diff --git a/convert_img.py b/convert_img.py
index 41d815e..37abba2 100644
--- a/convert_img.py
+++ b/convert_img.py
@@ -1,226 +1,81 @@
-import os
-from PIL import Image, ImageOps
-
-def image_to_tspl_commands(image_path):
-    """
-    读取图片并转换为 TSPL 打印指令 (bytes)
-    包含: SIZE, GAP, CLS, BITMAP, PRINT
-    """
-    if not os.path.exists(image_path):
-        print(f"错误: 找不到图片 {image_path}")
-        return None
-
-    try:
-        img = Image.open(image_path)
-    except Exception as e:
-        print(f"无法打开图片: {e}")
-        return None
-
-    # 处理透明背景
-    if img.mode in ('RGBA', 'LA') or (img.mode == 'P' and 'transparency' in img.info):
-        alpha = img.convert('RGBA').split()[-1]
-        bg = Image.new("RGBA", img.size, (255, 255, 255, 255))
-        bg.paste(img, mask=alpha)
-        img = bg
-
-    # 目标尺寸: 48mm x 30mm @ 203dpi
-    # 宽度: 48 * 8 = 384 dots
-    # 高度: 30 * 8 = 240 dots
-    MAX_WIDTH = 384
-    MAX_HEIGHT = 240
-    
-    # 1. 强制裁剪/缩放以填满 (Aspect Fill / Cover)
-    # 计算目标比例
-    target_ratio = MAX_WIDTH / MAX_HEIGHT
-    img_ratio = img.width / img.height
-    
-    if img_ratio > target_ratio:
-        # 图片更宽，以高度为基准缩放，然后裁剪宽度
-        new_height = MAX_HEIGHT
-        new_width = int(new_height * img_ratio)
-        img = img.resize((new_width, new_height), Image.Resampling.LANCZOS)
-        # 居中裁剪
-        left = (new_width - MAX_WIDTH) // 2
-        img = img.crop((left, 0, left + MAX_WIDTH, MAX_HEIGHT))
-    else:
-        # 图片更高，以宽度为基准缩放，然后裁剪高度
-        new_width = MAX_WIDTH
-        new_height = int(new_width / img_ratio)
-        img = img.resize((new_width, new_height), Image.Resampling.LANCZOS)
-        # 居中裁剪
-        top = (new_height - MAX_HEIGHT) // 2
-        img = img.crop((0, top, MAX_WIDTH, top + MAX_HEIGHT))
-        
-    target_width, target_height = img.size
-    print(f"图片处理后尺寸 (Cover模式): {target_width}x{target_height}")
-    
-    # 转为二值图
-    # 1. 先转灰度
-    img = img.convert('L')
-    # 2. 二值化 (使用默认的抖动算法)
-    img = img.convert('1')
-    
-    # 构造 BITMAP 数据
-    width_bytes = (target_width + 7) // 8
-    data = bytearray()
-    
-    # 遍历像素生成数据
-    for y in range(target_height):
-        row_bytes = bytearray(width_bytes)
-        for x in range(target_width):
-            pixel = img.getpixel((x, y))
-            
-            # 逻辑修正:
-            # 我们希望 黑色像素(0) -> 打印(1)
-            # 白色像素(255) -> 不打印(0)
-            # 使用 < 128 判定，增加容错性，防止像素值偏移
-            
-            should_print = False
-            if pixel < 128: # Black or Dark Gray
-                should_print = True
-            
-            if should_print:
-                byte_index = x // 8
-                bit_index = 7 - (x % 8)
