68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
#include "voltage.h"
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#include "uart.h"
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void ADC0_init(void) {
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/* Initializing ADC0 pin*/
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/*Voltage reading on pin pd6*/
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PORTD.PIN6CTRL &= ~PORT_ISC_gm;
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PORTD.PIN6CTRL |= PORT_ISC_INPUT_DISABLE_gc; /* Disable */
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PORTD.PIN6CTRL &= PORT_PULLUPEN_bm;
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/* Thermistor */
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PORTD.PIN3CTRL &= ~PORT_ISC_gm;
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PORTD.PIN3CTRL |= PORT_ISC_INPUT_DISABLE_gc; /* Disable */
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PORTD.PIN3CTRL &= PORT_PULLUPEN_bm;
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ADC0.CTRLC = ADC_PRESC_DIV4_gc;
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VREF.ADC0REF = VREF_REFSEL_VDD_gc; /* Internal reference */
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ADC0.CTRLA = ADC_ENABLE_bm /* ADC Enable: enabled */
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| ADC_RESSEL_10BIT_gc; /* 10-bit mode */
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/* Select ADC channel */
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ADC0.MUXPOS = ADC_MUXPOS_AIN6_gc;
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}
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uint16_t ADC0_read(void) {
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/* Start ADC conversion */
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ADC0.COMMAND = ADC_STCONV_bm;
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/* Wait until ADC conversion done */
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while (!(ADC0.INTFLAGS & ADC_RESRDY_bm)) {
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;
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}
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// Clear the interrupt flag by writing 1:
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ADC0.INTFLAGS = ADC_RESRDY_bm;
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return ADC0.RES;
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}
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uint16_t thermistor_voltage_read() {
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/* Gets value for the diode */
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ADC0.MUXPOS = 0x03;
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uint16_t adc_val = ADC0_read();
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return adc_val;
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}
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uint16_t external_voltage_read(){
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ADC0.MUXPOS = 0x02;
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uint16_t adc_val = ADC0_read();
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return adc_val;
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}
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uint16_t internal_voltage_read() {
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/* Gets value for the internal voltage reffreance*/
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ADC0.MUXPOS = 0x44;
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uint8_t adc_val = ADC0_read();
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return adc_val*10;
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}
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uint16_t convert_to_voltage(uint16_t adc_val){
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uint16_t min_in= 0;
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uint16_t min_out= 0;
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uint16_t max_in= 1023;
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uint16_t max_out= 3.3;
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uint16_t voltage = (adc_val-min_in)*(max_out-min_out)/(max_in-min_in) + min_out;
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return voltage;
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} |