| #!/usr/bin/env python |
| ################################################## |
| # Gnuradio Python Flow Graph |
| # Title: Clock offset corrector |
| # Author: Piotr Krysik |
| # Generated: Wed Aug 6 15:49:59 2014 |
| ################################################## |
| |
| from gnuradio import blocks |
| from gnuradio import filter |
| from gnuradio import gr |
| from gnuradio.filter import firdes |
| import gsm |
| import math |
| |
| class clock_offset_corrector(gr.hier_block2): |
| |
| def __init__(self, ppm=0, samp_rate=1625000.0/6.0*4.0, fc=936.6e6): |
| gr.hier_block2.__init__( |
| self, "Clock offset corrector", |
| gr.io_signature(1, 1, gr.sizeof_gr_complex*1), |
| gr.io_signature(1, 1, gr.sizeof_gr_complex*1), |
| ) |
| |
| ################################################## |
| # Parameters |
| ################################################## |
| self.ppm = ppm |
| self.samp_rate = samp_rate |
| self.fc = fc |
| |
| ################################################## |
| # Blocks |
| ################################################## |
| self.ppm_msg = None;self.message_port_register_hier_out("ppm") |
| self.gsm_controlled_rotator_cc_0 = gsm.controlled_rotator_cc(0,samp_rate) |
| self.gsm_controlled_const_source_f_0 = gsm.controlled_const_source_f(ppm) |
| self.fractional_resampler_xx_0 = filter.fractional_resampler_cc(0, 1) |
| self.blocks_multiply_const_vxx_0_0 = blocks.multiply_const_vff((1.0/1.0e6, )) |
| self.blocks_multiply_const_vxx_0 = blocks.multiply_const_vff((fc/samp_rate*(2*math.pi), )) |
| self.blocks_add_const_vxx_0 = blocks.add_const_vff((1, )) |
| |
| ################################################## |
| # Connections |
| ################################################## |
| self.connect((self.gsm_controlled_const_source_f_0, 0), (self.blocks_multiply_const_vxx_0_0, 0)) |
| self.connect((self, 0), (self.gsm_controlled_rotator_cc_0, 0)) |
| self.connect((self.blocks_multiply_const_vxx_0_0, 0), (self.blocks_multiply_const_vxx_0, 0)) |
| self.connect((self.blocks_add_const_vxx_0, 0), (self.fractional_resampler_xx_0, 1)) |
| self.connect((self.gsm_controlled_rotator_cc_0, 0), (self.fractional_resampler_xx_0, 0)) |
| self.connect((self.blocks_multiply_const_vxx_0, 0), (self.gsm_controlled_rotator_cc_0, 1)) |
| self.connect((self.blocks_multiply_const_vxx_0_0, 0), (self.blocks_add_const_vxx_0, 0)) |
| self.connect((self.fractional_resampler_xx_0, 0), (self, 0)) |
| |
| ################################################## |
| # Asynch Message Connections |
| ################################################## |
| self.msg_connect(self, "ppm", self.gsm_controlled_const_source_f_0, "constant_msg") |
| |
| |
| def get_ppm(self): |
| return self.ppm |
| |
| def set_ppm(self, ppm): |
| self.ppm = ppm |
| self.gsm_controlled_const_source_f_0.set_constant(self.ppm) |
| |
| def get_samp_rate(self): |
| return self.samp_rate |
| |
| def set_samp_rate(self, samp_rate): |
| self.samp_rate = samp_rate |
| self.blocks_multiply_const_vxx_0.set_k((self.fc/self.samp_rate*(2*math.pi), )) |
| self.gsm_controlled_rotator_cc_0.set_samp_rate(self.samp_rate) |
| |
| def get_fc(self): |
| return self.fc |
| |
| def set_fc(self, fc): |
| self.fc = fc |
| self.blocks_multiply_const_vxx_0.set_k((self.fc/self.samp_rate*(2*math.pi), )) |
| |