mikrokontrollersystemer-prosjekt/prosjekt.X/voltage.c

#include "voltage.h"
#include "uart.h"

void ADC0_init(void) {
  /* Initializing ADC0 pin*/
  /*Voltage reading on pin pd2*/
  PORTD.PIN2CTRL &= ~PORT_ISC_gm;
  PORTD.PIN2CTRL |= PORT_ISC_INPUT_DISABLE_gc; /* Disable  */
  PORTD.PIN2CTRL &= PORT_PULLUPEN_bm;

  /* Thermistor */
  PORTD.PIN3CTRL &= ~PORT_ISC_gm;
  PORTD.PIN3CTRL |= PORT_ISC_INPUT_DISABLE_gc; /* Disable  */
  PORTD.PIN3CTRL &= PORT_PULLUPEN_bm;

  ADC0.CTRLC = ADC_PRESC_DIV4_gc;
  VREF.ADC0REF = VREF_REFSEL_VDD_gc;  /* Internal reference */
  ADC0.CTRLA = ADC_ENABLE_bm          /* ADC Enable: enabled */
               | ADC_RESSEL_10BIT_gc; /* 10-bit mode */

  /* Select ADC channel */
  ADC0.MUXPOS = ADC_MUXPOS_AIN6_gc;
}

uint16_t ADC0_read(void) {
  /* Start ADC conversion */
  ADC0.COMMAND = ADC_STCONV_bm;
  /* Wait until ADC conversion done */
  while (!(ADC0.INTFLAGS & ADC_RESRDY_bm)) {
    ;
  }
  // Clear the interrupt flag by writing 1:
  ADC0.INTFLAGS = ADC_RESRDY_bm;
  return ADC0.RES;
}

uint16_t thermistor_voltage_read() {
  /* Gets value for the diode */
  ADC0.MUXPOS = 0x03; // Read PD3
  uint16_t adc_val = ADC0_read();

  return adc_val;
}
// Gets the value over thermistor
uint16_t external_voltage_read() {
  ADC0.MUXPOS = 0x02; // Read PD6
  uint16_t adc_val = ADC0_read();

  return adc_val;
}

uint16_t internal_voltage_read() {
  /* Gets value for the internal voltage reffreance*/

  ADC0.MUXPOS = 0x44;
  uint8_t adc_val = ADC0_read();

  return adc_val * 10;
}