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136 lines
3.4 KiB
C
136 lines
3.4 KiB
C
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/*
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wiring_digital.c - digital input and output functions
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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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*/
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#include "wiring_private.h"
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// Get the hardware port of the given virtual pin number. This comes from
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// the pins_*.c file for the active board configuration.
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int digitalPinToPort(int pin)
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{
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return digital_pin_to_port[pin].port;
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}
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// Get the bit location within the hardware port of the given virtual pin.
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// This comes from the pins_*.c file for the active board configuration.
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int digitalPinToBit(int pin)
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{
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return digital_pin_to_port[pin].bit;
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}
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int analogOutPinToTimer(int pin)
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{
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return analog_out_pin_to_timer[pin];
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}
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int analogInPinToBit(int pin)
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{
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return analog_in_pin_to_port[pin].bit;
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}
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void pinMode(int pin, int mode)
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{
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if (digitalPinToPort(pin) != NOT_A_PIN) {
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if (mode == INPUT)
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cbi(_SFR_IO8(port_to_mode[digitalPinToPort(pin)]),
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digitalPinToBit(pin));
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else
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sbi(_SFR_IO8(port_to_mode[digitalPinToPort(pin)]),
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digitalPinToBit(pin));
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}
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}
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void digitalWrite(int pin, int val)
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{
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if (digitalPinToPort(pin) != NOT_A_PIN) {
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// If the pin that support PWM output, we need to turn it off
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// before doing a digital write.
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if (analogOutPinToTimer(pin) == TIMER1A)
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cbi(TCCR1A, COM1A1);
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if (analogOutPinToTimer(pin) == TIMER1B)
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cbi(TCCR1A, COM1B1);
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#if defined(__AVR_ATmega168__)
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if (analogOutPinToTimer(pin) == TIMER0A)
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cbi(TCCR0A, COM0A1);
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if (analogOutPinToTimer(pin) == TIMER0B)
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cbi(TCCR0A, COM0B1);
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if (analogOutPinToTimer(pin) == TIMER2A)
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cbi(TCCR2A, COM2A1);
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if (analogOutPinToTimer(pin) == TIMER2B)
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cbi(TCCR2A, COM2B1);
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#else
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if (analogOutPinToTimer(pin) == TIMER2)
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cbi(TCCR2, COM21);
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#endif
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if (val == LOW)
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cbi(_SFR_IO8(port_to_output[digitalPinToPort(pin)]),
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digitalPinToBit(pin));
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else
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sbi(_SFR_IO8(port_to_output[digitalPinToPort(pin)]),
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digitalPinToBit(pin));
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}
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}
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int digitalRead(int pin)
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{
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if (digitalPinToPort(pin) != NOT_A_PIN) {
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// If the pin that support PWM output, we need to turn it off
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// before getting a digital reading.
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if (analogOutPinToTimer(pin) == TIMER1A)
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cbi(TCCR1A, COM1A1);
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if (analogOutPinToTimer(pin) == TIMER1B)
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cbi(TCCR1A, COM1B1);
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#if defined(__AVR_ATmega168__)
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if (analogOutPinToTimer(pin) == TIMER0A)
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cbi(TCCR0A, COM0A1);
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if (analogOutPinToTimer(pin) == TIMER0B)
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cbi(TCCR0A, COM0B1);
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if (analogOutPinToTimer(pin) == TIMER2A)
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cbi(TCCR2A, COM2A1);
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if (analogOutPinToTimer(pin) == TIMER2B)
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cbi(TCCR2A, COM2B1);
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#else
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if (analogOutPinToTimer(pin) == TIMER2)
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cbi(TCCR2, COM21);
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#endif
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return (_SFR_IO8(port_to_input[digitalPinToPort(pin)]) >>
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digitalPinToBit(pin)) & 0x01;
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}
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return LOW;
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}
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