diff --git a/ReadMe.txt b/ReadMe.txt
index a251b73..e55d6d4 100644
--- a/ReadMe.txt
+++ b/ReadMe.txt
@@ -131,5 +131,7 @@
 2024.1.15
     实现方案导入导出，根据选项自动生成文件名
     添加任务时添加对应的错误码
+2024.3.20
+    添加自定义传输协议编解码
 
 
diff --git a/coder_2ch/prottcp.py b/coder_2ch/prottcp.py
index c8f49e3..a3a1bcf 100644
--- a/coder_2ch/prottcp.py
+++ b/coder_2ch/prottcp.py
@@ -500,7 +500,7 @@ if __name__ == "__main__":
     # data=bytearray([2,1,2,3,0,   3,5,6,7,0,   9,8,9,10,0])
 
     u.cmd=0x50
-    data=bytearray([7])
+    data=bytearray([6])
 
     print(u.encode(data).hex(' '))
     # with open("file/EX_Coder_Test_2023-07-6.json","rb") as f:
@@ -538,7 +538,7 @@ if __name__ == "__main__":
 # 总线设置20V
 # 59 6d 06 00 50 00 00 05 c8 00 8b b0
 # 关总线
-# 59 6D 43 05 00 50 00 00 00 06 0E 0E 
+# 59 6d 04 00 50 00 00 06 90 9d
 # 检总线电流
 # 59 6d 04 00 50 00 00 07 51 5d
 
diff --git a/mysql/mysql.py b/mysql/mysql.py
index eab10cf..59056e7 100644
--- a/mysql/mysql.py
+++ b/mysql/mysql.py
@@ -118,6 +118,15 @@ class sql:
             print(i)
         return a
 
