timer.c

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

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

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the 
following disclaimer. 

2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.

3. The name of ATMEL may not be used to endorse or promote products 
derived from this software without specific prior written permission.  

THIS SOFTWARE IS PROVIDED BY ATMEL ``AS IS'' AND ANY EXPRESS 
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 
PARTICULAR PURPOSE ARE EXPRESSLY AND SPECIFICALLY 
DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY 
WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 

POSSIBILITY OF SUCH DAMAGE. 

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

#include "timer.h"



int timer_init_capture( unsigned int instance, volatile struct timer_capture_opt_t *opt )
{
        volatile struct avr32_timer_t *timer =timer_getHandle(instance);

        if( (opt->channel >= TIMER_NUMBER_OF_CHANNELS) )
                return TIMER_INVALID_ARGUMENT;

        /* MEASURE SIGNALS: Capture operating mode */
        timer->channel[opt->channel].cmr =
                (opt->tcclks << AVR32_TIMER_TCCLKS_OFFSET) |
                (opt->clki << AVR32_TIMER_CLKI_OFFSET ) |
                (opt->burst << AVR32_TIMER_BURST_OFFSET ) |
                (opt->ldbstop << AVR32_TIMER_LDBSTOP_OFFSET ) |
                (opt->ldbdis << AVR32_TIMER_LDBDIS_OFFSET ) |
                (opt->etrgedg << AVR32_TIMER_ETRGEDG_OFFSET )|
                (opt->abetrg << AVR32_TIMER_ABETRG_OFFSET ) |
                (opt->cpctrg << AVR32_TIMER_CPCTRG_OFFSET )|
                (TIMER_CAPTURE_OPERATING_MODE << AVR32_TIMER_WAVE_OFFSET ) |
                (opt->ldra << AVR32_TIMER_LDRA_OFFSET ) |
                (opt->ldrb << AVR32_TIMER_LDRB_OFFSET );

        return TIMER_SUCCESS;
} /* end timer_init_capture() */


int timer_init_waveform( unsigned int instance, volatile struct timer_waveform_opt_t *opt )
{
        volatile struct avr32_timer_t *timer = timer_getHandle(instance);

        if( (opt->channel >=TIMER_NUMBER_OF_CHANNELS) | (opt->channel < TIMER_SUCCESS) )
                return TIMER_INVALID_ARGUMENT;

        /* GENERATE SIGNALS: Waveform operating mode */
        timer->channel[opt->channel].cmr =
                (opt->tcclks << AVR32_TIMER_TCCLKS_OFFSET) |
                (opt->clki << AVR32_TIMER_CLKI_OFFSET ) |
                (opt->burst << AVR32_TIMER_BURST_OFFSET ) |
                (opt->cpcstop << AVR32_TIMER_CPCSTOP_OFFSET ) |
                (opt->cpcdis << AVR32_TIMER_CPCDIS_OFFSET ) |
                (opt->eevtedg << AVR32_TIMER_EEVTEDG_OFFSET )|
                (opt->eevt << AVR32_TIMER_EEVT_OFFSET )|
                (opt->enetrg << AVR32_TIMER_ENETRG_OFFSET )|
                (opt->wavsel << AVR32_TIMER_WAVSEL )|
                (TIMER_WAVEFORM_OPERATING_MODE << AVR32_TIMER_WAVE_OFFSET )|
                (opt->acpa << AVR32_TIMER_ACPA_OFFSET )|
                (opt->acpc << AVR32_TIMER_ACPC_OFFSET )|
                (opt->aeevt << AVR32_TIMER_AEEVT_OFFSET )|
                (opt->aswtrg << AVR32_TIMER_ASWTRG_OFFSET )|
                (opt->bcpb << AVR32_TIMER_BCPB_OFFSET )|
                (opt->bcpc << AVR32_TIMER_BCPC_OFFSET )|
                (opt->beevt << AVR32_TIMER_BEEVT_OFFSET )|
                (opt->bswtrg << AVR32_TIMER_BSWTRG_OFFSET );

        return TIMER_SUCCESS;
} /* end timer_init_waveform() */


int timer_start( unsigned int instance, unsigned int channel )
{
        volatile struct avr32_timer_t *timer = timer_getHandle(instance);

        if( (channel >= AVR32_TIMER_COUNT) | (channel < 0) )
                return TIMER_INVALID_ARGUMENT;

