main.c

430上实现简单的web服务器

/*
	FreeRTOS V2.5.5 - Copyright (C) 2003 - 2005 Richard Barry.

	This file is part of the FreeRTOS distribution.

	FreeRTOS is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	FreeRTOS is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with FreeRTOS; if not, write to the Free Software
	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

	A special exception to the GPL can be applied should you wish to distribute
	a combined work that includes FreeRTOS, without being obliged to provide
	the source code for any proprietary components.  See the licensing section 
	of http://www.FreeRTOS.org for full details of how and when the exception
	can be applied.

	***************************************************************************
	See http://www.FreeRTOS.org for documentation, latest information, license 
	and contact details.  Please ensure to read the configuration and relevant 
	port sections of the online documentation.
	***************************************************************************
*/

/*
 * Creates all the demo application tasks, then starts the scheduler.  The WEB
 * documentation provides more details of the demo application tasks.
 * 
 * This demo is configured to execute on the EasyWeb2 prototyping board from
 * Olimex. The MSP430F149 based board has a built in 16x2 LCD display and a 
 * single LED.  Therefore, in place of flashing an LED, the 'flash' and other
 * tasks toggle characters on the LCD.  For slow events the displayed characters
 * toggle between '*' and '.'.  For faster events the characters increment from
 * ' ' to '~' allowing very fasts event to be visible (the characters will have
 * changed).  The `Check' task uses the real status LED.
 *
 * Main. c also creates a task called 'Check'.  This only executes every three 
 * seconds but has the highest priority so is guaranteed to get processor time.  
 * Its main function is to check that all the other tasks are still operational.  
 * Each task that does not flash an LED maintains a unique count that is 
 * incremented each time the task successfully completes its function.  Should 
 * any error occur within such a task the count is permanently halted.  The 
 * 'check' task inspects the count of each task to ensure it has changed since
 * the last time the check task executed.  If all the count variables have 
 * changed all the tasks are still executing error free, and the check task
 * toggles an LED with a three second period.  Should any task contain an error 
 * at any time the LED toggle rate will increase to 500ms.
 *
 * Please read the documentation for the MSP430 port available on
 * http://www.FreeRTOS.org.
 */

/* Standard includes. */
#include <io.h>
#include <stdlib.h>
#include <signal.h>

/* Scheduler includes. */
#include "projdefs.h"
#include "portable.h"
#include "task.h"

/* Demo application includes. */
#include "partest.h"
#include "flash.h"
#include "integer.h"
#include "comtest2.h"
#include "PollQ.h"

/* Constants required for hardware setup. */
#define mainALL_BITS_OUTPUT		( ( unsigned portCHAR ) 0xff )
#define mainMAX_FREQUENCY		( ( unsigned portCHAR ) 121 )

/* Constants that define the LED's used by the various tasks. [in this case
the '*' characters on the LCD represent LED's] */
#define mainCHECK_LED			( ( unsigned portCHAR ) 10 ) // was 4
#define mainCOM_TEST_LED		( ( unsigned portCHAR ) 4 ) // was 10, now 4 and 5

/* Demo task priorities. */
#define mainCHECK_TASK_PRIORITY			( tskIDLE_PRIORITY + ( unsigned portCHAR ) 3 )
#define mainCOM_TEST_PRIORITY			( tskIDLE_PRIORITY + ( unsigned portCHAR ) 2 )
#define mainQUEUE_POLL_PRIORITY			( tskIDLE_PRIORITY + ( unsigned portCHAR ) 2 )
#define mainLED_TASK_PRIORITY			( tskIDLE_PRIORITY + ( unsigned portCHAR ) 1 )

/* Baud rate used by the COM test tasks. */
#define mainCOM_TEST_BAUD_RATE			( ( unsigned portLONG ) 9600 )

/* The frequency at which the 'Check' tasks executes.  See the comments at the 
top of the page.  When the system is operating error free the 'Check' task
toggles an LED every three seconds.  If an error is discovered in any task the
rate is increased to 500 milliseconds.  [in this case the '*' characters on the 
LCD represent LED's]*/
#define mainNO_ERROR_CHECK_DELAY		( ( portTickType ) 3000 / portTICK_RATE_MS  )
#define mainERROR_CHECK_DELAY			( ( portTickType ) 500 / portTICK_RATE_MS  )

/* 
 * The function that implements the Check task.  See the comments at the head
 * of the page for implementation details.
 */ 
static void vErrorChecks( void *pvParameters );

/*
 * Called by the Check task.  Returns pdPASS if all the other tasks are found
 * to be operating without error - otherwise returns pdFAIL.
 */
static portSHORT prvCheckOtherTasksAreStillRunning( void );

/* 
 * Perform the hardware setup required by the ES449 in order to run the demo
 * application.
 */
static void prvSetupHardware( void );

void vParTestLcdRefresh(void);    // def'd in ParTest.c

/*-----------------------------------------------------------*/

/*
 * Start the demo application tasks - then start the real time scheduler.
 */
int main( void )
{
	/* Setup the hardware ready for the demo. */
	prvSetupHardware();
	vParTestInitialise();

