/*
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/*
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FreeRTOS.org V4.2.0 - Copyright (C) 2003-2007 Richard Barry.
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FreeRTOS.org V4.2.0 - Copyright (C) 2003-2007 Richard Barry.
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|
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This file is part of the FreeRTOS.org distribution.
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This file is part of the FreeRTOS.org distribution.
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|
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FreeRTOS.org is free software; you can redistribute it and/or modify
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FreeRTOS.org is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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(at your option) any later version.
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|
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FreeRTOS.org is distributed in the hope that it will be useful,
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FreeRTOS.org is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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GNU General Public License for more details.
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|
You should have received a copy of the GNU General Public License
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You should have received a copy of the GNU General Public License
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along with FreeRTOS.org; if not, write to the Free Software
|
along with FreeRTOS.org; if not, write to the Free Software
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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|
|
A special exception to the GPL can be applied should you wish to distribute
|
A special exception to the GPL can be applied should you wish to distribute
|
a combined work that includes FreeRTOS.org, without being obliged to provide
|
a combined work that includes FreeRTOS.org, without being obliged to provide
|
the source code for any proprietary components. See the licensing section
|
the source code for any proprietary components. See the licensing section
|
of http://www.FreeRTOS.org for full details of how and when the exception
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of http://www.FreeRTOS.org for full details of how and when the exception
|
can be applied.
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can be applied.
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|
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***************************************************************************
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***************************************************************************
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See http://www.FreeRTOS.org for documentation, latest information, license
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See http://www.FreeRTOS.org for documentation, latest information, license
|
and contact details. Please ensure to read the configuration and relevant
|
and contact details. Please ensure to read the configuration and relevant
|
port sections of the online documentation.
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port sections of the online documentation.
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***************************************************************************
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***************************************************************************
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*/
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*/
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#ifndef QUEUE_H
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#ifndef QUEUE_H
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#define QUEUE_H
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#define QUEUE_H
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|
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typedef void * xQueueHandle;
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typedef void * xQueueHandle;
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|
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/**
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/**
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* queue. h
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* queue. h
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* <pre>
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* <pre>
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xQueueHandle xQueueCreate(
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xQueueHandle xQueueCreate(
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unsigned portBASE_TYPE uxQueueLength,
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unsigned portBASE_TYPE uxQueueLength,
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unsigned portBASE_TYPE uxItemSize
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unsigned portBASE_TYPE uxItemSize
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);
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);
|
* </pre>
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* </pre>
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*
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*
|
* Creates a new queue instance. This allocates the storage required by the
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* Creates a new queue instance. This allocates the storage required by the
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* new queue and returns a handle for the queue.
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* new queue and returns a handle for the queue.
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*
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*
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* @param uxQueueLength The maximum number of items that the queue can contain.
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* @param uxQueueLength The maximum number of items that the queue can contain.
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*
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*
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* @param uxItemSize The number of bytes each item in the queue will require.
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* @param uxItemSize The number of bytes each item in the queue will require.
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* Items are queued by copy, not by reference, so this is the number of bytes
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* Items are queued by copy, not by reference, so this is the number of bytes
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* that will be copied for each posted item. Each item on the queue must be
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* that will be copied for each posted item. Each item on the queue must be
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* the same size.
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* the same size.
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*
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*
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* @return If the queue is successfully create then a handle to the newly
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* @return If the queue is successfully create then a handle to the newly
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* created queue is returned. If the queue cannot be created then 0 is
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* created queue is returned. If the queue cannot be created then 0 is
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* returned.
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* returned.
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*
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*
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* Example usage:
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* Example usage:
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<pre>
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<pre>
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struct AMessage
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struct AMessage
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{
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{
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portCHAR ucMessageID;
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portCHAR ucMessageID;
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portCHAR ucData[ 20 ];
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portCHAR ucData[ 20 ];
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};
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};
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|
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void vATask( void *pvParameters )
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void vATask( void *pvParameters )
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{
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{
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xQueueHandle xQueue1, xQueue2;
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xQueueHandle xQueue1, xQueue2;
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|
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// Create a queue capable of containing 10 unsigned long values.
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// Create a queue capable of containing 10 unsigned long values.
