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>Chapter 18. Device Driver Interface to the Kernel</TD
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><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><DIV
CLASS="SECTION"
><H1
CLASS="SECTION"
><A
NAME="DEVAPI-API">The API</H1
><P
>This section details the Driver Kernel
Interface. Note that most of these functions are identical to Kernel C
API calls, and will in most configurations be wrappers for them. In
non-kernel configurations they will be supported directly by the HAL,
or by code to emulate the required behavior.</P
><P
>This API is defined in the header file
<TT
CLASS="FILENAME"
>&lt;cyg/hal/drv_api.h&gt;</TT
>.</P
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN11310">cyg_drv_isr_lock</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_isr_lock()</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
>None</P
></DD
><DT
>Result:</DT
><DD
><P
>None </P
></DD
><DT
>Level:</DT
><DD
><P
>ISR</P
></DD
><DT
>Description:</DT
><DD
><P
>      Disables delivery of interrupts, preventing all ISRs running.  This
      function maintains a counter of the number of times it is
      called.
      </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN11333">cyg_drv_isr_unlock</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_isr_unlock()</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
>None</P
></DD
><DT
>Result:</DT
><DD
><P
>None </P
></DD
><DT
>Level:</DT
><DD
><P
>ISR</P
></DD
><DT
>Description:</DT
><DD
><P
>Re-enables delivery of interrupts, allowing ISRs to
      run. This function decrements the counter maintained by
      <TT
CLASS="FUNCTION"
>cyg_drv_isr_lock()</TT
>, and only re-allows
      interrupts when it goes to zero. </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN11357">cyg_drv_spinlock_init</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_spinlock_init(cyg_spinlock_t *lock, cyg_bool_t locked )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>lock</I
></TT
> - pointer to spinlock to initialize</P
><P
><TT
CLASS="PARAMETER"
><I
>locked</I
></TT
> - initial state of lock</P
></DD
><DT
>Result:</DT
><DD
><P
>None</P
></DD
><DT
>Level:</DT
><DD
><P
>Thread</P
></DD
><DT
>Description:</DT
><DD
><P
>      Initialize a spinlock. The <TT
CLASS="PARAMETER"
><I
>locked</I
></TT
>
      argument indicates how the spinlock should be initialized:
      <TT
CLASS="LITERAL"
>TRUE</TT
> for locked or <TT
CLASS="LITERAL"
>FALSE</TT
>
      for unlocked state.
      </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN11386">cyg_drv_spinlock_destroy</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_spinlock_destroy(cyg_spinlock_t *lock )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>lock</I
></TT
> - pointer to spinlock destroy</P
></DD
><DT
>Result:</DT
><DD
><P
>None</P
></DD
><DT
>Level:</DT
><DD
><P
>Thread</P
></DD
><DT
>Description:</DT
><DD
><P
>      Destroy a spinlock that is no longer of use. There should be no
      CPUs attempting to claim the lock at the time this function is
      called, otherwise the behavior is undefined.
      </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN11410">cyg_drv_spinlock_spin</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_spinlock_spin(cyg_spinlock_t *lock )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>lock</I
></TT
> - pointer to spinlock to claim</P
></DD
><DT
>Result:</DT
><DD
><P
>None</P
></DD
><DT
>Level:</DT
><DD
><P
>ISR</P
></DD
><DT
>Description:</DT
><DD
><P
>      Claim a spinlock, waiting in a busy loop until it is
      available. Wherever this is called from, this operation
      effectively pauses the CPU until it succeeds. This operations
      should therefore be used sparingly, and in situations where
      deadlocks/livelocks cannot occur. Also see
      <TT
CLASS="FUNCTION"
>cyg_drv_spinlock_spin_intsave()</TT
>.
      </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN11435">cyg_drv_spinlock_clear</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_spinlock_clear(cyg_spinlock_t *lock )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>lock</I
></TT
> - pointer to spinlock to clear </P
></DD
><DT
>Result:</DT
><DD
><P
>None</P
></DD
><DT
>Level:</DT
><DD
><P
>ISR</P
></DD
><DT
>Description:</DT
><DD
><P
>      Clear a spinlock. This clears the spinlock and allows another
      CPU to claim it. If there is more than one CPU waiting in
      <TT
CLASS="FUNCTION"
>cyg_drv_spinlock_spin()</TT
> then just one of
      them will be allowed to proceed.
