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