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xQueue1 = xQueueCreate( 10, sizeof( unsigned portLONG ) );
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xQueue1 = xQueueCreate( 10, sizeof( unsigned portLONG ) );
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if( xQueue1 == 0 )
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if( xQueue1 == 0 )
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{
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{
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// Queue was not created and must not be used.
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// Queue was not created and must not be used.
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}
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}
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|
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// Create a queue capable of containing 10 pointers to AMessage structures.
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// Create a queue capable of containing 10 pointers to AMessage structures.
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// These should be passed by pointer as they contain a lot of data.
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// These should be passed by pointer as they contain a lot of data.
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xQueue2 = xQueueCreate( 10, sizeof( struct AMessage * ) );
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xQueue2 = xQueueCreate( 10, sizeof( struct AMessage * ) );
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if( xQueue2 == 0 )
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if( xQueue2 == 0 )
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{
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{
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// Queue was not created and must not be used.
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// Queue was not created and must not be used.
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}
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}
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|
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// ... Rest of task code.
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// ... Rest of task code.
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}
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}
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</pre>
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</pre>
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* \defgroup xQueueCreate xQueueCreate
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* \defgroup xQueueCreate xQueueCreate
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* \ingroup QueueManagement
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* \ingroup QueueManagement
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*/
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*/
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xQueueHandle xQueueCreate( unsigned portBASE_TYPE uxQueueLength, unsigned portBASE_TYPE uxItemSize );
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xQueueHandle xQueueCreate( unsigned portBASE_TYPE uxQueueLength, unsigned portBASE_TYPE uxItemSize );
|
|
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/**
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/**
|
* queue. h
|
* queue. h
|
* <pre>
|
* <pre>
|
portBASE_TYPE xQueueSend(
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portBASE_TYPE xQueueSend(
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xQueueHandle xQueue,
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xQueueHandle xQueue,
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const void * pvItemToQueue,
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const void * pvItemToQueue,
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portTickType xTicksToWait
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portTickType xTicksToWait
|
);
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);
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* </pre>
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* </pre>
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*
|
*
|
* Post an item on a queue. The item is queued by copy, not by reference.
|
* Post an item on a queue. The item is queued by copy, not by reference.
|
* This function must not be called from an interrupt service routine.
|
* This function must not be called from an interrupt service routine.
|
* See xQueueSendFromISR () for an alternative which may be used in an ISR.
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* See xQueueSendFromISR () for an alternative which may be used in an ISR.
|
*
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*
|
* @param xQueue The handle to the queue on which the item is to be posted.
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* @param xQueue The handle to the queue on which the item is to be posted.
|
*
|
*
|
* @param pvItemToQueue A pointer to the item that is to be placed on the
|
* @param pvItemToQueue A pointer to the item that is to be placed on the
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* queue. The size of the items the queue will hold was defined when the
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* queue. The size of the items the queue will hold was defined when the
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* queue was created, so this many bytes will be copied from pvItemToQueue
|
* queue was created, so this many bytes will be copied from pvItemToQueue
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* into the queue storage area.
|
* into the queue storage area.
|
*
|
*
|
* @param xTicksToWait The maximum amount of time the task should block
|
* @param xTicksToWait The maximum amount of time the task should block
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* waiting for space to become available on the queue, should it already
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* waiting for space to become available on the queue, should it already
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* be full. The call will return immediately if this is set to 0. The
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* be full. The call will return immediately if this is set to 0. The
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* time is defined in tick periods so the constant portTICK_RATE_MS
|
* time is defined in tick periods so the constant portTICK_RATE_MS
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* should be used to convert to real time if this is required.
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* should be used to convert to real time if this is required.
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*
|
*
|
* @return pdTRUE if the item was successfully posted, otherwise errQUEUE_FULL.
|
* @return pdTRUE if the item was successfully posted, otherwise errQUEUE_FULL.
|
*
|
*
|
* Example usage:
|
* Example usage:
|
<pre>
|
<pre>
|
struct AMessage
|
struct AMessage
|
{
|
{
|
portCHAR ucMessageID;
|
portCHAR ucMessageID;
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portCHAR ucData[ 20 ];
|
portCHAR ucData[ 20 ];
|
} xMessage;
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} xMessage;
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|
|
unsigned portLONG ulVar = 10UL;
|
unsigned portLONG ulVar = 10UL;
|
|
|
void vATask( void *pvParameters )
|
void vATask( void *pvParameters )
|
{
|
{
|
xQueueHandle xQueue1, xQueue2;
|
xQueueHandle xQueue1, xQueue2;
|
struct AMessage *pxMessage;
|
struct AMessage *pxMessage;
|
|
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// Create a queue capable of containing 10 unsigned long values.
