📄 hostc_events.htm
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<font color="#FFFFFF" size="5" face="Arial, Helvetica, sans-serif"><strong>Embedded SDIO Driver Kit Help </strong></font></td>
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<p class="BODYTEXT">Asynchronous events consist of request completion and slot
hardware events (insert/removal and pending slot IRQ) and are usually
indicated by interrupt processing
code in the HCD. HCDs can indicate asynchronous events to the SDIO
core using the <font face="Courier New, Courier, mono"><a href="HD_Reference.htm#FUNC_SDIO_HandleHcdEvent">SDIO_HandleHcdEvent()</a></font> API. HCDs
should only indicate SDIO events from deferred processing routines
and not from an interrupt handler that can operate
in a restricted context. </p>
<p class="BODYTEXT"><strong>Bus Request Completion:</strong></p>
<p class="BODYTEXT">The <font face="Courier New, Courier, mono">EVENT_HCD_TRANSFER_DONE</font> event
should be indicated when an SD request completes successfully or with
a failure status. The indication will start the next request (if any)
and process the request that was completed by the HCD. This function
may call the
HCD's <font face="Courier New, Courier, mono"><a href="HD_Reference.htm#FUNC_Request">pRequest</a></font> callback
to start the next request in the same calling context.</p>
<p class="BODYTEXT"><strong>Card Insertion/Removal:</strong></p>
<p class="BODYTEXT">HCDs that detect card insertion by a mechanical switch
can indicate the arrival (<font face="Courier New, Courier, mono">EVENT_HCD_ATTACH</font>)
and removal (<font face="Courier New, Courier, mono">EVENT_HCD_DETACH</font>)
of cards. The HCD is not required to power the slot until the SDIO
core issues a power configuration request with an initial slot voltage.
On card removal, the HCD should stop the current bus request (or let
it timeout) and report the event. The SDIO core is responsible for
notifying upper software layers of the removal. The HCD is responsible
for debouncing the slot and should only indicate this event once for
each occurance of insertion or removal.</p>
<p class="BODYTEXT"><strong>Card Interrupt Pending:</strong></p>
<p class="BODYTEXT">If the HCD supports SDIO cards, the slot's DAT1 pin is
an asynchronous (1-bit or SPI mode) or clock synchronous (4-bit
mode) level-sensitive interrupt source . The SDIO core issues a configuration
request to enable the slot interrupt detection logic when at least
one SDIO function requests
interrupt support. An HCD must only enable slot IRQ detection when
specifically requested by the SDIO core. When an SDIO slot interrupt
is detected, the HCD must mask
the interrupt source on its hardware controller and indicate
this event. This event cause the SDIO core
and peripheral drivers to process the interrupt using a series of SDIO
bus transactions. The HCD must wait until the <font face="Courier New, Courier, mono"><a href="hostc_configuration.htm">SDCONFIG_REARM_INT</a></font> command
is issued before unmasking the slot interrupt detection hardware. HCDs
should only indicate the <font face="Courier New, Courier, mono">EVENT_HCD_SDIO_IRQ_PENDING</font> event
only once for each slot interrupt.</p>
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