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/*
* TWI/I2C library for mRF5x
* Copyright (c) 2015 Arduino LLC. All rights reserved.
* Copyright (c) 2016 Sandeep Mistry All right 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 "nrf.h"
#include "Stream.h"
#include "variant.h"
#include "RingBuffer.h"
// WIRE_HAS_END means Wire has end()
#define WIRE_HAS_END 1
class TwoWire : public Stream
{
public:
#if defined(NRF52) || defined(NRF52_SERIES)
TwoWire(NRF_TWIM_Type * p_twim, NRF_TWIS_Type * p_twis, IRQn_Type IRQn, uint8_t pinSDA, uint8_t pinSCL);
#else
TwoWire(NRF_TWI_Type * p_twi, uint8_t pinSDA, uint8_t pinSCL);
#endif
void begin();
#if defined(NRF52) || defined(NRF52_SERIES)
void begin(uint8_t);
#endif
void end();
void setClock(uint32_t);
void beginTransmission(uint8_t);
uint8_t endTransmission(bool stopBit);
uint8_t endTransmission(void);
uint8_t requestFrom(uint8_t address, size_t quantity, bool stopBit);
uint8_t requestFrom(uint8_t address, size_t quantity);
size_t write(uint8_t data);
size_t write(const uint8_t * data, size_t quantity);
virtual int available(void);
virtual int read(void);
virtual int peek(void);
virtual void flush(void);
#if defined(NRF52) || defined(NRF52_SERIES)
void onReceive(void(*)(int));
void onRequest(void(*)(void));
void onService(void);
#endif
using Print::write;
private:
#if defined(NRF52) || defined(NRF52_SERIES)
NRF_TWIM_Type * _p_twim;
NRF_TWIS_Type * _p_twis;
#else
NRF_TWI_Type * _p_twi;
#endif
IRQn_Type _IRQn;
uint8_t _uc_pinSDA;
uint8_t _uc_pinSCL;
bool master;
bool receiving;
bool transmissionBegun;
bool suspended;
// RX Buffer
RingBuffer rxBuffer;
// TX buffer
RingBuffer txBuffer;
uint8_t txAddress;
// Callback user functions
void (*onRequestCallback)(void);
void (*onReceiveCallback)(int);
// TWI clock frequency
static const uint32_t TWI_CLOCK = 100000;
};
#if WIRE_INTERFACES_COUNT > 0
extern TwoWire Wire;
#endif
#endif
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