修改协议文档

   ```mermaid

   packet-beta

   title 执行帧

   0-1: "0xBABE"

   2: "Code"

   3: "Num"

   0-1: "0xCAFE"

   2-3: "ID"

   4-7: "Arg1"

   8-11: "Arg2"

   12-15: "Arg3"

   16-17: "Request ID"

   18-19: "CRC-16"

   20-21: "0xDEAD"

   ```

#### 2. 接收帧

   ```mermaid

   packet-beta

   title 返回帧

   0-1: "0x1A64"

   2-3: "Request ID"

   4: "Type"

   5-8: "Value"

   9: "CRC-8"

   10-11: "End 0xDEAD"

   ```

   ```

   enum Type {

	   0x86: "INT32",

	   0x32: "FP32"

   }

   2-3: "Func ID"

   4-7: "Return Value"

   8-9: "Value"

   ```

### 二、数据

#### 1. 接收帧