You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
46 lines
1.0 KiB
46 lines
1.0 KiB
#include <avr/io.h>
|
|
#include <stdbool.h>
|
|
|
|
#include "calc.h"
|
|
#include "adc.h"
|
|
|
|
/** Initialize the ADC */
|
|
void adc_init()
|
|
{
|
|
ADCSRA |= _BV(ADPS2) | _BV(ADPS1) | _BV(ADPS0); // 128 prescaler -> 125 kHz
|
|
ADMUX |= _BV(REFS0); // Voltage reference
|
|
sbi(ADCSRA, ADEN); // Enable ADC
|
|
}
|
|
|
|
|
|
/** Disable AD */
|
|
void adc_disable()
|
|
{
|
|
cbi(ADCSRA, ADEN);
|
|
}
|
|
|
|
|
|
/** Sample analog pin with 8-bit precision */
|
|
uint8_t adc_read_byte(uint8_t channel)
|
|
{
|
|
set_low_nibble(ADMUX, channel); // Select channel to sample
|
|
sbi(ADMUX, ADLAR); // Align result to left
|
|
sbi(ADCSRA, ADSC); // Start conversion
|
|
|
|
while(bit_is_high(ADCSRA, ADSC)); // Wait for it...
|
|
|
|
return ADCH; // The upper 8 bits of ADC result
|
|
}
|
|
|
|
|
|
/** Sample analog pin with 10-bit precision */
|
|
uint16_t adc_read_word(uint8_t channel)
|
|
{
|
|
set_low_nibble(ADMUX, channel); // Select channel to sample
|
|
cbi(ADMUX, ADLAR); // Align result to right
|
|
sbi(ADCSRA, ADSC); // Start conversion
|
|
|
|
while(get_bit(ADCSRA, ADSC)); // Wait for it...
|
|
|
|
return ADCW; // The whole ADC word (10 bits)
|
|
}
|
|
|