new experimental daughterboards with other tuners

git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@8687 221aa14e-8319-0410-a670-987f0aec2ac5

1 files changed, 203 insertions, 0 deletions

diff --git a/gr-usrp/src/db_dtt768.py b/gr-usrp/src/db_dtt768.py
new file mode 100644
index 000000000..dd342bd20
--- /dev/null
+++ b/gr-usrp/src/db_dtt768.py
@@ -0,0 +1,203 @@
+#
+# 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_4():
+    C = 0   # Charge Pump Current, no info on how to choose
+    R = 4   # 125 kHz fref
+    
+
+    ATP = 7  # Disable internal AGC
+    return 0x80 | C<<5 | R
+
+def control_byte_5(freq,agcmode = 1):
+    if(agcmode):
+        if freq < 150e6:
+            return 0x3B
+        elif freq < 420e6:
+            return 0x7E
+        else:
+            return 0xB7
+    else:
+        if freq < 150e6:
+            return 0x39
+        elif freq < 420e6:
+            return 0x7C
+        else:
+            return 0xB5
+        
+def control_byte_6():
+    ATC = 0   # AGC time constant = 100ms, 1 = 3S
+    IFE = 1   # IF AGC amplifier enable
+    AT = 0    # AGC control, ???
+    
+    return ATC << 5 | IFE << 4 | AT
+
+def control_byte_7():
+    SAS = 1  # SAW Digital mode
+    AGD = 1  # AGC disable
+    ADS = 0  # AGC detector into ADC converter
+    T = 0    # Test mode, undocumented
+    return SAS << 7 | AGD << 5 | ADS << 4 | T
+
+class db_dtt768(db_base.db_base):
+    def __init__(self, usrp, which):
+        """
+        Control custom DTT76803-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._IF = 44e6
+        
+        self.f_ref = 125e3
+        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] * 6
+        buf[0] = (divisor >> 8) & 0xff          # DB1
+        buf[1] = divisor & 0xff                 # DB2
+        buf[2] = control_byte_4()
+        buf[3] = control_byte_5(target_freq)
+        buf[4] = control_byte_6()
+        buf[5] = control_byte_7()
+
+        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
+
+# hook this daughterboard class into the auto-instantiation framework
+
+# With DTT76803
+db_instantiator.add(usrp_dbid.DTT768,
+                    lambda usrp, which : (db_dtt768(usrp, which),))