|
// Create a queue capable of containing 10 unsigned long values.
|
xQueue1 = xQueueCreate( 10, sizeof( unsigned portLONG ) );
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xQueue1 = xQueueCreate( 10, sizeof( unsigned portLONG ) );
|
|
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// Create a queue capable of containing 10 pointers to AMessage structures.
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// Create a queue capable of containing 10 pointers to AMessage structures.
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// These should be passed by pointer as they contain a lot of data.
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// These should be passed by pointer as they contain a lot of data.
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xQueue2 = xQueueCreate( 10, sizeof( struct AMessage * ) );
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xQueue2 = xQueueCreate( 10, sizeof( struct AMessage * ) );
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|
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// ...
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// ...
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|
|
if( xQueue1 != 0 )
|
if( xQueue1 != 0 )
|
{
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{
|
// Send an unsigned long. Wait for 10 ticks for space to become
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// Send an unsigned long. Wait for 10 ticks for space to become
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// available if necessary.
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// available if necessary.
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if( xQueueSend( xQueue1, ( void * ) &ulVar, ( portTickType ) 10 ) != pdPASS )
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if( xQueueSend( xQueue1, ( void * ) &ulVar, ( portTickType ) 10 ) != pdPASS )
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{
|
{
|
// Failed to post the message, even after 10 ticks.
|
// Failed to post the message, even after 10 ticks.
|
}
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}
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}
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}
|
|
|
if( xQueue2 != 0 )
|
if( xQueue2 != 0 )
|
{
|
{
|
// Send a pointer to a struct AMessage object. Don't block if the
|
// Send a pointer to a struct AMessage object. Don't block if the
|
// queue is already full.
|
// queue is already full.
|
pxMessage = & xMessage;
|
pxMessage = & xMessage;
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xQueueSend( xQueue2, ( void * ) &pxMessage, ( portTickType ) 0 );
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xQueueSend( xQueue2, ( void * ) &pxMessage, ( portTickType ) 0 );
|
}
|
}
|
|
|
// ... Rest of task code.
|
// ... Rest of task code.
|
}
|
}
|
</pre>
|
</pre>
|
* \defgroup xQueueSend xQueueSend
|
* \defgroup xQueueSend xQueueSend
|
* \ingroup QueueManagement
|
* \ingroup QueueManagement
|
*/
|
*/
|
signed portBASE_TYPE xQueueSend( xQueueHandle xQueue, const void * pvItemToQueue, portTickType xTicksToWait );
|
signed portBASE_TYPE xQueueSend( xQueueHandle xQueue, const void * pvItemToQueue, portTickType xTicksToWait );
|
|
|
/**
|
/**
|
* queue. h
|
* queue. h
|
* <pre>
|
* <pre>
|
portBASE_TYPE xQueueReceive(
|
portBASE_TYPE xQueueReceive(
|
xQueueHandle xQueue,
|
xQueueHandle xQueue,
|
void *pvBuffer,
|
void *pvBuffer,
|
portTickType xTicksToWait
|
portTickType xTicksToWait
|
);</pre>
|
);</pre>
|
*
|
*
|
* Receive an item from a queue. The item is received by copy so a buffer of
|
* Receive an item from a queue. The item is received by copy so a buffer of
|
* adequate size must be provided. The number of bytes copied into the buffer
|
* adequate size must be provided. The number of bytes copied into the buffer
|
* was defined when the queue was created.
|
* was defined when the queue was created.
|
*
|
*
|
* This function must not be used in an interrupt service routine. See
|
* This function must not be used in an interrupt service routine. See
|
* xQueueReceiveFromISR for an alternative that can.
|
* xQueueReceiveFromISR for an alternative that can.
|
*
|
*
|
* @param pxQueue The handle to the queue from which the item is to be
|
* @param pxQueue The handle to the queue from which the item is to be
|
* received.
|
* received.
