int platform_adc_start_sequence()
{
elua_adc_dev_state *d = adc_get_dev_state( 0 );
if( d->running != 1 )
{
adc_update_dev_sequence( 0 );
// Start sampling on first channel
d->seq_ctr = 0;
ADC_ChannelCmd( LPC_ADC, d->ch_state[ d->seq_ctr ]->id, ENABLE );
ADC_IntConfig( LPC_ADC, d->ch_state[ d->seq_ctr ]->id, ENABLE );
d->running = 1;
NVIC_EnableIRQ( ADC_IRQn );
if( d->clocked == 1 )
{
ADC_StartCmd( LPC_ADC, adc_trig[ d->timer_id ] );
TIM_ResetCounter( tmr[ d->timer_id ] );
TIM_Cmd( tmr[ d->timer_id ], ENABLE );
}
else
ADC_StartCmd( LPC_ADC, ADC_START_NOW );
}
return PLATFORM_OK;
}
// Handle ADC interrupts
// NOTE: This could probably be less complicated...
void ADC_IRQHandler(void)
{
elua_adc_dev_state *d = adc_get_dev_state( 0 );
elua_adc_ch_state *s = d->ch_state[ d->seq_ctr ];
//int i;
// Disable sampling & current sequence channel
ADC_StartCmd( LPC_ADC, 0 );
ADC_ChannelCmd( LPC_ADC, s->id, DISABLE );
ADC_IntConfig( LPC_ADC, s->id, DISABLE );
if ( ADC_ChannelGetStatus( LPC_ADC, s->id, ADC_DATA_DONE ) )
{
d->sample_buf[ d->seq_ctr ] = ( u16 )ADC_ChannelGetData( LPC_ADC, s->id );
s->value_fresh = 1;
if ( s->logsmoothlen > 0 && s->smooth_ready == 0)
adc_smooth_data( s->id );
#if defined( BUF_ENABLE_ADC )
else if ( s->reqsamples > 1 )
{
buf_write( BUF_ID_ADC, s->id, ( t_buf_data* )s->value_ptr );
s->value_fresh = 0;
}
#endif
if ( adc_samples_available( s->id ) >= s->reqsamples && s->freerunning == 0 )
platform_adc_stop( s->id );
}
// Set up for next channel acquisition if we're still running
if( d->running == 1 )
{
// Prep next channel in sequence, if applicable
if( d->seq_ctr < ( d->seq_len - 1 ) )
d->seq_ctr++;
else if( d->seq_ctr == ( d->seq_len - 1 ) )
{
adc_update_dev_sequence( 0 );
d->seq_ctr = 0; // reset sequence counter if on last sequence entry
}
ADC_ChannelCmd( LPC_ADC, d->ch_state[ d->seq_ctr ]->id, ENABLE );
ADC_IntConfig( LPC_ADC, d->ch_state[ d->seq_ctr ]->id, ENABLE );
if( d->clocked == 1 && d->seq_ctr == 0 ) // always use clock for first in clocked sequence
ADC_StartCmd( LPC_ADC, adc_trig[ d->timer_id ] );
// Start next conversion if unclocked or if clocked and sequence index > 0
if( ( d->clocked == 1 && d->seq_ctr > 0 ) || d->clocked == 0 )
ADC_StartCmd( LPC_ADC, ADC_START_NOW );
}
}
void __ISR(_ADC_VECTOR, ipl3) ADCInterruptHandler(void)
{
// Clear the ADC's interrupt flag.
IFS1CLR = ADC_INT_FLAG;
elua_adc_dev_state *d = adc_get_dev_state( 0 );
elua_adc_ch_state *s;
if ( AD1CON1bits.DONE )
{
d->seq_ctr = 0;
while( d->seq_ctr < d->seq_len )
{
s = d->ch_state[ d->seq_ctr ];
d->sample_buf[ d->seq_ctr ] = ( u16 )ReadADC10(0);
s->value_fresh = 1;
// Fill in smoothing buffer until warmed up
if ( s->logsmoothlen > 0 && s->smooth_ready == 0)
adc_smooth_data( s->id );
#if defined( BUF_ENABLE_ADC )
else if ( s->reqsamples > 1 )
{
buf_write( BUF_ID_ADC, s->id, ( t_buf_data* )s->value_ptr );
s->value_fresh = 0;
}
#endif
// If we have the number of requested samples, stop sampling
if ( adc_samples_available( s->id ) >= s->reqsamples && s->freerunning == 0 )
platform_adc_stop( s->id );
d->seq_ctr++;
}
d->seq_ctr = 0;
}
if( d->running == 1 )
adc_update_dev_sequence( 0 );
if ( d->clocked == 0 && d->running == 1 )
{
// start conversion
AD1CON1SET = _AD1CON1_ASAM_MASK;
AD1CON1SET = _AD1CON1_SAMP_MASK;
}
if(!d->running)
{
CloseADC10();
}
}
int platform_adc_start_sequence()
{
elua_adc_dev_state *d = adc_get_dev_state( 0 );
// Only force update and initiate if we weren't already running
// changes will get picked up during next interrupt cycle
if ( d->running != 1 )
{
// Bail if we somehow were trying to set up clocked conversion
if( d->clocked == 1 )
return PLATFORM_ERR;
d->running = 1;
adc_update_dev_sequence( 0 );
}
return PLATFORM_OK;
}
