191 lines
7.6 KiB
C
191 lines
7.6 KiB
C
/*
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FreeRTOS V6.1.0 - Copyright (C) 2010 Real Time Engineers Ltd.
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***************************************************************************
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* *
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* If you are: *
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* *
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* + New to FreeRTOS, *
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* + Wanting to learn FreeRTOS or multitasking in general quickly *
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* + Looking for basic training, *
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* + Wanting to improve your FreeRTOS skills and productivity *
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* *
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* then take a look at the FreeRTOS books - available as PDF or paperback *
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* *
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* "Using the FreeRTOS Real Time Kernel - a Practical Guide" *
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* http://www.FreeRTOS.org/Documentation *
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* *
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* A pdf reference manual is also available. Both are usually delivered *
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* to your inbox within 20 minutes to two hours when purchased between 8am *
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* and 8pm GMT (although please allow up to 24 hours in case of *
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* exceptional circumstances). Thank you for your support! *
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* *
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***************************************************************************
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This file is part of the FreeRTOS distribution.
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FreeRTOS is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License (version 2) as published by the
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Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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***NOTE*** The exception to the GPL is included to allow you to distribute
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a combined work that includes FreeRTOS without being obliged to provide the
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source code for proprietary components outside of the FreeRTOS kernel.
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FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details. You should have received a copy of the GNU General Public
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License and the FreeRTOS license exception along with FreeRTOS; if not it
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can be viewed here: http://www.freertos.org/a00114.html and also obtained
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by writing to Richard Barry, contact details for whom are available on the
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FreeRTOS WEB site.
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http://www.FreeRTOS.org - Documentation, latest information, license and
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contact details.
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http://www.SafeRTOS.com - A version that is certified for use in safety
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critical systems.
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http://www.OpenRTOS.com - Commercial support, development, porting,
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licensing and training services.
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*/
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/*
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* This is a very simple demo that demonstrates task and queue usages only.
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* Details of other FreeRTOS features (API functions, tracing features,
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* diagnostic hook functions, memory management, etc.) can be found on the
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* FreeRTOS web site (http://www.FreeRTOS.org) and in the FreeRTOS book.
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* Details of this demo (what it does, how it should behave, etc.) can be found
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* in the accompanying PDF application note.
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*
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*/
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/* Kernel includes. */
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#include <FreeRTOS.h>
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#include <openbeacon.h>
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#include <task.h>
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#include <queue.h>
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#include "config.h"
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/* Priorities at which the tasks are created. */
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#define mainQUEUE_RECEIVE_TASK_PRIORITY ( tskIDLE_PRIORITY + 2 )
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#define mainQUEUE_SEND_TASK_PRIORITY ( tskIDLE_PRIORITY + 1 )
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/* The rate at which data is sent to the queue, specified in milliseconds. */
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#define mainQUEUE_SEND_FREQUENCY_MS ( 500 / portTICK_RATE_MS )
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/* The number of items the queue can hold. This is 1 as the receive task
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will remove items as they are added, meaning the send task should always find
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the queue empty. */
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#define mainQUEUE_LENGTH ( 1 )
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/*
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* The tasks as described in the accompanying PDF application note.
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*/
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static void prvQueueReceiveTask (void *pvParameters);
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static void prvQueueSendTask (void *pvParameters);
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/* The queue used by both tasks. */
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static xQueueHandle xQueue = NULL;
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/*-----------------------------------------------------------*/
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int
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main (void)
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{
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/* Initialize GPIO (sets up clock) */
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GPIOInit ();
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/* Set LED port pin to output */
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GPIOSetDir (LED_PORT, LED_BIT, 1);
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GPIOSetValue (LED_PORT, LED_BIT, 0);
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/* Create the queue. */
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xQueue = xQueueCreate (mainQUEUE_LENGTH, sizeof (unsigned long));
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if (xQueue != NULL)
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{
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/* Start the two tasks as described in the accompanying application
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note. */
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xTaskCreate (prvQueueReceiveTask, (signed char *) "Rx",
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configMINIMAL_STACK_SIZE, NULL,
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mainQUEUE_RECEIVE_TASK_PRIORITY, NULL);
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xTaskCreate (prvQueueSendTask, (signed char *) "TX",
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configMINIMAL_STACK_SIZE, NULL,
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mainQUEUE_SEND_TASK_PRIORITY, NULL);
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/* Start the tasks running. */
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vTaskStartScheduler ();
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}
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/* If all is well we will never reach here as the scheduler will now be
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running. If we do reach here then it is likely that there was insufficient
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heap available for the idle task to be created. */
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for (;;);
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}
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/*-----------------------------------------------------------*/
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static void
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prvQueueSendTask (void *pvParameters)
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{
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portTickType xNextWakeTime;
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unsigned long ulValueToSend;
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(void) pvParameters;
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/* Initialise xNextWakeTime - this only needs to be done once. */
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xNextWakeTime = xTaskGetTickCount ();
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for (;;)
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{
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/* Place this task in the blocked state until it is time to run again.
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The block state is specified in ticks, the constant used converts ticks
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to ms. While in the blocked state this task will not consume any CPU
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time. */
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vTaskDelayUntil (&xNextWakeTime, mainQUEUE_SEND_FREQUENCY_MS);
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/* Send to the queue - causing the queue receive task to flash its LED.
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0 is used as the block time so the sending operation will not block -
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it shouldn't need to block as the queue should always be empty at this
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point in the code. */
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ulValueToSend = 100;
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xQueueSend (xQueue, &ulValueToSend, 0);
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/* Place this task in the blocked state until it is time to run again.
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The block state is specified in ticks, the constant used converts ticks
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to ms. While in the blocked state this task will not consume any CPU
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time. */
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vTaskDelayUntil (&xNextWakeTime, mainQUEUE_SEND_FREQUENCY_MS);
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/* Send to the queue - causing the queue receive task to flash its LED.
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0 is used as the block time so the sending operation will not block -
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it shouldn't need to block as the queue should always be empty at this
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point in the code. */
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ulValueToSend = 0;
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xQueueSend (xQueue, &ulValueToSend, 0);
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}
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}
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/*-----------------------------------------------------------*/
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static void
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prvQueueReceiveTask (void *pvParameters)
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{
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unsigned long ulReceivedValue;
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(void) pvParameters;
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for (;;)
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{
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/* Wait until something arrives in the queue - this task will block
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indefinitely provided INCLUDE_vTaskSuspend is set to 1 in
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FreeRTOSConfig.h. */
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xQueueReceive (xQueue, &ulReceivedValue, portMAX_DELAY);
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/* To get here something must have been received from the queue, but
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is it the expected value? If it is, toggle the LED. */
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if (ulReceivedValue == 100UL)
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GPIOSetValue (LED_PORT, LED_BIT, 1);
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else
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GPIOSetValue (LED_PORT, LED_BIT, 0);
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}
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}
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