/*
 * FreeRTOS Kernel V10.0.1
 * Copyright (C) 2017 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!
 */

/*
 *******************************************************************************
 * -NOTE- The Win32 port is a simulation (or is that emulation?) only!  Do not
 * expect to get real time behaviour from the Win32 port or this demo
 * application.  It is provided as a convenient development and demonstration
 * test bed only.  This was tested using Windows XP on a dual core laptop.
 *
 * - READ THE WEB DOCUMENTATION FOR THIS PORT FOR MORE INFORMATION ON USING IT -
 * - http://www.freertos.org/FreeRTOS-Windows-Simulator-Emulator-for-Visual-Studio-and-Eclipse-MingW.html
 * - Note that the above linked page describes the simulator environment.  It
 * - is not the correct page to view for information on using this lwIP demo.
 *******************************************************************************
 *
 * This project demonstrates use of the lwIP stack.  The lwIP raw API is
 * demonstrated by a simple http server that comes as part of the lwIP
 * distribution - and executes in the tcpip task.  The lwIP sockets API
 * is demonstrated by a simple command line interpreter interface, which
 * executes in its own task.
 *
 * Both the http and command line server can be used to view task stats, and
 * run time stats.  Task stats give a snapshot of the state of each task in
 * the system.  Run time stats show how much processing time has been allocated
 * to each task.  A few of the standard demo tasks are created, just to ensure
 * there is some data to be viewed.
 *
 * Finally, a check timer is created.  The check timer is a software timer that
 * inspects the few standard demo tasks that are created to ensure they are
 * executing as expected.  It maintains a status string that can be viewed on
 * the "task stats" page served by the web server.
 *
 * More information about this demo, including details of how to set up the
 * network interface, and the command line commands that are available, is
 * available on the documentation page for this demo on the
 * http://www.FreeRTOS.org web site.
 *
 */


/* Standard includes. */
#include <stdio.h>

/* Kernel includes. */
#include <FreeRTOS.h>
#include "task.h"
#include "timers.h"

/* Standard demo includes. */
#include "GenQTest.h"

/* lwIP includes. */
#include "lwip/tcpip.h"
#include "lwIP_Apps.h"

/* Utils includes. */
#include "CommandInterpreter.h"

/* Priorities at which the tasks are created. */
#define mainGEN_QUEUE_TASK_PRIORITY	( tskIDLE_PRIORITY )

/* The period at which the check timer will expire, in ms, provided no errors
have been reported by any of the standard demo tasks.  ms are converted to the
equivalent in ticks using the portTICK_PERIOD_MS constant. */
#define mainCHECK_TIMER_PERIOD_MS			( 3000UL / portTICK_PERIOD_MS )

/* Check timer callback function. */
static void prvCheckTimerCallback( TimerHandle_t xTimer );

/* Defined in lwIPApps.c. */
extern void lwIPAppsInit( void *pvArguments );

/* Callbacks to handle the command line commands defined by the xTaskStats and
xRunTimeStats command definitions respectively.  These functions are not
necessarily reentrant!  They must be used from one task only - or at least by
only one task at a time. */
static portBASE_TYPE prvTaskStatsCommand( signed char *pcWriteBuffer, size_t xWriteBufferLen, const signed char * pcCommandString );
static portBASE_TYPE prvRunTimeStatsCommand( signed char *pcWriteBuffer, size_t xWriteBufferLen, const signed char * pcCommandString );

/* The string that latches the current demo status. */
static char *pcStatusMessage = "All tasks running without error";

/* Variables used in the creation of the run time stats time base.  Run time
stats record how much time each task spends in the Running state. */
long long llInitialRunTimeCounterValue = 0LL, llRunTimeStatsDivisor = 0LL;

/* The check timer.  This uses prvCheckTimerCallback() as its callback
function. */
static TimerHandle_t xCheckTimer = NULL;

/* Structure that defines the "run-time-stats" command line command. */
static const xCommandLineInput xRunTimeStats =
{
	"run-time-stats",
	"run-time-stats: Displays a table showing how much processing time each FreeRTOS task has used\r\n",
	prvRunTimeStatsCommand,
	0
};

/* Structure that defines the "task-stats" command line command. */
static const xCommandLineInput xTaskStats =
{
	"task-stats",
	"task-stats: Displays a table showing the state of each FreeRTOS task\r\n",
	prvTaskStatsCommand,
	0
};

/*-----------------------------------------------------------*/

int main( void )
{
const unsigned long ulLongTime_ms = 1000UL;

	/* This call creates the TCP/IP thread. */
	tcpip_init( lwIPAppsInit, NULL );

	/* Create and start the check timer, as described at the top of this file. */
	xCheckTimer = xTimerCreate( "CheckTimer",/* A text name, purely to help debugging. */
								( mainCHECK_TIMER_PERIOD_MS ),		/* The timer period, in this case 3000ms (3s). */
								pdTRUE,								/* This is an auto-reload timer, so xAutoReload is set to pdTRUE. */
								( void * ) 0,						/* The ID is not used, so can be set to anything. */
								prvCheckTimerCallback				/* The callback function that inspects the status of all the other tasks. */
							  );

	/* Sanity check that the timer was created. */
	configASSERT( xCheckTimer );

	/* Start the check timer. */
	xTimerStart( xCheckTimer, 0UL );

	/* Create a few standard demo tasks, just so there are tasks running to
	view on the web server and via the command line command interpreter. */
	vStartGenericQueueTasks( mainGEN_QUEUE_TASK_PRIORITY );

