mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-11-18 12:05:11 +00:00
77 lines
1.5 KiB
C
77 lines
1.5 KiB
C
/* Copyright Robert Olsson */
|
|
|
|
#include <avr/pgmspace.h>
|
|
#include <avr/fuse.h>
|
|
#include <avr/eeprom.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <dev/watchdog.h>
|
|
#include "params.h"
|
|
#include "rss2.h"
|
|
#include "contiki.h"
|
|
#include "adc.h"
|
|
#include "rss2.h"
|
|
|
|
uint16_t
|
|
adc_read(uint8_t pin)
|
|
{
|
|
uint16_t volt = 0;
|
|
int i;
|
|
|
|
ADMUX = pin; /* ADC pin PA0-PA7 -> 0-7 */
|
|
ADCSRB &= ~(1 << MUX5); /* Needs to write before ADMUX pp 418 */
|
|
ADMUX |= (1 << REFS1) | (1 << REFS0); /* 1.6 */
|
|
|
|
/* Maximal Track and Hold time */
|
|
|
|
ADCSRA = (1 << ADPS2) | (0 << ADPS1) | (1 << ADPS0); /* Prescaler /32 */
|
|
ADCSRA |= (1 << ADEN); /* Enable the ADC */
|
|
|
|
while(!(ADCSRB & (1 << AVDDOK))) ; /* Wait for AVDD ok */
|
|
while(!(ADCSRB & (1 << REFOK))) ; /* Wait for ref ok */
|
|
|
|
/* Ignore first result */
|
|
|
|
ADCSRA |= (1 << ADSC);
|
|
while(ADCSRA & _BV(ADSC)) {
|
|
}
|
|
|
|
ADCW = 0;
|
|
#define RES 4
|
|
|
|
for(i = 0; i < RES; i++) {
|
|
|
|
/* Start the conversion */
|
|
ADCSRA |= (1 << ADSC);
|
|
|
|
/* Wait for conversion */
|
|
while(ADCSRA & (1 << ADSC)) {
|
|
}
|
|
|
|
volt += ADCW;
|
|
}
|
|
ADMUX = 0; /* turn off internal vref */
|
|
volt = volt / RES;
|
|
|
|
/* Disable the ADC to save power */
|
|
ADCSRA &= ~_BV(ADEN);
|
|
|
|
return volt;
|
|
}
|
|
double
|
|
adc_read_v_in(void)
|
|
{
|
|
/* Special treatment for v_in. Schottky voltage drop add */
|
|
return ((double)adc_read(AV_IN)) * V_IN_FACTOR_SCHOTTKY + SCHOTTKY_DROP;
|
|
}
|
|
double
|
|
adc_read_a1(void)
|
|
{
|
|
return ((double)adc_read(A1)) * V_IN_FACTOR;
|
|
}
|
|
double
|
|
adc_read_a2(void)
|
|
{
|
|
return ((double)adc_read(A2)) * V_IN_FACTOR;
|
|
}
|