Added new blocks for clock freqeuncy correction
diff --git a/grc/gsm_clock_offset_corrector.xml b/grc/gsm_clock_offset_corrector.xml
new file mode 100644
index 0000000..e9aa7db
--- /dev/null
+++ b/grc/gsm_clock_offset_corrector.xml
@@ -0,0 +1,50 @@
+<?xml version='1.0' encoding='ASCII'?>
+<block>
+ <name>Clock offset corrector</name>
+ <key>clock_offset_corrector</key>
+ <category>GSM</category>
+ <import>execfile("/home/piotr/.grc_gnuradio/clock_offset_corrector.py")</import>
+ <make>clock_offset_corrector(
+ ppm=$ppm,
+ samp_rate=$samp_rate,
+ fc=$fc,
+)</make>
+ <callback>set_ppm($ppm)</callback>
+ <callback>set_samp_rate($samp_rate)</callback>
+ <callback>set_fc($fc)</callback>
+ <param>
+ <name>ppm</name>
+ <key>ppm</key>
+ <value>0</value>
+ <type>raw</type>
+ </param>
+ <param>
+ <name>samp_rate</name>
+ <key>samp_rate</key>
+ <value>1625000.0/6.0*4.0</value>
+ <type>raw</type>
+ </param>
+ <param>
+ <name>fc</name>
+ <key>fc</key>
+ <value>936.6e6</value>
+ <type>raw</type>
+ </param>
+ <sink>
+ <name>in</name>
+ <type>complex</type>
+ <vlen>1</vlen>
+ </sink>
+ <sink>
+ <name>ppm_msg</name>
+ <type>message</type>
+ <optional>True</optional>
+ </sink>
+ <source>
+ <name>out</name>
+ <type>complex</type>
+ <vlen>1</vlen>
+ </source>
+ <doc>Piotr Krysik
+ <grc_source>gr-gsm/examples/clock_offset_corrector.grc</grc_source>
+</block>