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pravalika reddy
NA
15
17.8k
serialport reading error (I/O operation exception )
Mar 2 2015 6:43 AM
when i run this program, it can display the data and refresh it smoothly, and after a while, the whole form hanged.(read the data
from serial port
every 1 millisecond )
please help me any idea
here my code
private void SetComport()
{
if (GlobVar.nTxRxFlag == 1) // if port configuration is successfull then //
{
GlobVar.TheMCU.serialPort1.DiscardInBuffer();
GlobVar.TheMCU.serialPort1.DiscardOutBuffer();
GlobVar.TheMCU.serialPort1.Close(); // port is closed //
GlobVar.nTxRxFlag = 0; // set the default flag value //
GlobVar.nComflag = 0;
}
GlobVar.TheMCU.serialPort1.PortName = comboBox_ComPort.SelectedItem.ToString();
GlobVar.TheMCU.serialPort1.BaudRate = Convert.ToInt32(comboBox_Buadrate.SelectedItem.ToString()); // Converted the selected combobox value into the Integer Value //
GlobVar.TheMCU.serialPort1.Parity = Parity.None;
GlobVar.TheMCU.serialPort1.DataBits = Convert.ToInt16(comboBox_DataBits.SelectedItem.ToString()); // Converted the selected combobox value into the Integer Value //
GlobVar.TheMCU.serialPort1.Handshake = (Handshake)Enum.Parse(typeof(Handshake), comboBox_FlowControl.Text);
GlobVar.TheMCU.serialPort1.StopBits = StopBits.One; // if select the stopbits is one //
GlobVar.TheMCU.serialPort1.ReadBufferSize=6400000;
/*** if port is available then port is open otherwise port is can't open then error is occured ***/
try
{
if (GlobVar.TheMCU.serialPort1.IsOpen == false)
{
GlobVar.TheMCU.serialPort1.Open(); // try to open the selected port //
MessageBox.Show("Port configuration Is Successful"); // port configuration is successful //
GlobVar.nTxRxFlag = 1;
GlobVar.nComflag = 1;
//
}
}
catch // give a message, if the port is not available //
{
MessageBox.Show("Serial port " + GlobVar.TheMCU.serialPort1.PortName +
" cannot be opened!, port is not available OR Port is used another process", " ", MessageBoxButtons.OK, MessageBoxIcon.Warning); // port error //
}
private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
GlobVar.nLeng = GlobVar.TheMCU.serialPort1.BytesToRead;
if ((GlobVar.nLeng > 0) && (GlobVar.nLeng < 30000))
{
for (int s = 0; s < GlobVar.nLeng; s++)
{
nLength = GlobVar.TheMCU.serialPort1.Read(bLocalBuf, 0, 1);
if (nLength == 1)
{
if (bLocalBuf[0] == 0xc9 && GlobVar.nSOMFlag == 0)
{
GlobVar.nRindex = 0;
GlobVar.RxBufferData[GlobVar.nRindex++] = bLocalBuf[0];
GlobVar.nSOMFlag = 1;
}
else if (bLocalBuf[0] == 0xcf && GlobVar.nSOMFlag == 1)
{
Rx_Checksum(); // To compare the recv data Checksum //
GlobVar.RxBufferData[GlobVar.nRindex++] = bLocalBuf[0];
if ((GlobVar.RxBufferData[2] == 0x01)) Rx_LinkCheck();
}
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