[修改] 增加freeRTOS

1. 版本FreeRTOSv202212.01，命名为kernel；

kernel/FreeRTOS/Demo/NEC_78K0R_IAR/ButtonTask.c

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+/*
+ * FreeRTOS V202212.01
+ * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+/*
+ * This file defines the button push task and ISR as described at the top of
+ * main.c.  The ISR is called from a wrapper function defined in ButtonISR.s26.
+ */
+
+/* Kernel includes. */
+#include "FreeRTOS.h"
+#include "task.h"
+#include "semphr.h"
+
+/* The LED output used by the button push task. */
+#define butLED1   P7_bit.no7
+
+/* A short delay used for button debouncing. */
+#define butDEBOUNCE_DELAY	( 200 / portTICK_PERIOD_MS )
+
+/* The semaphore used to synchronise the button push task with the interrupt. */
+static SemaphoreHandle_t xButtonSemaphore;
+
+/*
+ * The definition of the button task itself.  See the comments at the top of
+ * main.c.
+ */
+void vButtonTask( void *pvParameters )
+{
+	/* Ensure the semaphore is created before it gets used. */
+	vSemaphoreCreateBinary( xButtonSemaphore );
+
+	for( ;; )
+	{
+		/* Block on the semaphore to wait for an interrupt event.  The semaphore
+		is 'given' from vButtonISRHandler() below.  Using portMAX_DELAY as the
+		block time will cause the task to block indefinitely provided
+		INCLUDE_vTaskSuspend is set to 1 in FreeRTOSConfig.h. */
+		xSemaphoreTake( xButtonSemaphore, portMAX_DELAY );
+
+		/* The button must have been pushed for this line to be executed.
+		Simply toggle the LED. */
+		butLED1 = !butLED1;
+
+		/* Wait a short time then clear any pending button pushes as a crude
+		method of debouncing the switch.  xSemaphoreTake() uses a block time of
+		zero this time so it returns immediately rather than waiting for the
+		interrupt to occur. */
+		vTaskDelay( butDEBOUNCE_DELAY );
+		xSemaphoreTake( xButtonSemaphore, 0 );
+	}
+}
+/*-----------------------------------------------------------*/
+
+/*
+ * The C portion of the interrupt handler.  Interrupts are triggered by pushing
+ * the button on the target board.  This interrupt can cause a context switch
+ * so has an assembly file wrapper defined within ButtonISR.s26.
+ */
+void vButtonISRHandler( void )
+{
+short sHigherPriorityTaskWoken = pdFALSE;
+
+	/* 'Give' the semaphore to unblock the button task. */
+	xSemaphoreGiveFromISR( xButtonSemaphore, &sHigherPriorityTaskWoken );
+
+	/* If giving the semaphore unblocked a task, and the unblocked task has a
+	priority that is higher than the currently running task, then
+	sHigherPriorityTaskWoken will have been set to pdTRUE.  Passing a pdTRUE
+	value to portYIELD_FROM_ISR() will cause this interrupt to return directly
+	to the higher priority unblocked task. */
+	portYIELD_FROM_ISR( sHigherPriorityTaskWoken );
+}
+/*-----------------------------------------------------------*/