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80 lines
2.0 KiB
C
80 lines
2.0 KiB
C
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/*
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SoftwareI2C.h
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2012 Copyright (c) Seeed Technology Inc. All right reserved.
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Author:Loovee
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2013-11-1
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This is a Software I2C Library, can act as I2c master mode.
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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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*/
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#ifndef _SOFTWAREI2C_H_
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#define _SOFTWAREI2C_H_
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#include <rtthread.h>
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#include <rtdevice.h>
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#define GETACK 1 // get ack
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#define GETNAK 0 // get nak
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#ifndef HIGH
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#define HIGH 1
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#endif
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#ifndef LOW
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#define LOW 0
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#endif
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class SoftwareI2C
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{
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private:
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int pinSda;
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int pinScl;
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int recv_len;
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int sda_in_out;
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private:
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inline void sdaSet(rt_uint8_t ucDta);
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inline void sclSet(rt_uint8_t ucDta);
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inline void sendStart(void);
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inline void sendStop(void);
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inline void sendByte(rt_uint8_t ucDta);
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inline rt_uint8_t getAck(void);
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inline rt_uint8_t sendByteAck(rt_uint8_t ucDta); // send byte and get ack
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inline unsigned long micros();
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public:
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void begin(int Sda, int Scl);
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rt_uint8_t beginTransmission(rt_uint8_t addr);
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rt_uint8_t endTransmission();
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rt_uint8_t write(rt_uint8_t dta);
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rt_uint8_t write(rt_uint8_t *dta, rt_uint8_t len);
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rt_uint8_t read();
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rt_uint8_t requestFrom(rt_uint8_t addr, rt_uint8_t len);
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rt_uint8_t available(){return recv_len;}
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};
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#endif
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