string parse_hdlc_bytes(byte[] hdlc_bytes)
{
const byte CTRL_U_FRAME_SNRM = 0x10; //置正常响应模式
const byte CTRL_U_FRAME_SARM_DM = 0x03; //置异步响应模式/断开方式
const byte CTRL_U_FRAME_SABM = 0x07; //置异步平衡模式
const byte CTRL_U_FRAME_SNRME = 0x1B; //置扩充正常响应模式
const byte CTRL_U_FRAME_SARME = 0x0b; //置扩充异步响应模式
const byte CTRL_U_FRAME_SABME = 0x0f; //置扩充异步平衡模式
const byte CTRL_U_FRAME_DISC_RD = 0x08; //断链/请求断链
const byte CTRL_U_FRAME_SIM_RIM = 0x01; //置初始化方式/请求初始化方式
const byte CTRL_U_FRAME_UP = 0x04; //无编号探询
const byte CTRL_U_FRAME_UI = 0x00; //无编号信息
const byte CTRL_U_FRAME_XID = 0x17; //交换识别
const byte CTRL_U_FRAME_RESET = 0x13; //复位
const byte CTRL_U_FRAME_FRMR = 0x11; //帧拒绝
const byte CTRL_U_FRAME_UA = 0x0C; //无编号确认
string show_info = "地址:0x{0:X02}\r\n" +
"类型:{1}帧 CTRL:0x{2:X02} {3}";
byte[] hdlc = Assist.HdlcDecode(hdlc_bytes);
if (hdlc == null)
{
return(string.Empty);
}
byte ctrl = hdlc[1];
string frame_type;
string frame_ctrl_info;
if ((ctrl & 0x01) == 0)
{
int ns = (ctrl & 0x0e) >> 1;
int nr = (ctrl & 0xe0) >> 5;
frame_type = "I";
frame_ctrl_info = string.Format("N(S)={0},N(R)={1}", ns, nr);
}
else if ((ctrl & 0x03) == 1)
{
byte s = (byte)((ctrl & 0x0C) >> 2);
frame_type = "S";
string type;
switch (s)
{
case 0:
type = "RR";
break;
case 1:
type = "RNR";
break;
case 2:
type = "REJ";
break;
case 3:
default:
type = "SREJ";
break;
}
frame_ctrl_info = string.Format("S={0}({1}),N(R)={2}", s, type, (ctrl & 0xe0) >> 5);
}
else
{
frame_type = "U";
byte cmd = (byte)((((ctrl) & 0xE0) >> 3) | (((ctrl) & 0x0c) >> 2));
frame_ctrl_info = string.Format("CMD=0x{0:X02} ", cmd);
switch (cmd)
{
case CTRL_U_FRAME_SNRM:
frame_ctrl_info += "SNRM";
break;
case CTRL_U_FRAME_SARM_DM:
frame_ctrl_info += "SARM_DM";
break;
case CTRL_U_FRAME_SABM:
frame_ctrl_info += "SABM";
break;
case CTRL_U_FRAME_SNRME:
frame_ctrl_info += "SNRME";
break;
case CTRL_U_FRAME_SARME:
frame_ctrl_info += "SARME";
break;
case CTRL_U_FRAME_SABME:
frame_ctrl_info += "SAME";
break;
case CTRL_U_FRAME_DISC_RD:
frame_ctrl_info += "DISC_RD";
break;
case CTRL_U_FRAME_SIM_RIM:
frame_ctrl_info += "SIM_RIM";
break;
case CTRL_U_FRAME_UP:
frame_ctrl_info += "UP";
break;
case CTRL_U_FRAME_UI:
frame_ctrl_info += "UI";
break;
case CTRL_U_FRAME_XID:
frame_ctrl_info += "XID";
break;
case CTRL_U_FRAME_RESET:
frame_ctrl_info += "RESET";
break;
case CTRL_U_FRAME_FRMR:
frame_ctrl_info += "FRMR";
break;
case CTRL_U_FRAME_UA:
frame_ctrl_info += "UA";
break;
default:
frame_ctrl_info += "未知指令";
break;
}
}
string gap;
if (checkBoxGap.Checked)
{
gap = " ";
}
else
{
gap = "";
}
return(Assist.ToHexString(hdlc, gap) + "\r\n" + String.Format(show_info, hdlc[0], frame_type, ctrl, frame_ctrl_info));
}
