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/*
* spreadspace avr utils
*
*
* Copyright (C) 2013 Christian Pointner <equinox@spreadspace.org>
* Othmar Gsenger <otti@wirdorange.org>
*
* This file is part of spreadspace avr utils.
*
* spreadspace avr utils is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* spreadspace avr utils is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.
*/
#include <avr/io.h>
#include "limits.h"
#include <LUFA/Drivers/Peripheral/ADC.h>
#define LIMITS_ADC_CHAN_NUM 8
#define LIMITS_ADC_CHAN ADC_CHANNEL8
#define LIMITS_RINGBUF_SIZE 5
/* HINT: this is compared to a sliding sum not an average! */
#define LIMITS_TH_CLOSE 800
#define LIMITS_TH_OPEN 2700
void limits_init(void)
{
ADC_Init(ADC_FREE_RUNNING | ADC_PRESCALE_128);
ADC_SetupChannel(LIMITS_ADC_CHAN_NUM);
ADC_StartReading(ADC_REFERENCE_AVCC | ADC_RIGHT_ADJUSTED | LIMITS_ADC_CHAN);
}
static uint16_t sum = 0;
void limits_task(void)
{
static uint16_t r[LIMITS_RINGBUF_SIZE] = { 0 };
static uint8_t idx = 0;
if(ADC_IsReadingComplete()) {
r[idx] = ADC_GetResult();
idx = (idx + 1) % LIMITS_RINGBUF_SIZE;
cli();
sum = 0;
uint8_t i;
for(i=0; i<LIMITS_RINGBUF_SIZE; ++i) sum += r[i];
sei();
}
}
limits_t limits_get(void)
{
if(sum < LIMITS_TH_CLOSE)
return close;
if(sum < LIMITS_TH_OPEN)
return moving;
return open;
}
const char* limits_to_string(limits_t limits)
{
switch(limits) {
case moving: return "...";
case open: return "opened";
case close: return "closed";
case both: return "error";
}
return "invalid"; // gcc - shut the fuck up!!!
}
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