96 lines
2.5 KiB
C++
96 lines
2.5 KiB
C++
/*
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TwoWire.h - TWI/I2C library for Arduino & Wiring
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Copyright (c) 2006 Nicholas Zambetti. All right reserved.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Modified 2012 by Todd Krein (todd@krein.org) to implement repeated starts
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Modified December 2014 by Ivan Grokhotkov (ivan@esp8266.com) - esp8266 support
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Modified April 2015 by Hrsto Gochkov (ficeto@ficeto.com) - alternative esp8266 support
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*/
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#ifndef TwoWire_h
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#define TwoWire_h
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#include <esp32-hal.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/queue.h"
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#define I2C_BUFFER_LENGTH 128
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class TwoWire
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{
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protected:
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uint8_t num;
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int8_t sda;
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int8_t scl;
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i2c_t * i2c;
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uint8_t rxBuffer[I2C_BUFFER_LENGTH];
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uint16_t rxIndex;
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uint16_t rxLength;
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uint8_t txBuffer[I2C_BUFFER_LENGTH];
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uint16_t txIndex;
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uint16_t txLength;
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uint8_t txAddress;
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uint8_t transmitting;
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public:
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TwoWire(uint8_t bus_num);
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void begin(int sda=-1, int scl=-1, uint32_t frequency=100000);
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void setClock(uint32_t);
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void beginTransmission(uint8_t);
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void beginTransmission(int);
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uint8_t endTransmission(void);
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uint8_t endTransmission(uint8_t);
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size_t requestFrom(uint8_t address, size_t size, bool sendStop);
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uint8_t requestFrom(uint8_t, uint8_t);
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uint8_t requestFrom(uint8_t, uint8_t, uint8_t);
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uint8_t requestFrom(int, int);
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uint8_t requestFrom(int, int, int);
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size_t write(uint8_t);
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size_t write(const uint8_t *, size_t);
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int available(void);
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int read(void);
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int peek(void);
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void flush(void);
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inline size_t write(unsigned long n)
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{
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return write((uint8_t)n);
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}
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inline size_t write(long n)
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{
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return write((uint8_t)n);
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}
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inline size_t write(unsigned int n)
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{
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return write((uint8_t)n);
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}
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inline size_t write(int n)
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{
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return write((uint8_t)n);
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}
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};
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extern TwoWire Wire;
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#endif
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