      </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN11460">cyg_drv_spinlock_try</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>cyg_bool_t cyg_drv_spinlock_try(cyg_spinlock_t *lock )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>lock</I
></TT
> - pointer to spinlock to try</P
></DD
><DT
>Result:</DT
><DD
><P
><TT
CLASS="LITERAL"
>TRUE</TT
> if the spinlock was claimed,
      <TT
CLASS="LITERAL"
>FALSE</TT
> otherwise.</P
></DD
><DT
>Level:</DT
><DD
><P
>ISR</P
></DD
><DT
>Description:</DT
><DD
><P
>      Try to claim the spinlock without waiting. If the spinlock could
      be claimed immediately then <TT
CLASS="LITERAL"
>TRUE</TT
> is
      returned. If the spinlock is already claimed then the result is
      <TT
CLASS="LITERAL"
>FALSE</TT
>.
      </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN11488">cyg_drv_spinlock_test</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>cyg_bool_t cyg_drv_spinlock_test(cyg_spinlock_t *lock )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>lock</I
></TT
> - pointer to spinlock to test</P
></DD
><DT
>Result:</DT
><DD
><P
><TT
CLASS="LITERAL"
>TRUE</TT
> if the spinlock is available,
      <TT
CLASS="LITERAL"
>FALSE</TT
> otherwise.</P
></DD
><DT
>Level:</DT
><DD
><P
>ISR</P
></DD
><DT
>Description:</DT
><DD
><P
>      Inspect the state of the spinlock. If the spinlock is not locked
      then the result is <TT
CLASS="LITERAL"
>TRUE</TT
>. If it is locked then
      the result will be <TT
CLASS="LITERAL"
>FALSE</TT
>.
      </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN11516">cyg_drv_spinlock_spin_intsave</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_spinlock_spin_intsave(cyg_spinlock_t *lock,
                                   cyg_addrword_t *istate )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>lock</I
></TT
> - pointer to spinlock to claim</P
><P
><TT
CLASS="PARAMETER"
><I
>istate</I
></TT
> - pointer to interrupt state save location</P
></DD
><DT
>Result:</DT
><DD
><P
>None</P
></DD
><DT
>Level:</DT
><DD
><P
>ISR</P
></DD
><DT
>Description:</DT
><DD
><P
>      This function behaves exactly like
      <TT
CLASS="FUNCTION"
>cyg_drv_spinlock_spin()</TT
> except that it also
      disables interrupts before attempting to claim the lock. The
      current interrupt enable state is saved in
      <TT
CLASS="PARAMETER"
><I
>*istate</I
></TT
>. Interrupts remain disabled once
      the spinlock had been claimed and must be restored by calling
      <TT
CLASS="FUNCTION"
>cyg_drv_spinlock_clear_intsave()</TT
>.
      </P
><P
>      In general, device drivers should use this function to claim and
      release spinlocks rather than the
      non-<TT
CLASS="FUNCTION"
>_intsave()</TT
> variants, to ensure proper
      exclusion with code running on both other CPUs and this CPU.
      </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN11547">cyg_drv_spinlock_clear_intsave</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_spinlock_clear_intsave( cyg_spinlock_t *lock,
                                     cyg_addrword_t istate )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>lock</I
></TT
> - pointer to spinlock to clear </P
><P
><TT
CLASS="PARAMETER"
><I
>istate</I
></TT
> - interrupt state to restore </P
></DD
><DT
>Result:</DT
><DD
><P
>None</P
></DD
><DT
>Level:</DT
><DD
><P
>ISR</P
></DD
><DT
>Description:</DT
><DD
><P
>      This function behaves exactly like
      <TT
CLASS="FUNCTION"
>cyg_drv_spinlock_clear()</TT
> except that it
      also restores an interrupt state saved by
      <TT
CLASS="FUNCTION"
>cyg_drv_spinlock_spin_intsave()</TT
>. The
      <TT
CLASS="PARAMETER"
><I
>istate</I
></TT
> argument must have been
      initialized by a previous call to
      <TT
CLASS="FUNCTION"
>cyg_drv_spinlock_spin_intsave()</TT
>.
