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gnss-sdr/src/algorithms/signal_source/libs/fpga_switch.cc
Carles Fernandez 0d60d97c24
Use https instead of http in links when available
Update copyright year in headers
2018-05-13 22:49:11 +02:00

119 lines
3.4 KiB
C++

/*!
* \file fpga_switch.cc
* \brief Switch that connects the HW accelerator queues to the analog front end or the DMA.
* \authors <ul>
* <li> Marc Majoral, 2017. mmajoral(at)cttc.cat
* <li> Javier Arribas, 2015. jarribas(at)cttc.es
* </ul>
*
* Class that controls a switch in the FPGA
*
*
* -------------------------------------------------------------------------
*
* Copyright (C) 2010-2018 (see AUTHORS file for a list of contributors)
*
* GNSS-SDR is a software defined Global Navigation
* Satellite Systems receiver
*
* This file is part of GNSS-SDR.
*
* GNSS-SDR 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.
*
* GNSS-SDR 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 GNSS-SDR. If not, see <https://www.gnu.org/licenses/>.
*
* -------------------------------------------------------------------------
*/
#include "fpga_switch.h"
#include <glog/logging.h>
#include <fcntl.h> // for open, O_RDWR, O_SYNC
#include <iostream> // for cout, endl
#include <sys/mman.h> // for mmap
// constants
const size_t PAGE_SIZE = 0x10000;
const unsigned int TEST_REGISTER_TRACK_WRITEVAL = 0x55AA;
fpga_switch::fpga_switch(std::string device_name)
{
if ((d_device_descriptor = open(device_name.c_str(), O_RDWR | O_SYNC)) == -1)
{
LOG(WARNING) << "Cannot open deviceio" << device_name;
}
d_map_base = reinterpret_cast<volatile unsigned *>(mmap(nullptr, PAGE_SIZE,
PROT_READ | PROT_WRITE, MAP_SHARED, d_device_descriptor, 0));
if (d_map_base == reinterpret_cast<void *>(-1))
{
LOG(WARNING) << "Cannot map the FPGA switch module into tracking memory";
std::cout << "Could not map switch memory." << std::endl;
}
else
{
std::cout << "Switch memory successfully mapped." << std::endl;
}
// sanity check : check test register
unsigned writeval = TEST_REGISTER_TRACK_WRITEVAL;
unsigned readval;
readval = fpga_switch::fpga_switch_test_register(writeval);
if (writeval != readval)
{
LOG(WARNING) << "Test register sanity check failed";
}
else
{
LOG(INFO) << "Test register sanity check success !";
}
DLOG(INFO) << "Switch FPGA class created";
}
fpga_switch::~fpga_switch()
{
close_device();
}
void fpga_switch::set_switch_position(int switch_position)
{
d_map_base[0] = switch_position;
}
unsigned fpga_switch::fpga_switch_test_register(
unsigned writeval)
{
unsigned readval;
// write value to test register
d_map_base[3] = writeval;
// read value from test register
readval = d_map_base[3];
// return read value
return readval;
}
void fpga_switch::close_device()
{
unsigned *aux = const_cast<unsigned *>(d_map_base);
if (munmap(static_cast<void *>(aux), PAGE_SIZE) == -1)
{
std::cout << "Failed to unmap memory uio" << std::endl;
}
close(d_device_descriptor);
}