72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
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/*
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* analog.h
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*
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* Lightweight macro implementation of Arduino style pin numbering
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* for AVR microprocessors. Because only thing I want to use from
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* Arduino libraries is the pin numbering scheme.
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*
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* This file taken 60% from the excellent ArduinoLite project by
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* Shikai Chen <csk@live.com>. Part of the code from Teensy examples
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* by PJRC.COM, LLC. Some minor additions to suite my personal coding
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* taste.
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*
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* http://code.google.com/p/arduino-lite/
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* http://www.csksoft.net/
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*
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* Copyright (c) 2010-2011 Shikai Chen, PJRC.COM LLC, Mika Tuupola
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*
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* Licensed under the LGPL 2.1 license:
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* http://www.opensource.org/licenses/lgpl-2.1.php
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*/
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#ifndef ANALOG_H
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#define ANALOG_H
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#include "pins.h"
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#define PWM_ENABLE(pin) EXPAND_WRAPPER(_PWM_ENABLE ,ARDUINOPIN_TO_TCCRID(pin) , ARDUINOPIN_TO_TIMERID(pin) )
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#define PWM_DISABLE(pin) EXPAND_WRAPPER(_PWM_DISABLE ,ARDUINOPIN_TO_TCCRID(pin) , ARDUINOPIN_TO_TIMERID(pin) )
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#define PWM_SET(pin, val) EXPAND_WRAPPER(_PWM_SET, ARDUINOPIN_TO_TIMERID(pin), val )
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#define analog_write( pin, val ) \
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do{ \
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PWM_ENABLE(pin); \
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PWM_SET(pin,val); \
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} \
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while(0)
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#define PWM_SET_SAFE(pin, val) \
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do{ \
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if (val) {PIN_MODE(pin,OUTPUT);PWM_SET(pin, val);} \
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else PIN_MODE(pin, INPUT); \
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}while(0)
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uint16_t analog_read(uint8_t pin);
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uint8_t analog_read_byte(uint8_t pin);
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#define ADC_REF_VCC (1<<REFS0) /* Power supply. Usually 5V */
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#define ADC_REF_INTERNAL ((1<<REFS1) | (1<<REFS0)) /* Internal 2.56V */
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#define ADC_REF_EXTERNAL (0)
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/* Taken from Teensy example code: http://www.pjrc.com/teensy/adc.html */
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#if F_CPU == 16000000L
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#define ADC_PRESCALER ((1<<ADPS2) | (1<<ADPS1))
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#elif F_CPU == 8000000L
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#define ADC_PRESCALER ((1<<ADPS2) | (1<<ADPS0))
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#elif F_CPU == 4000000L
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#define ADC_PRESCALER ((1<<ADPS2))
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#elif F_CPU == 2000000L
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#define ADC_PRESCALER ((1<<ADPS1) | (1<<ADPS0))
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#elif F_CPU == 1000000L
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#define ADC_PRESCALER ((1<<ADPS1))
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#else
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#define ADC_PRESCALER ((1<<ADPS0))
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#endif
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#ifndef ADHSM
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#define ADHSM (7)
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#endif
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#endif /* ANALOG_H */
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