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Added support for attiny85  at 16mhz.

Attiny85 fuses settings and OSCCAL calibration are required to meet the OneWire timing specifications

FakeD2413.ino

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+/*  Ian Fleet 2018
+
+    All files, software, schematics and designs are provided as-is with no warranty.
+    All files, software, schematics and designs are for experimental/hobby use.
+    Under no circumstances should any part be used for critical systems where safety,
+    life or property depends upon it. You are responsible for all use.
+    You are free to use, modify, derive or otherwise extend for your own purposes
+
+*/
+
+
+// This example emulates a DS2413 device on an Arduino UNO or ATTINY85
+// note : physical DS2413 devices found in 2018 are often clones with
+// a device code different to the Maxim datasheet
+
+#include "Arduino.h"
+#include "OneWireSlave.h"
+#include "comptime.h"
+
+// This is the pin that will be used for one-wire data
+// On Arduino Uno, you can use pin 2 or pin 3
+
+Pin oneWireData(2); // PB2 only attiny85 pin with rising/falling interrupts
+
+//Pin led(0);
+
+
+// This sample emulates a DS2413 device , so we start by defining the available commands
+
+const byte DS2413_FAMILY_ID    = 0x3A; // Maxim DS2413 device code
+const byte CLONE_FAMILY_ID     = 0x85; // clone device code
+const byte DS2413_ACCESS_READ  = 0xF5;
+const byte DS2413_ACCESS_WRITE = 0x5A;
+const byte DS2413_ACK_SUCCESS  = 0xAA;
+
+// generate unique id
+const byte owROM[7] = { DS2413_FAMILY_ID, SERIAL_NUMBER};
+// will be calculated in begin:---------------^^^^
+
+// or use fixed id - make sure it doesn't conflict with another device
+//const byte owROM[7] = { 0x3A, 0x00, 0x55, 0xAA, 0x00, 0x11, 0x22 };
+
+
+#define PIOA 3  //  (pin 3)
+#define PIOB 4  //  (pin 4)
+
+uint8_t latch = 0;
+uint8_t statusbyte1 = 0;
+uint8_t statusbyte2 = 0;
+
+enum DeviceState
+{
+  DS_WaitingReset,
+  DS_WaitingCommand,
+  DS_WaitingStatus1,
+  DS_WaitingStatus2,
+};
+volatile DeviceState state = DS_WaitingReset;
+
+// scratchpad
+volatile byte scratchpad[2];
+volatile byte response[2];
+
+
+// This function will be called each time the OneWire library has an event to notify (reset, error, byte received)
+void owReceive(OneWireSlave::ReceiveEvent evt, byte data);
+
+//////////////////////////////////////////
+
+void setup()
+{
+  //  led.outputMode();
+  //  led.writeLow();
+  //  OSCCAL = 85;
+  // Setup the OneWire library
+  OWSlave.setReceiveCallback(&owReceive);
+  OWSlave.begin(owROM, oneWireData.getPinNumber());
+}
+
+//////////////////////////////////////////
+
+void loop()
+{
+  delay(10);
+
+  cli();//disable interrupts
+  // Be sure to not block interrupts for too long, OneWire timing is very tight for some operations. 1 or 2 microseconds (yes, microseconds, not milliseconds) can be too much depending on your master controller, but then it's equally unlikely that you block exactly at the moment where it matters.
+  // This can be mitigated by using error checking and retry in your high-level communication protocol. A good thing to do anyway.
+
+  sei();//enable interrupts
+
+}
+
+//////////////////////////////////////////
+
+static uint8_t getstatus() {
+  uint8_t c = 0;
+  if (latch & 0x01) c |= 0x02;
+  if (digitalRead(PIOA)) c |= 0x01;
+  if (latch & 0x02) c |= 0x08;
+  if (digitalRead(PIOB)) c |= 0x04;
+  uint8_t x = (~c) << 4;
+  return x + c;
+}
+
+//////////////////////////////////////////
+
+static void port(int PIO, bool stat) {
+  if (stat) {
+    digitalWrite(PIO, HIGH);
+    pinMode(PIO, INPUT);
+  } else {
+    pinMode(PIO, OUTPUT);
+    digitalWrite(PIO, LOW);
+  }
+}
+
+
+//////////////////////////////////////////
+
+static void set(uint8_t val) {
+  latch = val;
+  port(PIOA, latch & 1);
+  port(PIOB, latch & 2);
+  //TODO copy latch to EEPROM
+}
+
+//////////////////////////////////////////
+
+void owReceive(OneWireSlave::ReceiveEvent evt, byte data)
+{
+  switch (evt)
+  {
+    case OneWireSlave::RE_Byte:
+      switch (state)
+      {
+        case DS_WaitingCommand:
+          switch (data)
+          {
+            case DS2413_ACCESS_WRITE:
+              state = DS_WaitingStatus1;
+              break;
+
+            case DS2413_ACCESS_READ:
+              state = DS_WaitingReset;
+              scratchpad[0] = getstatus();
+              OWSlave.beginWrite((const byte*)scratchpad, 1, 0);
+
+              break;
+
+              //case :
+
+              // break;
+          }
+          break;
+
+
+        case DS_WaitingStatus1:
+          statusbyte1 = data;
+          state = DS_WaitingStatus2;
+          break;
+
+        case DS_WaitingStatus2:
+          statusbyte2 = data;
+          if (statusbyte1 != ~statusbyte2) {
+            set(statusbyte1);
+            response[0] = DS2413_ACK_SUCCESS;
+          } else  {
+            response[0] = 0x11; // mark error - real DS2413 does not do this
+          }
+          response[1] = getstatus();
+          OWSlave.beginWrite((const byte*)response, 2, 0);
+          state = DS_WaitingCommand;
+          break;
+
+      }
+      break;
+
+    case OneWireSlave::RE_Reset:
+      state = DS_WaitingCommand;
+      break;
+
+    case OneWireSlave::RE_Error:
+      state = DS_WaitingReset;
+      break;
+  }
+}

