diff --git a/demo/fw/integration_test.png b/demo/fw/integration_test.png
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Binary files /dev/null and b/demo/fw/integration_test.png differ
diff --git a/demo/fw/tools/tb_data_encoder.py b/demo/fw/tools/tb_data_encoder.py
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+++ b/demo/fw/tools/tb_data_encoder.py
@@ -0,0 +1,54 @@
+#!/usr/bin/env python3
+
+import sys
+
+import numpy as np
+import click
+import struct
+from PIL import Image
+
+WINDOW_MAGIC = np.array([
+    (0x00, 0x10, 0x20),
+    (0x30, 0x40, 0x50),
+    (0x60, 0x70, 0x80),
+    (0x90, 0xa0, 0xb0),
+    (0xc0, 0xd0, 0xe0),
+    (0xf0, 0x40, 0x20),
+    (0x50, 0x40, 0x30),
+    (0x20, 0x10, 0x00),
+])
+
+def tb_int_to_px(val):
+    return np.array([(val//0x10000)&0xff, (val//0x100)&0xff, val&0xff], dtype=np.uint8)
+
+@click.command()
+@click.option('-w', '--width', type=int, default=400)
+@click.option('-h', '--height', type=int, default=300)
+@click.argument('input_file', type=click.File('rb'))
+@click.argument('output_file', type=click.Path(dir_okay=False, writable=True))
+def tb_data_encode(width, height, input_file, output_file):
+    data = input_file.read()
+    data = struct.pack('>I', len(data)) + data
+    data = np.frombuffer(data, dtype=np.uint8)
+
+    data_expanded = np.repeat(data, 2).reshape((-1, 2))
+    data_expanded[:, 0] &= 0xf0
+    data_expanded[:, 1] = (data_expanded[:, 1] & 0x0f) << 4
+    data_expanded = data_expanded.flatten()
+
+    win = np.zeros([height*width*3], dtype=np.uint8)
+    win[12*3:12*3+len(data_expanded)] = data_expanded
+    win = win.reshape((height, width, 3))
+
+    win[0, :8] = WINDOW_MAGIC
+    win[0, 8] = tb_int_to_px(0)
+    win[0, 9] = tb_int_to_px(0)
+    win[0, 10] = tb_int_to_px(width)
+    win[0, 11] = tb_int_to_px(height)
+    
+    print('out:', ' '.join(f'{x:02x}' for x in win.flatten()[:256]))
+
+    Image.fromarray(win).save(output_file)
+
+if __name__ == '__main__':
+    tb_data_encode()