timer_example1.c

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



Copyright (c) 2006, Atmel Corporation All rights reserved. 



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derived from this software without specific prior written permission.  



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OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 

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PARTICULAR PURPOSE ARE EXPRESSLY AND SPECIFICALLY 

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







#include "timer.h"



#define CPU_HZ 20000000



/* Useful pin behaviour definitions

    Used for compare trigger actions */



#define NOOP    0

#define SET     1

#define CLEAR   2

#define TOGGLE  3



/* Generic definitions */

#define TRUE    1

#define FALSE   0



/* PIO MASK */

#define LED_MASK 0x000000ff



void timer_delay( void );



int main( int argc, char * argv[] )

{



  struct timer_waveform_opt_t waveform_opt;

  volatile struct avr32_pio_t *piob = &AVR32_PIOC;

  volatile struct avr32_pio_t *pioc = &AVR32_PIOC; /* used for leds */



  /* The channel number and instance is used in several functions */

  /* It's defined as local variable for ease-of-use causes */

  int channel = 1;

  int timer_instance = 1;

  

  /* Enable Timer module on PIOB */

  piob->pdr = 0x0003ffff;

  piob->asr = 0x0003ffff;

  

  pioc->per = LED_MASK; /* pio enable */

  pioc->oer = LED_MASK; /* output enable */

  pioc->puer = LED_MASK; /* pull up enable */

  pioc->ower = LED_MASK; /* direct writing to output register */



  /* Options for Waveform genration */

  waveform_opt.channel = channel;

  waveform_opt.tcclks = TIMER_CLOCK_SOURCE_TC1;

  waveform_opt.clki = FALSE;

  waveform_opt.burst = FALSE;

  

  waveform_opt.cpcstop = FALSE;

  waveform_opt.cpcdis = FALSE;

  waveform_opt.eevtedg = FALSE;

  waveform_opt.eevt = 0;

  waveform_opt.enetrg = FALSE;

  waveform_opt.wavsel = TIMER_WAVEFORM_SEL_UPDOWN_MODE;

  

  waveform_opt.acpa = SET;

  waveform_opt.acpc = CLEAR;

  waveform_opt.aeevt = NOOP;

  waveform_opt.aswtrg = NOOP;

  

  waveform_opt.bcpb = NOOP;

  waveform_opt.bcpc = NOOP;

  waveform_opt.beevt = NOOP;

  waveform_opt.bswtrg = NOOP;

  

  /* Init the Timer */

  timer_init_waveform(timer_instance, &waveform_opt);

  timer_write_ra(timer_instance, channel, 0x0400 );

  timer_write_rb(timer_instance, channel, 0x0800 );

  timer_write_rc(timer_instance, channel, 0xffff );

  timer_start(timer_instance, channel);



  while(1){

    /* put the timer status out on the LEDS */

    pioc->odsr = timer_read_tc(timer_instance,channel) >> 8;

    timer_delay();

  }

}



void timer_delay( void )

{

  unsigned long i;

  

  for(i=0; i<CPU_HZ/40; i++);

}

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