/**
* \brief Application entry point.
*
* \return Unused (ANSI-C compatibility).
*/
int main(void)
{
int32_t ul_vol;
int32_t ul_temp;
/* Initialize the SAM system. */
sysclk_init();
board_init();
configure_console();
/* Output example information. */
puts(STRING_HEADER);
afec_enable(AFEC0);
struct afec_config afec_cfg;
afec_get_config_defaults(&afec_cfg);
afec_init(AFEC0, &afec_cfg);
afec_set_trigger(AFEC0, AFEC_TRIG_SW);
struct afec_ch_config afec_ch_cfg;
afec_ch_get_config_defaults(&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, AFEC_TEMPERATURE_SENSOR, 0x800);
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);
afec_set_callback(AFEC0, AFEC_INTERRUPT_EOC_15,
afec_temp_sensor_end_conversion, 1);
while (1) {
if(is_conversion_done == true) {
ul_vol = g_ul_value * VOLT_REF / MAX_DIGITAL;
/*
* According to datasheet, The output voltage VT = 1.44V at 27C
* and the temperature slope dVT/dT = 4.7 mV/C
*/
ul_temp = (ul_vol - 1440) * 100 / 470 + 27;
printf("Temperature is: %4d\r", (int)ul_temp);
is_conversion_done = false;
}
}
}
/**
* \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);
}
/*
* Inialise the temp sensor
*
*/
void temp_init(void)
{
afec_enable(AFEC0);
struct afec_config afec_cfg;
afec_get_config_defaults(&afec_cfg);
afec_init(AFEC0, &afec_cfg);
afec_set_trigger(AFEC0, AFEC_TRIG_SW);
struct afec_ch_config afec_ch_cfg;
afec_ch_get_config_defaults(&afec_ch_cfg);
afec_ch_set_config(AFEC0, AFEC_TEMPERATURE_SENSOR, &afec_ch_cfg);
afec_channel_set_analog_offset(AFEC0, AFEC_TEMPERATURE_SENSOR, 0x800);
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);
afec_set_callback(AFEC0, AFEC_INTERRUPT_EOC_15, afec_temp_sensor_end_conversion, 1);
}
