/* adc.c */ /* n.avr.adc - AVR ADC Module. {{{ * * Copyright (C) 2005 Thomas Burg * * This program 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 2 of the License, or * (at your option) any later version. * * This program 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 this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * * Contact : * Email: * }}} */ #include "adc.h" #include "n/avr/utils/utils.h" #include /* Tested AVR check. */ #if defined (__AVR_ATmega8__) #elif defined (__AVR_ATmega8535__) #elif defined (__AVR_ATmega128__) #else # warning "adc: not tested on this chip." #endif /* +AutoDec */ /* -AutoDec */ /** Initialise adc. */ void adc_init (void) { /* REFS = 01: AVCC with external capacitor at AREF pin. * 11: Internal 2.56V Voltage Reference with external capacitor * at AREF pin. */ ADMUX = regv (REFS1, REFS0, ADLAR, MUX4, MUX3, MUX2, MUX1, MUX0, 1, 1, 0, 0, 0, 0, 0, 0); /* Adc enabled. */ ADCSR = regv (ADEN, ADSC, ADATE, ADIF, ADIE, ADPS2, ADPS1, ADPS0, 1, 0, 0, 1, 0, 1, 1, 1); } /** Change channel. */ void adc_mux (uint8_t c) { /* Choose adc. */ ADMUX = (ADMUX & 0xe0) | (c & 0x07); } /** Choose and start mesure on adc line. */ void adc_start (void) { /* Start mesure. */ ADCSR |= _BV (ADSC); }