dmr updates

op25/gr-op25_repeater/apps/tx/dmr-cfg.dat

@@ -0,0 +1,73 @@
+#################################################################################
+#
+# config file for DMR BS TX 
+#
+#################################################################################
+# 
+# DMR Encoder (C) Copyright 2017 Max H. Parke KA1RBI
+# 
+# This file is part of OP25
+# 
+# This 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.
+# 
+# This software 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 this software; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#################################################################################
+#
+# NOTE 
+#
+# Everything in this file is doubled up due to the two slot TDMA.
+#
+# For example "en1" is for slot 1 and "en2" is for slot 2
+#
+# Syntax is unforgiving - no whitespace allowed (outside of comments)
+#
+#
+#################################################################################
+#
+# slot enable [1 bit: 0=disable; 1=enable]
+# - transmits voice sync when enabled, idle slot sync when disabled
+# - the GR block consumes input samples on both channels (whether or not enabled)
+#
+en1=1
+en2=1
+#################################################################################
+#
+# color code [4 bits]
+#
+cc1=1
+cc2=1
+#################################################################################
+#
+# Activity Update
+# - source: spec volume 2 para 7.1.3.2
+# - specify the hashed address [8 bits]
+# - compressed destination address 1 and destination address 2
+# - typically set to zero [?]
+#
+ts1=0
+ts2=0
+#################################################################################
+#
+# Group Voice Channel User LC PDU
+# - source: spec volume 2 paragraph 7.1.1.1
+# - the so/ga/sa (Service Options/[talk]Group Address/Source Address)
+# - values are specified in decimal [so: 8 bits; sa and ga: 24 bits]
+# - service options are typically set to zero [?]
+#
+so1=0
+so2=0
+ga1=1
+ga2=311
+sa1=1
+sa2=1

op25/gr-op25_repeater/apps/tx/op25_c4fm_mod.py

@@ -76,6 +76,18 @@ def transfer_function_tx():
 		xfer.append(pf * hf)
 	return xfer
 
+def transfer_function_dmr():
+	xfer = []	# frequency domain transfer function
+	for f in xrange(0, 2881):	# specs cover 0 - 2,880 Hz
+		if f < 1920:
+			hf = 1.0
+		else:
+			hf = 0.5 + 0.5 * cos (2 * pi * float(f) / 1920.0)
+		xfer.append(hf)
+	xfer = np.array(xfer, dtype=np.float64)
+	xfer = np.sqrt(xfer)	# root cosine
+	return xfer
+
 class c4fm_taps(object):
 	"""Generate filter coefficients as per P25 C4FM spec"""
 	def __init__(self, filter_gain = 1.0, sample_rate=_def_output_sample_rate, symbol_rate=_def_symbol_rate, span=_def_span, generator=transfer_function_tx):
@@ -106,6 +118,7 @@ class p25_mod_bf(gr.hier_block2):
                  output_sample_rate=_def_output_sample_rate,
                  reverse=_def_reverse,
                  verbose=_def_verbose,
+                 generator=transfer_function_tx,
                  log=_def_log):
         """
 	Hierarchical block for RRC-filtered P25 FM modulation.
@@ -143,7 +156,9 @@ class p25_mod_bf(gr.hier_block2):
         else:
             self.polarity = blocks.multiply_const_ff( 1)
 
-        self.filter = filter.interp_fir_filter_fff(self._interp_factor, c4fm_taps(sample_rate=output_sample_rate).generate())
+        self.generator = generator
+
+        self.filter = filter.interp_fir_filter_fff(self._interp_factor, c4fm_taps(sample_rate=output_sample_rate, generator=self.generator).generate())
 
         if verbose:
             self._print_verbage()

op25/gr-op25_repeater/lib/dmr_bs_tx_bb_impl.cc

@@ -119,17 +119,20 @@ static void encode_embedded(const uint8_t lc[72], uint8_t result[32*4]) {
 	for (int i=0; i<9; i++) {
 		csum += load_i(&lc[i*8], 8);
 	}
+	csum = csum % 31;
+	for (int i=0; i<7; i++) {
+		memcpy(&encode[16*i], &lc[s_index], lengths[i]);
+		s_index += lengths[i];
+	}
 	for (int i=0; i<5; i++) {
 		encode[(i+2)*16+10] = (csum >> (4-i)) & 1;
 	}
 	for (int i=0; i<7; i++) {
-		memcpy(&encode[16*i], &lc[s_index], lengths[i]);
-		int acc = load_i(&lc[s_index], 11);
+		int acc = load_i(&encode[16*i], 11);
 		acc = hamming_16_11[acc];
 		for (int j=0; j<5; j++){
 			encode[i*16+j+11] = (acc >> (4-j)) & 1;
 		}
-		s_index += lengths[i];
 	}
 	for (int i=0; i<16; i++) {
 		encode[7*16+i] = (encode[0*16+i] + encode[1*16+i] + encode[2*16+i] + \
@@ -277,12 +280,12 @@ dmr_bs_tx_bb_impl::config()
 	}
 	for (;;) {
 		cp = fgets(line, sizeof(line) - 2, fp1);
+		if (!cp) break;
 		if (line[0] == '#') continue;
 		// cach: hashed addr ts1(8) and hashed addr ts2(8)
 		// emb: (one per ch) cc(4)
 		// group voice channel user PDU: service options (8), group address(24), source address(24)
 		// (one per ch)
-		if (!cp) break;
 		if (memcmp(line, "ts1=", 4) == 0)
 			sscanf(&line[4], "%d", &d_ts[0]);
 		else if (memcmp(line, "ts2=", 4) == 0)
@@ -416,7 +419,7 @@ dmr_bs_tx_bb_impl::general_work (int noutput_items,
     // -1: RC
     // 0|1|2|3: segment no. of embedded signalling
     {-2, 0, 1, -1, 2, 3},
-    {-2, 0, 1, 2, 3, -1}
+    {-1, 2, 3, -2, 0, 1}
   };
 
   int nconsumed[2] = {0,0};