|
*
|
*
|
* @param pvBuffer Pointer to the buffer into which the received item will
|
* @param pvBuffer Pointer to the buffer into which the received item will
|
* be copied.
|
* be copied.
|
*
|
*
|
* @param xTicksToWait The maximum amount of time the task should block
|
* @param xTicksToWait The maximum amount of time the task should block
|
* waiting for an item to receive should the queue be empty at the time
|
* waiting for an item to receive should the queue be empty at the time
|
* of the call. The time is defined in tick periods so the constant
|
* of the call. The time is defined in tick periods so the constant
|
* portTICK_RATE_MS should be used to convert to real time if this is required.
|
* portTICK_RATE_MS should be used to convert to real time if this is required.
|
*
|
*
|
* @return pdTRUE if an item was successfully received from the queue,
|
* @return pdTRUE if an item was successfully received from the queue,
|
* otherwise pdFALSE.
|
* otherwise pdFALSE.
|
*
|
*
|
* Example usage:
|
* Example usage:
|
<pre>
|
<pre>
|
struct AMessage
|
struct AMessage
|
{
|
{
|
portCHAR ucMessageID;
|
portCHAR ucMessageID;
|
portCHAR ucData[ 20 ];
|
portCHAR ucData[ 20 ];
|
} xMessage;
|
} xMessage;
|
|
|
xQueueHandle xQueue;
|
xQueueHandle xQueue;
|
|
|
// Task to create a queue and post a value.
|
// Task to create a queue and post a value.
|
void vATask( void *pvParameters )
|
void vATask( void *pvParameters )
|
{
|
{
|
struct AMessage *pxMessage;
|
struct AMessage *pxMessage;
|
|
|
// Create a queue capable of containing 10 pointers to AMessage structures.
|
// Create a queue capable of containing 10 pointers to AMessage structures.
|
// These should be passed by pointer as they contain a lot of data.
|
// These should be passed by pointer as they contain a lot of data.
|
xQueue = xQueueCreate( 10, sizeof( struct AMessage * ) );
|
xQueue = xQueueCreate( 10, sizeof( struct AMessage * ) );
|
if( xQueue == 0 )
|
if( xQueue == 0 )
|
{
|
{
|
// Failed to create the queue.
|
// Failed to create the queue.
|
}
|
}
|
|
|
// ...
|
// ...
|
|
|
// Send a pointer to a struct AMessage object. Don't block if the
|
// Send a pointer to a struct AMessage object. Don't block if the
|
// queue is already full.
|
// queue is already full.
|
pxMessage = & xMessage;
|
pxMessage = & xMessage;
|
xQueueSend( xQueue, ( void * ) &pxMessage, ( portTickType ) 0 );
|
xQueueSend( xQueue, ( void * ) &pxMessage, ( portTickType ) 0 );
|
|
|
// ... Rest of task code.
|
// ... Rest of task code.
|
}
|
}
|
|
|
// Task to receive from the queue.
|
// Task to receive from the queue.
|
void vADifferentTask( void *pvParameters )
|
void vADifferentTask( void *pvParameters )
|
{
|
{
|
struct AMessage *pxRxedMessage;
|
struct AMessage *pxRxedMessage;
|
|
|
if( xQueue != 0 )
|
if( xQueue != 0 )
|
{
|
{
|
// Receive a message on the created queue. Block for 10 ticks if a
|
// Receive a message on the created queue. Block for 10 ticks if a
|
// message is not immediately available.
|
// message is not immediately available.
|
if( xQueueReceive( xQueue, &( pxRxedMessage ), ( portTickType ) 10 ) )
|
if( xQueueReceive( xQueue, &( pxRxedMessage ), ( portTickType ) 10 ) )
|
{
|
{
|
// pcRxedMessage now points to the struct AMessage variable posted
|
// pcRxedMessage now points to the struct AMessage variable posted
|
// by vATask.
|
// by vATask.
|
}
|
}
|
}
|
}
|
|
|
// ... Rest of task code.
|
// ... Rest of task code.
