_110
- CYGNUM_SERIAL_BAUD_134_5
- CYGNUM_SERIAL_BAUD_150
- CYGNUM_SERIAL_BAUD_200
- CYGNUM_SERIAL_BAUD_300
- CYGNUM_SERIAL_BAUD_600
- CYGNUM_SERIAL_BAUD_1200
- CYGNUM_SERIAL_BAUD_1800
- CYGNUM_SERIAL_BAUD_2400
- CYGNUM_SERIAL_BAUD_3600
- CYGNUM_SERIAL_BAUD_4800
- CYGNUM_SERIAL_BAUD_7200
- CYGNUM_SERIAL_BAUD_9600
- CYGNUM_SERIAL_BAUD_14400
- CYGNUM_SERIAL_BAUD_19200
- CYGNUM_SERIAL_BAUD_38400
- CYGNUM_SERIAL_BAUD_57600
- CYGNUM_SERIAL_BAUD_115200
- CYGNUM_SERIAL_BAUD_234000</PRE
-></TD
-></TR
-></TABLE
-><P
->The field <TT
-CLASS="STRUCTFIELD"
-><I
->stop</I
-></TT
-> contains the number of stop bits. This must be
-one of the values:</P
-><TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
-> CYGNUM_SERIAL_STOP_1
- CYGNUM_SERIAL_STOP_1_5
- CYGNUM_SERIAL_STOP_2</PRE
-></TD
-></TR
-></TABLE
-><DIV
-CLASS="NOTE"
-><BLOCKQUOTE
-CLASS="NOTE"
-><P
-><B
->Note: </B
->On most hardware, a selection of 1.5 stop bits is only valid
-if the word (character) length is 5.</P
-></BLOCKQUOTE
-></DIV
-><P
->The field <TT
-CLASS="STRUCTFIELD"
-><I
->parity</I
-></TT
-> contains the parity mode.  This must be one of
-the values: </P
-><TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
-> CYGNUM_SERIAL_PARITY_NONE
- CYGNUM_SERIAL_PARITY_EVEN
- CYGNUM_SERIAL_PARITY_ODD
- CYGNUM_SERIAL_PARITY_MARK
- CYGNUM_SERIAL_PARITY_SPACE</PRE
-></TD
-></TR
-></TABLE
-><P
->The field <TT
-CLASS="STRUCTFIELD"
-><I
->flags</I
-></TT
-> is a bitmask which controls the behavior of the
-serial device driver. It should be built from the values
-<TT
-CLASS="LITERAL"
->CYG_SERIAL_FLAGS_xxx</TT
-> defined below:</P
-><TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
->#define CYG_SERIAL_FLAGS_RTSCTS 0x0001</PRE
-></TD
-></TR
-></TABLE
-><P
->If this bit is set then the port is placed in &#8220;hardware
-handshake&#8221; mode. In this mode, the CTS and RTS pins control
-when data is allowed to be sent/received at the port. This
-bit is ignored if the hardware does not support this level of
-handshake.</P
-><TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
->typedef struct {
-  cyg_int32 rx_bufsize;
-  cyg_int32 rx_count;
-  cyg_int32 tx_bufsize;
-  cyg_int32 tx_count;
-} cyg_serial_buf_info_t;     </PRE
-></TD
-></TR
-></TABLE
-><P
->The field <TT
-CLASS="STRUCTFIELD"
-><I
->rx_bufsize</I
-></TT
-> contains
-the total size of the incoming data buffer. This is set to zero on
-devices that do not support buffering (i.e. polled devices).</P
-><P
->The field <TT
-CLASS="STRUCTFIELD"
-><I
->rx_count</I
-></TT
-> contains the
-number of bytes currently occupied in the incoming data buffer.
