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/******************************************************************************
* The MIT License
*
* Copyright (c) 2010 LeafLabs LLC.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*****************************************************************************/
/**
* @brief Wire library, ported from Arduino. Provides a lean
* interface to I2C (two-wire) communication.
*/
#include "wirish.h"
#ifndef _WIRE_H_
#define _WIRE_H_
typedef struct {
uint8 scl;
uint8 sda;
} Port;
/* You must update the online docs if you change this value. */
#define WIRE_BUFSIZ 32
/* return codes from endTransmission() */
#define SUCCESS 0 /* transmission was successful */
#define EDATA 1 /* too much data */
#define ENACKADDR 2 /* received nack on transmit of address */
#define ENACKTRNS 3 /* received nack on transmit of data */
#define EOTHER 4 /* other error */
#define SDA 20
#define SCL 21
#define I2C_WRITE 0
#define I2C_READ 1
#define I2C_DELAY do{for(int i=0;i<50;i++) {asm volatile("nop");}}while(0)
class TwoWire {
private:
uint8 rx_buf[WIRE_BUFSIZ]; /* receive buffer */
uint8 rx_buf_idx; /* first unread idx in rx_buf */
uint8 rx_buf_len; /* number of bytes read */
uint8 tx_addr; /* address transmitting to */
uint8 tx_buf[WIRE_BUFSIZ]; /* transmit buffer */
uint8 tx_buf_idx; /* next idx available in tx_buf, -1 overflow */
boolean tx_buf_overflow;
Port port;
uint8 writeOneByte(uint8);
uint8 readOneByte(uint8, uint8*);
public:
TwoWire();
void begin();
void begin(uint8, uint8);
void beginTransmission(uint8);
void beginTransmission(int);
uint8 endTransmission(void);
uint8 requestFrom(uint8, int);
uint8 requestFrom(int, int);
void send(uint8);
void send(uint8*, int);
void send(int);
void send(int*, int);
void send(char*);
uint8 available();
uint8 receive();
};
void i2c_start(Port port);
void i2c_stop(Port port);
boolean i2c_get_ack(Port port);
void i2c_send_ack(Port port);
void i2c_send_nack(Port port);
uint8 i2c_shift_in(Port port);
void i2c_shift_out(Port port, uint8 val);
extern TwoWire Wire;
#endif // _WIRE_H_
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