7 files changed, 85 insertions, 37 deletions
diff --git a/src/gr-fadingui/grc/CMakeLists.txt b/src/gr-fadingui/grc/CMakeLists.txt
index 98713e8..1fe2b9c 100644
--- a/src/gr-fadingui/grc/CMakeLists.txt
+++ b/src/gr-fadingui/grc/CMakeLists.txt
@@ -19,5 +19,6 @@
 # Boston, MA 02110-1301, USA.
 install(FILES
     fadingui_datasource.block.yml
-    fadingui_dearpygui_sink.block.yml DESTINATION share/gnuradio/grc/blocks
+    fadingui_dearpygui_sink.block.yml
+    fadingui_xor_frame_sync.block.yml DESTINATION share/gnuradio/grc/blocks
 )
diff --git a/src/gr-fadingui/grc/fadingui_xor_frame_sync.block.yml b/src/gr-fadingui/grc/fadingui_xor_frame_sync.block.yml
new file mode 100644
index 0000000..92be2a8
--- /dev/null
+++ b/src/gr-fadingui/grc/fadingui_xor_frame_sync.block.yml
@@ -0,0 +1,45 @@
+id: fadingui_xor_frame_sync
+label: xor_frame_sync
+category: '[fadingui]'
+
+templates:
+  imports: import fadingui
+  make: fadingui.xor_frame_sync()
+
+#  Make one 'parameters' list entry for every parameter you want settable from the GUI.
+#     Keys include:
+#     * id (makes the value accessible as \$keyname, e.g. in the make entry)
+#     * label (label shown in the GUI)
+#     * dtype (e.g. int, float, complex, byte, short, xxx_vector, ...)
+parameters:
+- id: ...
+  label: ...
+  dtype: ...
+- id: ...
+  label: ...
+  dtype: ...
+
+#  Make one 'inputs' list entry per input and one 'outputs' list entry per output.
+#  Keys include:
+#      * label (an identifier for the GUI)
+#      * domain (optional - stream or message. Default is stream)
+#      * dtype (e.g. int, float, complex, byte, short, xxx_vector, ...)
+#      * vlen (optional - data stream vector length. Default is 1)
+#      * optional (optional - set to 1 for optional inputs. Default is 0)
+inputs:
+- label: ...
+  domain: ...
+  dtype: ...
+  vlen: ...
+  optional: ...
+
+outputs:
+- label: ...
+  domain: ...
+  dtype: ...
+  vlen: ...
+  optional: ...
+
+#  'file_format' specifies the version of the GRC yml format used in the file
+#  and should usually not be changed.
+file_format: 1
diff --git a/src/gr-fadingui/python/CMakeLists.txt b/src/gr-fadingui/python/CMakeLists.txt
index 27b5f4b..4845bd9 100644
--- a/src/gr-fadingui/python/CMakeLists.txt
+++ b/src/gr-fadingui/python/CMakeLists.txt
@@ -33,7 +33,8 @@ GR_PYTHON_INSTALL(
     FILES
     __init__.py
     datasource.py
-    dearpygui_sink.py DESTINATION ${GR_PYTHON_DIR}/fadingui
+    dearpygui_sink.py
+    xor_frame_sync.py DESTINATION ${GR_PYTHON_DIR}/fadingui
 )
 
 ########################################################################
diff --git a/src/gr-fadingui/python/__init__.py b/src/gr-fadingui/python/__init__.py
index d551a71..f62e3cf 100644
--- a/src/gr-fadingui/python/__init__.py
+++ b/src/gr-fadingui/python/__init__.py
@@ -34,5 +34,6 @@ except ImportError:
 # import any pure python here
 from .datasource import datasource
 from .dearpygui_sink import dearpygui_sink
+from .xor_frame_sync import xor_frame_sync
 
 #
diff --git a/src/gr-fadingui/python/datasource.py b/src/gr-fadingui/python/datasource.py
index 1914d33..764b4d5 100644
--- a/src/gr-fadingui/python/datasource.py
+++ b/src/gr-fadingui/python/datasource.py
@@ -1,23 +1,7 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 #
-# Copyright 2021 Naoki Pross, Sara Halter.
-#
-# 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.
-#
+# Copyright 2021 Naoki Pross.
 
 import io
 
@@ -60,23 +44,27 @@ class datasource(gr.sync_block):
         self.fdata = np.fromfile(fname, np.byte)
         self.fsize = len(self.fdata)
 
-        # TODO: remove debugging statements
+        # TODO: remove debugging statements or create logger
         print(f"datasource: loaded file size={self.fsize}, head:")
         print(self.fdata[:10])
 
     def make_header(self, data_size):
         # TODO: check that data_size is not too big
         pilot = 0x1248
+
+        # TODO: implement hamming code for header
         header = f"p{pilot:04x}s{data_size:04x}d".encode("ascii")
+
         arr = np.frombuffer(header, dtype=np.dtype("byte"))
         return arr
 
     def work(self, input_items, output_items):
         out = output_items[0]
-        print(self.fpos)
 
         if self.fpos + self.vec_len > self.fsize:
             # FIXME: repair broken code below
+            # TODO: create logger
+            print(f"WARNING: the last {self.fsize - self.fpos} bytes were not sent!")
             self.fpos = 0
             return 0;
 
@@ -92,6 +80,7 @@ class datasource(gr.sync_block):
             self.fpos = 0
             return rest
 
+        # cache header if not saved
         if self.header_cache == None:
             self.header = self.make_header(self.vec_len)
 
diff --git a/src/gr-fadingui/python/dearpygui_sink.py b/src/gr-fadingui/python/dearpygui_sink.py
index bca780d..6153611 100644
--- a/src/gr-fadingui/python/dearpygui_sink.py
+++ b/src/gr-fadingui/python/dearpygui_sink.py
@@ -2,22 +2,6 @@
 # -*- coding: utf-8 -*-
 #
 # Copyright 2021 Naoki Pross.
-#
-# 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.
-#
 
 import socket
 from urllib.parse import urlparse
diff --git a/src/gr-fadingui/python/xor_frame_sync.py b/src/gr-fadingui/python/xor_frame_sync.py
new file mode 100644
index 0000000..9d9064f
--- /dev/null
+++ b/src/gr-fadingui/python/xor_frame_sync.py
@@ -0,0 +1,27 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+# Copyright 2021 Naoki Pross.
+
+
+import numpy
+from gnuradio import gr
+
+class xor_frame_sync(gr.sync_block):
+    """
+    docstring for block xor_frame_sync
+    """
+    def __init__(self, sync_pattern):
+        gr.sync_block.__init__(self,
+            name="xor_frame_sync",
+            in_sig=[np.byte],
+            out_sig=[np.byte])
+
+    def work(self, input_items, output_items):
+        inp = input_items[0]
+        out = output_items[0]
+
+        out[:] = inp
+
+        return len(output_items[0])
+