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Diffstat (limited to 'gr-usrp/src/db_dtt754.py')
| -rw-r--r-- | gr-usrp/src/db_dtt754.py | 229 |
1 files changed, 0 insertions, 229 deletions
diff --git a/gr-usrp/src/db_dtt754.py b/gr-usrp/src/db_dtt754.py deleted file mode 100644 index 019eae6a59..0000000000 --- a/gr-usrp/src/db_dtt754.py +++ /dev/null @@ -1,229 +0,0 @@ -# -# Copyright 2005 Free Software Foundation, Inc. -# -# This file is part of GNU Radio -# -# GNU Radio is free software; you can redistribute it and/or modify -# it under the terms of the GNU General Public License as published by -# the Free Software Foundation; either version 3, or (at your option) -# any later version. -# -# GNU Radio is distributed in the hope that it will be useful, -# but WITHOUT ANY WARRANTY; without even the implied warranty of -# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -# GNU General Public License for more details. -# -# You should have received a copy of the GNU General Public License -# along with GNU Radio; see the file COPYING. If not, write to -# the Free Software Foundation, Inc., 51 Franklin Street, -# Boston, MA 02110-1301, USA. -# - -__all__ = ['tv_rx'] - -import math -from usrpm import usrp_dbid -import db_base -import db_instantiator - -def int_seq_to_str(seq): - """convert a sequence of integers into a string""" - return ''.join (map (chr, seq)) - -def str_to_int_seq(str): - """convert a string to a list of integers""" - return map (ord, str) - -def control_byte_1(): - RS = 0 # 0 = 166.66kHz reference - ATP = 7 # Disable internal AGC - return 0x80 | ATP<<3 | RS - -def control_byte_2(): - STBY = 0 # powered on - XTO = 1 # turn off xtal out, which we don't have - ATC = 0 # not clear exactly, possibly speeds up or slows down AGC, which we are not using - - c = 0xc2 | ATC<<5 | STBY<<4 | XTO - return c - -def bandswitch_byte(freq,bw): - if(bw>7.5e6): - P5 = 1 - else: - P5 = 0 - - if freq < 121e6: - CP = 0 - BS = 1 - elif freq < 141e6: - CP = 1 - BS = 1 - elif freq < 166e6: - CP = 2 - BS = 1 - elif freq < 182e6: - CP = 3 - BS = 1 - elif freq < 286e6: - CP = 0 - BS = 2 - elif freq < 386e6: - CP = 1 - BS = 2 - elif freq < 446e6: - CP = 2 - BS = 2 - elif freq < 466e6: - CP = 3 - BS = 2 - elif freq < 506e6: - CP = 0 - BS = 8 - elif freq < 761e6: - CP = 1 - BS = 8 - elif freq < 846e6: - CP = 2 - BS = 8 - else: # limit is ~905 MHz - CP = 3 - BS = 8 - return CP<<6 | P5 << 4 | BS - -class db_dtt754(db_base.db_base): - def __init__(self, usrp, which): - """ - Control custom DTT75403-based daughterboard. - - @param usrp: instance of usrp.source_c - @param which: which side: 0 or 1 corresponding to RX_A or RX_B respectively - @type which: int - """ - # sets _u and _which - db_base.db_base.__init__(self, usrp, which) - - self._i2c_addr = (0x60, 0x62)[which] - self.bw = 7e6 - self._IF = 36e6 - - self.f_ref = 166.6666e3 - self._inverted = False - - g = self.gain_range() # initialize gain - self.set_gain(float(g[0]+g[1]) / 2) - - self.bypass_adc_buffers(False) - - # Gain setting - def _set_rfagc(self,gain): - assert gain <= 60 and gain >= 0 - # FIXME this has a 0.5V step between gain = 60 and gain = 59. - # Why are there two cases instead of a single linear case? - if gain == 60: - voltage = 4 - else: - voltage = gain/60.0 * 2.25 + 1.25 - dacword = int(4096*voltage/1.22/3.3) # 1.22 = opamp gain - - assert dacword>=0 and dacword<4096 - self._u.write_aux_dac(self._which, 1, dacword) - - def _set_ifagc(self,gain): - assert gain <= 35 and gain >= 0 - voltage = gain/35.0 * 2.1 + 1.4 - dacword = int(4096*voltage/1.22/3.3) # 1.22 = opamp gain - - assert dacword>=0 and dacword<4096 - self._u.write_aux_dac(self._which, 0, dacword) - - def _set_pga(self,pga_gain): - assert pga_gain >=0 and pga_gain <=20 - if(self._which == 0): - self._u.set_pga (0, pga_gain) - else: - self._u.set_pga (2, pga_gain) - - def gain_range(self): - return (0, 115, 1) - - def set_gain(self,gain): - assert gain>=0 and gain<=115 - if gain>60: - rfgain = 60 - gain = gain - 60 - else: - rfgain = gain - gain = 0 - if gain > 35: - ifgain = 35 - gain = gain - 35 - else: - ifgain = gain - gain = 0 - pgagain = gain - self._set_rfagc(rfgain) - self._set_ifagc(ifgain) - self._set_pga(pgagain) - - def freq_range(self): - return (44e6, 900e6, 10e3) - - def set_freq(self, target_freq): - """ - @returns (ok, actual_baseband_freq) where: - ok is True or False and indicates success or failure, - actual_baseband_freq is the RF frequency that corresponds to DC in the IF. - """ - r = self.freq_range() - if target_freq < r[0] or target_freq > r[1]: - return (False, 0) - - target_lo_freq = target_freq + self._IF; # High side mixing - - divisor = int(0.5+(target_lo_freq / self.f_ref)) - actual_lo_freq = self.f_ref*divisor - - if (divisor & ~0x7fff) != 0: # must be 15-bits or less - return (False, 0) - - # build i2c command string - buf = [0] * 5 - buf[0] = (divisor >> 8) & 0xff # DB1 - buf[1] = divisor & 0xff # DB2 - buf[2] = control_byte_1() - buf[3] = bandswitch_byte(actual_lo_freq,self.bw) - buf[4] = control_byte_2() - - ok = self._u.write_i2c(self._i2c_addr, int_seq_to_str (buf)) - - self.freq = actual_lo_freq - self._IF - - return (ok, actual_lo_freq) - - def is_quadrature(self): - """ - Return True if this board requires both I & Q analog channels. - - This bit of info is useful when setting up the USRP Rx mux register. - """ - return False - - def spectrum_inverted(self): - """ - The 43.75 MHz version is inverted - """ - return self._inverted - - def set_bw(self,bw): - """ - Choose the SAW filter bandwidth, either 7MHz or 8MHz) - """ - self.bw = bw - self.set_freq(self.freq) - -# hook this daughterboard class into the auto-instantiation framework - -# With DTT75403 -db_instantiator.add(usrp_dbid.DTT754, - lambda usrp, which : (db_dtt754(usrp, which),)) |