From af59a3daa1335fa5e7d48be783f0225230fcd03e Mon Sep 17 00:00:00 2001 From: Nicolas Schodet Date: Fri, 4 Apr 2008 20:29:01 +0200 Subject: * digital/avr/modules/adc: - added host support. --- digital/avr/modules/adc/adc.avr.c | 73 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 digital/avr/modules/adc/adc.avr.c (limited to 'digital/avr/modules/adc/adc.avr.c') diff --git a/digital/avr/modules/adc/adc.avr.c b/digital/avr/modules/adc/adc.avr.c new file mode 100644 index 00000000..3bfdefa9 --- /dev/null +++ b/digital/avr/modules/adc/adc.avr.c @@ -0,0 +1,73 @@ +/* adc.avr.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: burg AT efrei DOT fr + * }}} */ +#include "common.h" +#include "adc.h" + +#include "modules/utils/utils.h" +#include "io.h" + +/* Tested AVR check. */ +#if defined (__AVR_ATmega8__) +#elif defined (__AVR_ATmega8535__) +#elif defined (__AVR_ATmega128__) +#elif defined (__AVR_ATmega64__) +#elif defined (__AVR_ATmega16__) +#else +# warning "adc: not tested on this chip." +#endif + +#if defined (__AVR_ATmega128__) +#else +/* If the ADCSRB register is not set, auto-trigger is equivalent to + * free-running mode. */ +# define ADFR ADATE +#endif + +/* ADC configuration. */ +/* REFS = 01: AVCC with external capacitor at AREF pin. + * 11: Internal 2.56V Voltage Reference with external capacitor + * at AREF pin. */ +#define ADMUX_CFG (regv (REFS1, REFS0, ADLAR, MUX4, MUX3, MUX2, MUX1, MUX0, \ + 1, 1, 0, 0, 0, 0, 0, 0)) +#define ADCSR_CFG (regv (ADEN, ADSC, ADFR, ADIF, ADIE, ADPS2, ADPS1, ADPS0, \ + 1, 0, 0, 1, 0, 0, 0, 0)) +#define ADCSR_CFG_115200 7 + +/** Initialise ADC. */ +void +adc_init (void) +{ + /* Low freq. */ + ADCSR = ADCSR_CFG | ADCSR_CFG_115200; +} + +/** Choose and start measure on ADC line. */ +void +adc_start (uint8_t c) +{ + /* Choose ADC. */ + ADMUX = ADMUX_CFG | (c & 0x07); + /* Start measure. */ + ADCSR |= _BV (ADSC); +} + -- cgit v1.2.3