An arduino library to communicate using the Dallas one-wire protocol, where the Arduino takes the role of a slave.
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#ifndef _LowLevel_h
#define _LowLevel_h
#include <inttypes.h>
#ifdef VS_INTELLISENSE
#define __attribute__()
#endif
#if ARDUINO >= 100
#include "Arduino.h" // for delayMicroseconds, digitalPinToBitMask, etc
#else
#include "WProgram.h" // for delayMicroseconds
#include "pins_arduino.h" // for digitalPinToBitMask, etc
#endif
#if defined(__AVR__)
#define PIN_TO_BASEREG(pin) (portInputRegister(digitalPinToPort(pin)))
#define PIN_TO_BITMASK(pin) (digitalPinToBitMask(pin))
#define IO_REG_TYPE uint8_t
#define IO_REG_ASM asm("r30")
#define DIRECT_READ(base, mask) (((*(base)) & (mask)) ? 1 : 0)
#define DIRECT_MODE_INPUT(base, mask) ((*((base)+1)) &= ~(mask))
#define DIRECT_MODE_OUTPUT(base, mask) ((*((base)+1)) |= (mask))
#define DIRECT_WRITE_LOW(base, mask) ((*((base)+2)) &= ~(mask))
#define DIRECT_WRITE_HIGH(base, mask) ((*((base)+2)) |= (mask))
#if defined (__AVR_ATtiny85__)
#define CLEARINTERRUPT GIFR |= (1 << INTF0)
#include "UserTimer.h" //ATtiny-support based on TinyCore1 Arduino-core for ATtiny at http://github.com/Coding-Badly/TinyCore1.git
__attribute__((always_inline)) static inline void UserTimer_Init( void )
{
UserTimer_SetToPowerup();
UserTimer_SetWaveformGenerationMode(UserTimer_(CTC_OCR));
}
__attribute__((always_inline)) static inline void UserTimer_Run(short skipTicks)
{
UserTimer_SetCount(0);
UserTimer_SetOutputCompareMatchAndClear(skipTicks);
UserTimer_ClockSelect(UserTimer_(Prescale_Value_64));
}
#define UserTimer_Stop() UserTimer_ClockSelect(UserTimer_(Stopped))
#elif defined (__AVR_ATmega328P__)
#define CLEARINTERRUPT EIFR |= (1 << INTF0)
#define USERTIMER_COMPA_vect TIMER1_COMPA_vect
__attribute__((always_inline)) static inline void UserTimer_Init( void )
{
TCCR1A = 0;
TCCR1B = 0;
// enable timer compare interrupt
TIMSK1 |= (1 << OCIE1A);
}
__attribute__((always_inline)) static inline void UserTimer_Run(short skipTicks)
{
TCNT1 = 0;
OCR1A = skipTicks;
// turn on CTC mode with 64 prescaler
TCCR1B = (1 << WGM12) | (1 << CS11) | (1 << CS10);
}
#define UserTimer_Stop() TCCR1B = 0
#endif
#elif defined(__MK20DX128__) || defined(__MK20DX256__)
#define PIN_TO_BASEREG(pin) (portOutputRegister(pin))
#define PIN_TO_BITMASK(pin) (1)
#define IO_REG_TYPE uint8_t
#define IO_REG_ASM
#define DIRECT_READ(base, mask) (*((base)+512))
#define DIRECT_MODE_INPUT(base, mask) (*((base)+640) = 0)
#define DIRECT_MODE_OUTPUT(base, mask) (*((base)+640) = 1)
#define DIRECT_WRITE_LOW(base, mask) (*((base)+256) = 1)
#define DIRECT_WRITE_HIGH(base, mask) (*((base)+128) = 1)
#elif defined(__SAM3X8E__)
// Arduino 1.5.1 may have a bug in delayMicroseconds() on Arduino Due.
// http://arduino.cc/forum/index.php/topic,141030.msg1076268.html#msg1076268
// If you have trouble with OneWire on Arduino Due, please check the
// status of delayMicroseconds() before reporting a bug in OneWire!
#define PIN_TO_BASEREG(pin) (&(digitalPinToPort(pin)->PIO_PER))
#define PIN_TO_BITMASK(pin) (digitalPinToBitMask(pin))
#define IO_REG_TYPE uint32_t
#define IO_REG_ASM
#define DIRECT_READ(base, mask) (((*((base)+15)) & (mask)) ? 1 : 0)
#define DIRECT_MODE_INPUT(base, mask) ((*((base)+5)) = (mask))
#define DIRECT_MODE_OUTPUT(base, mask) ((*((base)+4)) = (mask))
#define DIRECT_WRITE_LOW(base, mask) ((*((base)+13)) = (mask))
#define DIRECT_WRITE_HIGH(base, mask) ((*((base)+12)) = (mask))
#ifndef PROGMEM
#define PROGMEM
#endif
#ifndef pgm_read_byte
#define pgm_read_byte(addr) (*(const uint8_t *)(addr))
#endif
#elif defined(__PIC32MX__)
#define PIN_TO_BASEREG(pin) (portModeRegister(digitalPinToPort(pin)))
#define PIN_TO_BITMASK(pin) (digitalPinToBitMask(pin))
#define IO_REG_TYPE uint32_t
#define IO_REG_ASM
#define DIRECT_READ(base, mask) (((*(base+4)) & (mask)) ? 1 : 0) //PORTX + 0x10
#define DIRECT_MODE_INPUT(base, mask) ((*(base+2)) = (mask)) //TRISXSET + 0x08
#define DIRECT_MODE_OUTPUT(base, mask) ((*(base+1)) = (mask)) //TRISXCLR + 0x04
#define DIRECT_WRITE_LOW(base, mask) ((*(base+8+1)) = (mask)) //LATXCLR + 0x24
#define DIRECT_WRITE_HIGH(base, mask) ((*(base+8+2)) = (mask)) //LATXSET + 0x28
#else
#error "Please define I/O register types here"
#endif
class Pin
{
private:
volatile IO_REG_TYPE *reg_;
IO_REG_TYPE mask_;
byte interruptNumber_;
byte pinNumber_;
public:
Pin()
: mask_(0)
, reg_(0)
, interruptNumber_((byte)-1)
, pinNumber_(255)
{ }
Pin(uint8_t pin)
{
pinNumber_ = pin;
mask_ = PIN_TO_BITMASK(pin);
reg_ = PIN_TO_BASEREG(pin);
switch (pin)
{
case 2: interruptNumber_ = 0; break;
case 3: interruptNumber_ = 1; break;
default: interruptNumber_ = (byte)-1;
}
}
inline byte getPinNumber() { return pinNumber_; }
inline void inputMode() { DIRECT_MODE_INPUT(reg_, mask_); }
inline void outputMode() { DIRECT_MODE_OUTPUT(reg_, mask_); }
inline bool read() { return DIRECT_READ(reg_, mask_) == 1; }
inline void writeLow() { DIRECT_WRITE_LOW(reg_, mask_); }
inline void writeHigh() { DIRECT_WRITE_HIGH(reg_, mask_); }
inline void write(bool value) { if (value) writeHigh(); else writeLow(); }
inline void attachInterrupt(void (*handler)(), int mode)
{
CLEARINTERRUPT; // clear any pending interrupt (we want to call the handler only for interrupts happening after it is attached)
::attachInterrupt(interruptNumber_, handler, mode);
}
inline void detachInterrupt() { ::detachInterrupt(interruptNumber_); }
};
#endif