comtest.c

基于FREERtos和LPC2468的程序。里面实现了串口通信

/*
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*/


/*
 * This version of comtest. 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.
 *
 * Creates two tasks that operate on an interrupt driven serial port.  A
 * loopback connector should be used so that everything that is transmitted is
 * also received.  The serial port does not use any flow control.  On a
 * standard 9way 'D' connector pins two and three should be connected together.
 *
 * The first task posts a sequence of characters to the Tx queue, toggling an
 * LED on each successful post.  At the end of the sequence it sleeps for a
 * pseudo-random period before resending the same sequence.
 *
 * The UART Tx end interrupt is enabled whenever data is available in the Tx
 * queue.  The Tx end ISR removes a single character from the Tx queue and
 * passes it to the UART for transmission.
 *
 * The second task blocks on the Rx queue waiting for a character to become
 * available.  When the UART Rx end interrupt receives a character it places
 * it in the Rx queue, waking the second task.  The second task checks that the
 * characters removed from the Rx queue form the same sequence as those posted
 * to the Tx queue, and toggles an LED for each correct character.
 *
 * The receiving task is spawned with a higher priority than the transmitting
 * task.  The receiver will therefore wake every time a character is
 * transmitted so neither the Tx or Rx queue should ever hold more than a few
 * characters.
 *
 */

/*
Changes from V1.2.0:

	+ Reduced the maximum time between successive transmissions.  This provides
	  for a more rigorous test.

Changes from V2.0.0

	+ Delay periods are now specified using variables and constants of
	  portTickType rather than unsigned portLONG.

Changes from V2.5.1

	+ The constant comOFFSET_TIME added to the delay period to ensure a more
	  random delay period is used.
*/

/* Scheduler include files. */
//#include <stdlib.h>
#include "FreeRTOS.h"
#include "task.h"

/* Demo program include files. */
#include "serial.h"
#include "comtest.h"
#include "partest.h"


#define comTOTAL_PERMISSIBLE_ERRORS ( 2 )

/* The Tx task will transmit the sequence of characters at a pseudo random
interval.  This is the maximum and minimum block time between sends. */
#define comTX_MAX_BLOCK_TIME		( ( portTickType ) 0x96 )
#define comTX_MIN_BLOCK_TIME		( ( portTickType ) 0x32 )
#define comOFFSET_TIME				( ( portTickType ) 3 )

/* We should find that each character can be queued for Tx immediately and we
don't have to block to send. */
#define comNO_BLOCK					( ( portTickType ) 0 )

/* The Rx task will block on the Rx queue for a long period. */
#define comRX_BLOCK_TIME			( ( portTickType ) 0xffff )


#define comBUFFER_LEN				150
#define comINITIAL_RX_COUNT_VALUE	( 0 )




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

void vAltStartComTestTasks( unsigned portBASE_TYPE uxPriority, unsigned portLONG ulBaudRate, unsigned portBASE_TYPE uxLED )
{
	
	xSerialPortInitMinimal( ulBaudRate, comBUFFER_LEN );

	
}
/*-----------------------------------------------------------*/