      </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN11577">cyg_drv_dsr_lock</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_dsr_lock()</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
>None</P
></DD
><DT
>Result:</DT
><DD
><P
>None </P
></DD
><DT
>Level:</DT
><DD
><P
>DSR</P
></DD
><DT
>Description:</DT
><DD
><P
>Disables scheduling of DSRs. This function maintains a
      counter of the number of times it has been called. </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN11600">cyg_drv_dsr_unlock</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_dsr_unlock()</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
>None</P
></DD
><DT
>Result:</DT
><DD
><P
>		</P
><P
>None </P
></DD
><DT
>Level:</DT
><DD
><P
>DSR</P
></DD
><DT
>Description:</DT
><DD
><P
>Re-enables scheduling of DSRs. This function decrements
      the counter incremented by
      <TT
CLASS="FUNCTION"
>cyg_drv_dsr_lock()</TT
>.  DSRs are only allowed
      to be delivered when the counter goes to zero. </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN11625">cyg_drv_mutex_init</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_mutex_init(cyg_drv_mutex *mutex)</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>mutex</I
></TT
> - pointer to mutex to initialize</P
></DD
><DT
>Result:</DT
><DD
><P
>None </P
></DD
><DT
>Level:</DT
><DD
><P
>Thread</P
></DD
><DT
>Description:</DT
><DD
><P
>Initialize the mutex pointed to by the
      <TT
CLASS="LITERAL"
>mutex</TT
> argument. </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN11650">cyg_drv_mutex_destroy</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_mutex_destroy( cyg_drv_mutex *mutex )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>mutex</I
></TT
> - pointer to mutex to destroy</P
></DD
><DT
>Result:</DT
><DD
><P
>None </P
></DD
><DT
>Level:</DT
><DD
><P
>Thread</P
></DD
><DT
>Description:</DT
><DD
><P
>Destroy the mutex pointed to by the
      <TT
CLASS="PARAMETER"
><I
>mutex</I
></TT
> argument. The mutex should be unlocked
      and there should be no threads waiting to lock it when this call
      in made.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN11675">cyg_drv_mutex_lock</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>cyg_bool cyg_drv_mutex_lock( cyg_drv_mutex *mutex )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>mutex</I
></TT
> - pointer to mutex to lock</P
></DD
><DT
>Result:</DT
><DD
><P
><TT
CLASS="LITERAL"
>TRUE</TT
> it the thread has claimed the
      lock, <TT
CLASS="LITERAL"
>FALSE</TT
> otherwise.</P
></DD
><DT
>Level:</DT
><DD
><P
>Thread</P
></DD
><DT
>Description:</DT
><DD
><P
>Attempt to lock the mutex pointed to by the
      <TT
CLASS="PARAMETER"
><I
>mutex</I
></TT
> argument.  If the mutex is already
      locked by another thread then this thread will wait until that
      thread is finished. If the result from this function is
      <TT
CLASS="LITERAL"
>FALSE</TT
> then the thread was broken out of its
      wait by some other thread. In this case the mutex will not have
      been locked. </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN11703">cyg_drv_mutex_trylock</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>cyg_bool cyg_drv_mutex_trylock( cyg_drv_mutex *mutex )</PRE
></TD
></TR
></TABLE
></P
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>mutex</I
></TT
> - pointer to mutex to lock</P
></DD
><DT
>Result:</DT
><DD
><P
><TT
CLASS="LITERAL"
>TRUE</TT
> if the mutex has been locked,
      <TT
CLASS="LITERAL"
>FALSE</TT
> otherwise. </P
></DD
><DT
>Level:</DT
><DD
><P
>Thread</P
></DD
><DT
>Description:</DT
><DD
><P
>Attempt to lock the mutex pointed to by the
      <TT
CLASS="PARAMETER"
><I
>mutex</I
></TT
> argument without waiting. If the
      mutex is already locked by some other thread then this function
      returns <TT
CLASS="LITERAL"
>FALSE</TT
>. If the function can lock the
      mutex without waiting, then <TT
CLASS="LITERAL"
>TRUE</TT
> is
      returned. </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN11733">cyg_drv_mutex_unlock</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_mutex_unlock( cyg_drv_mutex *mutex )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>mutex</I
></TT
> - pointer to mutex to unlock</P
></DD
><DT
>Result:</DT
><DD
><P
>None </P
></DD
><DT
>Level:</DT
><DD
><P
>Thread</P
></DD
><DT
>Description:</DT
><DD
><P
>Unlock the mutex pointed to by the
      <TT
CLASS="PARAMETER"
><I
>mutex</I
></TT
> argument. If there are any threads
