Initial Commit
This commit is contained in:
TrippyLighting
commit
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/* Arduino SoftI2cMaster Library
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* Copyright (C) 2009 by William Greiman
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*
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* This file is part of the Arduino SoftI2cMaster 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 SoftI2cMaster Library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#include "SoftI2cMaster.h"
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//------------------------------------------------------------------------------
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// WARNING don't change anything unless you verify the change with a scope
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//------------------------------------------------------------------------------
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// init pins and set bus high
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void SoftI2cMaster::init(uint8_t sclPin, uint8_t sdaPin)
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{
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sclPin_ = sclPin;
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sdaPin_ = sdaPin;
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pinMode(sclPin_, OUTPUT);
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digitalWrite(sdaPin_, HIGH); //Mark_H fix
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pinMode(sdaPin_, OUTPUT);
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digitalWrite(sclPin_, HIGH);
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digitalWrite(sdaPin_, HIGH);
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}
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//------------------------------------------------------------------------------
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// read a byte and send Ack if last is false else Nak to terminate read
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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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// make sure pullup enabled
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digitalWrite(sdaPin_, HIGH);
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pinMode(sdaPin_, INPUT);
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// read 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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delayMicroseconds(I2C_DELAY_USEC);
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digitalWrite(sclPin_, HIGH);
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if (digitalRead(sdaPin_)) b |= 1;
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digitalWrite(sclPin_, LOW);
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}
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// send Ack or Nak
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digitalWrite(sdaPin_, HIGH); //Mark_H fix
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pinMode(sdaPin_, OUTPUT);
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digitalWrite(sdaPin_, last);
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digitalWrite(sclPin_, HIGH);
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delayMicroseconds(I2C_DELAY_USEC);
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digitalWrite(sclPin_, LOW);
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digitalWrite(sdaPin_, HIGH);
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return b;
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}
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//------------------------------------------------------------------------------
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// send new address and read/write without stop
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uint8_t SoftI2cMaster::restart(uint8_t addressRW)
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{
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digitalWrite(sclPin_, HIGH);
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return start(addressRW);
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}
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//------------------------------------------------------------------------------
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// issue a start condition for i2c address with read/write bit
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uint8_t SoftI2cMaster::start(uint8_t addressRW)
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{
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digitalWrite(sdaPin_, LOW);
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delayMicroseconds(I2C_DELAY_USEC);
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digitalWrite(sclPin_, LOW);
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return write(addressRW);
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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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digitalWrite(sdaPin_, LOW);
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delayMicroseconds(I2C_DELAY_USEC);
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digitalWrite(sclPin_, HIGH);
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delayMicroseconds(I2C_DELAY_USEC);
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digitalWrite(sdaPin_, HIGH);
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delayMicroseconds(I2C_DELAY_USEC);
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}
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//------------------------------------------------------------------------------
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// write byte and return true for Ack or false for Nak
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uint8_t SoftI2cMaster::write(uint8_t b)
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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 verivy the change with a scope
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digitalWrite(sdaPin_, m & b);
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digitalWrite(sclPin_, HIGH);
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delayMicroseconds(I2C_DELAY_USEC);
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digitalWrite(sclPin_, LOW);
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}
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// get Ack or Nak
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digitalWrite(sdaPin_, HIGH);
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pinMode(sdaPin_, INPUT);
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digitalWrite(sclPin_, HIGH);
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b = digitalRead(sdaPin_);
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digitalWrite(sclPin_, LOW);
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digitalWrite(sdaPin_, HIGH); //Mark_H fix
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pinMode(sdaPin_, OUTPUT);
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return b == 0;
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}
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//------------------------------------------------------------------------------
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// write byte and return true for Ack or false for Nak
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uint8_t SoftI2cMaster::ldacwrite(uint8_t b, uint8_t ldacpin)
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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 verivy the change with a scope
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digitalWrite(sdaPin_, m & b);
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digitalWrite(sclPin_, HIGH);
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delayMicroseconds(I2C_DELAY_USEC);
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digitalWrite(sclPin_, LOW);
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}
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// get Ack or Nak
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digitalWrite(ldacpin, LOW);
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digitalWrite(sdaPin_, HIGH);
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pinMode(sdaPin_, INPUT);
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digitalWrite(sclPin_, HIGH);
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b = digitalRead(sdaPin_);
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digitalWrite(sclPin_, LOW);
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digitalWrite(sdaPin_, HIGH); //Mark_H fix
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pinMode(sdaPin_, OUTPUT);
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return b == 0;
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}
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@ -0,0 +1,53 @@
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/* Arduino SoftI2cMaster Library
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* Copyright (C) 2009 by William Greiman
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*
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* This file is part of the Arduino SoftI2cMaster 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 SoftI2cMaster Library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#ifndef SOFT_I2C_MASTER
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#define SOFT_I2C_MASTER
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#include <TwoWireBase.h>
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// delay used to tweek signals
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#define I2C_DELAY_USEC 10
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class SoftI2cMaster : public TwoWireBase {
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uint8_t sclPin_;
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uint8_t sdaPin_;
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public:
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/** init bus */
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void init(uint8_t sclPin, uint8_t sdaPin);
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/** read a byte and send Ack if last is false else Nak to terminate read */
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uint8_t read(uint8_t last);
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/** send new address and read/write bit without stop */
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uint8_t restart(uint8_t addressRW);
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/** issue a start condition for i2c address with read/write bit */
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uint8_t start(uint8_t addressRW);
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/** issue a stop condition */
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void stop(void);
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/** write byte and return true for Ack or false for Nak */
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uint8_t write(uint8_t b);
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/** write byte and return true for Ack or false for Nak */
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uint8_t ldacwrite(uint8_t b, uint8_t);
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};
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#endif //SOFT_I2C_MASTER
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@ -0,0 +1,45 @@
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/* Arduino SoftI2cMaster and TwiMaster Libraries
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* Copyright (C) 2009 by William Greiman
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*
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* This file is part of the Arduino SoftI2cMaster and TwiMaster Libraries
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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 SoftI2cMaster and TwiMaster Libraries.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef TWO_WIRE_BASE_H
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#define TWO_WIRE_BASE_H
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#include <Arduino.h>
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// R/W direction bit to OR with address for start or restart
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#define I2C_READ 1
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#define I2C_WRITE 0
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class TwoWireBase {
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public:
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/** read a byte and send Ack if last is false else Nak to terminate read */
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virtual uint8_t read(uint8_t last) = 0;
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/** send new address and read/write bit without stop */
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virtual uint8_t restart(uint8_t addressRW) = 0;
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/** issue a start condition for i2c address with read/write bit */
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virtual uint8_t start(uint8_t addressRW) = 0;
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/** issue a stop condition */
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virtual void stop(void) = 0;
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/** write byte and return true for Ack or false for Nak */
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virtual uint8_t write(uint8_t data) = 0;
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};
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#endif // TWO_WIRE_BASE_H
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