-                row_bytes[byte_index] |= (1 << bit_index)
-        
-        data.extend(row_bytes)
-        
-    # 计算居中偏移 (理论上 Cover 模式下偏移为 0)
-    x_offset = (MAX_WIDTH - target_width) // 2
-    y_offset = (MAX_HEIGHT - target_height) // 2
-    
-    # 生成指令
-    cmds = bytearray()
-    
-    # 1. 初始化
-    # CLS
-    cmds.extend(b"CLS\r\n")
-    # SIZE 48 mm, 30 mm
-    cmds.extend(b"SIZE 48 mm, 30 mm\r\n")
-    # GAP 2 mm, 0 mm
-    cmds.extend(b"GAP 2 mm, 0 mm\r\n")
-    # HOME
-    cmds.extend(b"HOME\r\n")
-    
-    # 2. BITMAP
-    # BITMAP x, y, width_bytes, height, mode, data
-    header = f"BITMAP {x_offset},{y_offset},{width_bytes},{target_height},0,".encode('utf-8')
-    cmds.extend(header)
-    cmds.extend(data)
-    cmds.extend(b"\r\n") # BITMAP data 后面通常不需要回车，但有些文档建议加? 不，binary data后紧跟下一个指令
-    # TSPL protocol says: BITMAP ... data ... CR LF is NOT required after data, but next command must start.
-    # Usually it's safer to just send data.
-    
-    # 3. PRINT
-    cmds.extend(b"PRINT 1\r\n")
-    
-    return cmds
-
-def generate_micropython_printer_script(image_path, output_py_path):
-    """
-    保留此函数以兼容现有 workflow，但内部使用新的逻辑
-    """
-    cmds = image_to_tspl_commands(image_path)
-    if not cmds:
-        return
-
-    # 提取 BITMAP 数据部分用于生成脚本 (因为脚本里是用 uart.write 分段发送的)
-    # 为了简单，我们重新解析一下 cmds 或者直接重写这部分逻辑
-    # 但为了脚本的可读性，还是像之前一样生成
-    
-    # 重新执行一遍核心逻辑来获取参数 (为了生成漂亮的 python 代码)
-    if not os.path.exists(image_path): return
-    img = Image.open(image_path)
-    if img.mode in ('RGBA', 'LA') or (img.mode == 'P' and 'transparency' in img.info):
-        alpha = img.convert('RGBA').split()[-1]
-        bg = Image.new("RGBA", img.size, (255, 255, 255, 255))
-        bg.paste(img, mask=alpha)
-        img = bg
-        
-    MAX_WIDTH = 384
-    MAX_HEIGHT = 240
-    img.thumbnail((MAX_WIDTH, MAX_HEIGHT), Image.Resampling.LANCZOS)
-    target_width, target_height = img.size
-    img = img.convert('L').convert('1')
-    
-    width_bytes = (target_width + 7) // 8
-    data = bytearray()
-    for y in range(target_height):
-        row_bytes = bytearray(width_bytes)
-        for x in range(target_width):
-            if img.getpixel((x, y)) == 0:
-                byte_index = x // 8
-                bit_index = 7 - (x % 8)
-                row_bytes[byte_index] |= (1 << bit_index)
-        data.extend(row_bytes)
-        
-    x_offset = (MAX_WIDTH - target_width) // 2
-    y_offset = (MAX_HEIGHT - target_height) // 2
-    
-    hex_data = data.hex()
-    
-    script_content = f'''from machine import UART
 import time
+from machine import UART
 from config import ttl_tx, ttl_rx
 from printer_driver import TsplPrinter
-import ubinascii
 
