task1_start.c

一个简单的小型操作系统

/*****************************************************************************
 *
 * Module       : task1_start.c
 * Description  : Shell TASK routine that toggles the LED2
 * Platform     : e7t
 * History      :
 *
 * 2000-03-27 Andrew N. Sloss
 * - implemented on Evalautor7T
 * - added header and changed the delay time
 *
 *****************************************************************************/

/*****************************************************************************
 * 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

/*****************************************************************************
 * STATICS
 *****************************************************************************/

device_treestr *red_host;
UID rled;

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

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

BOOL openRedLED(void) 
{ 
unsigned int delay;
/* --------------------------------------------------------------
 *
 * eventIODeviceOpen - 
 *
 * open the LED driver node...
 * 
 * --------------------------------------------------------------
 */

red_host = eventIODeviceOpen(&rled,DEVICE_LED_E7T,RED);

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

  /*
  if (red_host==0) {
    while (1) 
    {
    delay=0xBEEF0401;
    };
  return FALSE;
  }
  */

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

  switch (rled) 
  {
  case DEVICE_IN_USE:
  case DEVICE_UNKNOWN:
  
    /* while (1) 
    {
    delay=0xBEEF0201;
    }; */

	return FALSE;
  } 
  	
return TRUE; 
}

/* -- switchOnRedLED ----------------------------------------------------------
 *
 * Description  : switches on the RED LED
 *
 * Parameter    : none...
 * Return       : none...
 * Notes	:
 *
 */

void switchOnRedLED(void)
{eventIODeviceWriteBit(red_host,rled,(UINT)1);}

/* -- switchOffRedLED ---------------------------------------------------------
 *
 * Description  : switches off the RED LED
 *
 * Parameter    : none...
 * Return       : none...
 * Notes	:
 *
 */

void switchOffRedLED(void)
{eventIODeviceWriteBit(red_host,rled,(UINT)0);}

/* -- C_EntryTask1 ------------------------------------------------------------
 *
 * Description  : C entry to Task1
 *
 * Parameter    : none...
 * Return       : none...
 * Notes	:
 *
 * Never terminates
 */

void C_EntryTask1(void)
{
volatile int delay;

  if (openRedLED ()==TRUE)
  {
    switchOnRedLED ();
    while (1) 
    {
    aWAIT;
    switchOnRedLED ();

    /* dummy time delay... */
    for (delay=0; delay<0x20ffff; delay++) {} 
  
    aSIGNAL;
    switchOffRedLED ();
    
    /* dummy time delay... */
    for (delay=0; delay<0x20ffff; delay++) {}
    }
  }

  /* 
   * error loop
   */

  while (1) 
  {
  delay=0xBEEF0001;
  };
}