[修改] 增加freeRTOS

1. 版本FreeRTOSv202212.01，命名为kernel；

kernel/FreeRTOS/Demo/PIC18_WizC/Demo1/interrupt.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
+ *
+ */
+
+/*
+Changes from V3.0.0
+	+ Added functionality to only call vTaskSwitchContext() once
+	  when handling multiple interruptsources in a single interruptcall.
+
+	+ Included Filenames changed to a .c extension to allow stepping through
+	  code using F7.
+
+Changes from V3.0.1
+*/
+
+#include <pic.h>
+
+/* Scheduler include files. */
+#include <FreeRTOS.h>
+#include <task.h>
+#include <queue.h>
+
+static bit uxSwitchRequested;
+
+/*
+ * Vector for the ISR.
+ */
+void pointed Interrupt()
+{
+	/*
+	 * Save the context of the current task.
+	 */
+	portSAVE_CONTEXT( portINTERRUPTS_FORCED );
+
+	/*
+	 * No contextswitch requested yet
+	 */
+	uxSwitchRequested	= pdFALSE;
+
+	/*
+	 * Was the interrupt the FreeRTOS SystemTick?
+	 */
+	#include <libFreeRTOS/Drivers/Tick/isrTick.c>
+
+/*******************************************************************************
+** DO NOT MODIFY ANYTHING ABOVE THIS LINE
+********************************************************************************
+** Enter the includes for the ISR-code of the FreeRTOS drivers below.
+**
+** You cannot use local variables. Alternatives are:
+** - Use static variables	(Global RAM usage increases)
+** - Call a function		(Additional cycles are needed)
+** - Use unused SFR's		(preferred, no additional overhead)
+** See "../Serial/isrSerialTx.c" for an example of this last option
+*******************************************************************************/
+
+
+
+
+
+
+
+/*******************************************************************************
+** DO NOT MODIFY ANYTHING BELOW THIS LINE
+*******************************************************************************/
+	/*
+	 * Was a contextswitch requested by one of the
+	 * interrupthandlers?
+	 */
+	 if ( uxSwitchRequested )
+	 {
+	 	vTaskSwitchContext();
+	 }
+
+	/*
+	 * Restore the context of the (possibly other) task.
+	 */
+	portRESTORE_CONTEXT();
+
+	#pragma asmline retfie	0
+}