      waiting to claim the lock, one of them is woken up to try and
      claim it. </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN11758">cyg_drv_mutex_release</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_mutex_release( cyg_drv_mutex *mutex )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="LITERAL"
>mutex</TT
> - pointer to mutex to release</P
></DD
><DT
>Result:</DT
><DD
><P
>None </P
></DD
><DT
>Level:</DT
><DD
><P
>Thread</P
></DD
><DT
>Description:</DT
><DD
><P
>Release all threads waiting on the mutex pointed to by the
      <TT
CLASS="PARAMETER"
><I
>mutex</I
></TT
> argument. These threads will return
      from <TT
CLASS="FUNCTION"
>cyg_drv_mutex_lock()</TT
> with a
      <TT
CLASS="LITERAL"
>FALSE</TT
> result and will not have claimed the
      mutex. This function has no effect on any thread that may have
      the mutex claimed. </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN11785">cyg_drv_cond_init</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
> void cyg_drv_cond_init( cyg_drv_cond *cond, cyg_drv_mutex *mutex )
	      </PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>cond</I
></TT
> - condition variable to initialize</P
><P
><TT
CLASS="PARAMETER"
><I
>mutex</I
></TT
> - mutex to associate with this condition variable</P
></DD
><DT
>Result:</DT
><DD
><P
>None</P
></DD
><DT
>Level:</DT
><DD
><P
>Thread </P
></DD
><DT
>Description:</DT
><DD
><P
>Initialize the condition variable pointed to by the
      <TT
CLASS="PARAMETER"
><I
>cond</I
></TT
> argument.  The
      <TT
CLASS="PARAMETER"
><I
>mutex</I
></TT
> argument must point to a mutex with
      which this condition variable is associated. A thread may only
      wait on this condition variable when it has already locked the
      associated mutex. Waiting will cause the mutex to be unlocked,
      and when the thread is reawakened, it will automatically claim
      the mutex before continuing. </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN11813">cyg_drv_cond_destroy</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
> void cyg_drv_cond_destroy( cyg_drv_cond *cond )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>cond</I
></TT
> - condition variable to destroy</P
></DD
><DT
>Result:</DT
><DD
><P
>None </P
></DD
><DT
>Level:</DT
><DD
><P
>Thread</P
></DD
><DT
>Description:</DT
><DD
><P
>Destroy the condition variable pointed to by the
      <TT
CLASS="PARAMETER"
><I
>cond</I
></TT
> argument. </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN11838">cyg_drv_cond_wait</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_cond_wait( cyg_drv_cond *cond )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>cond</I
></TT
> - condition variable to wait on</P
></DD
><DT
>Result:</DT
><DD
><P
>None </P
></DD
><DT
>Level:</DT
><DD
><P
>Thread</P
></DD
><DT
>Description:</DT
><DD
><P
>Wait for a signal on the condition variable pointed to by
      the <TT
CLASS="PARAMETER"
><I
>cond</I
></TT
> argument. The thread must have
      locked the associated mutex, supplied in
      <TT
CLASS="FUNCTION"
>cyg_drv_cond_init()</TT
>, before waiting on this
      condition variable. While the thread waits, the mutex will be
      unlocked, and will be re-locked before this function returns. It
      is possible for threads waiting on a condition variable to
      occasionally wake up spuriously. For this reason it is necessary
      to use this function in a loop that re-tests the condition each
      time it returns. Note that this function performs an implicit
      scheduler unlock/relock sequence, so that it may be used within
      an explicit
      <TT
CLASS="LITERAL"
>cyg_drv_dsr_lock()...cyg_drv_dsr_unlock()</TT
>
      structure.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN11865">cyg_drv_cond_signal</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_cond_signal( cyg_drv_cond *cond )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>cond</I
></TT
> - condition variable to signal</P
></DD
><DT
>Result:</DT
><DD
><P
>None </P
></DD
><DT
>Level:</DT
><DD
><P
>DSR</P
></DD
><DT
>Description:</DT
><DD
><P
>Signal the condition variable pointed to by the <TT
CLASS="PARAMETER"
><I
>cond</I
></TT
>
      argument.  If there are any threads waiting on this variable at
      least one of them will be awakened. Note that in some
      configurations there may not be any difference between this
      function and <TT
CLASS="FUNCTION"
>cyg_drv_cond_broadcast()</TT
>.
