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<div class="title">xQueueReceiveFromISR</div> </div>
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<p>queue. h </p><pre>
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BaseType_t xQueueReceiveFromISR(
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QueueHandle_t xQueue,
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void *pvBuffer,
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BaseType_t *pxTaskWoken
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);
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</pre><p>Receive an item from a queue. It is safe to use this function from within an interrupt service routine.</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">xQueue</td><td>The handle to the queue from which the item is to be received.</td></tr>
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<tr><td class="paramname">pvBuffer</td><td>Pointer to the buffer into which the received item will be copied.</td></tr>
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<tr><td class="paramname">pxTaskWoken</td><td>A task may be blocked waiting for space to become available on the queue. If xQueueReceiveFromISR causes such a task to unblock *pxTaskWoken will get set to pdTRUE, otherwise *pxTaskWoken will remain unchanged.</td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>pdTRUE if an item was successfully received from the queue, otherwise pdFALSE.</dd></dl>
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<p>Example usage: </p><pre></pre><pre>QueueHandle_t xQueue;</pre><pre>// Function to create a queue and post some values.
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void vAFunction( void *pvParameters )
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{
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char cValueToPost;
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const TickType_t xTicksToWait = ( TickType_t )0xff;</pre><pre> // Create a queue capable of containing 10 characters.
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xQueue = xQueueCreate( 10, sizeof( char ) );
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if( xQueue == 0 )
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{
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// Failed to create the queue.
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}</pre><pre> // ...</pre><pre> // Post some characters that will be used within an ISR. If the queue
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// is full then this task will block for xTicksToWait ticks.
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cValueToPost = 'a';
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<a class="el" href="queue_8h.html#af7eb49d3249351176992950d9185abe9">xQueueSend( xQueue, ( void * ) &cValueToPost, xTicksToWait )</a>;
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cValueToPost = 'b';
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<a class="el" href="queue_8h.html#af7eb49d3249351176992950d9185abe9">xQueueSend( xQueue, ( void * ) &cValueToPost, xTicksToWait )</a>;</pre><pre> // ... keep posting characters ... this task may block when the queue
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// becomes full.</pre><pre> cValueToPost = 'c';
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<a class="el" href="queue_8h.html#af7eb49d3249351176992950d9185abe9">xQueueSend( xQueue, ( void * ) &cValueToPost, xTicksToWait )</a>;
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}</pre><pre>// ISR that outputs all the characters received on the queue.
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void vISR_Routine( void )
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{
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BaseType_t xTaskWokenByReceive = pdFALSE;
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char cRxedChar;</pre><pre> while( xQueueReceiveFromISR( xQueue, ( void * ) &cRxedChar, &xTaskWokenByReceive) )
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{
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// A character was received. Output the character now.
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vOutputCharacter( cRxedChar );</pre><pre> // If removing the character from the queue woke the task that was
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// posting onto the queue cTaskWokenByReceive will have been set to
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// pdTRUE. No matter how many times this loop iterates only one
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// task will be woken.
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}</pre><pre> if( cTaskWokenByPost != ( char ) pdFALSE;
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{
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taskYIELD ();
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}
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}
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