uint16_t readADC(){
uint16_t ADC_result = 0;
int8_t offset;
/* Move stored calibration values to ADC B */
ADC_CalibrationValues_Load(&ADCA);
/* Set up ADC B to have signed conversion mode and 12 bit resolution. */
ADC_ConvMode_and_Resolution_Config(&ADCA, true, ADC_RESOLUTION_12BIT_gc);
// The ADC has different voltage reference options, controlled by the REFSEL bits in the
// REFCTRL register. Here the internal reference is selected
ADC_Reference_Config(&ADCA, ADC_REFSEL_VCC_gc);
// The clock into the ADC decide the maximum sample rate and the conversion time, and
// this is controlled by the PRESCALER bits in the PRESCALER register. Here, the
// Peripheral Clock is divided by 8 ( gives 250 KSPS with 2Mhz clock )
ADC_Prescaler_Config(&ADCA, ADC_PRESCALER_DIV8_gc);
// The used Virtual Channel (CH0) must be set in the correct mode
// In this task we will use single ended input, so this mode is selected
/* Setup channel 0 to have single ended input. */
ADC_Ch_InputMode_and_Gain_Config(&ADCA.CH0,
ADC_CH_INPUTMODE_DIFF_gc,
ADC_CH_GAIN_1X_gc);
// Setting up the which pins to convert.
// Note that the negative pin is internally connected to ground
ADC_Ch_InputMux_Config(&ADCA.CH0, ADC_CH_MUXPOS_PIN0_gc, ADC_CH_MUXNEG_PIN1_gc);
// Before the ADC can be used it must be enabled
ADC_Enable(&ADCA);
// Wait until the ADC is ready
ADC_Wait_32MHz(&ADCA);
// In the while(1) loop, a conversion is started on CH0 and the 8 MSB of the result is
// ouput on the LEDPORT when the conversion is done
/* Get offset value for ADC B. */
offset = ADC_Offset_Get_Unsigned(&ADCA, &(ADCA.CH0), true);
for(int i = 0; i<5; i++){
ADC_Ch_Conversion_Start(&ADCA.CH0);
while(!ADC_Ch_Conversion_Complete(&ADCA.CH0));
//ADCB.INTFLAGS = ADC_CH0IF_bm; // Clear CH0IF by writing a one to it
ADC_result += ADCA.CH0RES;// - offset;
}
return ADC_result/5;
}
uint16_t get_chip_temperature(void)
{
uint16_t adc_result = 0;
int8_t offset = 0;
offset = ADC_Offset_Get_Unsigned(&ADCB, &(ADCB.CH0), true);
ADC_Ch_Conversion_Start(&ADCB.CH0);
while(!ADC_Ch_Conversion_Complete(&ADCB.CH0));
adc_result = ADC_ResultCh_GetWord_Unsigned(&ADCB.CH0, offset);
return adc_result;
}
uint16_t get_scaled_vcc(void)
{
uint16_t adc_result = 0;
int8_t offset = 0;
offset = ADC_Offset_Get_Unsigned(&ADCB, &(ADCB.CH1), true);
ADC_Wait_8MHz(&ADCB);
ADC_Ch_Conversion_Start(&ADCB.CH1);
while(!ADC_Ch_Conversion_Complete(&ADCB.CH1));
adc_result = ADC_ResultCh_GetWord_Unsigned(&ADCB.CH1, offset);
return adc_result;
}
uint16_t get_ambient_light(void)
{
uint16_t adc_result = 0;
int8_t offset = 0;
offset = ADC_Offset_Get_Unsigned(&ADCA, &(ADCA.CH0), true);
// enable ambient light sensor
AMBIENT_PORT.DIRSET = AMBIENT_ENABLE_bm;
AMBIENT_PORT.OUTSET = AMBIENT_ENABLE_bm;
_delay_us(100);
ADC_Ch_Conversion_Start(&ADCA.CH0);
while(!ADC_Ch_Conversion_Complete(&ADCA.CH0));
adc_result = ADC_ResultCh_GetWord_Unsigned(&ADCA.CH0, offset);
// disable ambient light sensor (to save battery)
AMBIENT_PORT.OUTCLR = AMBIENT_ENABLE_bm;
return adc_result;
}
