void write_i2c(boost::uint8_t addr, const byte_vector_t &bytes){
//allocate some memory for this transaction
UHD_ASSERT_THROW(bytes.size() <= max_i2c_data_bytes);
boost::uint8_t mem[sizeof(usrp_e_i2c) + max_i2c_data_bytes];
//load the data struct
usrp_e_i2c *data = reinterpret_cast<usrp_e_i2c*>(mem);
data->addr = addr;
data->len = bytes.size();
std::copy(bytes.begin(), bytes.end(), data->data);
//call the spi ioctl
this->ioctl(USRP_E_I2C_WRITE, data);
}
//negative sum of bytes excluding checksum byte
static uint8_t checksum(const byte_vector_t &bytes){
int sum = 0;
for (size_t i = 0; i < std::min(bytes.size(), size_t(DB_EEPROM_CHKSUM)); i++){
sum -= int(bytes.at(i));
}
UHD_LOG_TRACE("DB_EEPROM", boost::format("byte sum: 0x%02x") % sum)
return uint8_t(sum);
}
//negative sum of bytes excluding checksum byte
static boost::uint8_t checksum(const byte_vector_t &bytes){
int sum = 0;
for (size_t i = 0; i < std::min(bytes.size(), size_t(DB_EEPROM_CHKSUM)); i++){
sum -= int(bytes.at(i));
}
UHD_LOGV(often) << boost::format("sum: 0x%02x") % sum << std::endl;
return boost::uint8_t(sum);
}
void write_i2c(boost::uint8_t addr, const byte_vector_t &bytes){
byte_vector_t rw_bytes(bytes);
//setup the message
i2c_msg msg;
msg.addr = addr;
msg.flags = 0;
msg.len = bytes.size();
msg.buf = &rw_bytes.front();
//setup the data
i2c_rdwr_ioctl_data data;
data.msgs = &msg;
data.nmsgs = 1;
//call the ioctl
UHD_ASSERT_THROW(::ioctl(_node_fd, I2C_RDWR, &data) >= 0);
}