LowLevel.h

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+#ifndef _LowLevel_h
+#define _LowLevel_h
+
+#include <inttypes.h>
+
+#ifdef VS_INTELLISENSE
+#define __attribute__(...)
+#define digitalPinToPort(pin) 0
+#define digitalPinToBitMask(pin) 0
+#define portInputRegister(arg1) 0
+#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__)
+
+/* Note : The attiny85 clock speed = 16mhz (fuses L 0xF1, H 0xDF. E oxFF
+          OSCCAL VALUE must also be calibrated to 16mhz
+
+*/
+#define CLEARINTERRUPT GIFR |= (1 << INTF0) | (1<<PCIF);
+#define USERTIMER_COMPA_vect TIMER1_COMPA_vect
+
+__attribute__((always_inline)) static inline void UserTimer_Init( void )
+{
+  TCCR1 = 0;                  //stop the timer
+  TCNT1 = 0;
+  //GTCCR |= (1<<PSR1);       //reset the prescaler
+  TIMSK = 0;                  // clear timer interrupts enable
+}
+__attribute__((always_inline)) static inline void UserTimer_Run(int skipTicks)
+{
+
+  TCNT1 = 0;                  //zero the timer
+  GTCCR |= (1 << PSR1);       //reset the prescaler
+  OCR1A = skipTicks;          //set the compare value
+  TCCR1 |= (1 << CTC1) |  (0 << CS13) |  (1 << CS12) | (1 << CS11) | (0 << CS10);//32 prescaler
+  //TCCR1 |= (1 << CTC1) |  (0 << CS13) |  (1 << CS12) | (0 << CS11) | (0 << CS10);//8 prescaler
+  TIMSK |= (1 << OCIE1A);     //interrupt on Compare Match A
+}
+
+__attribute__((always_inline)) static inline void UserTimer_Stop()
+{
+  TIMSK = 0;    //&= ~(1 << OCIE1A);// clear timer interrupt enable
+  TCCR1 = 0;
+}
+
+
+#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;
+  TIMSK1 |= (1 << OCIE1A);  // enable timer compare interrupt
+}
+__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

