//----------------------------------------------------------
// EEPROM書き込み
// 引数（スレーブアドレス,アドレス,データ,バイト数）
void i2c_2_write(
unsigned char addr,
unsigned char* data,
unsigned char bytecnt)
{
i2c_start();
i2c_writebyte(0xD0); // SLA + W
i2c_writebyte(addr); // address(high 8bits)
while(bytecnt > 0){
i2c_writebyte(*data++);
bytecnt--;
}
i2c_stop();
}
//----------------------------------------------------------
// EEPROM読み込み
// 引数（スレーブアドレス,アドレス,データ,バイト数）
void i2c_2_read(
unsigned char addr,
unsigned char* data, unsigned char bytecnt)
{
i2c_start();
i2c_writebyte(0xD0); // SLA + W
i2c_writebyte(addr); // address(high 8bits)
i2c_start();
i2c_writebyte(0xD1); // SLA + R
while(bytecnt > 0){
*data++ = i2c_readbyte(bytecnt == 1);
bytecnt--;
}
i2c_stop();
}
//
// Originally, 'endTransmission' was an f(void) function.
// It has been modified to take one parameter indicating
// whether or not a STOP should be performed on the bus.
// Calling endTransmission(false) allows a sketch to
// perform a repeated start.
//
// WARNING: Nothing in the library keeps track of whether
// the bus tenure has been properly ended with a STOP. It
// is very possible to leave the bus in a hung state if
// no call to endTransmission(true) is made. Some I2C
// devices will behave oddly if they do not see a STOP.
//
uint8_t TwoWire::endTransmission(uint8_t sendStop)
{
int err;
if (sendStop == true) {
// transmit buffer (blocking)
if (txBufferLength > 1)
err = i2c_writebytes(i2c_fd, txBuffer, txBufferLength);
else if (txBufferLength == 1)
err = i2c_writebyte(i2c_fd, *txBuffer);
else
/* FIXME: A zero byte transmit is typically used to check for an
* ACK from the slave device. I'm not sure if this is the
* correct way to do this.
*/
err = i2c_readbyte(i2c_fd);
// empty buffer
txBufferLength = 0;
if (err < 0)
return 2;
return 0;
} else {
/* sendStop = false
* pretend we have held the bus while
* actually waiting for the next operation
*/
// i2c_add_to_buf(txAddress, 0, txBuffer, txBufferLength);
// i2c_transfer = 1;
return 0;
}
}
void i2c_writebuffer (uint8 BusNR, uint8* buf, uint8 size)
{
uint8 cnt;
for (cnt = 0; cnt < size; cnt++)
{
i2c_writebyte(BusNR, buf[cnt]);
}
}
