ROACH2-based data acquisition system.

The FPGA gateware is developed in Matlab/Simulink on this fork (commit a288ff3) of mlib_devel.

In addition it requires acasperelle.

See https://casper.berkeley.edu/ for more details about setting up the CASPER toolflow.

The lowest level monitor and control library r2daq.py is developed on Python and requires adc5g (0.0.1) and corr (0.7.3), as well as a few other standard python packages.

With all dependencies installed, in an IPython shell import the interface library

import r2daq

and try

r2 = r2daq.ArtooDaq('roach2_hostname',boffile='latest-build').

This will create an ArtooDaq instance which encapsulates the ROACH2 system. Some high-level methods are available to configure the system as needed, for example to tune channel a to 1234MHz, set the gain for that channel to 7, and to set the FFT shift vector for channels a and b to prevent overflow, do

r2.tune_ddc_1st_to_freq(1234e6,tag='a')

r2.set_gain(7,tag='a')

r2.set_fft_shift('1101010101010',tag='ab').

The library also enables capturing and manipulating data packets transmitted by the ROACH2. To grab 5 packets received on socket 10.0.11.1.4001, do

pkts = r2.grab_packets(n=5,dsoc_desc=("10.0.11.1",4001),close_soc=True).

This returns a list of 5 packets, each an instance of the Packet class which encapsulates the format which the ROACH2 uses to transmit data. A packet will contain either frequency-domain data (pkts[0].freq_not_time evaluates to True) or time-domain data (pkts[0].freq_not_time evaluates to False). For any packet, to get the sampled data do

x = pkts[0].interpret_data().