timer.c

AT91所有开发板的资料 AT91所有开发板的资料

/*******************************************************************************
 * 
 * ARM Strategic Support Group
 *
 *******************************************************************************/

/*******************************************************************************
 *
 * Module       : timer.c
 * Description  : Setup for Samsung KS32C50100 IRQ registers and serives the 
 *				  IRQ's (timer)
 * Tool Chain	: ARM Developer Suite v1.0
 * Platform     : Evaluator7T
 * History      : 
 *
 *		980416 ASloss
 *		- added button interrupt service
 *      - added header information
 *
 *		2000-04-04 Andrew N. Sloss
 *		- ported to the Evaluator7T
 *
 * Notes        : Refer to the Samsung KS32C50100 User Manual 
 *
 *******************************************************************************/

/*******************************************************************************
 * IMPORT
 *******************************************************************************/

#include "led.h"
#include "button.h"
#include "macros.h"
#include "traffic.h"
#include "segment.h"

/*******************************************************************************
 * MACRO'S
 *******************************************************************************/

#define COUNTDOWN	0x02effff0;

/*****************************************************************************
 * EXTERN's
 *****************************************************************************/

// none...

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

// none...

/*****************************************************************************
 * ROUTINES
 *****************************************************************************/

/* -- timer_init ----------------------------------------------------------
 *                                                            
 * Description  : Initialises the counter timer and sets the timer divisor.      
 *
 * Parameters   : none...   
 * Return       : none...
 * Notes        : none...
 *                                                                             
 */

void timer_init (void)
{
  *TMOD		= 0;
  *INTPND 	= 0x00000000; 	// Clear pending interrupts .............
}

/* -- timer_irq ------------------------------------------------------------
 *
 * Description  : handles the aux timer interrupt.
 *
 * Parameters   : none...
 * Return       : none...
 * Notes        : Other interrupt sources are handled by angel. See 
 *		  		  irq_ven.s
 *
 *
 */ 

void  timer_irq (void) 
{ 

	// *TMOD	= 0; 
	*INTPND	= 1 << 10;
	*TDATA0	= COUNTDOWN; // reset interrupt

   // -- toggle the LED D4 to show timer interrupt...
   
   traffic_sequence ();

	// -- re-enable interrupts ...

	// *TMOD	= 1;
	 *(volatile int*)INTMSK &= ~((1 << INT_GLOBAL) | (1 <<10) | (1<<0));
	 
} 



/* -- timer_start -----------------------------------------------------------
 *
 * Description  : switches the timer on
 *
 * Parameters   : none...
 * Return       : none...
 * Notes        : none...
 *
 */  

void timer_start (void)
{	
  *TDATA0		 = COUNTDOWN;	// reload CT .......................
  *TMOD 		|= 0x1;			// enable interval interrupt ...................
  
  *(volatile int*)INTMSK &= ~((1 << INT_GLOBAL) | (1 <<10) | (1<<0));
  
  /* Set counter gate to true ............................................. */ 
}

/*******************************************************************************
 * END OF timer.c
 *******************************************************************************/