Directory libgwn/GR_packet contains .py files generated from GR (GNU Radio) .grc files packet_tx.grc, packet_rx_grc and packet_loopback_hier.grc. These .py files were modified by hand with some small corrections.
The files were obtained by loading the .grc files in GRC (GNU Radio Companion), generating the flowgraphs (.py files), and then correcting these .py files. The .py files were stored by GRC in ~/.grc_gnuradio, and copied here to ensure they will not be inadvertently modified.
From files packet_tx and packet_rx the following GWN blocks were created, with all inputs and outputs, and all parameters with default values, similar to original GR versions::
packet_tx_gwn : Packet Tx GWN
packet_tx_gwn : Packet Rx GWN
Modifications to these files::
- constructor parameters with default value None; for each parameter, if argument value is None, a default value is assigned. Default values assigned to all parameters ensure correct execution. Assigning to parameters default values by means of formulas in de init function resulted in some cases in segmentation fault errors. Hence, all parameters in the init function are assigned None values, and initialization occurs in the body of the init function. The default values assigned were taken from the
packet_loopback_hier.grcexample flowgraph provided by GNU Radio. - once an argument value has been assigned to an atribute (self field), the attribute is used in all the class. This corrects the non recommended situation of using the parameter variable inside the constructor instead of the attribute to which this value had been asigned. E.g. use
self.hdr_encin rest of function instead ofhdr_enc. - parameter
ebadded as such inpacket_tx.
Original GR files in local /usr/share/gnuradio/examples/digital/packet/ ::
packet_tx.grc
packet_rx.grc
packet_loopback_hier.grc