-This is set to zero on devices that do not support buffering (i.e. polled
-devices).</P
-><P
->The field <TT
-CLASS="STRUCTFIELD"
-><I
->tx_bufsize</I
-></TT
-> contains the
-total size of the transmit data buffer. This is set to zero on devices
-that do not support buffering (i.e. polled devices).</P
-><P
->The field <TT
-CLASS="STRUCTFIELD"
-><I
->tx_count</I
-></TT
-> contains the
-number of bytes currently occupied in the transmit data buffer.  This
-is set to zero on devices that do not support buffering (i.e. polled
-devices).</P
-></DIV
-><DIV
-CLASS="SECTION"
-><H2
-CLASS="SECTION"
-><A
-NAME="AEN10510">API Details</H2
-><DIV
-CLASS="SECTION"
-><H3
-CLASS="SECTION"
-><A
-NAME="IO-SERIAL-CYG-IO-WRITE">cyg_io_write</H3
-><TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
->cyg_io_write(handle, buf, len)</PRE
-></TD
-></TR
-></TABLE
-><P
->Send the data from <TT
-CLASS="PARAMETER"
-><I
->buf</I
-></TT
-> to the device. The
-driver maintains a buffer to hold the data. The size of the
-intermediate buffer is configurable within the interface module. The
-data is not modified at all while it is being buffered. On return,
-<TT
-CLASS="PARAMETER"
-><I
->*len</I
-></TT
-> contains the amount of characters actually
-consumed .</P
-><P
->It is possible to configure the write call to be blocking
-(default) or non-blocking. Non-blocking mode requires both the configuration
-option <TT
-CLASS="LITERAL"
->CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING</TT
->
-to be enabled, and the specific device to be set to non-blocking
-mode for writes (see <TT
-CLASS="FUNCTION"
->cyg_io_set_config()</TT
->).</P
-><P
->In blocking mode, the call will not return until there is space in the
-buffer and the entire contents of <TT
-CLASS="PARAMETER"
-><I
->buf</I
-></TT
-> have been
-consumed.</P
-><P
->In non-blocking mode, as much as possible gets consumed from
-<TT
-CLASS="PARAMETER"
-><I
->buf</I
-></TT
->. If everything was consumed, the call
-returns <TT
-CLASS="LITERAL"
->ENOERR</TT
->. If only part of the
-<TT
-CLASS="PARAMETER"
-><I
->buf</I
-></TT
-> contents was consumed,
-<TT
-CLASS="LITERAL"
->-EAGAIN</TT
-> is returned and the caller must try
-again. On return, <TT
-CLASS="PARAMETER"
-><I
->*len</I
-></TT
-> contains the number of characters actually
-consumed .</P
-><P
->The call can also return <TT
-CLASS="LITERAL"
->-EINTR</TT
-> if interrupted
-via the <TT
-CLASS="FUNCTION"
->cyg_io_get_config()</TT
->/<TT
-CLASS="LITERAL"
->ABORT</TT
-> key.</P
-></DIV
-><DIV
-CLASS="SECTION"
-><H3
-CLASS="SECTION"
-><A
-NAME="IO-SERIAL-CYG-IO-READ">cyg_io_read</H3
-><TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
->cyg_io_read(handle, buf, len)</PRE
-></TD
-></TR
-></TABLE
-><P
->Receive data into the buffer, <TT
-CLASS="PARAMETER"
-><I
->buf</I
-></TT
->, from the
-device. No manipulation of the data is performed before being
-transferred.  An interrupt driven interface module will support data
-arriving when no read is pending by buffering the data in the serial
-driver.  Again, this buffering is completely configurable. On return,
-<TT
-CLASS="PARAMETER"
-><I
->*len</I
-></TT
-> contains the number of characters actually
-received.</P
-><P
->It is possible to configure the read call to be blocking (default)
-or  non-blocking. Non-blocking mode requires both the configuration
-option  <TT
-CLASS="LITERAL"
->CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING</TT
->
-to be enabled, and the specific device to be set to non-blocking
-mode for reads (see <TT
-CLASS="FUNCTION"
->cyg_io_set_config()</TT
->).</P
-><P
->In blocking mode, the call will not return until the requested
-amount of data has been read.</P
-><P
->In non-blocking mode, data waiting in the device buffer is copied to
-<TT
-CLASS="PARAMETER"
-><I
->buf</I
-></TT
->, and the call returns immediately. If there
-was enough data in the buffer to fulfill the request,
-<TT
-CLASS="LITERAL"
->ENOERR</TT
-> is returned.  If only part of the request
-could be fulfilled, <TT
-CLASS="LITERAL"
->-EAGAIN</TT
-> is returned and the
-caller must try again. On return, <TT
-CLASS="PARAMETER"
-><I
->*len</I
-></TT
-> contains
-the number of characters actually received.</P
-><P
->The call can also return <TT
-CLASS="LITERAL"
->-EINTR</TT
-> if interrupted via
-the <TT
-CLASS="FUNCTION"
->cyg_io_get_config()</TT
->/<TT
-CLASS="LITERAL"
->ABORT</TT
->
-key.</P
-></DIV
-><DIV
-CLASS="SECTION"
-><H3
-CLASS="SECTION"
-><A
-NAME="IO-SERIAL-CYG-GET-CONFIG">cyg_io_get_config</H3
-><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 returns current [runtime] information
-about the device and/or driver. </P
-><P
-></P
-><DIV
-CLASS="VARIABLELIST"
-><DL
-><DT
-><TT
-CLASS="LITERAL"
->CYG_IO_GET_CONFIG_SERIAL_INFO</TT
-></DT
-><DD
-><P
-></P
-><DIV
-CLASS="VARIABLELIST"
-><DL
-><DT
->Buf type:</DT
-><DD
-><P
->cyg_serial_info_t</P
-></DD
-><DT
->Function:</DT
-><DD
-><P
->              This function retrieves the current state of the driver
-              and hardware. This information contains fields for
-              hardware baud rate, number of stop bits, and parity
-              mode. It also includes a set of flags that control the
-              port, such as hardware flow control.
