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добавление mysensors в процессе не рабочая версия
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Dmitry Borisenko
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/* Arduino DigitalIO Library
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* Copyright (C) 2013 by William Greiman
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*
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* This file is part of the Arduino DigitalIO Library
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*
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* This Library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with the Arduino DigitalIO Library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#if defined(__AVR__) || defined(DOXYGEN) // AVR only
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/**
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* @file
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* @brief AVR Software I2C library
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*
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* @defgroup softI2C Software I2C
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* @details Software Two Wire Interface library.
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* @{
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*/
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#include "SoftI2cMaster.h"
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//------------------------------------------------------------------------------
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/**
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* Start an I2C transfer with possible continuation.
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*
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* @param[in] addrRW I2C slave address plus R/W bit.
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* The I2C slave address is in the high seven bits
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* and is ORed with on of the following:
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* - I2C_READ for a read transfer.
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* - I2C_WRITE for a write transfer.
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* .
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* @param[in,out] buf Source or destination for transfer.
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* @param[in] nbytes Number of bytes to transfer (may be zero).
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* @param[in] option Option for ending the transfer, one of:
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* - I2C_STOP end the transfer with an I2C stop
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* condition.
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* - I2C_REP_START end the transfer with an I2C
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* repeated start condition.
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* - I2C_CONTINUE allow additional transferContinue()
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* calls.
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* .
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* @return true for success else false.
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*/
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bool I2cMasterBase::transfer(uint8_t addrRW,
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void *buf, size_t nbytes, uint8_t option)
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{
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if (_state != STATE_REP_START) {
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start();
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}
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if (!write(addrRW)) {
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_state = (addrRW & I2C_READ) ? STATE_RX_ADDR_NACK : STATE_TX_ADDR_NACK;
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return false;
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}
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_state = (addrRW & I2C_READ) ? STATE_RX_DATA : STATE_TX_DATA;
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return transferContinue(buf, nbytes, option);
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}
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//------------------------------------------------------------------------------
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/**
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* Continue an I2C transfer.
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*
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* @param[in,out] buf Source or destination for transfer.
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* @param[in] nbytes Number of bytes to transfer (may be zero).
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* @param[in] option Option for ending the transfer, one of:
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* - I2C_STOP end the transfer with an I2C stop
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* condition.
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* - I2C_REP_START end the transfer with an I2C
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* repeated start condition.
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* - I2C_CONTINUE allow additional transferContinue()
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* calls.
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* .
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* @return true for success else false.
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*/
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bool I2cMasterBase::transferContinue(void *buf, size_t nbytes, uint8_t option)
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{
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uint8_t* p = reinterpret_cast<uint8_t*>(buf);
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if (_state == STATE_RX_DATA) {
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for (size_t i = 0; i < nbytes; i++) {
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p[i] = read(i == (nbytes - 1) && option != I2C_CONTINUE);
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}
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} else if (_state == STATE_TX_DATA) {
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for (size_t i = 0; i < nbytes; i++) {
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if (!write(p[i])) {
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_state = STATE_TX_DATA_NACK;
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return false;
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}
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}
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} else {
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return false;
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}
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if (option == I2C_STOP) {
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stop();
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_state = STATE_STOP;
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} else if (option == I2C_REP_START) {
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start();
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_state = STATE_STOP;
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}
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return true;
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}
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//==============================================================================
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// WARNING don't change SoftI2cMaster unless you verify the change with a scope
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//------------------------------------------------------------------------------
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/**
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* Constructor, initialize SCL/SDA pins and set the bus high.
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*
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* @param[in] sdaPin The software SDA pin number.
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*
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* @param[in] sclPin The software SCL pin number.
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*/
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SoftI2cMaster::SoftI2cMaster(uint8_t sclPin, uint8_t sdaPin)
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{
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begin(sclPin, sdaPin);
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}
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//------------------------------------------------------------------------------
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/**
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* Initialize SCL/SDA pins and set the bus high.
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*
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* @param[in] sdaPin The software SDA pin number.
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*
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* @param[in] sclPin The software SCL pin number.
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*/
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void SoftI2cMaster::begin(uint8_t sclPin, uint8_t sdaPin)
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{
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uint8_t port;
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// Get bit mask and address of scl registers.
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_sclBit = digitalPinToBitMask(sclPin);
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port = digitalPinToPort(sclPin);
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_sclDDR = portModeRegister(port);
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volatile uint8_t* sclOutReg = portOutputRegister(port);
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// Get bit mask and address of sda registers.
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_sdaBit = digitalPinToBitMask(sdaPin);
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port = digitalPinToPort(sdaPin);
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_sdaDDR = portModeRegister(port);
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_sdaInReg = portInputRegister(port);
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volatile uint8_t* sdaOutReg = portOutputRegister(port);
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// Clear PORT bit for scl and sda.
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uint8_t s = SREG;
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noInterrupts();
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*sclOutReg &= ~_sclBit;
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*sdaOutReg &= ~_sdaBit;
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SREG = s;
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// Set scl and sda high.
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writeScl(HIGH);
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writeSda(HIGH);
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}
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//------------------------------------------------------------------------------
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/* Read a byte and send ACK if more reads follow else NACK to terminate read.
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*
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* @param[in] last Set true to terminate the read else false.
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*
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* @return The byte read from the I2C bus.
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*/
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uint8_t SoftI2cMaster::read(uint8_t last)
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{
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uint8_t b = 0;
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// Set sda to high Z mode for read.
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writeSda(HIGH);
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// Read a byte.
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for (uint8_t i = 0; i < 8; i++) {
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// Don't change this loop unless you verify the change with a scope.
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b <<= 1;
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sclDelay(16);
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writeScl(HIGH);
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sclDelay(12);
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if (readSda()) {
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b |= 1;
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}
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writeScl(LOW);
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}
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// send ACK or NACK
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writeSda(last);
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sclDelay(12);
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writeScl(HIGH);
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sclDelay(18);
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writeScl(LOW);
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writeSda(LOW);
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return b;
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}
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//------------------------------------------------------------------------------
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/* Issue a start condition. */
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void SoftI2cMaster::start()
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{
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if (!readSda()) {
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writeSda(HIGH);
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writeScl(HIGH);
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sclDelay(20);
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}
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writeSda(LOW);
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sclDelay(20);
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writeScl(LOW);
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}
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//------------------------------------------------------------------------------
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/* Issue a stop condition. */
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void SoftI2cMaster::stop(void)
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{
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writeSda(LOW);
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sclDelay(20);
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writeScl(HIGH);
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sclDelay(20);
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writeSda(HIGH);
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sclDelay(20);
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}
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//------------------------------------------------------------------------------
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/*
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* Write a byte.
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*
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* @param[in] data The byte to send.
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*
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* @return The value true, 1, if the slave returned an ACK or false for NACK.
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*/
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bool SoftI2cMaster::write(uint8_t data)
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{
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// write byte
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for (uint8_t m = 0X80; m != 0; m >>= 1) {
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// don't change this loop unless you verify the change with a scope
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writeSda(m & data);
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sclDelay(8);
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writeScl(HIGH);
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sclDelay(18);
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writeScl(LOW);
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}
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sclDelay(8);
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// Go to sda high Z mode for input.
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writeSda(HIGH);
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writeScl(HIGH);
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sclDelay(16);
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// Get ACK or NACK.
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uint8_t rtn = readSda();
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// pull scl low.
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writeScl(LOW);
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// Pull sda low.
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writeSda(LOW);
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return rtn == 0;
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}
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#endif // __AVR__
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/** @} */
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