      </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN11891">cyg_drv_cond_broadcast</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_cond_broadcast( cyg_drv_cond *cond )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>cond</I
></TT
> - condition variable to broadcast to</P
></DD
><DT
>Result:</DT
><DD
><P
>None </P
></DD
><DT
>Level:</DT
><DD
><P
>DSR</P
></DD
><DT
>Description:</DT
><DD
><P
>Signal the condition variable pointed to by the
      <TT
CLASS="PARAMETER"
><I
>cond</I
></TT
> argument.  If there are any threads
      waiting on this variable they will all be awakened. </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN11916">cyg_drv_interrupt_create</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_interrupt_create( cyg_vector_t vector,
                               cyg_priority_t priority,
                               cyg_addrword_t data,
                               cyg_ISR_t *isr,
                               cyg_DSR_t *dsr,
                               cyg_handle_t *handle,
                               cyg_interrupt *intr
                             )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>vector</I
></TT
> - vector to attach to</P
><P
><TT
CLASS="PARAMETER"
><I
>priority</I
></TT
> - queuing priority</P
><P
><TT
CLASS="PARAMETER"
><I
>data</I
></TT
> - data pointer</P
><P
><TT
CLASS="PARAMETER"
><I
>isr</I
></TT
> - interrupt service routine</P
><P
><TT
CLASS="PARAMETER"
><I
>dsr</I
></TT
> - deferred service routine</P
><P
><TT
CLASS="PARAMETER"
><I
>handle</I
></TT
> - returned handle</P
><P
><TT
CLASS="PARAMETER"
><I
>intr</I
></TT
> - put interrupt object here</P
></DD
><DT
>Result:</DT
><DD
><P
>None</P
></DD
><DT
>Level:</DT
><DD
><P
>Thread</P
></DD
><DT
>Description:</DT
><DD
><P
>Create an interrupt object and returns a handle to it. The
      object contains information about which interrupt vector to use
      and the ISR and DSR that will be called after the interrupt
      object is attached to the vector. The interrupt object will be
      allocated in the memory passed in the
      <TT
CLASS="PARAMETER"
><I
>intr</I
></TT
> parameter. The interrupt object is
      not immediately attached; it must be attached with the
      <TT
CLASS="FUNCTION"
>cyg_interrupt_attach()</TT
> call. </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN11954">cyg_drv_interrupt_delete</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
> void cyg_drv_interrupt_delete( cyg_handle_t interrupt )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>interrupt</I
></TT
> - interrupt to delete</P
></DD
><DT
>Result:</DT
><DD
><P
>None </P
></DD
><DT
>Level:</DT
><DD
><P
>Thread</P
></DD
><DT
>Description:</DT
><DD
><P
>Detach the interrupt from the vector and free the memory
      passed in the <TT
CLASS="PARAMETER"
><I
>intr</I
></TT
> argument to
      <TT
CLASS="FUNCTION"
>cyg_drv_interrupt_create()</TT
> for
      reuse. </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN11980">cyg_drv_interrupt_attach</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_interrupt_attach( cyg_handle_t interrupt )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>interrupt</I
></TT
> - interrupt to attach</P
></DD
><DT
>Result:</DT
><DD
><P
>None </P
></DD
><DT
>Level:</DT
><DD
><P
>ISR</P
></DD
><DT
>Description:</DT
><DD
><P
>Attach the interrupt to the vector so that interrupts will
      be delivered to the ISR when the interrupt occurs. </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN12004">cyg_drv_interrupt_detach</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_interrupt_detach( cyg_handle_t interrupt )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>interrupt</I
></TT
> - interrupt to detach</P
></DD
><DT
>Result:</DT
><DD
><P
>None </P
></DD
><DT
>Level:</DT
><DD
><P
>ISR</P
></DD
><DT
>Description:</DT
><DD
><P
>Detach the interrupt from the vector so that interrupts
      will no longer be delivered to the ISR. </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN12028">cyg_drv_interrupt_mask</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_interrupt_mask(cyg_vector_t vector )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>vector</I
></TT
> - vector to mask</P
></DD
><DT
>Result:</DT
><DD
><P
>None </P
></DD
><DT
>Level:</DT
><DD
><P
>ISR</P
></DD
><DT
>Description:</DT
><DD
><P
>Program the interrupt controller to stop delivery of
      interrupts on the given vector. On architectures which implement
      interrupt priority levels this may also disable all lower
      priority interrupts. </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN12052">cyg_drv_interrupt_mask_intunsafe</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_interrupt_mask_intunsafe(cyg_vector_t vector )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>vector</I
></TT
> - vector to mask</P
></DD
><DT
>Result:</DT
><DD
><P
>None </P
></DD
><DT
>Level:</DT
><DD
><P
>ISR</P
></DD
><DT
>Description:</DT
><DD
><P
>Program the interrupt controller to stop delivery of
      interrupts on the given vector. On architectures which implement
