boards/evkmimx8mq/rtos_examples/freertos_event/freertos_event.c

/*
 * Copyright (c) 2015, Freescale Semiconductor, Inc.
 * Copyright 2016-2017 NXP
 * All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

/* FreeRTOS kernel includes. */
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"
#include "timers.h"
#include "event_groups.h"

/* Freescale includes. */
#include "fsl_device_registers.h"
#include "fsl_debug_console.h"
#include "board.h"

#include "pin_mux.h"
#include "clock_config.h"
/*******************************************************************************
 * Definitions
 ******************************************************************************/

#define B0 (1 << 0)
#define B1 (1 << 1)

/*******************************************************************************
 * Prototypes
 ******************************************************************************/
static void write_task_1(void *pvParameters);
static void write_task_2(void *pvParameters);
static void read_task(void *pvParameters);
/*******************************************************************************
 * Globals
 ******************************************************************************/
static EventGroupHandle_t event_group = NULL;

/*******************************************************************************
 * Code
 ******************************************************************************/
/*!
 * @brief Main function
 */
int main(void)
{
    /* Board specific RDC settings */
    BOARD_RdcInit();

    BOARD_InitBootPins();
    BOARD_BootClockRUN();
    BOARD_InitDebugConsole();
    BOARD_InitMemory();
    event_group = xEventGroupCreate();
    if (xTaskCreate(write_task_1, "WRITE_TASK_1", configMINIMAL_STACK_SIZE + 100, NULL, tskIDLE_PRIORITY + 1, NULL) !=
        pdPASS)
    {
        PRINTF("Task creation failed!.\r\n");
        while (1)
            ;
    }
    if (xTaskCreate(write_task_2, "WRITE_TASK_2", configMINIMAL_STACK_SIZE + 100, NULL, tskIDLE_PRIORITY + 1, NULL) !=
        pdPASS)
    {
        PRINTF("Task creation failed!.\r\n");
        while (1)
            ;
    }
    if (xTaskCreate(read_task, "READ_TASK", configMINIMAL_STACK_SIZE + 100, NULL, tskIDLE_PRIORITY + 2, NULL) != pdPASS)
    {
        PRINTF("Task creation failed!.\r\n");
        while (1)
            ;
    }
    /* Start scheduling. */
    vTaskStartScheduler();
    for (;;)
        ;
}

/*!
 * @brief write_task_1 function
 */
static void write_task_1(void *pvParameters)
{
    while (1)
    {
        xEventGroupSetBits(event_group, B0);
    }
}

/*!
 * @brief write_task_2 function
 */
static void write_task_2(void *pvParameters)
{
    while (1)
    {
        xEventGroupSetBits(event_group, B1);
    }
}

/*!
 * @brief read_task function
 */
static void read_task(void *pvParameters)
{
    EventBits_t event_bits;
    while (1)
    {
        event_bits = xEventGroupWaitBits(event_group,    /* The event group handle. */
                                         B0 | B1,        /* The bit pattern the event group is waiting for. */
                                         pdTRUE,         /* BIT_0 and BIT_4 will be cleared automatically. */
                                         pdFALSE,        /* Don't wait for both bits, either bit unblock task. */
                                         portMAX_DELAY); /* Block indefinitely to wait for the condition to be met. */

        if ((event_bits & (B0 | B1)) == (B0 | B1))
        {
            PRINTF("Both bits are set.");
        }
        else if ((event_bits & B0) == B0)
        {
            PRINTF("Bit B0 is set.\r\n");
        }
        else if ((event_bits & B1) == B1)
        {
            PRINTF("Bit B1 is set.\r\n");
        }
    }
}