-            </P
-></DD
-></DL
-></DIV
-></DD
-><DT
-><TT
-CLASS="LITERAL"
->CYG_IO_GET_CONFIG_SERIAL_BUFFER_INFO</TT
-></DT
-><DD
-><P
-></P
-><DIV
-CLASS="VARIABLELIST"
-><DL
-><DT
->Buf type:</DT
-><DD
-><P
->cyg_serial_buf_info_t</P
-></DD
-><DT
->Function:</DT
-><DD
-><P
->               This function retrieves the current state of the
-               software buffers in the serial drivers. For both
-               receive and transmit buffers it returns the total
-               buffer size and the current number of bytes occupied in
-               the buffer. It does not take into account any buffering
-               such as FIFOs or holding registers that the serial
-               device itself may have.
-             </P
-></DD
-></DL
-></DIV
-></DD
-><DT
-><TT
-CLASS="LITERAL"
->CYG_IO_GET_CONFIG_SERIAL_OUTPUT_DRAIN</TT
-></DT
-><DD
-><P
-></P
-><DIV
-CLASS="VARIABLELIST"
-><DL
-><DT
->Buf type:</DT
-><DD
-><P
->void *</P
-></DD
-><DT
->Function:</DT
-><DD
-><P
->              This function waits for any buffered output to
-              complete. This function only completes when there is no
-              more data remaining to be sent to the device.
-            </P
-></DD
-></DL
-></DIV
-></DD
-><DT
-><TT
-CLASS="LITERAL"
->CYG_IO_GET_CONFIG_SERIAL_OUTPUT_FLUSH</TT
-></DT
-><DD
-><P
-></P
-><DIV
-CLASS="VARIABLELIST"
-><DL
-><DT
->Buf type:</DT
-><DD
-><P
->void *</P
-></DD
-><DT
->Function:</DT
-><DD
-><P
->              This function discards any buffered output for the
-             device.
-            </P
-></DD
-></DL
-></DIV
-></DD
-><DT
-><TT
-CLASS="LITERAL"
->CYG_IO_GET_CONFIG_SERIAL_INPUT_DRAIN</TT
-></DT
-><DD
-><P
-></P
-><DIV
-CLASS="VARIABLELIST"
-><DL
-><DT
->Buf type:</DT
-><DD
-><P
->void *</P
-></DD
-><DT
->Function:</DT
-><DD
-><P
->This function discards any buffered input for the
-            device.</P
-></DD
-></DL
-></DIV
-></DD
-><DT
-><TT
-CLASS="LITERAL"
->CYG_IO_GET_CONFIG_SERIAL_ABORT</TT
-></DT
-><DD
-><P
-></P
-><DIV
-CLASS="VARIABLELIST"
-><DL
-><DT
->Buf type:</DT
-><DD
-><P
-> void*</P
-></DD
-><DT
->Function:</DT
-><DD
-><P
->This function will cause any pending read or write calls on
-            this device to return with <TT
-CLASS="LITERAL"
->-EABORT</TT
->.</P
-></DD
-></DL
-></DIV
-></DD
-><DT
-><TT
-CLASS="LITERAL"
->CYG_IO_GET_CONFIG_SERIAL_READ_BLOCKING</TT
-></DT
-><DD
-><P
-></P
-><DIV
-CLASS="VARIABLELIST"
-><DL
-><DT
->Buf type:</DT
-><DD
-><P
-> cyg_uint32 (values 0 or 1)</P
-></DD
-><DT
->Function:</DT
-><DD
-><P
->This function will read back the blocking-mode
-            setting for read calls on this device. This call is only
-            available if the configuration option
-            <TT
-CLASS="LITERAL"
->CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING</TT
-> is
-            enabled.</P
-></DD
-></DL
-></DIV
-></DD
-><DT
-><TT
-CLASS="LITERAL"
->CYG_IO_GET_CONFIG_SERIAL_WRITE_BLOCKING</TT
-></DT
-><DD
-><P
-></P
-><DIV
-CLASS="VARIABLELIST"
