/*

 * Copyright (C) 2003 Texas Instruments Incorporated

 * All Rights Reserved

 */

/*

 *---------main_timer1.c---------

 * This example uses a timer to generate interrupt at a specific period.

 * The timer event handler increments the event count and prints in stdout.

 */

#include <stdio.h>



#include <csl.h>

#include <csl_timer.h>

#include <csl_irq.h>



//---------Global constants---------



//Maximum count value

#define TIMER_CNT  20



//---------Global data definition---------

static TIMER_Handle hTimer1;

static Uint32 TimerEventId;

static int cnt = 0;



//Timer control register (CTL)

static Uint32 TimerControl = 

			

	TIMER_CTL_RMK

	(

		TIMER_CTL_SPND_EMUSTOP,

  		TIMER_CTL_INVINP_NO, 		// TINP inverter control(INVINP)

  		TIMER_CTL_CLKSRC_CPUOVR8,	// Timer input clock source (CLKSRC)

		TIMER_CTL_CP_PULSE, 		// Clock/pulse mode(CP)

		TIMER_CTL_HLD_YES, 			// Hold(HLD)

		TIMER_CTL_GO_NO, 			// Go bit(GO)-

									//   resets & starts timer counter

		TIMER_CTL_PWID_ONE, 		// Pulse width(PWID)-

									//   used only in pulse mode

		TIMER_CTL_DATOUT_0, 		// Data output (DATOUT)

		TIMER_CTL_INVOUT_NO, 		// TOUT inverter control (INVOUT) 

		TIMER_CTL_FUNC_GPIO 		// Function of TOUT pin(FUNC)

	);                 



//---------Function prototypes---------

void TimerEventHandler(void);

extern far void vectors();



//---------main routine---------

void main()

{

	TIMER_Config myTimConfig;

	

	//Initialise CSL

	CSL_init(); 

  

	//Open TIMER1 device, and reset it to power-on default state

	hTimer1 = TIMER_open(TIMER_DEV1, TIMER_OPEN_RESET);

  

	//Obtain the event ID for the timer device

	TimerEventId = TIMER_getEventId(hTimer1);

  

	//Point to the IRQ vector table  

	IRQ_setVecs(vectors);

	

	//Globally enable interrupts

	IRQ_globalEnable();

	

	//Enable NMI interrupt

	IRQ_nmiEnable();

  

	//Map TIMER events to physical interrupt number

	IRQ_map(TimerEventId, 14);

    

	//Reset the timer events

	IRQ_reset(TimerEventId);

    

	//---------Configure the timer devices---------

	

	//Start count value at zero

	myTimConfig.cnt = 0x0;

	

	//Use predefined control value  */

	myTimConfig.ctl = TimerControl;

	

	//Set period

	myTimConfig.prd = 0x00100000;

	

	TIMER_config(hTimer1, &myTimConfig);



	//Enable the timer events(events are disabled while resetting)

	IRQ_enable(TimerEventId);

  

	//Start the timers

	TIMER_start(hTimer1);



	//Waiting for interrupt

	while(cnt <= TIMER_CNT); 

}



//---------Subroutine definition---------



//Function called from TIMER1 ISR. Just increments the count by

//  one each time it enters this function. Exit from the program

//  after certain count value is reached.

void TimerEventHandler(void)

{

	//Process timer event here

	cnt++;  

  

	//Exit from the program when certain count is reached

	if (cnt > TIMER_CNT)

	{   

		TIMER_pause(hTimer1);

		TIMER_close(hTimer1);

		printf("\nTEST PASSED\n");

		exit(0);

	}

	printf("\n Count : %3d ",cnt);

}



//ISR to service TIMERINT1. 

//  vecs_timer1.asm must be modified to include c_int14 entry.

interrupt void c_int14(void)    

{

	TimerEventHandler();

	return;

}