/* * TwoWire.h - TWI/I2C library for Arduino Due * Copyright (c) 2011 Cristian Maglie * All rights reserved. * * 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 2.1 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 TwoWire_h #define TwoWire_h // Include Atmel CMSIS driver #include #include "Stream.h" #include "variant.h" #define BUFFER_LENGTH 32 class TwoWire : public Stream { public: TwoWire(Twi *twi, void(*begin_cb)(void)); void begin(); void begin(uint8_t); void begin(int); void setClock(uint32_t); void beginTransmission(uint8_t); void beginTransmission(int); uint8_t endTransmission(void); uint8_t endTransmission(uint8_t); uint8_t requestFrom(uint8_t, uint8_t); uint8_t requestFrom(uint8_t, uint8_t, uint8_t); uint8_t requestFrom(uint8_t, uint8_t, uint32_t, uint8_t, uint8_t); uint8_t requestFrom(int, int); uint8_t requestFrom(int, int, int); virtual size_t write(uint8_t); virtual size_t write(const uint8_t *, size_t); virtual int available(void); virtual int read(void); virtual int peek(void); virtual void flush(void); void onReceive(void(*)(int)); void onRequest(void(*)(void)); inline size_t write(unsigned long n) { return write((uint8_t)n); } inline size_t write(long n) { return write((uint8_t)n); } inline size_t write(unsigned int n) { return write((uint8_t)n); } inline size_t write(int n) { return write((uint8_t)n); } using Print::write; void onService(void); private: // RX Buffer uint8_t rxBuffer[BUFFER_LENGTH]; uint8_t rxBufferIndex; uint8_t rxBufferLength; // TX Buffer uint8_t txAddress; uint8_t txBuffer[BUFFER_LENGTH]; uint8_t txBufferLength; // Service buffer uint8_t srvBuffer[BUFFER_LENGTH]; uint8_t srvBufferIndex; uint8_t srvBufferLength; // Callback user functions void (*onRequestCallback)(void); void (*onReceiveCallback)(int); // Called before initialization void (*onBeginCallback)(void); // TWI instance Twi *twi; // TWI state enum TwoWireStatus { UNINITIALIZED, MASTER_IDLE, MASTER_SEND, MASTER_RECV, SLAVE_IDLE, SLAVE_RECV, SLAVE_SEND }; TwoWireStatus status; // TWI clock frequency static const uint32_t TWI_CLOCK = 100000; uint32_t twiClock; // Timeouts ( static const uint32_t RECV_TIMEOUT = 100000; static const uint32_t XMIT_TIMEOUT = 100000; }; #if WIRE_INTERFACES_COUNT > 0 extern TwoWire Wire; #endif #if WIRE_INTERFACES_COUNT > 1 extern TwoWire Wire1; #endif #endif