i2c_writebyte
i2c_writebyte(si->ps.tv_encoder.bus, si->ps.tv_encoder.adress + RD);
i2c_writebyte(BusNR, buf[cnt]);
bool i2c_writebyte (uint8 BusNR, uint8 byte);
res = i2c_writebyte(bus, addr, &ack);
status = i2c_writebyte(bus, *bytes, &ack);
static status_t i2c_writebyte(i2c_bus *bus, uint8 byte, int *ack);