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Diffstat (limited to 'cores/robot/wiring_digital.c')
| -rw-r--r-- | cores/robot/wiring_digital.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/cores/robot/wiring_digital.c b/cores/robot/wiring_digital.c new file mode 100644 index 0000000..be323b1 --- /dev/null +++ b/cores/robot/wiring_digital.c @@ -0,0 +1,178 @@ +/* + wiring_digital.c - digital input and output functions + 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 + + Modified 28 September 2010 by Mark Sproul + + $Id: wiring.c 248 2007-02-03 15:36:30Z mellis $ +*/ + +#define ARDUINO_MAIN +#include "wiring_private.h" +#include "pins_arduino.h" + +void pinMode(uint8_t pin, uint8_t mode) +{ + uint8_t bit = digitalPinToBitMask(pin); + uint8_t port = digitalPinToPort(pin); + volatile uint8_t *reg, *out; + + if (port == NOT_A_PIN) return; + + // JWS: can I let the optimizer do this? + reg = portModeRegister(port); + out = portOutputRegister(port); + + if (mode == INPUT) { + uint8_t oldSREG = SREG; + cli(); + *reg &= ~bit; + *out &= ~bit; + SREG = oldSREG; + } else if (mode == INPUT_PULLUP) { + uint8_t oldSREG = SREG; + cli(); + *reg &= ~bit; + *out |= bit; + SREG = oldSREG; + } else { + uint8_t oldSREG = SREG; + cli(); + *reg |= bit; + SREG = oldSREG; + } +} + +// Forcing this inline keeps the callers from having to push their own stuff +// on the stack. It is a good performance win and only takes 1 more byte per +// user than calling. (It will take more bytes on the 168.) +// +// But shouldn't this be moved into pinMode? Seems silly to check and do on +// each digitalread or write. +// +// Mark Sproul: +// - Removed inline. Save 170 bytes on atmega1280 +// - changed to a switch statment; added 32 bytes but much easier to read and maintain. +// - Added more #ifdefs, now compiles for atmega645 +// +//static inline void turnOffPWM(uint8_t timer) __attribute__ ((always_inline)); +//static inline void turnOffPWM(uint8_t timer) +static void turnOffPWM(uint8_t timer) +{ + switch (timer) + { + #if defined(TCCR1A) && defined(COM1A1) + case TIMER1A: cbi(TCCR1A, COM1A1); break; + #endif + #if defined(TCCR1A) && defined(COM1B1) + case TIMER1B: cbi(TCCR1A, COM1B1); break; + #endif + + #if defined(TCCR2) && defined(COM21) + case TIMER2: cbi(TCCR2, COM21); break; + #endif + + #if defined(TCCR0A) && defined(COM0A1) + case TIMER0A: cbi(TCCR0A, COM0A1); break; + #endif + + #if defined(TIMER0B) && defined(COM0B1) + case TIMER0B: cbi(TCCR0A, COM0B1); break; + #endif + #if defined(TCCR2A) && defined(COM2A1) + case TIMER2A: cbi(TCCR2A, COM2A1); break; + #endif + #if defined(TCCR2A) && defined(COM2B1) + case TIMER2B: cbi(TCCR2A, COM2B1); break; + #endif + + #if defined(TCCR3A) && defined(COM3A1) + case TIMER3A: cbi(TCCR3A, COM3A1); break; + #endif + #if defined(TCCR3A) && defined(COM3B1) + case TIMER3B: cbi(TCCR3A, COM3B1); break; + #endif + #if defined(TCCR3A) && defined(COM3C1) + case TIMER3C: cbi(TCCR3A, COM3C1); break; + #endif + + #if defined(TCCR4A) && defined(COM4A1) + case TIMER4A: cbi(TCCR4A, COM4A1); break; + #endif + #if defined(TCCR4A) && defined(COM4B1) + case TIMER4B: cbi(TCCR4A, COM4B1); break; + #endif + #if defined(TCCR4A) && defined(COM4C1) + case TIMER4C: cbi(TCCR4A, COM4C1); break; + #endif + #if defined(TCCR4C) && defined(COM4D1) + case TIMER4D: cbi(TCCR4C, COM4D1); break; + #endif + + #if defined(TCCR5A) + case TIMER5A: cbi(TCCR5A, COM5A1); break; + case TIMER5B: cbi(TCCR5A, COM5B1); break; + case TIMER5C: cbi(TCCR5A, COM5C1); break; + #endif + } +} + +void digitalWrite(uint8_t pin, uint8_t val) +{ + uint8_t timer = digitalPinToTimer(pin); + uint8_t bit = digitalPinToBitMask(pin); + uint8_t port = digitalPinToPort(pin); + volatile uint8_t *out; + + if (port == NOT_A_PIN) return; + + // If the pin that support PWM output, we need to turn it off + // before doing a digital write. + if (timer != NOT_ON_TIMER) turnOffPWM(timer); + + out = portOutputRegister(port); + + uint8_t oldSREG = SREG; + cli(); + + if (val == LOW) { + *out &= ~bit; + } else { + *out |= bit; + } + + SREG = oldSREG; +} + +int digitalRead(uint8_t pin) +{ + uint8_t timer = digitalPinToTimer(pin); + uint8_t bit = digitalPinToBitMask(pin); + uint8_t port = digitalPinToPort(pin); + + if (port == NOT_A_PIN) return LOW; + + // If the pin that support PWM output, we need to turn it off + // before getting a digital reading. + if (timer != NOT_ON_TIMER) turnOffPWM(timer); + + if (*portInputRegister(port) & bit) return HIGH; + return LOW; +} |