        /* Disable the current timer */
        timer->channel[channel].ccr = (1<<AVR32_TIMER_CLKEN_OFFSET) | (1<<AVR32_TIMER_SWTRG_OFFSET);
        return TIMER_SUCCESS;
}


int timer_stop( unsigned int instance, unsigned int channel )
{
        volatile struct avr32_timer_t *timer =timer_getHandle(instance);

        if( (channel >= AVR32_TIMER_COUNT) | (channel < 0) )
                return TIMER_INVALID_ARGUMENT;

        /* Disable the current timer */
        timer->channel[channel].ccr = (1<<AVR32_TIMER_CLKDIS_OFFSET);

        return TIMER_SUCCESS;
}


int timer_software_trigger( unsigned int instance, unsigned int channel)
{
        volatile struct avr32_timer_t *timer = timer_getHandle(instance);

        if( (channel >= AVR32_TIMER_COUNT) | (channel < 0) )
                return TIMER_INVALID_ARGUMENT;

        /* Disable the current timer */
        timer->channel[channel].ccr = (1<<AVR32_TIMER_SWTRG_OFFSET);
        return TIMER_SUCCESS;
}


void timer_sync_trigger( unsigned int instance )
{
        volatile struct avr32_timer_t *timer =timer_getHandle(instance);

        timer->bcr = (1<<AVR32_TIMER_BCR_SYNC_OFFSET);
}


int timer_external_clock_selection( unsigned int instance, unsigned int channel, unsigned int clock_signal )
{
        volatile struct avr32_timer_t *timer =timer_getHandle(instance);

        /* Check for valid input */
        if( (channel >= TIMER_NUMBER_OF_CHANNELS) | (instance >= AVR32_TIMER_COUNT) | (clock_signal >= 2) )
                return TIMER_INVALID_ARGUMENT;

        //clear bitfield and set the correct behaviour
        timer->bmr &= ~( (AVR32_TIMER_BMR_TC2XC2S_SIZE+1) << (2*clock_signal) );
        timer->bmr = channel << (2*clock_signal) ;

        return TIMER_SUCCESS;
}


int timer_read_ra( unsigned int instance, unsigned int channel )
{
        volatile struct avr32_timer_t *timer = timer_getHandle(instance);

        if (channel>=AVR32_TIMER_COUNT)
                return TIMER_INVALID_ARGUMENT;

        return (timer->channel[channel].ra);
}


int timer_read_rb( unsigned int instance, unsigned int channel )
{
        volatile struct avr32_timer_t *timer = timer_getHandle(instance);

        if (channel>=AVR32_TIMER_COUNT)
                return TIMER_INVALID_ARGUMENT;

        return (timer->channel[channel].rb);
}


int timer_read_rc( unsigned int instance, unsigned int channel )
{
        volatile struct avr32_timer_t *timer = timer_getHandle(instance);

        if (channel>=AVR32_TIMER_COUNT)
                return TIMER_INVALID_ARGUMENT;

        return (timer->channel[channel].rc);
}


int timer_read_tc( unsigned int instance, unsigned int channel )
{
        volatile struct avr32_timer_t *timer = timer_getHandle(instance);

        if (channel>=AVR32_TIMER_COUNT)
                return TIMER_INVALID_ARGUMENT;

        return (timer->channel[channel].cv);
}


int timer_write_ra( unsigned int instance, unsigned int channel, unsigned short value )
{
        volatile struct avr32_timer_t *timer = timer_getHandle(instance);

        if( (channel>=AVR32_TIMER_COUNT) | (channel>=TIMER_NUMBER_OF_CHANNELS) )
                return TIMER_INVALID_ARGUMENT;

