Added preconfigured demapper blocks that wrap universal ctrl chans demapper
diff --git a/grc/demapping/gsm_sdcch8_demapper.xml b/grc/demapping/gsm_sdcch8_demapper.xml
new file mode 100644
index 0000000..38a8112
--- /dev/null
+++ b/grc/demapping/gsm_sdcch8_demapper.xml
@@ -0,0 +1,45 @@
+<?xml version="1.0"?>
+<block>
+ <name>SDCCH/8 demapper</name>
+ <key>gsm_sdcch8_demapper</key>
+ <import>import grgsm</import>
+ <make>grgsm.universal_ctrl_chans_demapper($timeslot_nr, $starts_fn_mod51, $channel_types)</make>
+
+ <param>
+ <name>Timeslot</name>
+ <key>timeslot_nr</key>
+ <value>1</value>
+ <type>int</type>
+ <hide>none</hide>
+ </param>
+
+ <param>
+ <name>starts_fn_mod51</name>
+ <key>starts_fn_mod51</key>
+ <value>[0,4,8,12,16,20,24,28,32,36,40,44]</value>
+ <type>int_vector</type>
+ <hide>all</hide>
+ </param>
+
+ <param>
+ <name>channel_types</name>
+ <key>channel_types</key>
+ <value>[8,8,8,8,8,8,8,8,136,136,136,136]</value>
+ <type>int_vector</type>
+ <hide>all</hide>
+ </param>
+
+ <sink>
+ <name>bursts</name>
+ <type>message</type>
+ </sink>
+ <source>
+ <name>bursts</name>
+ <type>message</type>
+ </source>
+
+ <doc>
+ Demapper for SDCCH/8 + SACCH/C8 control channels.
+ This corresponds to channel combination vii specified in GSM 05.02, section 6.4
+ </doc>
+</block>
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