task2_start.c

一个简单的小型操作系统

/***************************************************************
 *
 * Module       : _e7t_task2_start.c
 * Description  : This is an application that continuous runs
 *                until interrupted by a periodic interrupt
 * Platform     : e7t
 * History      :
 *		
 * 2000-03-26 Andrew N. Sloss
 * - implememtented on ARM Evaluator7T
 *
 * Notes        : none...
 *
 ***************************************************************/

/***************************************************************
 * IMPORT
 ***************************************************************/
#include "../core/mutex.h"

#include "../headers/api_types.h"
#include "../devices/ddf_io.h"
#include "../e7t/devices/ddf_types.h"

#include "../e7t/events/swis.h"
#include "../headers/api_device.h"

#define GREEN1      0
#define RED         2
#define ORANGE      1
#define GREEN2      3

/*****************************************************************************
 * ROTUINES
 *****************************************************************************/

device_treestr *orange_host;
UID oled;

/* -- openOrangeLED -----------------------------------------------------------
 *
 * Description   : opens the communication port to the red LED
 *
 * Parameters    : none..
 * Return        : BOOLean - successful | unsucessful 
 * Notes         :
 *
 */

BOOL openOrangeLED (void) 
{ 

/* --------------------------------------------------------------
 * eventIODeviceOpen - 
 * open the LED driver node...
 * --------------------------------------------------------------
 */

orange_host = eventIODeviceOpen(&oled,DEVICE_LED_E7T,ORANGE);

  /* check that a device driver is found ... */

  if (orange_host==0) {return FALSE;}

  /* check the UID .................. */

  switch (oled) 
  {
  case DEVICE_IN_USE:
  case DEVICE_UNKNOWN:

	return FALSE;
  } 
  	
return TRUE; 
}

/* -- switchOnOrangeLED -------------------------------------------------------
 *
 * Description  : switches on the Orange LED
 *
 * Parameter    : none...
 * Return       : none...
 * Notes	:
 *
 */

void switchOnOrangeLED (void)
{eventIODeviceWriteBit(orange_host,oled,(UINT)1);}

/* -- switchOffOrangeLED ------------------------------------------------------
 *
 * Description  : switches off the Orange LED
 *
 * Parameter    : none...
 * Return       : none...
 * Notes	:
 *
 */

void switchOffOrangeLED (void)
{eventIODeviceWriteBit(orange_host,oled,(UINT)0);}

/* -- C_EntryTask2 ------------------------------------------------------------
 *
 * Description : C entry point for task 2
 * 
 * Parameters  : none...
 * Return      : none...
 * Other       :
 *
 * This task executes continuously
 *
 */

void C_EntryTask2(void)
{
volatile int delay;

  if (openOrangeLED ()==TRUE)
  {
    while (1) 
    {
    bWAIT;
    switchOnOrangeLED ();

    /* dummy time delay...*/
    for (delay=0; delay<0x10ffff; delay++) {} 
  
    bSIGNAL;
    switchOffOrangeLED ();

    /* dummy time delay...*/
    for (delay=0; delay<0x10ffff; delay++) {}
    }
  }

  /* 
   * error loop
   */

  while (1) 
  {
  delay=0xBEEF0002;
  };
}