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141 lines
3.5 KiB
C
141 lines
3.5 KiB
C
/*
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wiring_analog.c - analog input and output
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Part of Arduino - http://www.arduino.cc/
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Copyright (c) 2005-2006 David A. Mellis
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General
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Public License along with this library; if not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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Boston, MA 02111-1307 USA
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$Id: wiring.c 248 2007-02-03 15:36:30Z mellis $
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Modified 28-08-2009 for attiny84 R.Wiersma
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Modified 14-10-2009 for attiny45 Saposoft
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Corrected 17-05-2010 for ATtiny84 B.Cook
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*/
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#include "wiring_private.h"
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#include "pins_arduino.h"
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#include "core_adc.h"
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#include "core_pins.h"
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#include "core_timers.h"
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#include "PwmTimer.h"
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uint8_t analog_reference = DEFAULT;
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void analogReference(uint8_t mode)
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{
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// can't actually set the register here because the default setting
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// will connect AVCC and the AREF pin, which would cause a short if
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// there's something connected to AREF.
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// fix? Validate the mode?
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analog_reference = mode;
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}
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int analogRead(uint8_t pin)
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{
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#if defined( CORE_ANALOG_FIRST )
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if ( pin >= CORE_ANALOG_FIRST ) pin -= CORE_ANALOG_FIRST; // allow for channel or pin numbers
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#endif
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// fix? Validate pin?
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ADC_SetVoltageReference( analog_reference );
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ADC_SetInputChannel( pin );
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ADC_StartConversion();
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while( ADC_ConversionInProgress() );
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return( ADC_GetDataRegister() );
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}
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// Right now, PWM output only works on the pins with
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// hardware support. These are defined in the appropriate
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// pins_*.c file. For the rest of the pins, we default
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// to digital output.
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void analogWrite(uint8_t pin, int val)
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{
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// We need to make sure the PWM output is enabled for those pins
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// that support it, as we turn it off when digitally reading or
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// writing with them. Also, make sure the pin is in output mode
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// for consistenty with Wiring, which doesn't require a pinMode
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// call for the analog output pins.
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pinMode(pin, OUTPUT);
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if (val <= 0)
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{
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digitalWrite(pin, LOW);
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}
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else if (val >= 255)
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{
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digitalWrite(pin, HIGH);
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}
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else
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{
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#if CORE_PWM_COUNT >= 1
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if ( pin == CORE_PWM0_PIN )
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{
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Pwm0_SetCompareOutputMode( Pwm0_Clear );
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Pwm0_SetOutputCompareMatch( val );
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}
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else
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#endif
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#if CORE_PWM_COUNT >= 2
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if ( pin == CORE_PWM1_PIN )
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{
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Pwm1_SetCompareOutputMode( Pwm1_Clear );
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Pwm1_SetOutputCompareMatch( val );
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}
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else
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#endif
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#if CORE_PWM_COUNT >= 3
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if ( pin == CORE_PWM2_PIN )
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{
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Pwm2_SetCompareOutputMode( Pwm2_Clear );
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Pwm2_SetOutputCompareMatch( val );
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}
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else
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#endif
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#if CORE_PWM_COUNT >= 4
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if ( pin == CORE_PWM3_PIN )
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{
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Pwm3_SetCompareOutputMode( Pwm3_Clear );
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Pwm3_SetOutputCompareMatch( val );
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}
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else
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#endif
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#if CORE_PWM_COUNT >= 5
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#error Only 4 PWM pins are supported. Add more conditions.
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#endif
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{
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if (val < 128)
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{
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digitalWrite(pin, LOW);
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}
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else
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{
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digitalWrite(pin, HIGH);
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}
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}
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}
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}
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