      interrupt priority levels this may also disable all lower
      priority interrupts. This version differs from
      <TT
CLASS="FUNCTION"
>cyg_drv_interrupt_mask()</TT
> in not being
      interrupt safe. So in situations where, for example, interrupts
      are already known to be disabled, this may be called to avoid
      the extra overhead.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN12077">cyg_drv_interrupt_unmask</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_interrupt_unmask(cyg_vector_t vector )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>vector</I
></TT
> - vector to unmask</P
></DD
><DT
>Result:</DT
><DD
><P
>None </P
></DD
><DT
>Level:</DT
><DD
><P
>ISR</P
></DD
><DT
>Description:</DT
><DD
><P
>Program the interrupt controller to re-allow delivery of
      interrupts on the given <TT
CLASS="PARAMETER"
><I
>vector</I
></TT
>. </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN12102">cyg_drv_interrupt_unmask_intunsafe</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_interrupt_unmask_intunsafe(cyg_vector_t vector )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>vector</I
></TT
> - vector to unmask</P
></DD
><DT
>Result:</DT
><DD
><P
>None </P
></DD
><DT
>Level:</DT
><DD
><P
>ISR</P
></DD
><DT
>Description:</DT
><DD
><P
>Program the interrupt controller to re-allow delivery of
      interrupts on the given <TT
CLASS="PARAMETER"
><I
>vector</I
></TT
>. This
      version differs from
      <TT
CLASS="FUNCTION"
>cyg_drv_interrupt_unmask()</TT
> in not being
      interrupt safe.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN12128">cyg_drv_interrupt_acknowledge</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_interrupt_acknowledge( cyg_vector_t vector )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>vector</I
></TT
> - vector to acknowledge</P
></DD
><DT
>Result:</DT
><DD
><P
>None </P
></DD
><DT
>Level:</DT
><DD
><P
>ISR</P
></DD
><DT
>Description:</DT
><DD
><P
>Perform any processing required at the interrupt
      controller and in the CPU to cancel the current interrupt
      request on the <TT
CLASS="PARAMETER"
><I
>vector</I
></TT
>. An ISR may also
      need to program the hardware of the device to prevent an
      immediate re-triggering of the interrupt. </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN12153">cyg_drv_interrupt_configure</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_interrupt_configure( cyg_vector_t vector,
                                  cyg_bool_t level, 
                                  cyg_bool_t up
                                )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>vector</I
></TT
> - vector to configure</P
><P
><TT
CLASS="PARAMETER"
><I
>level</I
></TT
> - level or edge triggered</P
><P
><TT
CLASS="PARAMETER"
><I
>up</I
></TT
> - rising/falling edge, high/low level</P
></DD
><DT
>Result:</DT
><DD
><P
>None</P
></DD
><DT
>Level:</DT
><DD
><P
>ISR</P
></DD
><DT
>Description:</DT
><DD
><P
>Program the interrupt controller with the characteristics
      of the interrupt source. The <TT
CLASS="PARAMETER"
><I
>level</I
></TT
>
      argument chooses between level- or edge-triggered
      interrupts. The <TT
CLASS="PARAMETER"
><I
>up</I
></TT
> argument chooses
      between high and low level for level triggered interrupts or
      rising and falling edges for edge triggered interrupts. This
      function only works with interrupt controllers that can control
      these parameters. </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN12183">cyg_drv_interrupt_level</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_interrupt_level( cyg_vector_t vector,
                              cyg_priority_t level
                            )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>vector</I
></TT
> - vector to configure</P
><P
><TT
CLASS="PARAMETER"
><I
>level</I
></TT
> - level to set</P
></DD
><DT
>Result:</DT
><DD
><P
>None </P
></DD
><DT
>Level:</DT
><DD
><P
>ISR</P
></DD
><DT
>Description:</DT
><DD
><P
>Program the interrupt controller to deliver the given
       interrupt at the supplied priority level. This function only
       works with interrupt controllers that can control this
       parameter.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN12209">cyg_drv_interrupt_set_cpu</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void cyg_drv_interrupt_set_cpu( cyg_vector_t vector,
                                cyg_cpu_t cpu
                              )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>vector</I
></TT
> - interrupt vector to route</P
><P
><TT
CLASS="PARAMETER"
><I
>cpu</I
></TT
> - destination CPU</P
></DD
><DT
>Result:</DT
><DD
><P
>None</P
></DD
><DT
>Level:</DT
><DD
><P
>ISR</P
></DD
><DT
>Description:</DT
><DD
><P
>      This function causes all interrupts on the given vector to be
      routed to the specified CPU. Subsequently, all such interrupts
      will be handled by that CPU. This only works if the underlying
      hardware is capable of performing this kind of routing. This
      function does nothing on a single CPU system.
