/* $Id$ */ /* * Copyright (c) 2011 Dimitri Sokolyuk * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include #include "kernel.h" #include "tasks.h" uint16_t rdadc(uint8_t ch) { ADMUX &= ~0x07; ADMUX |= (ch & 0x07); ADCSRA |= _BV(ADSC); loop_until_bit_is_set(ADCSRA, ADSC); return ADCW; } void adc(void *arg) { struct adcarg *a = (struct adcarg *)arg; a->r = release(); a->d = deadline(); /* prescale 8 */ ADCSRA |= (_BV(ADEN) | _BV(ADFR) | _BV(ADPS1) | _BV(ADPS0)); for (;;) { *a->value = rdadc(a->channel); a->r = a->d += MSEC(20); update(a->r, a->d); } }