|
}
|
}
|
</pre>
|
</pre>
|
* \defgroup xQueueReceive xQueueReceive
|
* \defgroup xQueueReceive xQueueReceive
|
* \ingroup QueueManagement
|
* \ingroup QueueManagement
|
*/
|
*/
|
signed portBASE_TYPE xQueueReceive( xQueueHandle xQueue, void *pvBuffer, portTickType xTicksToWait );
|
signed portBASE_TYPE xQueueReceive( xQueueHandle xQueue, void *pvBuffer, portTickType xTicksToWait );
|
|
|
/**
|
/**
|
* queue. h
|
* queue. h
|
* <pre>unsigned portBASE_TYPE uxQueueMessagesWaiting( xQueueHandle xQueue );</pre>
|
* <pre>unsigned portBASE_TYPE uxQueueMessagesWaiting( xQueueHandle xQueue );</pre>
|
*
|
*
|
* Return the number of messages stored in a queue.
|
* Return the number of messages stored in a queue.
|
*
|
*
|
* @param xQueue A handle to the queue being queried.
|
* @param xQueue A handle to the queue being queried.
|
*
|
*
|
* @return The number of messages available in the queue.
|
* @return The number of messages available in the queue.
|
*
|
*
|
* \page uxQueueMessagesWaiting uxQueueMessagesWaiting
|
* \page uxQueueMessagesWaiting uxQueueMessagesWaiting
|
* \ingroup QueueManagement
|
* \ingroup QueueManagement
|
*/
|
*/
|
unsigned portBASE_TYPE uxQueueMessagesWaiting( xQueueHandle xQueue );
|
unsigned portBASE_TYPE uxQueueMessagesWaiting( xQueueHandle xQueue );
|
|
|
/**
|
/**
|
* queue. h
|
* queue. h
|
* <pre>void vQueueDelete( xQueueHandle xQueue );</pre>
|
* <pre>void vQueueDelete( xQueueHandle xQueue );</pre>
|
*
|
*
|
* Delete a queue - freeing all the memory allocated for storing of items
|
* Delete a queue - freeing all the memory allocated for storing of items
|
* placed on the queue.
|
* placed on the queue.
|
*
|
*
|
* @param xQueue A handle to the queue to be deleted.
|
* @param xQueue A handle to the queue to be deleted.
|
*
|
*
|
* \page vQueueDelete vQueueDelete
|
* \page vQueueDelete vQueueDelete
|
* \ingroup QueueManagement
|
* \ingroup QueueManagement
|
*/
|
*/
|
void vQueueDelete( xQueueHandle xQueue );
|
void vQueueDelete( xQueueHandle xQueue );
|
|
|
/**
|
/**
|
* queue. h
|
* queue. h
|
* <pre>
|
* <pre>
|
portBASE_TYPE xQueueSendFromISR(
|
portBASE_TYPE xQueueSendFromISR(
|
xQueueHandle pxQueue,
|
xQueueHandle pxQueue,
|
const void *pvItemToQueue,
|
const void *pvItemToQueue,
|
portBASE_TYPE xTaskPreviouslyWoken
|
portBASE_TYPE xTaskPreviouslyWoken
|
);
|
);
|
</pre>
|
</pre>
|
*
|
*
|
* Post an item on a queue. It is safe to use this function from within an
|
* Post an item on a queue. It is safe to use this function from within an
|
* interrupt service routine.
|
* interrupt service routine.
|
*
|
*
|
* Items are queued by copy not reference so it is preferable to only
|
* Items are queued by copy not reference so it is preferable to only
|
* queue small items, especially when called from an ISR. In most cases
|
* queue small items, especially when called from an ISR. In most cases
|
* it would be preferable to store a pointer to the item being queued.
|
* it would be preferable to store a pointer to the item being queued.
|
*
|
*
|
* @param xQueue The handle to the queue on which the item is to be posted.
|
* @param xQueue The handle to the queue on which the item is to be posted.
|
*
|
*
|
* @param pvItemToQueue A pointer to the item that is to be placed on the
|
* @param pvItemToQueue A pointer to the item that is to be placed on the
|
* queue. The size of the items the queue will hold was defined when the
|
* queue. The size of the items the queue will hold was defined when the
|
* queue was created, so this many bytes will be copied from pvItemToQueue
|
* queue was created, so this many bytes will be copied from pvItemToQueue
|
* into the queue storage area.
|
* into the queue storage area.
