C#串口通信：发送数据接收指令无法触发数据接收事件（serialPort1_DataReceived）

已被格式化的叔叔 2017-09-05 02:39:18

[size=16px]在上位机调试的时候发现连续发送两次串口数据接收指令，数据接收处理事件只响应一次，请问这个是什么原因？[/size]
数据接收触发事件：
private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
if (TargetType_Monitor == true)
{
Thread.Sleep(100);
}
else
{
Thread.Sleep(20);
}

try
{
int DataLength = serialPort1.BytesToRead;
byte[] data = new byte[DataLength];
int len = serialPort1.Read(data, 0, DataLength);
byte Checksum = 0;
if ((len == DataLength) && (data[0] == 0xAC) && (data[1] == 0x0C))
{
Checksum = (byte)(0xFF - (0xFF & (data[0] + data[1] + data[2] + data[3] + data[4] + data[5] + data[6] + data[7] + data[8] + data[9] + data[10] + data[11] + data[12] + data[13] + data[14] )));
if (Checksum == data[len-1])
{
uUartReceiveFlag = true;
TVReturnStatus = 0;
if ((InitValueType == InitValue.DefaultValue) && (SaveDefaultData == false))
{

uColorTemp_Table[0, 0] = data[2];
uColorTemp_Table[0, 1] = data[3];
uColorTemp_Table[0, 2] = data[4];

uColorTemp_Table[1, 0] = data[5];
uColorTemp_Table[1, 1] = data[6];
uColorTemp_Table[1, 2] = data[7];

uColorTemp_Table[2, 0] = data[8];
uColorTemp_Table[2, 1] = data[9];
uColorTemp_Table[2, 2] = data[10];

ucMeasure__Backlight = data[14];

if (!File.Exists(TEMP_DATA_FILE))
{
return;
}
using (StreamWriter sw = new StreamWriter(TEMP_DATA_FILE, false))
{
sw.WriteLine("0," + uColorTemp_Table[0, 0] + "," + uColorTemp_Table[0, 1] + "," + uColorTemp_Table[0, 2]);
sw.WriteLine("1," + uColorTemp_Table[1, 0] + "," + uColorTemp_Table[1, 1] + "," + uColorTemp_Table[1, 2]);
sw.WriteLine("2," + uColorTemp_Table[2, 0] + "," + uColorTemp_Table[2, 1] + "," + uColorTemp_Table[2, 2]);
sw.Close();
}
SaveDefaultData = true;
this.BeginInvoke(new MethodInvoker(delegate()
{
richTextBox29.Text = uColorTemp_Table[1, 0].ToString();
richTextBox26.Text = uColorTemp_Table[1, 1].ToString();
richTextBox23.Text = uColorTemp_Table[1, 2].ToString();
richTextBox39.Text = uColorTemp_Table[1, 1].ToString();
richTextBox5.Text = ucMeasure__Backlight.ToString();
}));
}
}

发送部分：
case 1:
{
startTime = DateTime.Now;
richTextBox3.Text = "调整时间: ";
timerClock.Interval = 80;
timerClock.Start();
Adjust_Repeat = 0;
if (send_normal_com((byte)RS232_CMD.AUTO_ADJUST_MODE_com, 1, 0, 0))
{
break;
}
Adjust_State = 2;
}
break;
case 2: // get data
{
if (check_cmd_return())
{
Adjust_Repeat = 0;
{

{
if (send_normal_com((byte)RS232_CMD.GET_RGB_GAIN_DATA_com, 0, 0, 0))
{
break;
}

}
}

Adjust_State = 3;
}
else
{
Adjust_Repeat++;
if (Adjust_Repeat > 15)
{
Adjust_Repeat = 0;
if (send_normal_com((byte)RS232_CMD.AUTO_ADJUST_MODE_com, 1, 0, 0))
{
break;
}
}
}
}
break;
case 3:
{
startTime = DateTime.Now;
richTextBox3.Text = "调整时间: ";
timerClock.Interval = 80;
timerClock.Start();

Adjust_Repeat = 0;

if (send_normal_com((byte)RS232_CMD.AUTO_ADJUST_MODE_com, 1, 0, 0))
{
break;
}

Adjust_State = 4;
}
break;
case 4:
{
if (check_cmd_return())
{
Adjust_Repeat = 0;

{

{
if (send_normal_com((byte)RS232_CMD.GET_RGB_GAIN_DATA_com, 0, 0, 0))
{
break;
}
}
}
Adjust_State = 0;
}
else
{
Adjust_Repeat++;
if (Adjust_Repeat > 15)
{
Adjust_Repeat = 0;
if (send_normal_com((byte)RS232_CMD.AUTO_ADJUST_MODE_com, 1, 0, 0))
{
break;
}
}
}
}
break;

说明：case3和case4重复case1和case2的动作，case2和case4连续发送两次指令想触发数据接收事件，但为什么只有case2才能触发接收事件，而case4不行？串口通讯的波特率是9600
串口数据发送部分：

private bool send_normal_com(byte com, byte value1, byte value2, byte value3)
{

byte[] P = new byte[7];
P[0] = 0xAB;
P[1] = 0x7;
P[2] = com;
P[3] = value1;
P[4] = value2;
P[5] = value3;
P[6] = (byte)(0xFF - (byte)(0xFF & (P[0] + P[1] + P[2] + P[3] + P[4] + P[5])));
try
{
if (uRS232Connect)
{
serialPort1.Write(P, 0, P[1]);
}
}
catch
{
serialPort1.Close();
richTextBox21.ForeColor = Color.Red;
richTextBox21.Text = "失败";
Adjust_State = 0;
MessageBox.Show("串口连接中断,请检查USB连线！");
return true;
}
return false;
}

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