-# ==============================================================================
-# 图片打印脚本 (自动生成)
-# ==============================================================================
-# 图片来源: {image_path}
-# ==============================================================================
-
-# 1. 初始化
-uart = UART(1, baudrate=115200, tx=ttl_tx, rx=ttl_rx)
-printer = TsplPrinter(uart)
-
-def print_image():
-    print("=== 开始打印图片 ===")
+def print_bitmap(printer, data, width, height, x_offset=0, y_offset=0):
+    """
+    发送位图数据到打印机
+    :param printer: TsplPrinter 对象
+    :param data: 位图数据 (bytes), 每一位代表一个像素 (1=print/黑, 0=no print/白)
+    :param width: 图像宽度 (dots)
+    :param height: 图像高度 (dots)
+    :param x_offset: X轴偏移
+    :param y_offset: Y轴偏移
+    """
+    width_bytes = (width + 7) // 8
     
-    # 2. 设置标签
-    printer.cls()
-    printer.size(48, 30)
-    printer.gap(2, 0)
-    
-    # 3. 准备图片数据
-    img_hex = "{hex_data}"
-    img_data = ubinascii.unhexlify(img_hex)
-    
-    # 4. 发送 BITMAP 指令
-    print(f"正在发送图片数据 ({{len(img_data)}} bytes)...")
-    
-    # BITMAP X, Y, width_bytes, height, mode, data
-    # 居中打印
-    cmd = f"BITMAP {x_offset},{y_offset},{width_bytes},{target_height},0,".encode('utf-8')
-    uart.write(cmd)
+    # TSPL BITMAP 指令
+    # BITMAP x, y, width_bytes, height, mode, data
+    # mode=0: 正常模式
+    header = f"BITMAP {x_offset},{y_offset},{width_bytes},{height},0,".encode('utf-8')
+    printer.uart.write(header)
     
+    # 分段发送数据，防止串口缓冲区溢出
     chunk_size = 128
-    for i in range(0, len(img_data), chunk_size):
-        uart.write(img_data[i : i + chunk_size])
+    for i in range(0, len(data), chunk_size):
+        printer.uart.write(data[i : i + chunk_size])
+        # 简单的流控，防止发送太快
         time.sleep(0.005)
         
-    uart.write(b'\\r\\n')
+    printer.uart.write(b'\r\n')
+
+def print_raw_image_file(file_path, width, height):
+    """
+    直接打印存储在文件系统中的原始位图数据 (.bin)
+    该文件应包含预处理好的二进制像素数据 (1 bit per pixel)
     
-    # 5. 打印
+    :param file_path: 文件路径
+    :param width: 图片宽度 (dots)
+    :param height: 图片高度 (dots)
+    """
+    try:
+        with open(file_path, 'rb') as f:
+            data = f.read()
+    except OSError:
+        print(f"错误: 无法打开文件 {file_path}")
+        return
+
+    # 初始化打印机
+    uart = UART(1, baudrate=115200, tx=ttl_tx, rx=ttl_rx)
+    printer = TsplPrinter(uart)
+    
+    print("=== 开始打印图片 ===")
+    
+    # 基础设置
+    printer.cls()
+    printer.size(48, 30) # 默认 48x30mm
+    printer.gap(2, 0)
+    
+    # 计算居中位置 (假设标签纸最大宽度 384 dots, 高度 240 dots)
+    MAX_WIDTH = 384
+    MAX_HEIGHT = 240
+    
+    x_offset = (MAX_WIDTH - width) // 2
+    y_offset = (MAX_HEIGHT - height) // 2
+    
+    if x_offset < 0: x_offset = 0
+    if y_offset < 0: y_offset = 0
+    
+    print(f"正在发送图片数据 ({len(data)} bytes)...")
+    print_bitmap(printer, data, width, height, x_offset, y_offset)
+    
+    # 打印出纸
     printer.print_out(1)
     print("打印完成")
 