|
*
|
*
|
* @param cTaskPreviouslyWoken This is included so an ISR can post onto
|
* @param cTaskPreviouslyWoken This is included so an ISR can post onto
|
* the same queue multiple times from a single interrupt. The first call
|
* the same queue multiple times from a single interrupt. The first call
|
* should always pass in pdFALSE. Subsequent calls should pass in
|
* should always pass in pdFALSE. Subsequent calls should pass in
|
* the value returned from the previous call. See the file serial .c in the
|
* the value returned from the previous call. See the file serial .c in the
|
* PC port for a good example of this mechanism.
|
* PC port for a good example of this mechanism.
|
*
|
*
|
* @return pdTRUE if a task was woken by posting onto the queue. This is
|
* @return pdTRUE if a task was woken by posting onto the queue. This is
|
* used by the ISR to determine if a context switch may be required following
|
* used by the ISR to determine if a context switch may be required following
|
* the ISR.
|
* the ISR.
|
*
|
*
|
* Example usage for buffered IO (where the ISR can obtain more than one value
|
* Example usage for buffered IO (where the ISR can obtain more than one value
|
* per call):
|
* per call):
|
<pre>
|
<pre>
|
void vBufferISR( void )
|
void vBufferISR( void )
|
{
|
{
|
portCHAR cIn;
|
portCHAR cIn;
|
portBASE_TYPE xTaskWokenByPost;
|
portBASE_TYPE xTaskWokenByPost;
|
|
|
// We have not woken a task at the start of the ISR.
|
// We have not woken a task at the start of the ISR.
|
cTaskWokenByPost = pdFALSE;
|
cTaskWokenByPost = pdFALSE;
|
|
|
// Loop until the buffer is empty.
|
// Loop until the buffer is empty.
|
do
|
do
|
{
|
{
|
// Obtain a byte from the buffer.
|
// Obtain a byte from the buffer.
|
cIn = portINPUT_BYTE( RX_REGISTER_ADDRESS );
|
cIn = portINPUT_BYTE( RX_REGISTER_ADDRESS );
|
|
|
// Post the byte. The first time round the loop cTaskWokenByPost
|
// Post the byte. The first time round the loop cTaskWokenByPost
|
// will be pdFALSE. If the queue send causes a task to wake we do
|
// will be pdFALSE. If the queue send causes a task to wake we do
|
// not want the task to run until we have finished the ISR, so
|
// not want the task to run until we have finished the ISR, so
|
// xQueueSendFromISR does not cause a context switch. Also we
|
// xQueueSendFromISR does not cause a context switch. Also we
|
// don't want subsequent posts to wake any other tasks, so we store
|
// don't want subsequent posts to wake any other tasks, so we store
|
// the return value back into cTaskWokenByPost so xQueueSendFromISR
|
// the return value back into cTaskWokenByPost so xQueueSendFromISR
|
// knows not to wake any task the next iteration of the loop.
|
// knows not to wake any task the next iteration of the loop.
|
xTaskWokenByPost = xQueueSendFromISR( xRxQueue, &cIn, cTaskWokenByPost );
|
xTaskWokenByPost = xQueueSendFromISR( xRxQueue, &cIn, cTaskWokenByPost );
|
|
|
} while( portINPUT_BYTE( BUFFER_COUNT ) );
|
} while( portINPUT_BYTE( BUFFER_COUNT ) );
|
|
|
// Now the buffer is empty we can switch context if necessary.
|
// Now the buffer is empty we can switch context if necessary.
|
if( cTaskWokenByPost )
|
if( cTaskWokenByPost )
|
{
|
{
|
taskYIELD ();
|
taskYIELD ();
|
}
|
}
|
}
|
}
|
</pre>
|
</pre>
|
*
|
*
|
* \defgroup xQueueSendFromISR xQueueSendFromISR
|
* \defgroup xQueueSendFromISR xQueueSendFromISR
|
* \ingroup QueueManagement
|
* \ingroup QueueManagement
|
*/
|
*/
|
signed portBASE_TYPE xQueueSendFromISR( xQueueHandle pxQueue, const void *pvItemToQueue, signed portBASE_TYPE xTaskPreviouslyWoken );
|
signed portBASE_TYPE xQueueSendFromISR( xQueueHandle pxQueue, const void *pvItemToQueue, signed portBASE_TYPE xTaskPreviouslyWoken );
|
|
|
/**
|
/**
|
* queue. h
|
* queue. h
|
* <pre>
|
* <pre>
|
portBASE_TYPE xQueueReceiveFromISR(
|
portBASE_TYPE xQueueReceiveFromISR(
|
xQueueHandle pxQueue,
|
xQueueHandle pxQueue,
|
void *pvBuffer,
|
void *pvBuffer,
|
portBASE_TYPE *pxTaskWoken
|
portBASE_TYPE *pxTaskWoken
|
);
|
);
|
* </pre>
|
* </pre>
|
*
|
*
|
* Receive an item from a queue. It is safe to use this function from within an
|
* Receive an item from a queue. It is safe to use this function from within an
|
* interrupt service routine.
