begin documenting the project, README

reverse_engineering/decode.py

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+import os
+from PIL import Image
+import sys
+import glob
+
+os.makedirs("decodedImg", exist_ok=True)
+
+for in_file in glob.glob("data/data*.txt"):
+    cmds = []
+    with open(in_file, "r") as file:
+        data = file.read().split('\n')
+        data = [d.strip() for d in data if len(d)>0]
+        binary = []
+        for d in data:
+            binary.extend(bytes.fromhex(d)) 
+
+        idx = -1
+        data = []
+        cmdCode = 0x00
+        dataLen = 0
+        crc = 0x00
+        for i, b in enumerate(binary):
+            idx += 1
+            #print(i, idx, hex(b))
+            if b == 0x51 and idx == 0:
+                pass
+            elif b == 0x78 and idx == 1:
+                pass
+            elif idx == 2:
+                cmdCode = b
+            elif b == 0x00 and idx == 3:
+                pass
+            elif idx == 4:
+                dataLen = b
+            elif idx == 5:
+                if b != 0:
+                    dataLen = dataLen*0x100 + b
+            elif idx >= 6 and idx < 6+dataLen:
+                data.append(b)
+            elif idx == 6+dataLen:
+                crc = b
+            elif idx == 6+dataLen+1 and b == 0xFF:
+                o = {
+                    "cmd": cmdCode,
+                    "data": data,
+                    "crc": crc
+                }
+                cmds.append(o)
+                idx = -1
+                crc = 0
+                data = []
+                cmdCode = 0
+            else:
+                idx = -1
+                crc = 0
+                data = []
+                cmdCode = 0
+        #print(cmds)
+        #for c in cmds:
+        #    print(hex(c["cmd"]), hex(len(c["data"])), hex(c["crc"]))
+
+    rows = []
+    for c in cmds:
+        if c["cmd"] == 0xa2:
+            s = "".join([bin(b)[2:10].zfill(8)[::-1] for b in c["data"]]) 
+            row = [int(x)==1 for x in s]
+            rows.append(row)
+        elif c["cmd"] == 0xbf:
+            row = []
+            for b in c["data"]:
+                bit = (b & (1<<7)) == 128
+                times = b & ~(1<<7)
+                row.extend([bit] * times)
+            rows.append(row)
+
+    HEIGHT = len(rows)
+    WIDTH = max(len(r) for r in rows)
+
+    img = Image.new("1", (WIDTH, HEIGHT))
+    for y in range(HEIGHT):
+        for x in range(WIDTH):
+            img.putpixel((x,y), not rows[y][x])
+
+    base = in_file.split('\\')[-1].split('.')[0]  # Get base name without extension
+    output_file = f"decodedImg/{base}.png"
+    img.save(output_file)