OneWireSlave.cpp

@@ -0,0 +1,764 @@
+#include "OneWireSlave.h"
+
+// uncomment this line to enable sending messages along with errors (but takes more program memory)
+//#define ERROR_MESSAGES
+
+#ifdef ERROR_MESSAGES
+#define ERROR(msg) error_(msg)
+#else
+#define ERROR(msg) error_(0)
+#endif
+
+namespace
+{
+#if defined (__AVR_ATtiny85__)
+
+const unsigned long ResetMinDuration = 480;      // min 480us  / 484us measured
+const unsigned long ResetMaxDuration = 640;      //
+
+const unsigned long PresenceWaitDuration = 35;   //  spec 15us to 60us  / 40us measured
+
+const unsigned long PresenceDuration = 150;      //   spec  60us to 240us  / 148us measured
+
+const unsigned long ReadBitSamplingTime = 15;    //   spec > 15us to 60us  / 31us measured
+
+// SendBitDuration varies the bus release time to indicate a "1"
+// measured total send bit duration is 63us versus 60us in the spec
+const unsigned long SendBitDuration = 20;   // bus release time spec 15us / measured 19us
+
+
+#elif defined (__AVR_ATmega328P__)
+
+const unsigned long ResetMinDuration = 480;
+const unsigned long ResetMaxDuration = 900;
+
+const unsigned long PresenceWaitDuration = 15;
+
+const unsigned long PresenceDuration = 200;
+
+const unsigned long ReadBitSamplingTime = 25;
+
+const unsigned long SendBitDuration = 35;
+
+#endif
+
+const byte ReceiveCommand = (byte) - 1;
+
+void(*timerEvent)() = 0;
+}
+
+OneWireSlave OWSlave;
+
+byte OneWireSlave::rom_[8];
+byte OneWireSlave::scratchpad_[8];
+Pin OneWireSlave::pin_;
+
+unsigned long OneWireSlave::resetStart_ = 0;;
+unsigned long OneWireSlave::lastReset_ = 0;
+
+void(*OneWireSlave::receiveBitCallback_)(bool bit, bool error);
+void(*OneWireSlave::bitSentCallback_)(bool error);
+void(*OneWireSlave::clientReceiveCallback_)(ReceiveEvent evt, byte data);
+void(*OneWireSlave::clientReceiveBitCallback_)(bool bit);
+
+byte OneWireSlave::receivingByte_;
+
+byte OneWireSlave::searchRomBytePos_;
+byte OneWireSlave::searchRomBitPos_;
+bool OneWireSlave::searchRomInverse_;
+bool OneWireSlave::resumeCommandFlag_;
+bool OneWireSlave::alarmedFlag_;
+
+const byte* OneWireSlave::sendBuffer_;
+byte* OneWireSlave::recvBuffer_;
+short OneWireSlave::bufferLength_;
+byte OneWireSlave::bufferBitPos_;
+short OneWireSlave::bufferPos_;
+void(*OneWireSlave::receiveBytesCallback_)(bool error);
+void(*OneWireSlave::sendBytesCallback_)(bool error);
+
+volatile bool OneWireSlave::waitingSynchronousWriteToComplete_;
+volatile bool OneWireSlave::synchronousWriteError_;
+
+bool OneWireSlave::sendingClientBytes_;
+
+bool OneWireSlave::singleBit_;
+bool OneWireSlave::singleBitRepeat_;
+void(*OneWireSlave::singleBitSentCallback_)(bool error);
+
+void(*OneWireSlave::logCallback_)(const char* message);
+
+
+ISR(USERTIMER_COMPA_vect) // timer1 interrupt
+{
+  UserTimer_Stop(); // disable clock
+  void(*event)() = timerEvent;
+  timerEvent = 0;
+  event();
+}
+
+void OneWireSlave::begin(const byte* rom, byte pinNumber)
+{
+  pin_ = Pin(pinNumber);
+  resetStart_ = (unsigned long) - 1;
+  lastReset_ = 0;
+
+  memcpy(rom_, rom, 7);
+  rom_[7] = crc8(rom_, 7);
+
+  resumeCommandFlag_ = false;
+  alarmedFlag_       = false;
+
+  clientReceiveBitCallback_ = 0;
+  sendingClientBytes_ = false;
+
+  // log("Enabling 1-wire library")
+
+  cli(); // disable interrupts
+  pin_.inputMode();
+  pin_.writeLow(); // make sure the internal pull-up resistor is disabled
+
+  // prepare hardware timer
+  UserTimer_Init();
+
+  // start 1-wire activity
+  beginWaitReset_();
+  sei(); // enable interrupts
+}
+
+void OneWireSlave::end()
+{
+  // log("Disabling 1-wire library");
+
+  cli();
+  disableTimer_();
+  pin_.detachInterrupt();
+  releaseBus_();
+  sei();
+}
+
+bool OneWireSlave::write(const byte* bytes, short numBytes)
+{
+  // TODO: put the arduino to sleep between interrupts to save power?
+  waitingSynchronousWriteToComplete_ = true;
+  beginWrite(bytes, numBytes, &OneWireSlave::onSynchronousWriteComplete_);
+  while (waitingSynchronousWriteToComplete_)
+    delay(1);
+  return !synchronousWriteError_;
+}
+
+void OneWireSlave::onSynchronousWriteComplete_(bool error)
+{
+  synchronousWriteError_ = error;
+  waitingSynchronousWriteToComplete_ = false;
+}
+
+void OneWireSlave::beginWrite(const byte* bytes, short numBytes, void(*complete)(bool error))
+{
+  cli();
+  endWrite_(true);
+  sendingClientBytes_ = true;
+  beginWriteBytes_(bytes, numBytes, complete == 0 ? noOpCallback_ : complete);
+  sei();
+}
+
+void OneWireSlave::endWrite_(bool error, bool resetInterrupts)
+{
