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SlowSoftI2CMaster.h
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SlowSoftI2CMaster.h
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/* Arduino Slow Software I2C Master
Copyright (c) 2017 Bernhard Nebel.
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 3 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef SLOW_SOFT_I2C_MASTER_H
#define SLOW_SOFT_I2C_MASTER_H
#include <Arduino.h>
#include <inttypes.h>
#define I2C_READ 1
#define I2C_WRITE 0
#define DELAY 4 // usec delay
#define BUFFER_LENGTH 32
#define I2C_MAXWAIT 5000
class SlowSoftI2CMaster {
public:
SlowSoftI2CMaster(uint8_t sda, uint8_t scl);
SlowSoftI2CMaster(uint8_t sda, uint8_t scl, bool internal_pullup);
bool i2c_init(void);
bool i2c_start(uint8_t addr);
bool i2c_start_wait(uint8_t addr);
bool i2c_rep_start(uint8_t addr);
void i2c_stop(void);
bool i2c_write(uint8_t value);
uint8_t i2c_read(bool last);
bool error;
private:
void setHigh(uint8_t pin);
void setLow(uint8_t pin);
uint8_t _sda;
uint8_t _scl;
bool _pullup;
};
#endif