533f9ee332
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This commit allows to synchronise multiple HackRFs with a synchronisation error **below 1 sampling period**
> WARNING: Use this at your own risk. If you don't know what you are doing you may damage your HackRF.
> The author takes no responsability for potential damages
Usage example: synchronise two HackRFs
======================================
1. Chose the master HackRF which will send the synchronisation pulse (HackRF0). HackRF1 will represent the slave hackrf.
2. Retreive the serial number of both HackRFs using `hackrf_info`
3. Use a wire to connect `SYNC_CMD` of HackRF0 to `SYNC_IN` of HackRF0 and HackRF1
4. Run `hackrf_transfer` with the argument `-H 1` to enable hardware synchronisation:
```
$ hackrf_tranfer ... -r rec1.bin -d HackRF1_serial -H 1 | hackrf_transfer ... -r rec0.bin -d HackRF0_serial -H 1
```
rec0.bin and rec1.bin will have a time offset below 1 sampling period.
The 1PPS output of GNSS receivers can be used to synchronise HackRFs even if they are far from each other.
>DON'T APPLY INCOMPATIBLE VOLTAGE LEVELS TO THE CPLD PINS
Signal | Header |Pin | Description
-------|--------|----|------------
`SYNC_IN` | P28 | 16 | Synchronisation pulse input
`SYNC_CMD` | P28 | 15 | Synchronisation pulse output
Note:
=====
I had to remove CPLD-based decimation to use a GPIO for enabling hardware.
More info:
==========
[M. Bartolucci, J. A. Del Peral-Rosado, R. Estatuet-Castillo, J. A. Garcia-Molina, M. Crisci and G. E. Corazza, "Synchronisation of low-cost open source SDRs for navigation applications," 2016 8th ESA Workshop on Satellite Navigation Technologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC), Noordwijk, 2016, pp. 1-7.](http://ieeexplore.ieee.org/document/7849328/)
[Alternative link](http://spcomnav.uab.es/docs/conferences/Bartolucci_NAVITEC_2016.pdf)
This repository contains host software (Linux/Windows) for HackRF, a project to produce a low cost, open source software radio platform.
##How to build the host software on Linux:
###Prerequisites for Linux (Debian/Ubuntu):
sudo apt-get install build-essential cmake libusb-1.0-0-dev pkg-config libfftw3-dev
###Build host software on Linux:
mkdir host/build
cd host/build
cmake ..
make
sudo make install
sudo ldconfig
By defualt this will attempt to install a udev rule to '/etc/udev/rules.dto provide theusborplugdevgroup access to HackRF. If your setup requires the udev rule to be installed elsewhere you can modify the path with-DUDEV_RULES_PATH=/path/to/udev`.
Note: The udev rule is not installed for by default for PyBOMBS installs as they do not ususally get installed with root privileges.
##Clean CMake temporary files/dirs:
cd host/build
rm -rf *
##How to build host software on Windows: ###Prerequisites for cygwin, mingw, or Visual Studio:
- cmake-2.8.12.1 or later from http://www.cmake.org/cmake/resources/software.html
- libusbx-1.0.18 or later from http://sourceforge.net/projects/libusbx/files/latest/download?source=files
- fftw-3.3.5 or later from http://www.fftw.org/install/windows.html
- Install Windows driver for HackRF hardware or use Zadig see http://sourceforge.net/projects/libwdi/files/zadig
- If you want to use Zadig select HackRF USB device and just install/replace it with WinUSB driver.
Note for Windows build: You shall always execute hackrf-tools from Windows command shell and not from Cygwin or Mingw shell because on Cygwin/Mingw Ctrl C is not managed correctly and especially for hackrf_transfer the Ctrl C(abort) will not stop correctly and will corrupt the file.
###For Cygwin:
mkdir host/build
cd host/build
cmake ../ -G "Unix Makefiles" -DCMAKE_LEGACY_CYGWIN_WIN32=1 -DLIBUSB_INCLUDE_DIR=/usr/local/include/libusb-1.0/
make
make install
###For MinGW:
mkdir host/build
cd host/build
cmake ../ -G "MSYS Makefiles" -DLIBUSB_INCLUDE_DIR=/usr/local/include/libusb-1.0/
make
make install
###For Visual Studio 2015 x64
Create library definition for MSVC to link to
C:\fftw-3.3.5-dll64> lib /machine:x64 /def:libfftw3f-3.def
c:\hackrf\host\build> cmake ../ -G "Visual Studio 14 2015 Win64" \
-DLIBUSB_INCLUDE_DIR=c:\libusb-1.0.21\libusb \
-DLIBUSB_LIBRARIES=c:\libusb-1.0.21\MS64\dll\lib\libusb-1.0.lib \
-DTHREADS_PTHREADS_INCLUDE_DIR=c:\pthreads-w32-2-9-1-release\Pre-built.2\include \
-DTHREADS_PTHREADS_WIN32_LIBRARY=c:\pthreads-w32-2-9-1-release\Pre-built.2\lib\x64\pthreadVC2.lib \
-DFFTW_INCLUDES=C:\fftw-3.3.5-dll64 \
-DFFTW_LIBRARIES=C:\fftw-3.3.5-dll64\libfftw3f-3.lib
Cmake will produce a solution file named HackRF.sln and a series of
project files which can be built with msbuild as follows:
c:\hackrf\host\build> msbuild HackRF.sln
##How to build host the software on FreeBSD
You can use the binary package:
# pkg install hackrf
You can build and install from ports:
# cd /usr/ports/comms/hackrf
# make install
principal author: Michael Ossmann mike@ossmann.com