+  if (resetInterrupts)
+    beginWaitReset_();
+
+  if (sendingClientBytes_)
+  {
+    sendingClientBytes_ = false;
+    if (sendBytesCallback_ != 0)
+    {
+      void(*callback)(bool error) = sendBytesCallback_;
+      sendBytesCallback_ = noOpCallback_;
+      callback(error);
+    }
+  }
+  else if (singleBitSentCallback_ != 0)
+  {
+    void(*callback)(bool) = singleBitSentCallback_;
+    singleBitSentCallback_ = 0;
+    callback(error);
+  }
+}
+
+bool OneWireSlave::writeBit(bool value)
+{
+  // TODO: put the arduino to sleep between interrupts to save power?
+  waitingSynchronousWriteToComplete_ = true;
+  beginWriteBit(value, false, &OneWireSlave::onSynchronousWriteComplete_);
+  while (waitingSynchronousWriteToComplete_)
+    delay(1);
+  return !synchronousWriteError_;
+}
+
+void OneWireSlave::beginWriteBit(bool value, bool repeat, void(*bitSent)(bool))
+{
+  cli();
+  endWrite_(true);
+
+  singleBit_ = value;
+  singleBitRepeat_ = repeat;
+  singleBitSentCallback_ = bitSent;
+  beginSendBit_(value, &OneWireSlave::onSingleBitSent_);
+  sei();
+}
+
+void OneWireSlave::onSingleBitSent_(bool error)
+{
+  if (!error && singleBitRepeat_)
+  {
+    beginSendBit_(singleBit_, &OneWireSlave::onSingleBitSent_);
+  }
+  else
+  {
+    beginReceiveBytes_(scratchpad_, 1, &OneWireSlave::notifyClientByteReceived_);
+  }
+
+  if (singleBitSentCallback_ != 0)
+  {
+    void(*callback)(bool) = singleBitSentCallback_;
+    singleBitSentCallback_ = 0;
+    callback(error);
+  }
+}
+
+void OneWireSlave::stopWrite()
+{
+  beginWrite(0, 0, 0);
+}
+
+void OneWireSlave::alarmed(bool value)
+{
+  alarmedFlag_ = value;
+}
+
+byte OneWireSlave::crc8(const byte* data, short numBytes)
+{
+  byte crc = 0;
+
+  while (numBytes--) {
+    byte inbyte = *data++;
+    for (byte i = 8; i; i--) {
+      byte mix = (crc ^ inbyte) & 0x01;
+      crc >>= 1;
+      if (mix) crc ^= 0x8C;
+      inbyte >>= 1;
+    }
+  }
+  return crc;
+}
+
+#if defined (__AVR_ATtiny85__)
+
+void OneWireSlave::setTimerEvent_(short delayMicroSeconds, void(*handler)())
+{
+  delayMicroSeconds -= 8; // remove overhead (tuned on attiny85, values 0 - 10 work ok)
+
+  short skipTicks = delayMicroSeconds / 2; // 16mhz clock, prescaler = 32
+  if (skipTicks < 1) skipTicks = 1;
+  timerEvent = handler;
+  UserTimer_Run(skipTicks);
+}
+
+#elif defined (__AVR_ATmega328P__)
+
+void OneWireSlave::setTimerEvent_(short delayMicroSeconds, void(*handler)())
+{
+  delayMicroSeconds -= 10; // remove overhead (tuned on Arduino Uno)
+
+  // prescaler 64
+  short skipTicks = (delayMicroSeconds - 3) / 4; // round the micro seconds delay to a number of ticks to skip (4us per tick, so 4us must skip 0 tick, 8us must skip 1 tick, etc.)
+  if (skipTicks < 1) skipTicks = 1;
+  timerEvent = handler;
+  UserTimer_Run(skipTicks);
+}
+
+#endif
+
+void OneWireSlave::disableTimer_()
+{
+  UserTimer_Stop();
+}
+
+void OneWireSlave::onEnterInterrupt_()
+{
+}
+
+void OneWireSlave::onLeaveInterrupt_()
+{
+}
+
+void OneWireSlave::error_(const char* message)
+{
+  if (logCallback_ != 0)
+    logCallback_(message);
+  endWrite_(true);
+  if (clientReceiveCallback_ != 0)
+    clientReceiveCallback_(RE_Error, 0);
+}
+
+void OneWireSlave::pullLow_()
+{
+  pin_.outputMode();
+  pin_.writeLow();
+}
+
+void OneWireSlave::releaseBus_()
+{
+  pin_.inputMode();
+}
+
+void OneWireSlave::beginResetDetection_()
+{
+  setTimerEvent_(ResetMinDuration - 50, &OneWireSlave::resetCheck_);
+  resetStart_ = micros() - 50;
+}
+
+void OneWireSlave::beginResetDetectionSendZero_()
+{
+  setTimerEvent_(ResetMinDuration - SendBitDuration - 50, &OneWireSlave::resetCheck_);
+  resetStart_ = micros() - SendBitDuration - 50;
+}
+
+void OneWireSlave::cancelResetDetection_()
+{
+  disableTimer_();
+  resetStart_ = (unsigned long) - 1;
+}
+
+void OneWireSlave::resetCheck_()
+{
+  onEnterInterrupt_();
+  if (!pin_.read())
+  {
+    pin_.attachInterrupt(&OneWireSlave::waitReset_, CHANGE);
+    // log("Reset detected during another operation");
+  }
+  onLeaveInterrupt_();
+}
+
+void OneWireSlave::beginReceiveBit_(void(*completeCallback)(bool bit, bool error))
+{
+  receiveBitCallback_ = completeCallback;
+  pin_.attachInterrupt(&OneWireSlave::receive_, FALLING);
+}
+
+void OneWireSlave::receive_()
+{
+  onEnterInterrupt_();
+
+  pin_.detachInterrupt();
+  setTimerEvent_(ReadBitSamplingTime, &OneWireSlave::readBit_);
+
+  onLeaveInterrupt_();
+}
+
+void OneWireSlave::readBit_()
+{
+  onEnterInterrupt_();
+
+  bool bit = pin_.read();
+  if (bit)
+    cancelResetDetection_();
