Added a template port and updated the CMakeLists

portable/template/port.c

@@ -0,0 +1,79 @@
+
+/* TODO: Replace the copyright and license with YOUR copyright and license */
+/*
+ * FreeRTOS Kernel <DEVELOPMENT BRANCH>
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * 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
+ *
+ */
+
+#include "FreeRTOS.h"
+#include "task.h"
+
+/* Constant used for context switch macro when we require the interrupt
+ * enable state to be unchanged when the interrupted task is switched back in. */
+#define portINTERRUPTS_UNCHANGED            0x00
+
+BaseType_t xPortStartScheduler( void )
+{
+    return pdTRUE;
+}
+
+StackType_t * pxPortInitialiseStack( StackType_t * pxTopOfStack,
+                                     TaskFunction_t pxCode,
+                                     void * pvParameters )
+{
+    return NULL;
+}
+
+void vPortEndScheduler( void )
+{
+    /* It is unlikely that the scheduler for the PIC port will get stopped
+     * once running.  If required disable the tick interrupt here, then return
+     * to xPortStartScheduler(). */
+}
+
+void vPortYield( void )
+{
+
+    /* Save the current Context */
+    /* Switch to the highest priority task that is ready to run. */
+    vTaskSwitchContext();
+    /* Start executing the task we have just switched to. */
+}
+
+static void prvTickISR( void )
+{
+    /* Interrupts must have been enabled for the ISR to fire, so we have to
+     * save the context with interrupts enabled. */
+
+    /* Maintain the tick count. */
+    if( xTaskIncrementTick() != pdFALSE )
+    {
+        /* Switch to the highest priority task that is ready to run. */
+        vTaskSwitchContext();
+    }
+
+    /* start executing the new task */
+}