File content as of revision 0:f3b80b2bdb14:

#include "mbed.h"
#include "SakuraIO.h"
#include "debug.h"

#define SAKURAIO_SLAVE_ADDR (0x4F << 1)

#define MODE_IDLE  0x00
#define MODE_WRITE 0x01
#define MODE_READ  0x02

void SakuraIO_I2C::begin(){
  mode = MODE_IDLE;
}

void SakuraIO_I2C::end(){
  switch(mode){
    case MODE_WRITE:
      _i2c.stop();
      break;
    case MODE_READ:
      while (_length > 0) {
        _length --;
        _i2c.read(_length > 0 ? 1 : 0);
      }
      _i2c.stop();
      break;
  }

  mode = MODE_IDLE;
}

void SakuraIO_I2C::sendByte(uint8_t data){
  if(mode != MODE_WRITE){
    dbg("beginTr\r\n");
    _i2c.start();
    _i2c.write(SAKURAIO_SLAVE_ADDR);
    mode = MODE_WRITE;
  }
  dbg("Write=%02x\r\n", data);
  _i2c.write(data);
}


uint8_t SakuraIO_I2C::startReceive(uint8_t length){
  if(mode != MODE_IDLE){
    dbg("endTransmission\r\n");
    _i2c.stop();
  }
  dbg("requestForm=%d\r\n", length);
  _length = length;
  _i2c.start();
  _i2c.write(SAKURAIO_SLAVE_ADDR | 1);
  mode = MODE_READ;
  return 0;
}

uint8_t SakuraIO_I2C::receiveByte(){
  return receiveByte(false);
}

uint8_t SakuraIO_I2C::receiveByte(bool stop){
  uint8_t ret = 0;
  if (_length > 0) {
    _length --;
    ret = _i2c.read(_length > 0 ? 1 : 0);
  }
  if(stop){
    end();
//    _i2c.stop();
//    mode = MODE_IDLE;
  }
  dbg("Read=%d\r\n", ret);
  return ret;
}

SakuraIO_I2C::SakuraIO_I2C (I2C &i2c) : _i2c(i2c) {
  mode = MODE_IDLE;
}

SakuraIO_I2C::SakuraIO_I2C (PinName sda, PinName scl) : _i2c(sda, scl) {
  mode = MODE_IDLE;
}