+  else
+    beginResetDetection_();
+  receiveBitCallback_(bit, false);
+  //dbgOutput.writeLow();
+  //dbgOutput.writeHigh();
+
+  onLeaveInterrupt_();
+}
+
+void OneWireSlave::beginSendBit_(bool bit, void(*completeCallback)(bool error))
+{
+  bitSentCallback_ = completeCallback;
+  if (bit)
+  {
+    pin_.attachInterrupt(&OneWireSlave::sendBitOne_, FALLING);
+  }
+  else
+  {
+    pin_.attachInterrupt(&OneWireSlave::sendBitZero_, FALLING);
+  }
+}
+
+void OneWireSlave::sendBitOne_()
+{
+  onEnterInterrupt_();
+
+  beginResetDetection_();
+  bitSentCallback_(false);
+
+  onLeaveInterrupt_();
+}
+
+void OneWireSlave::sendBitZero_()
+{
+  pullLow_(); // this must be executed first because the timing is very tight with some master devices
+
+  onEnterInterrupt_();
+
+  pin_.detachInterrupt();
+  setTimerEvent_(SendBitDuration, &OneWireSlave::endSendBitZero_);
+
+  onLeaveInterrupt_();
+}
+
+void OneWireSlave::endSendBitZero_()
+{
+  onEnterInterrupt_();
+
+  releaseBus_();
+  beginResetDetectionSendZero_();
+  bitSentCallback_(false);
+
+  onLeaveInterrupt_();
+}
+
+void OneWireSlave::beginWaitReset_()
+{
+  disableTimer_();
+  pin_.inputMode();
+  pin_.attachInterrupt(&OneWireSlave::waitReset_, CHANGE);
+  //resetStart_ = (unsigned int) - 1;
+  resetStart_ = (unsigned long) - 1;
+}
+
+
+void OneWireSlave::waitReset_()
+{
+  onEnterInterrupt_();
+  bool state = pin_.read();
+  unsigned long now = micros();
+  if (state)
+  {
+    if (resetStart_ == (unsigned long) - 1)
+    {
+      onLeaveInterrupt_();
+      return;
+    }
+    static unsigned long resetDuration = now - resetStart_;
+    //resetStart_ = (unsigned int) - 1;
+    resetStart_ = (unsigned long) - 1;
+    if (resetDuration >= ResetMinDuration)
+    {
+
+     // The following test has been removed because of a bug which causes the value of 
+     // resetduration to exceed ResetMaxDuration intermittently. This happens
+     // only on the attiny platform - possibly due to the implementation of
+     // micros() in the attiny core 
+     
+     // if (resetDuration > ResetMaxDuration)
+     // {
+     //  ERROR("Reset too long");
+     //   onLeaveInterrupt_();
+     //   return;
+     // }
+
+      lastReset_ = now;
+      pin_.detachInterrupt();
+      unsigned long alreadyElapsedTime = micros() - now;
+      setTimerEvent_(alreadyElapsedTime < PresenceWaitDuration ? PresenceWaitDuration - alreadyElapsedTime : 0, &OneWireSlave::beginPresence_);
+      endWrite_(true, false);
+      if (clientReceiveCallback_ != 0)
+        clientReceiveCallback_(RE_Reset, 0);
+    } else
+    {
+      //ERROR("Reset too short");
+    }
+  }
+  else
+  {
+    resetStart_ = now;
+  }
+  onLeaveInterrupt_();
+}
+
+void OneWireSlave::beginPresence_()
+{
+  pullLow_();
+  setTimerEvent_(PresenceDuration, &OneWireSlave::endPresence_);
+}
+
+void OneWireSlave::endPresence_()
+{
+  releaseBus_();
+
+  beginWaitCommand_();
+}
+
+void OneWireSlave::beginWaitCommand_()
+{
+  bufferPos_ = ReceiveCommand;
+  beginReceive_();
+}
+
+void OneWireSlave::beginReceive_()
+{
+  receivingByte_ = 0;
+  bufferBitPos_ = 0;
+  beginReceiveBit_(&OneWireSlave::onBitReceived_);
+}
+
+void OneWireSlave::onBitReceived_(bool bit, bool error)
+{
+  if (error)
+  {
+    ERROR("Invalid bit");
+    if (bufferPos_ >= 0)
+      receiveBytesCallback_(true);
+    return;
+  }
+
+   receivingByte_ |= ((bit ? 1 : 0) << bufferBitPos_);
+  ++bufferBitPos_;
+
+  if (clientReceiveBitCallback_ != 0 && bufferPos_ != ReceiveCommand)
+    clientReceiveBitCallback_(bit);
+
+  if (bufferBitPos_ == 8)
+  {
+    // log("received byte", (long)receivingByte_);
+
+    if (bufferPos_ == ReceiveCommand)
+    {
+      bufferPos_ = 0;
+      switch (receivingByte_)
+      {
+        case 0xF0: // SEARCH ROM
+          resumeCommandFlag_ = false;
+          beginSearchRom_();
+          return;
+        case 0xEC: // CONDITIONAL SEARCH ROM
+          resumeCommandFlag_ = false;
+          if (alarmedFlag_)
+          {
+            beginSearchRom_();
+          }
+          else
+          {
+            beginWaitReset_();
+          }
+          return;
+        case 0x33: // READ ROM
+          resumeCommandFlag_ = false;
+          beginWriteBytes_(rom_, 8, &OneWireSlave::noOpCallback_);
+          return;
+        case 0x55: // MATCH ROM
+          resumeCommandFlag_ = false;
+          beginReceiveBytes_(scratchpad_, 8, &OneWireSlave::matchRomBytesReceived_);
+          return;
+        case 0xCC: // SKIP ROM
+          resumeCommandFlag_ = false;
