#!/usr/bin/env python2
# -*- coding: utf-8 -*-
##################################################
# GNU Radio Python Flow Graph
# Title: Precoded Gmsk
# Generated: Tue Jun 20 14:57:07 2017
##################################################

from gnuradio import digital
from gnuradio import eng_notation
from gnuradio import gr
from gnuradio import uhd
from gnuradio.eng_option import eng_option
from gnuradio.filter import firdes
from optparse import OptionParser
import time


class precoded_gmsk(gr.top_block):

    def __init__(self):
        gr.top_block.__init__(self, "Precoded Gmsk")

        ##################################################
        # Variables
        ##################################################
        self.samp_rate = samp_rate = 4e6

        ##################################################
        # Blocks
        ##################################################
        self.uhd_usrp_sink_0 = uhd.usrp_sink(
        	",".join(("", "")),
        	uhd.stream_args(
        		cpu_format="fc32",
        		channels=range(1),
        	),
        )
        self.uhd_usrp_sink_0.set_samp_rate(samp_rate)
        self.uhd_usrp_sink_0.set_center_freq(200e6, 0)
        self.uhd_usrp_sink_0.set_gain(20, 0)
        self.uhd_usrp_sink_0.set_antenna("TX/RX", 0)
        self.digital_gmskmod_bc_0 = digital.gmskmod_bc(4, 2, 0.5)
        self.digital_glfsr_source_x_0 = digital.glfsr_source_b(13, True, 0x0000100D, 0xA5A5)
        self.digital_diff_encoder_bb_0 = digital.diff_encoder_bb(2)

        ##################################################
        # Connections
        ##################################################
        self.connect((self.digital_diff_encoder_bb_0, 0), (self.digital_gmskmod_bc_0, 0))    
        self.connect((self.digital_glfsr_source_x_0, 0), (self.digital_diff_encoder_bb_0, 0))    
        self.connect((self.digital_gmskmod_bc_0, 0), (self.uhd_usrp_sink_0, 0))    

    def get_samp_rate(self):
        return self.samp_rate

    def set_samp_rate(self, samp_rate):
        self.samp_rate = samp_rate
        self.uhd_usrp_sink_0.set_samp_rate(self.samp_rate)


def main(top_block_cls=precoded_gmsk, options=None):

    tb = top_block_cls()
    tb.start()
    try:
        raw_input('Press Enter to quit: ')
    except EOFError:
        pass
    tb.stop()
    tb.wait()


if __name__ == '__main__':
    main()