241 lines
5.8 KiB
C
241 lines
5.8 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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Modified 28 September 2010 by Mark Sproul
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$Id: wiring.c 248 2007-02-03 15:36:30Z mellis $
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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 "adc.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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analog_reference = mode;
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}
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int analogRead(uint8_t pin)
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{
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return readADC(pin);
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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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switch(digitalPinToTimer(pin))
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{
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// XXX fix needed for atmega8
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#if defined(TCCR0) && defined(COM00) && !defined(__AVR_ATmega8__)
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case TIMER0A:
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// connect pwm to pin on timer 0
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sbi(TCCR0, COM00);
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OCR0 = val; // set pwm duty
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break;
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#endif
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#if defined(TCCR0A) && defined(COM0A1)
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case TIMER0A:
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// connect pwm to pin on timer 0, channel A
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sbi(TCCR0A, COM0A1);
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OCR0A = val; // set pwm duty
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break;
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#endif
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#if defined(TCCR0A) && defined(COM0B1)
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case TIMER0B:
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// connect pwm to pin on timer 0, channel B
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sbi(TCCR0A, COM0B1);
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OCR0B = val; // set pwm duty
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break;
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#endif
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#if defined(TCCR1A) && defined(COM1A1)
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case TIMER1A:
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// connect pwm to pin on timer 1, channel A
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sbi(TCCR1A, COM1A1);
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OCR1A = val; // set pwm duty
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break;
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#endif
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#if defined(TCCR1A) && defined(COM1B1)
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case TIMER1B:
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// connect pwm to pin on timer 1, channel B
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sbi(TCCR1A, COM1B1);
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OCR1B = val; // set pwm duty
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break;
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#endif
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#if defined(TCCR1A) && defined(COM1C1)
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case TIMER1C:
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// connect pwm to pin on timer 1, channel C
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sbi(TCCR1A, COM1C1);
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OCR1C = val; // set pwm duty
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break;
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#endif
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#if defined(TCCR2) && defined(COM21)
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case TIMER2:
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// connect pwm to pin on timer 2
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sbi(TCCR2, COM21);
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OCR2 = val; // set pwm duty
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break;
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#endif
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#if defined(TCCR2A) && defined(COM2A1)
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case TIMER2A:
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// connect pwm to pin on timer 2, channel A
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sbi(TCCR2A, COM2A1);
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OCR2A = val; // set pwm duty
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break;
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#endif
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#if defined(TCCR2A) && defined(COM2B1)
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case TIMER2B:
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// connect pwm to pin on timer 2, channel B
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sbi(TCCR2A, COM2B1);
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OCR2B = val; // set pwm duty
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break;
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#endif
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#if defined(TCCR3A) && defined(COM3A1)
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case TIMER3A:
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// connect pwm to pin on timer 3, channel A
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sbi(TCCR3A, COM3A1);
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OCR3A = val; // set pwm duty
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break;
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#endif
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#if defined(TCCR3A) && defined(COM3B1)
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case TIMER3B:
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// connect pwm to pin on timer 3, channel B
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sbi(TCCR3A, COM3B1);
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OCR3B = val; // set pwm duty
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break;
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#endif
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#if defined(TCCR3A) && defined(COM3C1)
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case TIMER3C:
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// connect pwm to pin on timer 3, channel C
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sbi(TCCR3A, COM3C1);
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OCR3C = val; // set pwm duty
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break;
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#endif
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#if defined(TCCR4A)
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case TIMER4A:
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//connect pwm to pin on timer 4, channel A
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sbi(TCCR4A, COM4A1);
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#if defined(COM4A0) // only used on 32U4
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cbi(TCCR4A, COM4A0);
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#endif
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OCR4A = val; // set pwm duty
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break;
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#endif
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#if defined(TCCR4A) && defined(COM4B1)
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case TIMER4B:
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// connect pwm to pin on timer 4, channel B
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sbi(TCCR4A, COM4B1);
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OCR4B = val; // set pwm duty
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break;
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#endif
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#if defined(TCCR4A) && defined(COM4C1)
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case TIMER4C:
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// connect pwm to pin on timer 4, channel C
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sbi(TCCR4A, COM4C1);
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OCR4C = val; // set pwm duty
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break;
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#endif
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#if defined(TCCR4C) && defined(COM4D1)
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case TIMER4D:
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// connect pwm to pin on timer 4, channel D
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sbi(TCCR4C, COM4D1);
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#if defined(COM4D0) // only used on 32U4
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cbi(TCCR4C, COM4D0);
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#endif
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OCR4D = val; // set pwm duty
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break;
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#endif
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#if defined(TCCR5A) && defined(COM5A1)
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case TIMER5A:
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// connect pwm to pin on timer 5, channel A
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sbi(TCCR5A, COM5A1);
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OCR5A = val; // set pwm duty
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break;
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#endif
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#if defined(TCCR5A) && defined(COM5B1)
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case TIMER5B:
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// connect pwm to pin on timer 5, channel B
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sbi(TCCR5A, COM5B1);
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OCR5B = val; // set pwm duty
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break;
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#endif
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#if defined(TCCR5A) && defined(COM5C1)
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case TIMER5C:
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// connect pwm to pin on timer 5, channel C
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sbi(TCCR5A, COM5C1);
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OCR5C = val; // set pwm duty
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break;
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#endif
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case NOT_ON_TIMER:
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default:
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if (val < 128) {
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digitalWrite(pin, LOW);
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} else {
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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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