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https://github.com/digistump/DigistumpArduino.git
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262 lines
6.2 KiB
C
262 lines
6.2 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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#ifndef DEFAULT
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//For those with no ADC, need to define default.
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#define DEFAULT (0)
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#endif
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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( NUM_DIGITAL_PINS )
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if ( pin >= NUM_DIGITAL_PINS ) pin -= NUM_DIGITAL_PINS; // allow for channel or pin numbers
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#endif
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// fix? Validate pin?
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if(pin >= NUM_ANALOG_INPUTS) return 0; //Not a valid pin.
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//if(pin < 4) return 9; //Not a valid pin.
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#ifndef ADCSRA
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return digitalRead(analogInputToDigitalPin(pin)) ? 1023 : 0; //No ADC, so read as a digital pin instead.
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#endif
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#if defined(ADMUX)
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#if defined(MUX4)
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ADMUX = ((analog_reference & 0x03) << REFS0) | ((pin & 0x1F) << MUX0); //select the channel and reference
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#elif defined(MUX3)
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ADMUX = ((analog_reference & 0x03) << REFS0) | ((pin & 0x0F) << MUX0); //select the channel and reference
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#else
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ADMUX = ((analog_reference & 0x03) << REFS0) | ((pin & 0x07) << MUX0); //select the channel and reference
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#endif
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#endif
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#if defined(REFS2)
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ADMUX |= (((analog_reference & 0x04) >> 2) << REFS2); //some have an extra reference bit in a weird position.
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#endif
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#if defined(HAVE_ADC) && HAVE_ADC
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sbi(ADCSRA, ADSC); //Start conversion
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while(ADCSRA & (1<<ADSC)); //Wait for conversion to complete.
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uint8_t low = ADCL;
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uint8_t high = ADCH;
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return (high << 8) | low;
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#else
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return LOW;
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#endif
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}
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void pwmReset()
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{
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cbi(TCCR1D, OC1AV);
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cbi(TCCR1D, OC1AU);
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cbi(TCCR1D, OC1AW);
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cbi(TCCR1D, OC1AX);
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cbi(TCCR1D, OC1BV);
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cbi(TCCR1D, OC1BU);
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cbi(TCCR1D, OC1BW);
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cbi(TCCR1D, OC1BX);
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}
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void pwmWrite(uint8_t channel, int val)
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{
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if( channel == 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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sbi(TCCR1A, WGM10);
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cbi(TCCR1A, COM1A0);
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sbi(TCCR1B, WGM10);
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sbi(TCCR1B, CS11);
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//sbi(TCCR1B, CS10);
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OCR1A = val; // set pwm duty
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} else if( channel == 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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sbi(TCCR1A, WGM10);
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cbi(TCCR1A, COM1B0);
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sbi(TCCR1B, WGM10);
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sbi(TCCR1B, CS11);
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//sbi(TCCR1B, CS10);
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OCR1B = val; // set pwm duty
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}
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}
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void pwmConnect(uint8_t pin)
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{
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pinMode(pin,OUTPUT);
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if(pin == 2)
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sbi(TCCR1D, OC1AV);
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else if(pin == 0)
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sbi(TCCR1D, OC1AU);
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// cbi(TCCR1D, OC1AW);//used by crystal
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else if(pin == 3)
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sbi(TCCR1D, OC1AX);
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else if(pin == 4)
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sbi(TCCR1D, OC1BV);
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else if(pin == 1)
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sbi(TCCR1D, OC1BU);
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// cbi(TCCR1D, OC1BW);//used by crystal
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// sbi(TCCR1D, OC1BX);//reset pin
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}
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void pwmDisconnect(uint8_t pin)
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{
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pinMode(pin,OUTPUT);
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if(pin == 2)
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cbi(TCCR1D, OC1AV);
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else if(pin == 0)
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cbi(TCCR1D, OC1AU);
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// cbi(TCCR1D, OC1AW);//used by crystal
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else if(pin == 3)
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cbi(TCCR1D, OC1AX);
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else if(pin == 4)
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cbi(TCCR1D, OC1BV);
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else if(pin == 1)
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cbi(TCCR1D, OC1BU);
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// cbi(TCCR1D, OC1BW);//used by crystal
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// cbi(TCCR1D, OC1BX);//reset 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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uint8_t timer = digitalPinToTimer(pin);
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if( timer == TIMER0A){
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// connect pwm to pin 8 on timer 0, channel A
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sbi(TCCR0A, COM0A1);
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cbi(TCCR0A, COM0A0);
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sbi(TCCR0A, WGM01);
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sbi(TCCR0A, WGM00);
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OCR0A = val; // set pwm duty
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} else
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if( timer == 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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sbi(TCCR1A, WGM10);
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cbi(TCCR1A, COM1A0);
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sbi(TCCR1B, WGM10);
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sbi(TCCR1B, CS11);
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//sbi(TCCR1B, CS10);
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cbi(TCCR1D, OC1AV);
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cbi(TCCR1D, OC1AU);
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cbi(TCCR1D, OC1AW);
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cbi(TCCR1D, OC1AX);
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if(pin == 2)
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sbi(TCCR1D, OC1AV);
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else if(pin == 0)
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sbi(TCCR1D, OC1AU);
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else if(pin == 3)
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sbi(TCCR1D, OC1AX);
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OCR1A = val; // set pwm duty
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} else
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if( timer == 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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sbi(TCCR1A, WGM10);
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cbi(TCCR1A, COM1B0);
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sbi(TCCR1B, WGM10);
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sbi(TCCR1B, CS11);
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//sbi(TCCR1B, CS10);
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cbi(TCCR1D, OC1BV);
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cbi(TCCR1D, OC1BU);
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cbi(TCCR1D, OC1BW);
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cbi(TCCR1D, OC1BX);
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if(pin == 4)
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sbi(TCCR1D, OC1BV);
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else if(pin == 1)
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sbi(TCCR1D, OC1BU);
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OCR1B = val; // set pwm duty
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} else
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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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