	/* Register two command line commands to show task stats and run time stats
	respectively. */
	xCmdIntRegisterCommand( &xTaskStats );
	xCmdIntRegisterCommand( &xRunTimeStats );

	/* Start the scheduler itself. */
	vTaskStartScheduler();

	/* This line should never be reached.  If it does execute then there was
	insufficient FreeRTOS heap memory available for the idle and/or timer
	tasks to be created. */
	for( ;; )
	{
		Sleep( ulLongTime_ms );
	}
}
/*-----------------------------------------------------------*/

static void prvCheckTimerCallback( TimerHandle_t xTimer )
{
	/* The parameter is not used in this case. */
	( void ) xTimer;

	/* Check the standard demo tasks are running without error.   Latch the
	latest reported error in the pcStatusMessage character pointer.  The latched
	string can be viewed using the embedded web server and the command line
	interpreter.  This project is really to demonstrate the lwIP stack - so very
	few tasks are created - and those that are created are created purely so
	there is something to view. */
	if( xAreGenericQueueTasksStillRunning() != pdTRUE )
	{
		pcStatusMessage = "Error: The GenQueue test reported an error.";
	}
}
/*-----------------------------------------------------------*/

void vApplicationIdleHook( void )
{
const unsigned long ulMSToSleep = 5;

	/* Sleep to reduce CPU load, but don't sleep indefinitely in case there are
	tasks waiting to be terminated by the idle task. */
	Sleep( ulMSToSleep );
}
/*-----------------------------------------------------------*/

void vApplicationMallocFailedHook( void )
{
const unsigned long ulLongSleep = 1000UL;

	/* Can be implemented if required, but probably not required in this
	environment and running this demo. */
	taskDISABLE_INTERRUPTS();
	for( ;; )
	{
		Sleep( ulLongSleep );
	}
}
/*-----------------------------------------------------------*/

void vApplicationStackOverflowHook( void )
{
const unsigned long ulLongSleep = 1000UL;

	/* Can be implemented if required, but probably not required in this
	environment and running this demo. */
	taskDISABLE_INTERRUPTS();
	for( ;; )
	{
		Sleep( ulLongSleep );
	}
}
/*-----------------------------------------------------------*/

void vAssertCalled( void )
{
const unsigned long ulLongSleep = 1000UL;

	taskDISABLE_INTERRUPTS();
	for( ;; )
	{
		Sleep( ulLongSleep );
	}
}
/*-----------------------------------------------------------*/

char *pcMainGetTaskStatusMessage( void )
{
	return pcStatusMessage;
}
/*-----------------------------------------------------------*/

void vMainConfigureTimerForRunTimeStats( void )
{
LARGE_INTEGER liPerformanceCounterFrequency, liInitialRunTimeValue;

	/* Initialise the variables used to create the run time stats time base.
	Run time stats record how much time each task spends in the Running
	state. */

	if( QueryPerformanceFrequency( &liPerformanceCounterFrequency ) == 0 )
	{
		llRunTimeStatsDivisor = 1;
	}
	else
	{
		/* How many times does the performance counter increment in 10ms? */
		llRunTimeStatsDivisor = liPerformanceCounterFrequency.QuadPart / 1000LL;

		/* What is the performance counter value now, this will be subtracted
		from readings taken at run time. */
		QueryPerformanceCounter( &liInitialRunTimeValue );
		llInitialRunTimeCounterValue = liInitialRunTimeValue.QuadPart;
	}
}
/*-----------------------------------------------------------*/

unsigned long ulMainGetRunTimeCounterValue( void )
{
LARGE_INTEGER liCurrentCount;
unsigned long ulReturn;

	/* What is the performance counter value now? */
	QueryPerformanceCounter( &liCurrentCount );

	/* Subtract the performance counter value reading taken when the
	application started to get a count from that reference point, then
	scale to a 32 bit number. */
	ulReturn = ( unsigned long ) ( ( liCurrentCount.QuadPart - llInitialRunTimeCounterValue ) / llRunTimeStatsDivisor );

	return ulReturn;
}
/*-----------------------------------------------------------*/

static portBASE_TYPE prvTaskStatsCommand( signed char *pcWriteBuffer, size_t xWriteBufferLen, const signed char * pcCommandString )
{
const char *const pcHeader = "Task          State  Priority  Stack	#\r\n************************************************\r\n";

	configASSERT( pcWriteBuffer );

	/* This function assumes the buffer length is adequate and does not look
	for parameters. */
	( void ) xWriteBufferLen;
	( void ) pcCommandString;

	/* Generate a table of task stats. */
	strcpy( pcWriteBuffer, pcHeader );
	vTaskList( pcWriteBuffer + strlen( pcHeader ) );

	/* There is no more data to return after this single string, so return
	pdFALSE. */
	return pdFALSE;
}
/*-----------------------------------------------------------*/

static portBASE_TYPE prvRunTimeStatsCommand( signed char *pcWriteBuffer, size_t xWriteBufferLen, const signed char * pcCommandString )
{
const char * const pcHeader = "Task            Abs Time      % Time\r\n****************************************\r\n";

	configASSERT( pcWriteBuffer );

	/* This function assumes the buffer length is adequate and does not look
	for parameters. */
	( void ) xWriteBufferLen;
	( void ) pcCommandString;

	/* Generate a table of task stats. */
	strcpy( pcWriteBuffer, pcHeader );
	vTaskGetRunTimeStats( ( char * ) pcWriteBuffer + strlen( pcHeader ) );

	/* There is no more data to return after this single string, so return
	pdFALSE. */
	return pdFALSE;
}