+          beginReceiveBytes_(scratchpad_, 1, &OneWireSlave::notifyClientByteReceived_);
+          return;
+        case 0xA5: // RESUME
+          if (resumeCommandFlag_)
+          {
+            beginReceiveBytes_(scratchpad_, 1, &OneWireSlave::notifyClientByteReceived_);
+          }
+          else
+          {
+            beginWaitReset_();
+          }
+          return;
+        default:
+          ERROR("Unknown command");
+          return;
+      }
+    }
+    else
+    {
+      recvBuffer_[bufferPos_++] = receivingByte_;
+      receivingByte_ = 0;
+      bufferBitPos_ = 0;
+      if (bufferPos_ == bufferLength_)
+      {
+        beginWaitReset_();
+        receiveBytesCallback_(false);
+        return;
+      }
+    }
+  }
+
+  beginReceiveBit_(&OneWireSlave::onBitReceived_);
+}
+
+void OneWireSlave::beginSearchRom_()
+{
+  searchRomBytePos_ = 0;
+  searchRomBitPos_ = 0;
+  searchRomInverse_ = false;
+
+  beginSearchRomSendBit_();
+}
+
+void OneWireSlave::beginSearchRomSendBit_()
+{
+  byte currentByte = rom_[searchRomBytePos_];
+  bool currentBit = bitRead(currentByte, searchRomBitPos_);
+  bool bitToSend = searchRomInverse_ ? !currentBit : currentBit;
+
+  beginSendBit_(bitToSend, &OneWireSlave::continueSearchRom_);
+}
+
+void OneWireSlave::continueSearchRom_(bool error)
+{
+  if (error)
+  {
+    ERROR("Failed to send bit");
+    return;
+  }
+
+  searchRomInverse_ = !searchRomInverse_;
+  if (searchRomInverse_)
+  {
+    beginSearchRomSendBit_();
+  }
+  else
+  {
+    beginReceiveBit_(&OneWireSlave::searchRomOnBitReceived_);
+  }
+}
+
+void OneWireSlave::searchRomOnBitReceived_(bool bit, bool error)
+{
+  if (error)
+  {
+    ERROR("Bit read error during ROM search");
+    return;
+  }
+
+  byte currentByte = rom_[searchRomBytePos_];
+  bool currentBit = bitRead(currentByte, searchRomBitPos_);
+
+  if (bit == currentBit)
+  {
+    ++searchRomBitPos_;
+    if (searchRomBitPos_ == 8)
+    {
+      searchRomBitPos_ = 0;
+      ++searchRomBytePos_;
+    }
+
+    if (searchRomBytePos_ == 8)
+    {
+      // log("ROM sent entirely");
+
+      beginWaitReset_();
+    }
+    else
+    {
+      beginSearchRomSendBit_();
+    }
+  }
+  else
+  {
+    // log("Leaving ROM search");
+    beginWaitReset_();
+  }
+}
+
+void OneWireSlave::beginWriteBytes_(const byte * data, short numBytes, void(*complete)(bool error))
+{
+  sendBuffer_ = data;
+  bufferLength_ = numBytes;
+  bufferPos_ = 0;
+  bufferBitPos_ = 0;
+  sendBytesCallback_ = complete;
+
+  if (sendBuffer_ != 0 && bufferLength_ > 0)
+  {
+    bool bit = bitRead(sendBuffer_[0], 0);
+    beginSendBit_(bit, &OneWireSlave::bitSent_);
+  }
+  else
+  {
+    endWrite_(true);
+    beginReceiveBytes_(scratchpad_, 1, &OneWireSlave::notifyClientByteReceived_);
+  }
+}
+
+void OneWireSlave::bitSent_(bool error)
+{
+  if (error)
+  {
+    ERROR("error sending a bit");
+    sendBytesCallback_(true);
+    return;
+  }
+
+  ++bufferBitPos_;
+  if (bufferBitPos_ == 8)
+  {
+    bufferBitPos_ = 0;
+    ++bufferPos_;
+  }
+
+  if (bufferPos_ == bufferLength_)
+  {
+    endWrite_(false);
+    sendBytesCallback_(false);
+    return;
+  }
+
+  bool bit = bitRead(sendBuffer_[bufferPos_], bufferBitPos_);
+  beginSendBit_(bit, &OneWireSlave::bitSent_);
+}
+
+void OneWireSlave::beginReceiveBytes_(byte * buffer, short numBytes, void(*complete)(bool error))
+{
+  recvBuffer_ = buffer;
+  bufferLength_ = numBytes;
+  bufferPos_ = 0;
+  receiveBytesCallback_ = complete;
+  beginReceive_();
+}
+
+void OneWireSlave::noOpCallback_(bool error)
+{
+  if (error)
+    ERROR("error during an internal 1-wire operation");
+}
+
+void OneWireSlave::matchRomBytesReceived_(bool error)
+{
+  if (error)
+  {
+    resumeCommandFlag_ = false;
+    ERROR("error receiving match rom bytes");
+    return;
+  }
+
+  if (memcmp(rom_, scratchpad_, 8) == 0)
+  {
+    // log("ROM matched");
+    resumeCommandFlag_ = true;
+    beginReceiveBytes_(scratchpad_, 1, &OneWireSlave::notifyClientByteReceived_);
+  }
+  else
+  {
+    // log("ROM not matched");
+    resumeCommandFlag_ = false;
+    beginWaitReset_();
+  }
+}
+
+void OneWireSlave::notifyClientByteReceived_(bool error)
+{
+  if (error)
+  {
+    if (clientReceiveCallback_ != 0)
+      clientReceiveCallback_(RE_Error, 0);
+    ERROR("error receiving custom bytes");
+    return;
+  }
+
+  beginReceiveBytes_(scratchpad_, 1, &OneWireSlave::notifyClientByteReceived_);
+  if (clientReceiveCallback_ != 0)
+    clientReceiveCallback_(RE_Byte, scratchpad_[0]);
+}