+# 示例用法
 if __name__ == "__main__":
-    try:
-        print_image()
-    except Exception as e:
-        print(f"错误: {{e}}")
-'''
-
-    with open(output_py_path, 'w', encoding='utf-8') as f:
-        f.write(script_content)
-    
-    print(f"成功生成 MicroPython 脚本: {output_py_path}")
-
-if __name__ == "__main__":
-    generate_micropython_printer_script(
-        "/Users/jeremygan/Desktop/python_dev/V2_micropython/test_image.png",
-        "/Users/jeremygan/Desktop/python_dev/V2_micropython/printer_image_print.py"
-    )
+    # 假设有一个预处理好的 384x240 的二进制文件
+    # print_raw_image_file("image_data.bin", 384, 240)
+    pass
diff --git a/debug_dither.py b/debug_dither.py
deleted file mode 100644
index 69f14cf..0000000
--- a/debug_dither.py
+++ /dev/null
@@ -1,27 +0,0 @@
-from PIL import Image, ImageDraw
-
-# Create a test image with gray lines
-img = Image.new('L', (100, 100), color=255)
-d = ImageDraw.Draw(img)
-d.line([10, 10, 90, 90], fill=128, width=2) # Gray line
-d.line([10, 90, 90, 10], fill=0, width=2)   # Black line
-
-# Convert with default dithering
-img1 = img.convert('1')
-zeros1 = 0
-for y in range(100):
-    for x in range(100):
-        if img1.getpixel((x, y)) == 0: zeros1 += 1
-print(f"Default dither zeros: {zeros1}")
-
-# Convert with NO dithering (Threshold)
-# Note: convert('1', dither=Image.Dither.NONE) might still do dithering in some versions?
-# The reliable way to threshold is point operation or custom threshold.
-# But let's check convert('1', dither=0)
-img2 = img.convert('1', dither=Image.Dither.NONE)
-zeros2 = 0
-for y in range(100):
-    for x in range(100):
-        if img2.getpixel((x, y)) == 0: zeros2 += 1
-print(f"No dither zeros: {zeros2}")
-
diff --git a/debug_img.py b/debug_img.py
deleted file mode 100644
index 9422239..0000000
--- a/debug_img.py
+++ /dev/null
@@ -1,69 +0,0 @@
-from PIL import Image
-import os
-
-def debug_image(image_path):
-    if not os.path.exists(image_path):
-        print(f"Error: {image_path} not found")
-        return
-
-    img = Image.open(image_path)
-    print(f"Original mode: {img.mode}")
-    
-    # 模拟 convert_img.py 的处理流程
-    if img.mode in ('RGBA', 'LA') or (img.mode == 'P' and 'transparency' in img.info):
-        alpha = img.convert('RGBA').split()[-1]
-        bg = Image.new("RGBA", img.size, (255, 255, 255, 255))
-        bg.paste(img, mask=alpha)
-        img = bg
-    
-    img = img.convert('L')
-    img = img.convert('1')
-    print(f"Converted mode: {img.mode}")
-    
-    width, height = img.size
-    print(f"Size: {width}x{height}")
-    
-    zeros = 0
-    non_zeros = 0
-    values = {}
-    
-    # 采样一些像素
-    for y in range(min(height, 10)):
-        row_vals = []
-        for x in range(min(width, 10)):
-            val = img.getpixel((x, y))
-            row_vals.append(str(val))
-        print(f"Row {y} first 10 pixels: {', '.join(row_vals)}")
-        
-    # 统计所有像素
-    for y in range(height):
-        for x in range(width):
-            val = img.getpixel((x, y))
-            if val == 0:
-                zeros += 1
-            else:
-                non_zeros += 1
-                if val not in values:
-                    values[val] = 0
-                values[val] += 1
-                
-    print(f"Total pixels: {width*height}")
-    print(f"Zeros (Black?): {zeros}")
-    print(f"Non-zeros (White?): {non_zeros}")
-    print(f"Non-zero values distribution: {values}")
-
-if __name__ == "__main__":
-    # 尝试找一个存在的图片，或者创建一个
-    img_path = "test_image.png"
-    if not os.path.exists(img_path):
-        # 创建一个简单的测试图片
-        img = Image.new('RGB', (100, 100), color = 'white')
-        # 画个黑框
-        from PIL import ImageDraw
-        d = ImageDraw.Draw(img)
-        d.rectangle([10, 10, 90, 90], outline='black', fill='black')
-        img.save("debug_test.png")
-        img_path = "debug_test.png"
-        print("Created debug_test.png")
-        
-    debug_image(img_path)
diff --git a/websocket_server/convert_img.py b/websocket_server/convert_img.py
index 470d7cb..71c6694 100644
--- a/websocket_server/convert_img.py
+++ b/websocket_server/convert_img.py
@@ -57,10 +57,9 @@ def image_to_tspl_commands(image_path):
             # 逻辑修正:
             # 我们希望 黑色像素(0) -> 打印(1)
             # 白色像素(255) -> 不打印(0)
-            # 使用 < 128 判定，增加容错性，防止像素值偏移
             
             should_print = False
-            if pixel < 128: # Black or Dark Gray
+            if pixel == 0: # Black
                 should_print = True
             
             if should_print:
diff --git a/websocket_server/server.py b/websocket_server/server.py
index 2b6333c..4e26954 100644
--- a/websocket_server/server.py
+++ b/websocket_server/server.py
@@ -427,39 +427,6 @@ async def handle_font_request(websocket, message_type, data):
         except Exception as e:
             print(f"Error handling font request: {e}")
 
