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//
// Copyright 2010-2011 Ettus Research LLC
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
#include <uhd/usrp/dboard_eeprom.hpp>
#include <uhd/utils/assert.hpp>
#include <boost/format.hpp>
#include <algorithm>
#include <iostream>
using namespace uhd;
using namespace uhd::usrp;
static const bool _dboard_eeprom_debug = false;
/***********************************************************************
* Utility functions
**********************************************************************/
//! create a string from a byte vector, return empty if invalid ascii
static const std::string bytes_to_string(const byte_vector_t &bytes){
std::string out;
BOOST_FOREACH(boost::uint8_t byte, bytes){
if (byte < 32 or byte > 127) return out;
out += byte;
}
return out;
}
//! create a byte vector from a string, null terminate unless max length
static const byte_vector_t string_to_bytes(const std::string &string, size_t max_length){
byte_vector_t bytes;
for (size_t i = 0; i < std::min(string.size(), max_length); i++){
bytes.push_back(string[i]);
}
if (bytes.size() < max_length - 1) bytes.push_back('\0');
return bytes;
}
////////////////////////////////////////////////////////////////////////
// format of daughterboard EEPROM
// 00: 0xDB code for ``I'm a daughterboard''
// 01: .. Daughterboard ID (LSB)
// 02: .. Daughterboard ID (MSB)
// 03: .. io bits 7-0 direction (bit set if it's an output from m'board)
// 04: .. io bits 15-8 direction (bit set if it's an output from m'board)
// 05: .. ADC0 DC offset correction (LSB)
// 06: .. ADC0 DC offset correction (MSB)
// 07: .. ADC1 DC offset correction (LSB)
// 08: .. ADC1 DC offset correction (MSB)
// ...
// 1f: .. negative of the sum of bytes [0x00, 0x1e]
#define DB_EEPROM_MAGIC 0x00
#define DB_EEPROM_MAGIC_VALUE 0xDB
#define DB_EEPROM_ID_LSB 0x01
#define DB_EEPROM_ID_MSB 0x02
#define DB_EEPROM_OE_LSB 0x03
#define DB_EEPROM_OE_MSB 0x04
#define DB_EEPROM_OFFSET_0_LSB 0x05 // offset correction for ADC or DAC 0
#define DB_EEPROM_OFFSET_0_MSB 0x06
#define DB_EEPROM_OFFSET_1_LSB 0x07 // offset correction for ADC or DAC 1
#define DB_EEPROM_OFFSET_1_MSB 0x08
#define DB_EEPROM_SERIAL 0x09
#define DB_EEPROM_SERIAL_LEN 0x09 //9 ASCII characters
#define DB_EEPROM_CHKSUM 0x1f
#define DB_EEPROM_CLEN 0x20 // length of common portion of eeprom
#define DB_EEPROM_CUSTOM_BASE DB_EEPROM_CLEN // first avail offset for
// daughterboard specific use
////////////////////////////////////////////////////////////////////////
//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));
}
if (_dboard_eeprom_debug)
std::cout << boost::format("sum: 0x%02x") % sum << std::endl;
return boost::uint8_t(sum);
}
dboard_eeprom_t::dboard_eeprom_t(void){
id = dboard_id_t::none();
serial = "";
}
void dboard_eeprom_t::load(i2c_iface &iface, boost::uint8_t addr){
byte_vector_t bytes = iface.read_eeprom(addr, 0, DB_EEPROM_CLEN);
if (_dboard_eeprom_debug){
for (size_t i = 0; i < bytes.size(); i++){
std::cout << boost::format(
"eeprom byte[0x%02x] = 0x%02x") % i % int(bytes.at(i)
) << std::endl;
}
}
try{
UHD_ASSERT_THROW(bytes.size() >= DB_EEPROM_CLEN);
UHD_ASSERT_THROW(bytes[DB_EEPROM_MAGIC] == DB_EEPROM_MAGIC_VALUE);
UHD_ASSERT_THROW(bytes[DB_EEPROM_CHKSUM] == checksum(bytes));
//parse the ids
id = dboard_id_t::from_uint16(0
| (boost::uint16_t(bytes[DB_EEPROM_ID_LSB]) << 0)
| (boost::uint16_t(bytes[DB_EEPROM_ID_MSB]) << 8)
);
//parse the serial
serial = bytes_to_string(
byte_vector_t(&bytes.at(DB_EEPROM_SERIAL),
&bytes.at(DB_EEPROM_SERIAL+DB_EEPROM_SERIAL_LEN))
);
}catch(const uhd::assert_error &){
id = dboard_id_t::none();
serial = "";
}
}
void dboard_eeprom_t::store(i2c_iface &iface, boost::uint8_t addr){
byte_vector_t bytes(DB_EEPROM_CLEN, 0); //defaults to all zeros
bytes[DB_EEPROM_MAGIC] = DB_EEPROM_MAGIC_VALUE;
//load the id bytes
bytes[DB_EEPROM_ID_LSB] = boost::uint8_t(id.to_uint16() >> 0);
bytes[DB_EEPROM_ID_MSB] = boost::uint8_t(id.to_uint16() >> 8);
//load the serial bytes
byte_vector_t ser_bytes = string_to_bytes(serial, DB_EEPROM_SERIAL_LEN);
std::copy(ser_bytes.begin(), ser_bytes.end(), &bytes.at(DB_EEPROM_SERIAL));
//load the checksum
bytes[DB_EEPROM_CHKSUM] = checksum(bytes);
iface.write_eeprom(addr, 0, bytes);
}
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