	/* Start the standard demo application tasks. */
   /* NOTE: That the memory requirements of the LCD driver task mean that there is not
    * enough memory to support all four of these test tasks.  Any 3 of the following
    * should be compatable.
    */
	vStartLEDFlashTasks( mainLED_TASK_PRIORITY );
//	vStartIntegerMathTasks( tskIDLE_PRIORITY );
	vAltStartComTestTasks( mainCOM_TEST_PRIORITY, mainCOM_TEST_BAUD_RATE, mainCOM_TEST_LED );
	vStartPolledQueueTasks( mainQUEUE_POLL_PRIORITY );

	/* Start the 'Check' task which is defined in this file. */
	sTaskCreate( vErrorChecks, "Check", portMINIMAL_STACK_SIZE, NULL, mainCHECK_TASK_PRIORITY, NULL );	

	/* Start the scheduler. */
	vTaskStartScheduler( portUSE_PREEMPTION );

	/* As the scheduler has been started the demo applications tasks will be
	executing and we should never get here! */
	return 0;
}
/*-----------------------------------------------------------*/

static void vErrorChecks( void *pvParameters )
{
static volatile unsigned portLONG ulDummyVariable = 3UL;
portTickType xDelayPeriod = mainNO_ERROR_CHECK_DELAY;

	/* Cycle for ever, delaying then checking all the other tasks are still
	operating without error. */
	for( ;; )
	{
		/* Wait until it is time to check again.  The time we wait here depends
		on whether an error has been detected or not.  When an error is 
		detected the time is shortened resulting in a faster LED flash rate. */
		vTaskDelay( xDelayPeriod );

		/* Perform a bit of 32bit maths to ensure the registers used by the 
		integer tasks get some exercise outside of the integer tasks 
		themselves. The result here is not important we are just deliberately
		changing registers used by other tasks to ensure that their context
		switch is operating as required. - see the demo application 
		documentation for more info. */
		ulDummyVariable *= 3UL;
		
		/* See if the other tasks are all ok. */
		if( prvCheckOtherTasksAreStillRunning() != pdPASS )
		{
			/* An error occurred in one of the tasks so shorten the delay 
			period - which has the effect of increasing the frequency of the
			LED toggle. */
			xDelayPeriod = mainERROR_CHECK_DELAY;
		}

		/* Flash! */
		vParTestToggleLED( mainCHECK_LED );
	}
}
/*-----------------------------------------------------------*/

static portSHORT prvCheckOtherTasksAreStillRunning( void )
{
static portSHORT sNoErrorFound = pdTRUE;

	/* The demo tasks maintain a count that increments every cycle of the task
	provided that the task has never encountered an error.  This function 
	checks the counts maintained by the tasks to ensure they are still being
	incremented.  A count remaining at the same value between calls therefore
	indicates that an error has been detected.  Only tasks that do not flash
	an LED are checked. */

#if 0  
	if( sAreIntegerMathsTaskStillRunning() != pdTRUE )
	{
		sNoErrorFound = pdFALSE;
	}
#endif  

#if 1
	if( sAreComTestTasksStillRunning() != pdTRUE )
	{
		sNoErrorFound = pdFALSE;
	}
#endif  
	
#if 1  
	if( sArePollingQueuesStillRunning() != pdTRUE )
	{
		sNoErrorFound = pdFALSE;
	}
#endif  
	
	return sNoErrorFound;
}
/*-----------------------------------------------------------*/

static void InitOsc(void)
{
  WDTCTL = WDTPW | WDTHOLD;                      // stop watchdog timer

  BCSCTL1 |= XTS;                                // XT1 as high-frequency
  _BIC_SR(OSCOFF);                               // turn on XT1 oscillator
                          
  do                                             // wait in loop until crystal is stable 
    IFG1 &= ~OFIFG;
  while (IFG1 & OFIFG);

  BCSCTL1 |= DIVA0;                              // ACLK = XT1 / 2
  BCSCTL1 &= ~DIVA1;
  
  IE1 &= ~WDTIE;                                 // disable WDT int.
  IFG1 &= ~WDTIFG;                               // clear WDT int. flag
  
  WDTCTL = WDTPW | WDTTMSEL | WDTCNTCL | WDTSSEL | WDTIS1; // use WDT as timer, flag each
                                                           // 512 pulses from ACLK
                                                           
  while (!(IFG1 & WDTIFG));                      // count 1024 pulses from XT1 (until XT1's
                                                 // amplitude is OK)

  IE1 &= ~OFIE;                                  // disable osc. fault int.
  IFG1 &= ~OFIFG;                                // clear osc. fault int. flag
  BCSCTL2 |= SELM0 | SELM1;                      // set XT1 as MCLK
}  

static void InitPorts(void)
{
  P1SEL = 0;                                     // 
  P1OUT = 0;                                     //
  P1DIR = BIT5 | BIT6;                           //enable only Relay outputs

  P2SEL = 0;
  P2OUT = 0;
  P2DIR = ~BIT0;                                //only P2.0 is input
  
  P3SEL |= BIT4 | BIT5;                         //enable UART0    
  P3DIR |= BIT4;                                //enable TXD0 as output
  P3DIR &= ~BIT5;                               //enable RXD0 as input

  P4SEL = 0;
  P4OUT = 0;
  P4DIR = BIT2 | BIT3;                          //only buzzer pins are outputs

  P6SEL = 0x80;                                  
  P6OUT = 0;
  P6DIR = 0x00;                                  // all output
}

static void prvSetupHardware( void )
{
  InitOsc();
  InitPorts();
}
/*-----------------------------------------------------------*/