/**
* \brief AFEC(ADC) configuration.
*/
static void dsp_configure_adc(void)
{
pmc_enable_periph_clk(ID_AFEC0);
struct afec_config afec_cfg;
struct afec_ch_config afec_ch_cfg;
/* AFEC0 enable, init and configuration*/
afec_enable(AFEC0);
afec_get_config_defaults(&afec_cfg);
afec_init(AFEC0, &afec_cfg);
/* Set to Software trigger*/
afec_set_trigger(AFEC0, AFEC_TRIG_SW);
/* AFEC0 channals configuration*/
afec_channel_enable(AFEC0,ADC_CHANNEL_POTENTIOMETER);
afec_ch_get_config_defaults(&afec_ch_cfg);
afec_ch_set_config(AFEC0, ADC_CHANNEL_POTENTIOMETER,&afec_ch_cfg);
afec_ch_set_config(AFEC0, AFEC_TEMPERATURE_SENSOR, &afec_ch_cfg);
/*
* Because the internal ADC offset is 0x800, it should cancel it and
* shift down to 0.
*/
afec_channel_set_analog_offset(AFEC0, ADC_CHANNEL_POTENTIOMETER, 0x800);
afec_channel_set_analog_offset(AFEC0, AFEC_TEMPERATURE_SENSOR, 0x800);
afec_channel_enable(AFEC0,AFEC_TEMPERATURE_SENSOR);
afec_channel_enable(AFEC0,ADC_CHANNEL_MICROPHONE);
struct afec_temp_sensor_config afec_temp_sensor_cfg;
afec_temp_sensor_get_config_defaults(&afec_temp_sensor_cfg);
afec_temp_sensor_cfg.rctc = true;
afec_temp_sensor_set_config(AFEC0, &afec_temp_sensor_cfg);
/* Perform an auto cab on the ADC Channel 4. */
afec_start_calibration(AFEC0);
while((afec_get_interrupt_status(AFEC0) & AFEC_ISR_EOCAL) !=
AFEC_ISR_EOCAL);
/* Enable potentiometer channel, disable microphone. */
afec_channel_disable(AFEC0, ADC_CHANNEL_MICROPHONE);
afec_channel_enable(AFEC0, AFEC_TEMPERATURE_SENSOR);
afec_channel_enable(AFEC0, ADC_CHANNEL_MICROPHONE);
/* Start the first conversion*/
afec_start_software_conversion(AFEC0);
}
// Enable or disable a channel. Use AnalogCheckReady to make sure the ADC is ready before calling this.
void AnalogInEnableChannel(AnalogChannelNumber channel, bool enable)
{
if ((unsigned int)channel < numChannels)
{
if (enable)
{
activeChannels |= (1u << channel);
#if SAM3XA || SAM4S
adc_enable_channel(ADC, GetAdcChannel(channel));
#if SAM4S
adc_set_calibmode(ADC); // auto calibrate at start of next sequence
#endif
if (GetAdcChannel(channel) == ADC_TEMPERATURE_SENSOR)
{
adc_enable_ts(ADC);
}
#elif SAM4E || SAME70
afec_ch_config cfg;
afec_ch_get_config_defaults(&cfg);
afec_ch_set_config(GetAfec(channel), GetAfecChannel(channel), &cfg);
afec_channel_set_analog_offset(GetAfec(channel), GetAfecChannel(channel), 2048); // need this to get the full ADC range
afec_channel_enable(GetAfec(channel), GetAfecChannel(channel));
#if SAM4E
afec_start_calibration(GetAfec(channel)); // do automatic calibration
#endif
#endif
}
else
{
activeChannels &= ~(1u << channel);
#if SAM3XA || SAM4S
adc_disable_channel(ADC, GetAdcChannel(channel));
if (GetAdcChannel(channel) == ADC_TEMPERATURE_SENSOR)
{
adc_disable_ts(ADC);
}
#elif SAM4E || SAME70
afec_channel_disable(GetAfec(channel), GetAfecChannel(channel));
#endif
}
}
}