|
* interrupt service routine.
|
*
|
*
|
* @param pxQueue The handle to the queue from which the item is to be
|
* @param pxQueue The handle to the queue from which the item is to be
|
* received.
|
* received.
|
*
|
*
|
* @param pvBuffer Pointer to the buffer into which the received item will
|
* @param pvBuffer Pointer to the buffer into which the received item will
|
* be copied.
|
* be copied.
|
*
|
*
|
* @param pxTaskWoken A task may be blocked waiting for space to become
|
* @param pxTaskWoken A task may be blocked waiting for space to become
|
* available on the queue. If xQueueReceiveFromISR causes such a task to
|
* available on the queue. If xQueueReceiveFromISR causes such a task to
|
* unblock *pxTaskWoken will get set to pdTRUE, otherwise *pxTaskWoken will
|
* unblock *pxTaskWoken will get set to pdTRUE, otherwise *pxTaskWoken will
|
* remain unchanged.
|
* remain unchanged.
|
*
|
*
|
* @return pdTRUE if an item was successfully received from the queue,
|
* @return pdTRUE if an item was successfully received from the queue,
|
* otherwise pdFALSE.
|
* otherwise pdFALSE.
|
*
|
*
|
* Example usage:
|
* Example usage:
|
<pre>
|
<pre>
|
|
|
xQueueHandle xQueue;
|
xQueueHandle xQueue;
|
|
|
// Function to create a queue and post some values.
|
// Function to create a queue and post some values.
|
void vAFunction( void *pvParameters )
|
void vAFunction( void *pvParameters )
|
{
|
{
|
portCHAR cValueToPost;
|
portCHAR cValueToPost;
|
const portTickType xBlockTime = ( portTickType )0xff;
|
const portTickType xBlockTime = ( portTickType )0xff;
|
|
|
// Create a queue capable of containing 10 characters.
|
// Create a queue capable of containing 10 characters.
|
xQueue = xQueueCreate( 10, sizeof( portCHAR ) );
|
xQueue = xQueueCreate( 10, sizeof( portCHAR ) );
|
if( xQueue == 0 )
|
if( xQueue == 0 )
|
{
|
{
|
// Failed to create the queue.
|
// Failed to create the queue.
|
}
|
}
|
|
|
// ...
|
// ...
|
|
|
// Post some characters that will be used within an ISR. If the queue
|
// Post some characters that will be used within an ISR. If the queue
|
// is full then this task will block for xBlockTime ticks.
|
// is full then this task will block for xBlockTime ticks.
|
cValueToPost = 'a';
|
cValueToPost = 'a';
|
xQueueSend( xQueue, ( void * ) &cValueToPost, xBlockTime );
|
xQueueSend( xQueue, ( void * ) &cValueToPost, xBlockTime );
|
cValueToPost = 'b';
|
cValueToPost = 'b';
|
xQueueSend( xQueue, ( void * ) &cValueToPost, xBlockTime );
|
xQueueSend( xQueue, ( void * ) &cValueToPost, xBlockTime );
|
|
|
// ... keep posting characters ... this task may block when the queue
|
// ... keep posting characters ... this task may block when the queue
|
// becomes full.
|
// becomes full.
|
|
|
cValueToPost = 'c';
|
cValueToPost = 'c';
|
xQueueSend( xQueue, ( void * ) &cValueToPost, xBlockTime );
|
xQueueSend( xQueue, ( void * ) &cValueToPost, xBlockTime );
|
}
|
}
|
|
|
// ISR that outputs all the characters received on the queue.
|
// ISR that outputs all the characters received on the queue.
