74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
#ifndef ADC_H
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#define ADC_H
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#include <avr/io.h>
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#include "mystd.h"
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typedef enum e_adc_ref {
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ADC_AREF = 0,
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ADC_AVCC = BV(REFS0),
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ADC_INT = BV(REFS0) | BV(REFS1),
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_ADC_REF_MASK = BV(REFS0) | BV(REFS1),
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} e_adc_ref;
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typedef enum e_adc_size {
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ADC_10BIT = 0,
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ADC_8BIT = BV(ADLAR),
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_ADC_SIZE_MASK = BV(ADLAR),
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} e_adc_size;
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typedef enum e_adc_prescaler {
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ADC_PRESCALER_2 = BV(ADPS0),
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ADC_PRESCALER_4 = BV(ADPS1),
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ADC_PRESCALER_8 = BV(ADPS1) | BV(ADPS0),
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ADC_PRESCALER_16 = BV(ADPS2),
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ADC_PRESCALER_32 = BV(ADPS2) | BV(ADPS0),
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ADC_PRESCALER_64 = BV(ADPS2) | BV(ADPS1),
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ADC_PRESCALER_128 = BV(ADPS2) | BV(ADPS1) | BV(ADPS0),
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_ADC_PRESCALER_MASK = BV(ADPS2) | BV(ADPS1) | BV(ADPS0),
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} e_adc_prescaler;
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typedef enum e_adc_input {
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ADC_ADC0 = 0,
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ADC_ADC1 = BV(MUX0),
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ADC_ADC2 = BV(MUX1),
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ADC_ADC3 = BV(MUX0) | BV(MUX1),
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ADC_ADC4 = BV(MUX2),
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ADC_ADC5 = BV(MUX2) | BV(MUX0),
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ADC_ADC6 = BV(MUX2) | BV(MUX1),
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ADC_ADC7 = BV(MUX2) | BV(MUX1) | BV(MUX0),
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ADC_TEMP = BV(MUX3),
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ADC_11V = BV(MUX3) | BV(MUX2) | BV(MUX1),
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ADC_0V = BV(MUX3) | BV(MUX2) | BV(MUX1) | BV(MUX0),
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_ADC_INPUT_MASK = BV(MUX0) | BV(MUX1) | BV(MUX2) | BV(MUX3),
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} e_adc_input;
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static inline uint8_t adc_read_pin(e_adc_input input) {
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ADMUX = (ADMUX & ~(_ADC_INPUT_MASK | _ADC_SIZE_MASK)) | input | BV(ADLAR);
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ADCSRA |= BV(ADSC);
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while (ADCSRA & BV(ADSC))
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;
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return ADCH;
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}
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static inline uint16_t adc_read_pin_10bit(e_adc_input input) {
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ADMUX = (ADMUX & ~(_ADC_SIZE_MASK | _ADC_INPUT_MASK)) | (input & _ADC_INPUT_MASK);
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ADCSRA |= BV(ADSC);
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while (ADCSRA & BV(ADSC))
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;
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return ADC;
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}
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static inline void adc_init(e_adc_ref v_ref, e_adc_prescaler prescaler) {
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ADMUX = (ADMUX & ~(_ADC_REF_MASK)) | v_ref;
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ADCSRA = BV(ADEN) | (prescaler & _ADC_PRESCALER_MASK);
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(void)adc_read_pin(0);
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}
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#endif /* ADC_H */
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