-class LockedWebSocket:
-    """
-    WebSocket wrapper with a lock to prevent concurrent write operations.
-    The websockets library (legacy protocol) does not support concurrent writes,
-    which can lead to 'AssertionError: assert waiter is None' when multiple tasks
-    try to send data simultaneously.
-    """
-    def __init__(self, websocket: WebSocket):
-        self.websocket = websocket
-        self.lock = asyncio.Lock()
-        
-    async def accept(self):
-        await self.websocket.accept()
-        
-    async def receive(self):
-        return await self.websocket.receive()
-        
-    async def send_text(self, data: str):
-        async with self.lock:
-            await self.websocket.send_text(data)
-            
-    async def send_bytes(self, data: bytes):
-        async with self.lock:
-            await self.websocket.send_bytes(data)
-            
-    async def send_json(self, data):
-        async with self.lock:
-            await self.websocket.send_json(data)
-            
-    async def close(self, code=1000):
-        async with self.lock:
-            await self.websocket.close(code)
-
 class MyRecognitionCallback(RecognitionCallback):
     def __init__(self, websocket: WebSocket, loop: asyncio.AbstractEventLoop):
         self.websocket = websocket
@@ -569,8 +536,8 @@ def optimize_prompt(asr_text, progress_callback=None):
 1. 风格必须是：简单的黑白线稿、简笔画、图标风格 (Line art, Sketch, Icon style)。
 2. 画面必须清晰、线条粗壮，适合低分辨率热敏打印机打印。
 3. 绝对不要有复杂的阴影、渐变、黑白线条描述。
-4. 背景必须是纯白 (White background)，线条要粗方便打印。
-5. 提示词内容请使用英文描述，因为绘图模型对英文理解更好，但在描述中强调 "black and white line art", "bold simple lines", "vector style"。
+4. 背景必须是纯白 (White background)。
+5. 提示词内容请使用英文描述，因为绘图模型对英文理解更好，但在描述中强调 "black and white line art", "simple lines", "vector style"。
 6. 尺寸比例遵循宽48mm:高30mm (约 1.6:1)。
 7. 直接输出优化后的提示词，不要包含任何解释。"""
 
@@ -709,17 +676,8 @@ def generate_image(prompt, progress_callback=None, retry_count=0, max_retries=2)
                 from PIL import Image
                 img = Image.open(GENERATED_IMAGE_FILE)
                 
-                # 缩小到THUMB_SIZE x THUMB_SIZE，保持比例并居中（防止拉伸）
-                img.thumbnail((THUMB_SIZE, THUMB_SIZE), Image.LANCZOS)
-                
-                # 创建黑色背景 (240x240)
-                bg = Image.new("RGB", (THUMB_SIZE, THUMB_SIZE), (0, 0, 0))
-                
-                # 计算居中位置
-                left = (THUMB_SIZE - img.width) // 2
-                top = (THUMB_SIZE - img.height) // 2
-                bg.paste(img, (left, top))
-                img = bg
+                # 缩小到THUMB_SIZE x THUMB_SIZE
+                img = img.resize((THUMB_SIZE, THUMB_SIZE), Image.LANCZOS)
                 
                 # 转换为RGB565格式的原始数据
                 # 每个像素2字节 (R5 G6 B5)
@@ -791,8 +749,6 @@ def generate_image(prompt, progress_callback=None, retry_count=0, max_retries=2)
 
 @app.websocket("/ws/audio")
 async def websocket_endpoint(websocket: WebSocket):
-    # 使用 LockedWebSocket 包装原始 websocket 以防止并发写入冲突
-    websocket = LockedWebSocket(websocket)
     global audio_buffer
     await websocket.accept()
     print("Client connected")
@@ -1025,5 +981,4 @@ if __name__ == "__main__":
     local_ip = socket.gethostbyname(hostname)
     print(f"Server running on ws://{local_ip}:8000/ws/audio")
     
-    # 禁用自动Ping以避免并发写入冲突 (ws_ping_interval=None)
-    uvicorn.run(app, host="0.0.0.0", port=8000, ws_ping_interval=None, ws_ping_timeout=None)
+    uvicorn.run(app, host="0.0.0.0", port=8000)