+    # 下载文件数据
+    def download_data(self,table_name:str,id:int):
+        cmd="select name,data from {d1} WHERE id={d2};".format(d1=table_name,d2=id)
+        self.cur.execute(cmd)
+        a=self.cur.fetchall()[0]
+        name=a[0].replace('\\','/').split('/')[-1].split('.')
+        name='.'.join(name[:-1])+'--'+str(id)+'.'+name[-1]
+        return (name,a[1])
+
     # 下载指定文件,返回文件路径
     def download(self,id:int):
         if not os.path.exists(self.download_path):
diff --git a/mysql/prot_cmd.py b/mysql/prot_cmd.py
new file mode 100644
index 0000000..67542cd
--- /dev/null
+++ b/mysql/prot_cmd.py
@@ -0,0 +1,82 @@
+import json
+
+import mysql as sql
+import prot_codec as pr
+
+
+
+SQL=sql.sql()
+SQL.init("test_data")
+
+
+_DATA=None
+
+# 获取文件夹目录，参数：无
+def get_dirs_list():
+  r=SQL.show_tables()
+  j=[]
+  for item in r:
+    j.append(item[0])
+  js=json.dumps(j)
+  return js
+
+
+# 获取文件列表，参数：json{文件的目录}
+def get_files_list(j:bytearray):
+  SQL.table_name=json.loads(j)["dir"]
+  r=SQL.show()
+  js=json.dumps(r)
+  print(js)
+  return js
+
+# 获取文件，参数：json{文件目录，文件序号}
+def get_file_data(j:bytearray):
+  js=json.loads(j)
+  name,data=SQL.download_data(js["dir"],js["id"])
+  print(name,len(data))
+  global _DATA
+  _DATA=data
+  js=json.dumps({'name':name,"size":len(data)})
+  return js
+
+# 获取指定长度的数据,参数：json{偏移，长度}
+def get_data(j:bytearray):
+  js=json.loads(j)
+  off=js["off"]
+  length=js["len"]
+  if(off<len(_DATA)):
+    data=_DATA[off:]
+    if(length<len(data)):
+      return data[:length]
+    else:
+      return data
+  return bytearray()
+
+_cmd_list={
+  "get_dirs":get_dirs_list,
+  "get_files":get_files_list,
+  "get_file":get_file_data,
+  "get_data":get_data,
+}
+
+
+if __name__ == '__main__':
+  
+  # dirs_str=get_dirs()
+  # data=pr.encode(b"dirs",dirs_str.encode("utf-8"))
+  # print(data.hex(' '))
+  # print(pr.decode(data))
+  # files=_cmd_list["get_files"](b"checker_host_app")
+  # print(json.loads(files))
+  # print(list(_cmd_list.keys()))
+  data=_cmd_list["get_file"](json.dumps({"dir":"checker_host_app","id":42}))
+  print(data)
+  ret=bytearray()
+  off=0
+  while off<len(_DATA):
+    ret+=_cmd_list["get_data"](json.dumps({"off":off,"len":200}))
+    off+=200
+  if(ret==_DATA):
+    print("check success")
+  else:
+    print("check failed")
diff --git a/mysql/prot_codec.py b/mysql/prot_codec.py
new file mode 100644
index 0000000..812a70d
--- /dev/null
+++ b/mysql/prot_codec.py
@@ -0,0 +1,103 @@
+
+import os
+import sys
+
+
+
+
+# 计算整个数据流的CRC
+def _crc16(data:bytearray):
+  lenth=len(data)
+  if(lenth>0):
+    crc=0xffff
+    for i in range(lenth):
+      crc=(crc^data[i])&0xffff
+      for j in range(8):
+        if(crc&1)!=0:
+          crc=((crc>>1)^0xa001)&0xffff
+        else:
+          crc=(crc>>1)&0xffff
+    return bytearray([crc&0xff,(crc>>8)&0xff])
+  return bytearray([0,0])
+
+
+# 0xff帧起始，0xfe帧结尾
+# 0xf0转义标识
+# 0xf1命令数据分割
+# 0xf2数据校验分割
+
+# 字节数据大于等于0xf0 之后要转义
+def _tran(data:bytearray):
+  ret=bytearray()
+  for item in data:
+    if(item>=0xf0):
+      ret.append(0xf0)
+      ret.append(item-0xf0)
+    else:
+      ret.append(item)
+  return ret
+
+# 去转义
+def _untran(data:bytearray):
+  ret=bytearray()
+  i=0
+  length=len(data)
+  while i<length:
+    if(data[i]>=0xf0):
+      ret.append(data[i]+data[i+1])
+      i+=1
+    else:
+      ret.append(data[i])
+    i+=1
+  return ret
+
+
+# 以命令和数据编码
+def encode(cmd:bytearray,data:bytearray):
+  crc=_crc16(cmd+data)
+  ret=bytearray()
+  ret.append(0xff)
+  ret+=_tran(cmd)
+  ret.append(0xf1)
+  ret+=_tran(data)
+  ret.append(0xf2)
+  ret+=_tran(crc)
+  ret.append(0xfe)
+  return ret
+
+
+# 解码为命令和数据
+def decode(data:bytearray):
+  while len(data)>0:
+    if(data[0]!=0xff):
+      data=data[1:]
+    else:
+      break
+  if(len(data)==0):
+    return (None,None)
+  if(data[0]==0xff and data[-1]==0xfe):
+    data=data[1:-1]
+    cmd_index=data.find(0xf1)
+    data_index=data.find(0xf2)
+    cmd=_untran(data[:cmd_index])
+    da=_untran(data[cmd_index+1:data_index])
+    crc=_untran(data[data_index+1:])
+    if(crc==_crc16(cmd+da)):
+      return (cmd,da)
+  return (None,None)
+
+
+
+
+
+
+
+
+if __name__ == "__main__":
+  data=encode(b"cmd_test",bytearray([0xff,0xfd,0xff,0xde,0xde]))
+  print(data.hex(' '))
+  print(decode(data))
+
+
+
+