[136] | 1 | /*
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| 2 | * TwoWire.h - TWI/I2C library for Arduino Due
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| 3 | * Copyright (c) 2011 Cristian Maglie <c.maglie@bug.st>.
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| 4 | * All rights reserved.
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| 5 | *
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| 6 | * This library is free software; you can redistribute it and/or
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| 7 | * modify it under the terms of the GNU Lesser General Public
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| 8 | * License as published by the Free Software Foundation; either
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| 9 | * version 2.1 of the License, or (at your option) any later version.
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| 10 | *
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| 11 | * This library is distributed in the hope that it will be useful,
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 14 | * Lesser General Public License for more details.
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| 15 | *
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| 16 | * You should have received a copy of the GNU Lesser General Public
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| 17 | * License along with this library; if not, write to the Free Software
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| 18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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| 19 | */
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| 20 |
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| 21 | #ifndef TwoWire_h
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| 22 | #define TwoWire_h
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| 23 |
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| 24 | //#include <include/twi.h>
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| 25 |
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| 26 | #include "Stream.h"
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| 27 | #include "variant.h"
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| 28 |
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| 29 | #include "SERCOM.h"
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| 30 | #include "RingBuffer.h"
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| 31 |
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| 32 | #define BUFFER_LENGTH 32
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| 33 |
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| 34 |
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| 35 | class TwoWire : public Stream
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| 36 | {
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| 37 | public:
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| 38 | TwoWire(SERCOM *s);
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| 39 | void begin();
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| 40 | void begin(uint8_t);
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| 41 |
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| 42 | void beginTransmission(uint8_t);
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| 43 | uint8_t endTransmission(bool stopBit);
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| 44 | uint8_t endTransmission(void);
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| 45 |
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| 46 | uint8_t requestFrom(uint8_t address, size_t quantity, bool stopBit);
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| 47 | uint8_t requestFrom(uint8_t address, size_t quantity);
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| 48 |
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| 49 | size_t write(uint8_t data);
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| 50 | size_t write(const uint8_t * data, size_t quantity);
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| 51 |
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| 52 | virtual int available(void);
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| 53 | virtual int read(void);
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| 54 | virtual int peek(void);
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| 55 | virtual void flush(void);
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| 56 | void onReceive(void(*)(int));
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| 57 | void onRequest(void(*)(void));
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| 58 |
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| 59 | using Print::write;
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| 60 |
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| 61 | void onService(void);
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| 62 |
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| 63 | private:
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| 64 | SERCOM * sercom;
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| 65 | bool transmissionBegun;
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| 66 |
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| 67 | // RX Buffer
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| 68 | RingBuffer rxBuffer;
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| 69 |
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| 70 | //TX buffer
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| 71 | RingBuffer txBuffer;
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| 72 | uint8_t txAddress;
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| 73 |
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| 74 |
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| 75 | // Service buffer
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| 76 | //uint8_t srvBuffer[BUFFER_LENGTH];
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| 77 | //uint8_t srvBufferIndex;
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| 78 | //uint8_t srvBufferLength;
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| 79 |
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| 80 | // Callback user functions
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| 81 | void (*onRequestCallback)(void);
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| 82 | void (*onReceiveCallback)(int);
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| 83 |
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| 84 | // TWI state
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| 85 | //enum TwoWireStatus
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| 86 | //{
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| 87 | // UNINITIALIZED,
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| 88 | // MASTER_IDLE,
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| 89 | // MASTER_SEND,
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| 90 | // MASTER_RECV,
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| 91 | // SLAVE_IDLE,
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| 92 | // SLAVE_RECV,
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| 93 | // SLAVE_SEND
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| 94 | //};
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| 95 | //TwoWireStatus status;
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| 96 |
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| 97 | // TWI clock frequency
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| 98 | static const uint32_t TWI_CLOCK = 100000;
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| 99 |
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| 100 | // Timeouts
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| 101 | //static const uint32_t RECV_TIMEOUT = 100000;
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| 102 | //static const uint32_t XMIT_TIMEOUT = 100000;
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| 103 | };
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| 104 |
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| 105 | extern TwoWire Wire;
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| 106 |
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| 107 | #endif
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