Implemented burst sdcch subslot filter. Issue #100
diff --git a/grc/flow_control/gsm_burst_sdcch_subslot_filter.xml b/grc/flow_control/gsm_burst_sdcch_subslot_filter.xml
new file mode 100644
index 0000000..81ae287
--- /dev/null
+++ b/grc/flow_control/gsm_burst_sdcch_subslot_filter.xml
@@ -0,0 +1,44 @@
+<?xml version="1.0"?>
+<block>
+ <name>Burst SDCCH subslot filter</name>
+ <key>gsm_burst_sdcch_subslot_filter</key>
+ <import>import grgsm</import>
+ <make>grgsm.burst_sdcch_subslot_filter($mode, $subslot)</make>
+
+ <param>
+ <name>Mode</name>
+ <key>mode</key>
+ <type>enum</type>
+ <option>
+ <name>SDCCH/8</name>
+ <key>grgsm.SS_FILTER_SDCCH8</key>
+ </option>
+ <option>
+ <name>SDCCH/4</name>
+ <key>grgsm.SS_FILTER_SDCCH4</key>
+ </option>
+ </param>
+
+ <param>
+ <name>Subslot</name>
+ <key>subslot</key>
+ <value>0</value>
+ <type>int</type>
+ <hide>none</hide>
+ </param>
+
+ <sink>
+ <name>in</name>
+ <type>message</type>
+ </sink>
+
+ <source>
+ <name>out</name>
+ <type>message</type>
+ <optional>1</optional>
+ </source>
+
+ <doc>
+This block forwards only bursts in the subslot given by the parameter
+ </doc>
+</block>
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