[freertos] add freertos firmware

Change-Id: I4158d66d9b5fc444e28287f55e79ac24e0a1666f

freertos/cvitek/task/demo/Common/Minimal/flash.c

@@ -0,0 +1,117 @@
+/*
+ * FreeRTOS Kernel V10.3.0
+ * 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.
+ *
+ * http://www.FreeRTOS.org
+ * http://aws.amazon.com/freertos
+ *
+ * 1 tab == 4 spaces!
+ */
+
+/**
+ * This version of flash .c is for use on systems that have limited stack space
+ * and no display facilities.  The complete version can be found in the
+ * Demo/Common/Full directory.
+ *
+ * Three tasks are created, each of which flash an LED at a different rate.  The first
+ * LED flashes every 200ms, the second every 400ms, the third every 600ms.
+ *
+ * The LED flash tasks provide instant visual feedback.  They show that the scheduler
+ * is still operational.
+ *
+ */
+
+#include <stdlib.h>
+
+/* Scheduler include files. */
+#include "FreeRTOS.h"
+#include "task.h"
+
+/* Demo program include files. */
+#include "partest.h"
+#include "flash.h"
+
+#define ledSTACK_SIZE configMINIMAL_STACK_SIZE
+#define ledNUMBER_OF_LEDS (3)
+#define ledFLASH_RATE_BASE ((TickType_t)333)
+
+/* Variable used by the created tasks to calculate the LED number to use, and
+the rate at which they should flash the LED. */
+static volatile UBaseType_t uxFlashTaskNumber = 0;
+
+/* The task that is created three times. */
+static portTASK_FUNCTION_PROTO(vLEDFlashTask, pvParameters);
+
+/*-----------------------------------------------------------*/
+
+void vStartLEDFlashTasks(UBaseType_t uxPriority)
+{
+	BaseType_t xLEDTask;
+
+	/* Create the three tasks. */
+	for (xLEDTask = 0; xLEDTask < ledNUMBER_OF_LEDS; ++xLEDTask) {
+		/* Spawn the task. */
+		xTaskCreate(vLEDFlashTask, "LEDx", ledSTACK_SIZE, NULL,
+			    uxPriority, (TaskHandle_t *)NULL);
+	}
+}
+/*-----------------------------------------------------------*/
+
+static portTASK_FUNCTION(vLEDFlashTask, pvParameters)
+{
+	TickType_t xFlashRate, xLastFlashTime;
+	UBaseType_t uxLED;
+
+	/* The parameters are not used. */
+	(void)pvParameters;
+
+	/* Calculate the LED and flash rate. */
+	portENTER_CRITICAL();
+	{
+		/* See which of the eight LED's we should use. */
+		uxLED = uxFlashTaskNumber;
+
+		/* Update so the next task uses the next LED. */
+		uxFlashTaskNumber++;
+	}
+	portEXIT_CRITICAL();
+
+	xFlashRate =
+		ledFLASH_RATE_BASE + (ledFLASH_RATE_BASE * (TickType_t)uxLED);
+	xFlashRate /= portTICK_PERIOD_MS;
+
+	/* We will turn the LED on and off again in the delay period, so each
+	delay is only half the total period. */
+	xFlashRate /= (TickType_t)2;
+
+	/* We need to initialise xLastFlashTime prior to the first call to
+	vTaskDelayUntil(). */
+	xLastFlashTime = xTaskGetTickCount();
+
+	for (;;) {
+		/* Delay for half the flash period then turn the LED on. */
+		vTaskDelayUntil(&xLastFlashTime, xFlashRate);
+		vParTestToggleLED(uxLED);
+
+		/* Delay for half the flash period then turn the LED off. */
+		vTaskDelayUntil(&xLastFlashTime, xFlashRate);
+		vParTestToggleLED(uxLED);
+	}
+} /*lint !e715 !e818 !e830 Function definition must be standard for task creation. */