Added typical signalization channels (CCCH, BCCH, SDCCH) decoder and demapper for BCCH.
The implementation is quite dirty at this moment.
diff --git a/grc/gsm_control_channels_decoder.xml b/grc/gsm_control_channels_decoder.xml
new file mode 100644
index 0000000..b106ff7
--- /dev/null
+++ b/grc/gsm_control_channels_decoder.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0"?>
+<block>
+ <name>Control channels decoder</name>
+ <key>gsm_control_channels_decoder</key>
+ <category>GSM</category>
+ <import>import gsm</import>
+ <make>gsm.control_channels_decoder()</make>
+ <sink>
+ <name>bursts</name>
+ <type>message</type>
+ </sink>
+<!-- <source>-->
+<!-- <name>msgs_out</name>-->
+<!-- <type>message</type>-->
+<!-- </source>-->
+</block>