OneWireSlave.h

@@ -0,0 +1,154 @@
+#ifndef _OneWireSlave_h_
+#define _OneWireSlave_h_
+
+#include "Arduino.h"
+#include "LowLevel.h"
+
+class OneWireSlave
+{
+  public:
+    enum ReceiveEvent
+    {
+      RE_Reset, //!< The master has sent a general reset
+      RE_Byte, //!< The master just sent a byte of data
+      RE_Error //!< A communication error happened (such as a timeout) ; the library will stop all 1-wire activities until the next reset
+    };
+
+    //! Starts listening for the 1-wire master, on the specified pin, as a virtual slave device identified by the specified ROM (7 bytes, starting from the family code, CRC will be computed internally). Reset, Presence, SearchRom and MatchRom are handled automatically. The library will use the external interrupt on the specified pin (note that this is usually not possible with all pins, depending on the board), as well as one hardware timer. Blocking interrupts (either by disabling them explicitely with sei/cli, or by spending time in another interrupt) can lead to malfunction of the library, due to tight timing for some 1-wire operations.
+    void begin(const byte* rom, byte pinNumber);
+
+    //! Stops all 1-wire activities, which frees hardware resources for other purposes.
+    void end();
+
+    //! Sets (or replaces) a function to be called when something is received. The callback is executed from interrupts and should be as short as possible. Failure to return quickly can prevent the library from correctly reading the next byte.
+    void setReceiveCallback(void(*callback)(ReceiveEvent evt, byte data)) {
+      clientReceiveCallback_ = callback;
+    }
+
+    //! Sets (or replaces) a function to be called when a bit is received. The byte reception callback is called after that if the received bit was the last of a byte. The callback is executed from interrupts and should be as short as possible. Failure to return quickly can prevent the library from correctly reading the next bit.
+    void setReceiveBitCallback(void(*callback)(bool bit)) {
+      clientReceiveBitCallback_ = callback;
+    }
+
+    //! Sets (or replaces) a function to be called when the library has a message to log, if the functionality is enabled in OneWireSlave.cpp. This is for debugging purposes.
+    void setLogCallback(void(*callback)(const char* message)) {
+      logCallback_ = callback;
+    }
+
+    //! Writes the specified bytes synchronously. This function blocks until the write operation has finished. Do not call from an interrupt handler! Returns true in case of success, false if an error occurs.
+    bool write(const byte* bytes, short numBytes);
+
+    //! Starts sending the specified bytes. They will be sent in the background, and the buffer must remain valid and unchanged until the write operation has finished or is cancelled. The optional callback is used to notify when the bytes are sent, or if an error occured. Callbacks are executed from interrupts and should be as short as possible. If bytes is null or numBytes is 0, nothing is sent, which is equivalent to calling stopWrite. In any case, calling the write function will cancel the previous write operation if it didn't complete yet.
+    void beginWrite(const byte* bytes, short numBytes, void(*complete)(bool error));
+
+    //! Writes a single bit synchronously. This function blocks until the bit is sent. Do not call from an interrupt handler! Returns true in case of success, false if an error occurs.
+    bool writeBit(bool value);
+
+    //! Sets a bit that will be sent next time the master asks for one. Optionnaly, the repeat parameter can be set to true to continue sending the same bit each time. In both cases, the send operation can be canceled by calling stopWrite.
+    void beginWriteBit(bool value, bool repeat = false, void(*bitSent)(bool error) = 0);
+
+    //! Cancels any pending write operation, started by writeBit or write. If this function is called before the master asked for a bit, then nothing is sent to the master.
+    void stopWrite();
+
+    //! Sets the alarmed state, that is used when the master makes a conditional search of alarmed devices.
+    void alarmed(bool value);
+
+    static byte crc8(const byte* data, short numBytes);
+
+  private:
+    static void setTimerEvent_(short delayMicroSeconds, void(*handler)());
+    static void disableTimer_();
+
+    static void onEnterInterrupt_();
+    static void onLeaveInterrupt_();
+
+    static void error_(const char* message);
+
+    static void pullLow_();
+    static void releaseBus_();
+
+    static void beginReceiveBit_(void(*completeCallback)(bool bit, bool error));
+    static void beginSendBit_(bool bit, void(*completeCallback)(bool error));
+
+    static void beginResetDetection_();
+    static void beginResetDetectionSendZero_();
+    static void cancelResetDetection_();
+
+    static void beginWaitReset_();
+    static void beginWaitCommand_();
+    static void beginReceive_();
+    static void onBitReceived_(bool bit, bool error);
+
+    static void beginSearchRom_();
+    static void beginSearchRomSendBit_();
+    static void continueSearchRom_(bool error);
+    static void searchRomOnBitReceived_(bool bit, bool error);
+
+    static void beginWriteBytes_(const byte* data, short numBytes, void(*complete)(bool error));
+    static void beginReceiveBytes_(byte* buffer, short numBytes, void(*complete)(bool error));
+
+    static void endWrite_(bool error, bool resetInterrupts = true);
+
+    static void onSynchronousWriteComplete_(bool error);
+    static void noOpCallback_(bool error);
+    static void matchRomBytesReceived_(bool error);
+    static void notifyClientByteReceived_(bool error);
+    static void bitSent_(bool error);
+
+    // interrupt handlers
+    static void waitReset_();
+    static void beginPresence_();
+    static void endPresence_();
+    static void receive_();
+    static void readBit_();
+    static void sendBitOne_();
+    static void sendBitZero_();
+    static void endSendBitZero_();
+    static void resetCheck_();
+
+  private:
+    static byte rom_[8];
+    static byte scratchpad_[8];
+    static Pin pin_;
+
+    static unsigned long resetStart_;
+    static unsigned long lastReset_;
+
+    static void(*receiveBitCallback_)(bool bit, bool error);
+    static void(*bitSentCallback_)(bool error);
+
+    static byte receivingByte_;
+
+    static byte searchRomBytePos_;
+    static byte searchRomBitPos_;
+    static bool searchRomInverse_;
+    static bool resumeCommandFlag_;
+    static bool alarmedFlag_;
+
+    static const byte* sendBuffer_;
+    static byte* recvBuffer_;
+    static short bufferLength_;
+    static short bufferPos_;
+    static byte bufferBitPos_;
+    static void(*receiveBytesCallback_)(bool error);
+    static void(*sendBytesCallback_)(bool error);
+
+    static volatile bool waitingSynchronousWriteToComplete_;
+    static volatile bool synchronousWriteError_;
+
+    static bool sendingClientBytes_;
+
+    static bool singleBit_;
+    static bool singleBitRepeat_;
+    static void (*singleBitSentCallback_)(bool error);
+    static void onSingleBitSent_(bool error);
+
+    static void(*clientReceiveCallback_)(ReceiveEvent evt, byte data);
+    static void(*clientReceiveBitCallback_)(bool bit);
+
+    static void(*logCallback_)(const char* message);
+};
+
+extern OneWireSlave OWSlave;
+
+#endif

