Added DM image frame generator script

img2dm.py

@@ -0,0 +1,179 @@
+# Converts, compresses and transmits images to dot matrix ESLs
+# 2018 furrtek - furrtek.org
+# See LICENSE
+
+from imageio import imread
+import sys
+
+def record_run(run_count):
+    # Convert to binary
+    del bits[:]
+    while run_count:
+        bits.insert(0, run_count & 1)
+        run_count >>= 1
+    # Zero length coding
+    for b in bits[1:]:
+        compressed.append(0)
+    if len(bits):
+        compressed.extend(bits)
+
+def append_crc(frame):
+    result = 0x8408
+    poly = 0x8408
+
+    for by in frame:
+        result ^= by
+        for bi in range(0, 8):
+            if (result & 1):
+                result >>= 1
+                result ^= poly
+            else:
+                result >>= 1
+
+    frame.append(result & 255)
+    frame.append((result / 256) & 255)
+
+def make_mcu_frame(cmd):
+    frame = [0x85, PLID[3], PLID[2], PLID[1], PLID[0], 0x34, 0x00, 0x00, 0x00, cmd]
+    return frame
+
+def append_word(frame, value):
+    frame.append(value / 256)
+    frame.append(value & 255)
+
+def usage():
+    print("Usage:")
+    print("img2dm.py image barcode page x y")
+    print("  image: image file")
+    print("  barcode: 17-character barcode data")
+    print("  page: page number to update (0~15)")
+    print("  x y: top-left position of image")
+    exit()
+
+arg_count = len(sys.argv)
+if arg_count < 4:
+    usage()
+
+# Open image file
+image = imread(sys.argv[1])
+width = image.shape[1]
+height = image.shape[0]
+if width != 208 or height != 112:
+    print("Image should be 208*112 pixels or less.")
+    exit()
+
+# Get PLID
+PLID = [0] * 4
+barcode = sys.argv[2]
+if len(barcode) != 17:
+    usage()
+id_value = int(barcode[2:7]) + (int(barcode[7:12]) << 16)
+PLID[0] = (id_value >> 8) & 0xFF
+PLID[1] = id_value & 0xFF
+PLID[2] = (id_value >> 24) & 0xFF
+PLID[3] = (id_value >> 16) & 0xFF
+
+page = int(sys.argv[3])
+if page < 0 or page > 15:
+    print("Page can only be between 0 and 15.")
+    exit()
+
+if arg_count > 4:
+    pos_x = int(sys.argv[4])
+else:
+    pos_x = 0
+if arg_count > 5:
+    pos_y = int(sys.argv[5])
+else:
+    pos_y = 0
+
+pixels = []
+compressed = []
+bits = []
+
+size_raw = width * height
+
+for row in image:
+    for rgb in row:
+        pixels.append(int(round((0.21 * rgb[0] + 0.72 * rgb[1] + 0.07 * rgb[2]) / 255)))
+
+print("Compressing %i pixels..." % len(pixels))
+
+# First pixel
+run_pixel = pixels[0]
+run_count = 1
+compressed.append(run_pixel)
+c = 0
+for pixel in pixels[1:]:
+    if pixel == run_pixel:
+        # Add to count
+        run_count += 1
+    else:
+        record_run(run_count)
+
+        run_count = 1
+        run_pixel = pixel
+
+# Record last run
+if run_count > 1:
+    record_run(run_count)
+
+size_compressed = len(compressed)
+
+if size_compressed < size_raw:
+    print("Compression ratio: %.1f%%" % (100 - ((size_compressed * 100) / float(size_raw))))
+    data = compressed
+    compression_type = 2
+else:
+    print("Compression ratio suxx, using raw mode")
+    data = pixels
+    compression_type = 0
+
+# Pad to multiple of bits_per_frame
+bits_per_frame = 20 * 8
+padding = bits_per_frame - (len(data) % bits_per_frame)
+for b in range(0, padding):
+    data.append(0)
+
+data_size = len(data)
+frame_count = data_size / bits_per_frame
+
+print("Generating %i frames..." % frame_count)
+
+frames = []
+
+# Parameters frame
+frame = make_mcu_frame(0x05)
+byte_count = data_size / 8
+append_word(frame, byte_count)
+frame.append(0x00)
+frame.append(compression_type)
+frame.append(0x01)   # PAGE !
+append_word(frame, width)
+append_word(frame, height)
+append_word(frame, pos_x)
+append_word(frame, pos_y)
+frame.extend([0x00, 0x00, 0x88, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00])
+append_crc(frame)
+frames.append(frame)
+
+i = 0
+for fr in range(0, frame_count):
+    frame = make_mcu_frame(0x20)
+    append_word(frame, fr)
+    for by in range(0, 20):
+        v = 0
+        for bi in range(0, 8):
+            v <<= 1
+            v += data[i + bi]
+        frame.append(v)
+        i += 8
+    append_crc(frame)
+    frames.append(frame)
+
+f = open("out.txt", "w")    # DEBUG
+
+for fr in frames:
+    for b in fr:
+        f.write(format(b, '02X') + " ")
+    f.write("\n")