|
void vISR_Routine( void )
|
void vISR_Routine( void )
|
{
|
{
|
portBASE_TYPE xTaskWokenByReceive = pdFALSE;
|
portBASE_TYPE xTaskWokenByReceive = pdFALSE;
|
portCHAR cRxedChar;
|
portCHAR cRxedChar;
|
|
|
while( xQueueReceiveFromISR( xQueue, ( void * ) &cRxedChar, &xTaskWokenByReceive) )
|
while( xQueueReceiveFromISR( xQueue, ( void * ) &cRxedChar, &xTaskWokenByReceive) )
|
{
|
{
|
// A character was received. Output the character now.
|
// A character was received. Output the character now.
|
vOutputCharacter( cRxedChar );
|
vOutputCharacter( cRxedChar );
|
|
|
// If removing the character from the queue woke the task that was
|
// If removing the character from the queue woke the task that was
|
// posting onto the queue cTaskWokenByReceive will have been set to
|
// posting onto the queue cTaskWokenByReceive will have been set to
|
// pdTRUE. No matter how many times this loop iterates only one
|
// pdTRUE. No matter how many times this loop iterates only one
|
// task will be woken.
|
// task will be woken.
|
}
|
}
|
|
|
if( cTaskWokenByPost != ( portCHAR ) pdFALSE;
|
if( cTaskWokenByPost != ( portCHAR ) pdFALSE;
|
{
|
{
|
taskYIELD ();
|
taskYIELD ();
|
}
|
}
|
}
|
}
|
</pre>
|
</pre>
|
* \defgroup xQueueReceiveFromISR xQueueReceiveFromISR
|
* \defgroup xQueueReceiveFromISR xQueueReceiveFromISR
|
* \ingroup QueueManagement
|
* \ingroup QueueManagement
|
*/
|
*/
|
signed portBASE_TYPE xQueueReceiveFromISR( xQueueHandle pxQueue, void *pvBuffer, signed portBASE_TYPE *pxTaskWoken );
|
signed portBASE_TYPE xQueueReceiveFromISR( xQueueHandle pxQueue, void *pvBuffer, signed portBASE_TYPE *pxTaskWoken );
|
|
|
|
|
/*
|
/*
|
* The functions defined above are for passing data to and from tasks. The
|
* The functions defined above are for passing data to and from tasks. The
|
* functions below are the equivalents for passing data to and from
|
* functions below are the equivalents for passing data to and from
|
* co-rtoutines.
|
* co-rtoutines.
|
*
|
*
|
* These functions are called from the co-routine macro implementation and
|
* These functions are called from the co-routine macro implementation and
|
* should not be called directly from application code. Instead use the macro
|
* should not be called directly from application code. Instead use the macro
|
* wrappers defined within croutine.h.
|
* wrappers defined within croutine.h.
|
*/
|
*/
|
signed portBASE_TYPE xQueueCRSendFromISR( xQueueHandle pxQueue, const void *pvItemToQueue, signed portBASE_TYPE xCoRoutinePreviouslyWoken );
|
signed portBASE_TYPE xQueueCRSendFromISR( xQueueHandle pxQueue, const void *pvItemToQueue, signed portBASE_TYPE xCoRoutinePreviouslyWoken );
|
signed portBASE_TYPE xQueueCRReceiveFromISR( xQueueHandle pxQueue, void *pvBuffer, signed portBASE_TYPE *pxTaskWoken );
|
signed portBASE_TYPE xQueueCRReceiveFromISR( xQueueHandle pxQueue, void *pvBuffer, signed portBASE_TYPE *pxTaskWoken );
|
signed portBASE_TYPE xQueueCRSend( xQueueHandle pxQueue, const void *pvItemToQueue, portTickType xTicksToWait );
|
signed portBASE_TYPE xQueueCRSend( xQueueHandle pxQueue, const void *pvItemToQueue, portTickType xTicksToWait );
|
signed portBASE_TYPE xQueueCRReceive( xQueueHandle pxQueue, void *pvBuffer, portTickType xTicksToWait );
|
signed portBASE_TYPE xQueueCRReceive( xQueueHandle pxQueue, void *pvBuffer, portTickType xTicksToWait );
|
|
|
#endif
|
#endif
|
|
|
|
|