README.md

@@ -1,8 +1,8 @@
 # OneWireArduinoSlave
 An arduino library to communicate using the Dallas one-wire protocol, where the Arduino takes the role of a slave. Entirely implemented using interrupts, you can perform other tasks while communication is handled in background.
 
-## 1-wire introduction
-1-wire allows communication over long distances (100m and more, see Dallas documentation for details) with a single wire (plus a ground wire). You can put as much devices as you want on the same wire (they communicate one at a time). 1-wire also allows to send power over the data wire (parasitic power), but, though I haven't tried, I don't believe it would work with an Arduino. You'll need a separate 5V power source, which, if it comes next to your data wire, means you need 3 wires (5V, data, and ground). You'll also need a master controller, for example the USB adapter DS9490R, to connect to a computer, that will control communication with all 1-wire devices.
+Notes
 
-## How to use this library
-Take a look at [the documentation of the library](extras/documentation.md)
+Added support for the attiny85 platform at 16mhz
+
+Included a OneWireSlave implementation of a DS2413 (FakeDS2413) for both the ATMEGA328 and ATTINY85 platforms

comptime.h

@@ -0,0 +1,21 @@
+// copied - source unknown
+
+#define YY (((__DATE__[9]-'0')*16 + __DATE__[10])-'0')
+#define MMM (\
+             __DATE__ [2] == '?' ? 1 \
+             : __DATE__ [2] == 'n' ? (__DATE__ [1] == 'a' ? 1 : 6) \
+             : __DATE__ [2] == 'b' ? 2 \
+             : __DATE__ [2] == 'r' ? (__DATE__ [0] == 'M' ? 3 : 4) \
+             : __DATE__ [2] == 'y' ? 5 \
+             : __DATE__ [2] == 'l' ? 7 \
+             : __DATE__ [2] == 'g' ? 8 \
+             : __DATE__ [2] == 'p' ? 9 \
+             : __DATE__ [2] == 't' ? 16 \
+             : __DATE__ [2] == 'v' ? 17 \
+             : 18)
+#define DD ( __DATE__[4] == '?' ? 1 : ((__DATE__[4] == ' ' ? 0 : ((__DATE__[4] - '0') * 16)) + __DATE__[5] - '0'))
+#define TT (((__TIME__[0] - '0') * 16) + __TIME__[1] - '0')
+#define MM (((__TIME__[3] - '0') * 16) + __TIME__[4] - '0')
+#define SS (((__TIME__[6] - '0') * 16) + __TIME__[7] - '0')
+
+#define SERIAL_NUMBER YY, MMM, DD, TT, MM, SS