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120 lines
3.0 KiB
C++
120 lines
3.0 KiB
C++
/*
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* TwoWire.h - TWI/I2C library for Arduino Due
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* Copyright (c) 2011 Cristian Maglie <c.maglie@arduino.cc>
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* All rights reserved.
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*
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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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*
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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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*
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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 TwoWire_h
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#define TwoWire_h
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// Include Atmel CMSIS driver
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#include <include/twi.h>
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#include "Stream.h"
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#include "variant.h"
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#define BUFFER_LENGTH 32
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class TwoWire : public Stream {
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public:
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TwoWire(Twi *twi, void(*begin_cb)(void));
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void begin();
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void begin(uint8_t);
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void begin(int);
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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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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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virtual size_t write(uint8_t);
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virtual size_t write(const uint8_t *, size_t);
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virtual int available(void);
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virtual int read(void);
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virtual int peek(void);
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virtual void flush(void);
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void onReceive(void(*)(int));
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void onRequest(void(*)(void));
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inline size_t write(unsigned long n) { return write((uint8_t)n); }
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inline size_t write(long n) { return write((uint8_t)n); }
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inline size_t write(unsigned int n) { return write((uint8_t)n); }
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inline size_t write(int n) { return write((uint8_t)n); }
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using Print::write;
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void onService(void);
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private:
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// RX Buffer
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uint8_t rxBuffer[BUFFER_LENGTH];
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uint8_t rxBufferIndex;
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uint8_t rxBufferLength;
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// TX Buffer
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uint8_t txAddress;
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uint8_t txBuffer[BUFFER_LENGTH];
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uint8_t txBufferLength;
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// Service buffer
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uint8_t srvBuffer[BUFFER_LENGTH];
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uint8_t srvBufferIndex;
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uint8_t srvBufferLength;
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// Callback user functions
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void (*onRequestCallback)(void);
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void (*onReceiveCallback)(int);
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// Called before initialization
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void (*onBeginCallback)(void);
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// TWI instance
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Twi *twi;
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// TWI state
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enum TwoWireStatus {
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UNINITIALIZED,
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MASTER_IDLE,
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MASTER_SEND,
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MASTER_RECV,
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SLAVE_IDLE,
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SLAVE_RECV,
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SLAVE_SEND
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};
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TwoWireStatus status;
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// TWI clock frequency
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static const uint32_t TWI_CLOCK = 100000;
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uint32_t twiClock;
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// Timeouts (
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static const uint32_t RECV_TIMEOUT = 100000;
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static const uint32_t XMIT_TIMEOUT = 100000;
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};
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#if WIRE_INTERFACES_COUNT > 0
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extern TwoWire Wire;
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#endif
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#if WIRE_INTERFACES_COUNT > 1
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extern TwoWire Wire1;
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#endif
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#endif
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