111 lines
4.3 KiB
C
111 lines
4.3 KiB
C
/*
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* Copyright (c) 2008 Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of the copyright holders nor the names of
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* \brief
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* Functions to control the ADC of the MCU. This is used to read the
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* joystick.
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*
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* \author
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* Mike Vidales mavida404@gmail.com
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*
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*/
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#ifndef ADC_H_
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#define ADC_H_
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#include <avr/io.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <stdbool.h>
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#define adc_conversion_ongoing (ADCSRA |= (1<<ADSC))
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#define adc_conversion_done (!(ADCSRA |= (1<<ADSC)))
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/** \brief Lists the different ways in which the ADC can be triggered. */
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typedef enum {
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ADC_TRIG_FREE_RUN = ((0<<ADTS2)|(0<<ADTS1)|(0<<ADTS0)),
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ADC_TRIG_ANACOMP = ((0<<ADTS2)|(0<<ADTS1)|(1<<ADTS0)),
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ADC_TRIG_EXTINT0 = ((0<<ADTS2)|(1<<ADTS1)|(0<<ADTS0)),
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ADC_TRIG_TIM0_COMPA = ((0<<ADTS2)|(1<<ADTS1)|(1<<ADTS0)),
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ADC_TRIG_TIM0_OVF = ((1<<ADTS2)|(0<<ADTS1)|(0<<ADTS0)),
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ADC_TRIG_TIM1_COMPB = ((1<<ADTS2)|(0<<ADTS1)|(1<<ADTS0)),
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ADC_TRIG_TIM1_OVF = ((1<<ADTS2)|(1<<ADTS1)|(0<<ADTS0)),
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ADC_TRIG_TIM1_CAPT = ((1<<ADTS2)|(1<<ADTS1)|(1<<ADTS0))
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} adc_trig_t;
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/** \brief Lists a variety of prescalers used with the ADC. */
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typedef enum {
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ADC_PS_2 = ((0<<ADPS2)|(0<<ADPS1)|(1<<ADPS0)),
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ADC_PS_4 = ((0<<ADPS2)|(1<<ADPS1)|(0<<ADPS0)),
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ADC_PS_8 = ((0<<ADPS2)|(1<<ADPS1)|(1<<ADPS0)),
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ADC_PS_16 = ((1<<ADPS2)|(0<<ADPS1)|(0<<ADPS0)),
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ADC_PS_32 = ((1<<ADPS2)|(0<<ADPS1)|(1<<ADPS0)),
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ADC_PS_64 = ((1<<ADPS2)|(1<<ADPS1)|(0<<ADPS0)),
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ADC_PS_128 = ((1<<ADPS2)|(1<<ADPS1)|(1<<ADPS0))
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} adc_ps_t;
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/**
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* \brief Lists the ways in which the voltage reference can be configured
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* for use with the ADC.
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*/
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typedef enum {
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ADC_REF_AREF = ((0<<REFS1)|(0<<REFS0)),
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ADC_REF_AVCC = ((0<<REFS1)|(1<<REFS0)),
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ADC_REF_INT = ((1<<REFS1)|(1<<REFS0))
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} adc_ref_t;
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/** \brief Lists each channel's mask value for the ADC MUX. */
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typedef enum {
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ADC_CHAN_ADC0 = ((0<<MUX4)|(0<<MUX3)|(0<<MUX2)|(0<<MUX1)|(0<<MUX0)),
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ADC_CHAN_ADC1 = ((0<<MUX4)|(0<<MUX3)|(0<<MUX2)|(0<<MUX1)|(1<<MUX0)),
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ADC_CHAN_ADC2 = ((0<<MUX4)|(0<<MUX3)|(0<<MUX2)|(1<<MUX1)|(0<<MUX0)),
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ADC_CHAN_ADC3 = ((0<<MUX4)|(0<<MUX3)|(0<<MUX2)|(1<<MUX1)|(1<<MUX0)),
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ADC_CHAN_ADC4 = ((0<<MUX4)|(0<<MUX3)|(1<<MUX2)|(0<<MUX1)|(0<<MUX0)),
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ADC_CHAN_ADC5 = ((0<<MUX4)|(0<<MUX3)|(1<<MUX2)|(0<<MUX1)|(1<<MUX0)),
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ADC_CHAN_ADC6 = ((0<<MUX4)|(0<<MUX3)|(1<<MUX2)|(1<<MUX1)|(0<<MUX0)),
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ADC_CHAN_ADC7 = ((0<<MUX4)|(0<<MUX3)|(1<<MUX2)|(1<<MUX1)|(1<<MUX0))
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} adc_chan_t;
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/** \brief Lists the two ADC adjustment values. */
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typedef enum {
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ADC_ADJ_RIGHT = 0,
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ADC_ADJ_LEFT = 1
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} adc_adj_t;
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int adc_init(adc_chan_t chan, adc_trig_t trig, adc_ref_t ref, adc_ps_t prescale);
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void adc_deinit(void);
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int adc_conversion_start(void);
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int16_t adc_result_get(adc_adj_t adjust);
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#endif /* ADC_H_ */
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