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>Chapter 18. Device Driver Interface to the Kernel</TD
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><HR
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><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"
><cyg/hal/drv_api.h></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
></DIV
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