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>Chapter 33. Configuration</H1
><P
>The CAN subsystem has a number of configuration options.</P
><P
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><DIV
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><DL
><DT
><SPAN
CLASS="TYPE"
>cdl_interface CYGINT_IO_CAN_TIMESTAMP</SPAN
></DT
><DD
><P
>A hardware device driver that supports timestamps should implement this interface.
          </P
></DD
><DT
><SPAN
CLASS="TYPE"
>cdl_option CYGOPT_IO_CAN_SUPPORT_TIMESTAMP</SPAN
></DT
><DD
><P
>If the CAN hardware driver supports some kind of timestamps then this option enables 
propagation of timestamps to higher layers. This may add some extra code to hardware 
drivers.
          </P
></DD
><DT
><SPAN
CLASS="TYPE"
>cdl_option CYGOPT_IO_CAN_TX_EVENT_SUPPORT</SPAN
></DT
><DD
><P
> This option enables support for TX
events. If a CAN message is transmitted successfully a TX event will
be inserted into the receive event queue and propagated to higher
layers.  If this option is enabled the RX event queue will be filled
faster.</P
></DD
><DT
><SPAN
CLASS="TYPE"
>cdl_option CYGOPT_IO_CAN_SUPPORT_NONBLOCKING</SPAN
></DT
><DD
><P
>This option enables extra code in the generic CAN driver which allows
clients to switch read() and write() call semantics from blocking to
non-blocking.</P
></DD
><DT
><SPAN
CLASS="TYPE"
>cdl_option CYGOPT_IO_CAN_SUPPORT_CALLBACK</SPAN
></DT
><DD
><P
>This option enables extra code in the generic CAN driver which allows
an application to register a callback for events. The callback function
is called from DSR context so you should be careful to only call API
functions that are safe in DSR context.</P
></DD
><DT
><SPAN
CLASS="TYPE"
>cdl_option CYGNUM_IO_CAN_DEFAULT_TIMEOUT_READ</SPAN
></DT
><DD
><P
>The initial timeout value in clock ticks for <CODE
CLASS="FUNCTION"
>cyg_io_read()</CODE
> calls.
          </P
></DD
><DT
><SPAN
CLASS="TYPE"
>cdl_option CYGNUM_IO_CAN_DEFAULT_TIMEOUT_WRITE</SPAN
></DT
><DD
><P
> The initial timeout value in clock ticks
for <CODE
CLASS="FUNCTION"
>cyg_io_write()</CODE
> calls.
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