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-rwxr-xr-xcore/arduino/wiring_analog.c110
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diff --git a/core/arduino/wiring_analog.c b/core/arduino/wiring_analog.c
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--- a/core/arduino/wiring_analog.c
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-/*
- wiring_analog.c - analog input and output
- Part of Arduino - http://www.arduino.cc/
-
- Copyright (c) 2005-2006 David A. Mellis
-
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- This library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General
- Public License along with this library; if not, write to the
- Free Software Foundation, Inc., 59 Temple Place, Suite 330,
- Boston, MA 02111-1307 USA
-
- $Id: wiring.c 248 2007-02-03 15:36:30Z mellis $
-*/
-
-#include "wiring_private.h"
-#include "pins_arduino.h"
-
-int analogRead(uint8_t pin)
-{
- uint8_t low, high, ch = analogInPinToBit(pin);
-
- // the low 4 bits of ADMUX select the ADC channel
- ADMUX = (ADMUX & (unsigned int) 0xf0) | (ch & (unsigned int) 0x0f);
-
- // without a delay, we seem to read from the wrong channel
- //delay(1);
-
- // start the conversion
- sbi(ADCSRA, ADSC);
-
- // ADSC is cleared when the conversion finishes
- while (bit_is_set(ADCSRA, ADSC));
-
- // we have to read ADCL first; doing so locks both ADCL
- // and ADCH until ADCH is read. reading ADCL second would
- // cause the results of each conversion to be discarded,
- // as ADCL and ADCH would be locked when it completed.
- low = ADCL;
- high = ADCH;
-
- // combine the two bytes
- return (high << 8) | low;
-}
-
-// Right now, PWM output only works on the pins with
-// hardware support. These are defined in the appropriate
-// pins_*.c file. For the rest of the pins, we default
-// to digital output.
-void analogWrite(uint8_t pin, int val)
-{
- // We need to make sure the PWM output is enabled for those pins
- // that support it, as we turn it off when digitally reading or
- // writing with them. Also, make sure the pin is in output mode
- // for consistenty with Wiring, which doesn't require a pinMode
- // call for the analog output pins.
- pinMode(pin, OUTPUT);
-
- if (digitalPinToTimer(pin) == TIMER1A) {
- // connect pwm to pin on timer 1, channel A
- sbi(TCCR1A, COM1A1);
- // set pwm duty
- OCR1A = val;
- } else if (digitalPinToTimer(pin) == TIMER1B) {
- // connect pwm to pin on timer 1, channel B
- sbi(TCCR1A, COM1B1);
- // set pwm duty
- OCR1B = val;
-#if defined(__AVR_ATmega168__)
- } else if (digitalPinToTimer(pin) == TIMER0A) {
- // connect pwm to pin on timer 0, channel A
- sbi(TCCR0A, COM0A1);
- // set pwm duty
- OCR0A = val;
- } else if (digitalPinToTimer(pin) == TIMER0B) {
- // connect pwm to pin on timer 0, channel B
- sbi(TCCR0A, COM0B1);
- // set pwm duty
- OCR0B = val;
- } else if (digitalPinToTimer(pin) == TIMER2A) {
- // connect pwm to pin on timer 2, channel A
- sbi(TCCR2A, COM2A1);
- // set pwm duty
- OCR2A = val;
- } else if (digitalPinToTimer(pin) == TIMER2B) {
- // connect pwm to pin on timer 2, channel B
- sbi(TCCR2A, COM2B1);
- // set pwm duty
- OCR2B = val;
-#else
- } else if (digitalPinToTimer(pin) == TIMER2) {
- // connect pwm to pin on timer 2, channel B
- sbi(TCCR2, COM21);
- // set pwm duty
- OCR2 = val;
-#endif
- } else if (val < 128)
- digitalWrite(pin, LOW);
- else
- digitalWrite(pin, HIGH);
-}