1 | // The board.h header file defines which IO ports pheripherals like
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2 | // Switches and LEDs are connected to.
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3 | #include "../board.h"
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4 |
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5 | // Setup for different compilers
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6 | #include "../avr_compiler.h"
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7 |
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8 | // ADC Drivers
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9 | #include "../adc_driver.h"
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10 |
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11 | // Defines what you want to connect to the ADC.
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12 | // Light sensor (XMEGA-A1-Xplained)
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13 | #define ADC_INPUT ADC_CH_MUXPOS_PIN3_gc
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14 | //#define ADC_INPUT
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15 |
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16 | //NTC
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17 | //#define ADC_INPUT ADC_CH_MUXPOS_PIN0_gc
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18 |
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19 | volatile uint16_t ADC_result;
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20 |
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21 | int main( void )
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22 | {
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23 | // Variable for use when we read the result from an ADC channel
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24 | int8_t offset;
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25 |
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26 | LEDPORT.DIR = 0xFF; //Set as ouput, the 8 MSB of the result is output here
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27 | LEDPORT.OUT = 0xFF; //Default off for LED
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28 |
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29 | // ntc_enable(); //Pulls a pin low to enable the NTC.
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30 |
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31 | /* Move stored calibration values to ADC B */
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32 | ADC_CalibrationValues_Load(&ADCA);
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33 |
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34 |
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35 |
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36 | /* Set up ADC B to have signed conversion mode and 12 bit resolution. */
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37 | ADC_ConvMode_and_Resolution_Config(&ADCA, ADC_ConvMode_Signed, ADC_RESOLUTION_8BIT_gc);
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38 |
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39 | // The ADC has different voltage reference options, controlled by the REFSEL bits in the
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40 | // REFCTRL register. Here the internal reference is selected
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41 | ADC_Reference_Config(&ADCA,ADC_REFSEL_INT1V_gc);
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42 |
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43 | // The clock into the ADC decide the maximum sample rate and the conversion time, and
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44 | // this is controlled by the PRESCALER bits in the PRESCALER register. Here, the
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45 | // Peripheral Clock is divided by 8 ( gives 250 KSPS with 2Mhz clock )
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46 | ADC_Prescaler_Config(&ADCA, ADC_PRESCALER_DIV8_gc);
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47 |
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48 | // The used Virtual Channel (CH0) must be set in the correct mode
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49 | // In this task we will use single ended input, so this mode is selected
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50 |
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51 | /* Setup channel 0 to have single ended input. */
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52 | ADC_Ch_InputMode_and_Gain_Config(&ADCA.CH0,
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53 | ADC_CH_INPUTMODE_SINGLEENDED_gc,
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54 | ADC_CH_GAIN_1X_gc);
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55 |
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56 | //ADCA.CH0.MUXCTRL = ADC_CH_MUXINT_SCALEDVCC_gc;
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57 | // Setting up the which pins to convert.
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58 | // Note that the negative pin is internally connected to ground
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59 | ADC_Ch_InputMux_Config(&ADCA.CH0, ADC_INPUT, ADC_CH_MUXNEG_PIN0_gc);
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60 |
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61 | // Before the ADC can be used it must be enabled
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62 | ADC_Enable(&ADCA);
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63 |
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64 | // Wait until the ADC is ready
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65 | ADC_Wait_8MHz(&ADCA);
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66 |
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67 | // In the while(1) loop, a conversion is started on CH0 and the 8 MSB of the result is
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68 | // ouput on the LEDPORT when the conversion is done
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69 |
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70 | /* Get offset value for ADC B. */
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71 | offset = ADC_Offset_Get_Signed(&ADCA, &(ADCA.CH0), true);
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72 |
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73 | //Read the ADC forever...
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74 | while (1) {
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75 | // Start a single conversion
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76 | ADC_Ch_Conversion_Start(&ADCA.CH0);
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77 |
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78 | // Wait for the conversion to complete
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79 | while(!ADC_Ch_Conversion_Complete(&ADCA.CH0));
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80 |
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81 | // Get the result
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82 | ADC_result = ADC_ResultCh_GetWord_Signed(&ADCA.CH0, offset);
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83 |
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84 | // The result is a 12 bit value, 4 rightshifts maps MSB to LED7
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85 | // invert as the LED is on when pin is low
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86 | LEDPORT.OUT = ~(ADC_result >> 4);
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87 | }
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88 | }
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