-><DL
-><DT
->Buf type:</DT
-><DD
-><P
-> cyg_uint32 (values 0 or 1)</P
-></DD
-><DT
->Function:</DT
-><DD
-><P
->            This function will read back the blocking-mode
-            setting for write calls on this device. This call is only
-            available if the configuration option
-            <TT
-CLASS="LITERAL"
->CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING</TT
-> is enabled.</P
-></DD
-></DL
-></DIV
-></DD
-></DL
-></DIV
-></DIV
-><DIV
-CLASS="SECTION"
-><H3
-CLASS="SECTION"
-><A
-NAME="IO-SERIAL-CYG-SET-CONFIG">cyg_io_set_config</H3
-><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 update or change runtime configuration
-of a port. </P
-><P
-></P
-><DIV
-CLASS="VARIABLELIST"
-><DL
-><DT
-><TT
-CLASS="LITERAL"
->CYG_IO_SET_CONFIG_SERIAL_INFO</TT
-></DT
-><DD
-><P
-></P
-><DIV
-CLASS="VARIABLELIST"
-><DL
-><DT
->Buf type:</DT
-><DD
-><P
->cyg_serial_info_t</P
-></DD
-><DT
->Function:</DT
-><DD
-><P
->This function updates the information for the driver
-            and hardware.  The information contains fields for
-            hardware baud rate, number of stop bits, and parity
-            mode. It also includes a set of flags that control the
-            port, such as hardware flow control.
-            </P
-></DD
-></DL
-></DIV
-></DD
-><DT
-><TT
-CLASS="LITERAL"
->CYG_IO_SET_CONFIG_SERIAL_READ_BLOCKING</TT
-></DT
-><DD
-><P
-></P
-><DIV
-CLASS="VARIABLELIST"
-><DL
-><DT
->Buf type:</DT
-><DD
-><P
-> cyg_uint32 (values 0 or 1)</P
-></DD
-><DT
->Function:</DT
-><DD
-><P
->This function will set the blocking-mode for read
-            calls on this device. This call is only available if the
-            configuration option <TT
-CLASS="LITERAL"
->CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING</TT
->
-            is enabled.
-            </P
-></DD
-></DL
-></DIV
-></DD
-><DT
-><TT
-CLASS="LITERAL"
->CYG_IO_SET_CONFIG_SERIAL_WRITE_BLOCKING</TT
-></DT
-><DD
-><P
-></P
-><DIV
-CLASS="VARIABLELIST"
-><DL
-><DT
->Buf type:</DT
-><DD
-><P
->cyg_uint32 (values 0 or 1)</P
-></DD
-><DT
->Function:</DT
-><DD
-><P
->This function will set the blocking-mode for write
-            calls on this device. This call is only available if the
-            configuration option <TT
-CLASS="LITERAL"
->CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING</TT
->
-            is enabled.
-            </P
-></DD
-></DL
-></DIV
-></DD
-></DL
-></DIV
-></DIV
-></DIV
-></DIV
-></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="io-user-api.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="io-tty-driver.html"
-ACCESSKEY="N"
->Next</A
-></TD
-></TR
-><TR
-><TD
-WIDTH="33%"
-ALIGN="left"
-VALIGN="top"
->User API</TD
-><TD
-WIDTH="34%"
-ALIGN="center"
-VALIGN="top"
-><A
-HREF="io.html"
-ACCESSKEY="U"
->Up</A
-></TD
-><TD
-WIDTH="33%"
-ALIGN="right"
-VALIGN="top"
->TTY driver</TD
-></TR
-></TABLE
-></DIV
-></BODY
-></HTML
->
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