| 59 |
pfowler |
1 |
#include <avr/io.h>
|
|
|
2 |
|
|
|
3 |
#include "util.h"
|
|
|
4 |
#include <util/delay.h>
|
|
|
5 |
|
|
|
6 |
#include <stdlib.h>
|
|
|
7 |
|
|
|
8 |
inline uint8_t map_8(uint8_t x, uint8_t in_min, uint8_t in_max, uint8_t out_min, uint8_t out_max) {
|
|
|
9 |
return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
|
|
|
10 |
}
|
|
|
11 |
|
|
|
12 |
uint8_t analogRead(uint8_t channel) {
|
|
|
13 |
ADMUX = (1<<ADLAR) | (1<<REFS0) | (0<<REFS1) | (channel & 0x0f);
|
|
|
14 |
ADCSRA |= (1<<ADSC); // Start converting
|
|
|
15 |
|
|
|
16 |
while (((ADCSRA >> ADSC) & 1)) {} //Wait until conversion finished
|
|
|
17 |
uint8_t result = ADCH;
|
|
|
18 |
//ADCSRA |= (0<<ADSC); // Stop converting
|
|
|
19 |
|
|
|
20 |
return result;
|
|
|
21 |
}
|
|
|
22 |
|
|
|
23 |
void analogInit() {
|
|
|
24 |
ACSR |= (1<<ACD); // Disable analog comparator
|
|
|
25 |
|
|
|
26 |
/*
|
|
|
27 |
Setup ADC
|
|
|
28 |
ADMUX: 8 bit mode, Avcc ref
|
|
|
29 |
ADCSRA: Enable, 128 prescale
|
|
|
30 |
*/
|
|
|
31 |
ADMUX = (1<<ADLAR) | (0<<REFS0) | (1<<REFS1);
|
|
|
32 |
ADCSRA = (1<<ADEN) | (1<<ADPS2) | (1<<ADPS1) | (1<<ADPS0) ;
|
|
|
33 |
}
|