        /* This function is only available in WAVEFORM mode */
        if(timer->channel[channel].cmr & AVR32_TIMER_CMR0_WAVE_MASK)
                timer->channel[channel].ra = value;

        return TIMER_SUCCESS;
}


int timer_write_rb( unsigned int instance, unsigned int channel, unsigned short value )
{
        volatile struct avr32_timer_t *timer = timer_getHandle(instance);

        if( (channel>=AVR32_TIMER_COUNT) | ( channel >= TIMER_NUMBER_OF_CHANNELS ) )
                return TIMER_INVALID_ARGUMENT;

        /* This function is only available in WAVEFORM mode */
        if(timer->channel[channel].cmr & AVR32_TIMER_CMR0_WAVE_MASK)
                timer->channel[channel].rb = value;

        return TIMER_SUCCESS;
}


int timer_write_rc( unsigned int instance, unsigned int channel, unsigned short value )
{
        volatile struct avr32_timer_t *timer = timer_getHandle(instance);

        if( (channel >= AVR32_TIMER_COUNT) | (channel >= TIMER_NUMBER_OF_CHANNELS) )
                return TIMER_INVALID_ARGUMENT;

        /* This function is only available in WAVEFORM mode */
        if(timer->channel[channel].cmr & AVR32_TIMER_CMR0_WAVE_MASK)
                timer->channel[channel].rc = value;

        return TIMER_SUCCESS;
}


unsigned long timer_read_sr( unsigned int instance, unsigned int channel )
{
        volatile struct avr32_timer_t *timer = timer_getHandle(instance);

        return timer->channel[channel].sr;

}


volatile avr32_timer_t * timer_getHandle( unsigned int instance )
{
  switch (instance) {

  case 0:
    return &AVR32_TIMER0;

  case 1:
    return &AVR32_TIMER1;

  default:
    break;
    
  }
  return (avr32_timer_t *) TIMER_INVALID_ARGUMENT;

}


int timer_configure_interrupts(unsigned int instance, unsigned int channel, volatile struct timer_interrupt_t *bitfield)
{
        volatile struct avr32_timer_t *timer = timer_getHandle(instance);

        if( instance >= AVR32_TIMER_COUNT )
                return TIMER_INVALID_ARGUMENT;

        /* enable the appropriate interrupts */
        timer->channel[channel].ier = (bitfield->covfs << AVR32_TIMER_COVFS_OFFSET) |
                                                                (bitfield->lovrs << AVR32_TIMER_LOVRS_OFFSET) |
                                                                (bitfield->cpas << AVR32_TIMER_CPAS_OFFSET) |
                                                                (bitfield->cpbs << AVR32_TIMER_CPBS_OFFSET) |
                                                                (bitfield->cpcs << AVR32_TIMER_CPCS_OFFSET) |
                                                                (bitfield->ldras << AVR32_TIMER_LDRAS_OFFSET) |
                                                                (bitfield->ldrbs << AVR32_TIMER_LDRBS_OFFSET) |
                                                                (bitfield->etrgs << AVR32_TIMER_ETRGS_OFFSET);

        /* disable the appropriate interrupts */
        timer->channel[channel].idr = ( ~(bitfield->covfs) << AVR32_TIMER_COVFS_OFFSET) |
                                                                ( ~(bitfield->lovrs) << AVR32_TIMER_LOVRS_OFFSET) |
                                                                ( ~(bitfield->cpas) << AVR32_TIMER_CPAS_OFFSET) |
                                                                ( ~(bitfield->cpbs) << AVR32_TIMER_CPBS_OFFSET) |
                                                                ( ~(bitfield->cpcs) << AVR32_TIMER_CPCS_OFFSET) |
                                                                ( ~(bitfield->ldras) << AVR32_TIMER_LDRAS_OFFSET) |
                                                                ( ~(bitfield->ldrbs) << AVR32_TIMER_LDRBS_OFFSET) |
                                                                ( ~(bitfield->etrgs) << AVR32_TIMER_ETRGS_OFFSET);

        return TIMER_SUCCESS;
}


char timer_interrupt_settings(unsigned int instance, unsigned int channel)
{
        volatile struct avr32_timer_t *timer = timer_getHandle(instance);

        if( (instance >= AVR32_TIMER_COUNT) | (channel >= TIMER_NUMBER_OF_CHANNELS) )
                return TIMER_INVALID_ARGUMENT;

        return timer->channel[channel].imr;

}

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