      </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN12235">cyg_drv_interrupt_get_cpu</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Function:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>cyg_cpu_t cyg_drv_interrupt_set_cpu( cyg_vector_t vector )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Arguments:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>vector</I
></TT
> - interrupt vector to query</P
></DD
><DT
>Result:</DT
><DD
><P
>The CPU to which this vector is routed</P
></DD
><DT
>Level:</DT
><DD
><P
>ISR</P
></DD
><DT
>Description:</DT
><DD
><P
>      In multi-processor systems this function returns the id of the
      CPU to which interrupts on the given vector are current being
      delivered. In single CPU systems this function returns zero.
      </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN12259">cyg_ISR_t</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Type:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>typedef cyg_uint32 cyg_ISR_t( cyg_vector_t vector,
                              cyg_addrword_t data
                            )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Fields:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>vector</I
></TT
> - vector being delivered</P
><P
><TT
CLASS="PARAMETER"
><I
>data</I
></TT
> - data value supplied by client</P
></DD
><DT
>Result:</DT
><DD
><P
>Bit mask indicating whether interrupt was handled and
      whether the DSR should be called. </P
></DD
><DT
>Description:</DT
><DD
><P
>Interrupt Service Routine definition. A pointer to a
      function with this prototype is passed to
      <TT
CLASS="FUNCTION"
>cyg_interrupt_create()</TT
> when an interrupt
      object is created. When an interrupt is delivered the function
      will be called with the vector number and the data value that
      was passed to <TT
CLASS="FUNCTION"
>cyg_interrupt_create()</TT
>.
      </P
><P
>The return value is a bit mask containing one or both of the
      following bits: </P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>CYG_ISR_HANDLED</DT
><DD
><P
>indicates that the interrupt was handled by this
	    ISR. It is a configuration option whether this will
	    prevent further ISR being run. </P
></DD
><DT
>CYG_ISR_CALL_DSR</DT
><DD
><P
>causes the DSR that was passed to
	    <TT
CLASS="FUNCTION"
>cyg_interrupt_create()</TT
> to be
	    scheduled to be called.</P
></DD
></DL
></DIV
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN12294">cyg_DSR_t</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Type:</DT
><DD
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>typedef void cyg_DSR_t( cyg_vector_t vector,
                        cyg_ucount32 count,
                        cyg_addrword_t data
                      )</PRE
></TD
></TR
></TABLE
></DD
><DT
>Fields:</DT
><DD
><P
><TT
CLASS="PARAMETER"
><I
>vector</I
></TT
> - vector being delivered</P
><P
><TT
CLASS="PARAMETER"
><I
>count</I
></TT
> - number of times DSR has been scheduled</P
><P
><TT
CLASS="PARAMETER"
><I
>data</I
></TT
> - data value supplied by client</P
></DD
><DT
>Result:</DT
><DD
><P
>None</P
></DD
><DT
>Description:</DT
><DD
><P
>Deferred Service Routine prototype. A pointer to a
      function with this prototype is passed to
      <TT
CLASS="FUNCTION"
>cyg_interrupt_create()</TT
> when an interrupt
      object is created. When the ISR requests the scheduling of its
      DSR, this function will be called at some later point. In
      addition to the <TT
CLASS="PARAMETER"
><I
>vector</I
></TT
> and
      <TT
CLASS="PARAMETER"
><I
>data</I
></TT
> arguments, which will be the same as
      those passed to the ISR, this routine is also passed a
      <TT
CLASS="PARAMETER"
><I
>count</I
></TT
> of the number of times the ISR has
      requested that this DSR be scheduled.  This counter is zeroed
      each time the DSR actually runs, so it indicates how many
      interrupts have occurred since it last ran.</P
></DD
></DL
></DIV
></DIV
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