实现串口在接收到数据后如何继续发送数据

Question

工具：visual studio

输出类型:window应用程序

语言：c#

问题描述：我在使用SerialPort时，接受数据后，想要继续发送数据。

所以在发送数据的结尾加入了发送函数，但并没有接收到再次发送的数据

想请教这个问题的原因，还有实现在串口接收到数据后程序自动继续发送数据，最好怎么弄?

谢谢！

 //接收串口数据
        private void sp_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            byte[] ReceivedData = new byte[sp.BytesToRead];//创建接收字节数组
            sp.Read(ReceivedData, 0, ReceivedData.Length);//读取所接收到的数据
            receivedDatas.AddRange(ReceivedData);

            tbReceivedCount.Text = (Convert.ToInt32(tbReceivedCount.Text) + ReceivedData.Length).ToString();

            if (cb16Display.Checked)
                tbReceivedData.Text = Methods.ByteTo16Str(receivedDatas.ToArray());
            else
                tbReceivedData.Text = Encoding.Default.GetString(receivedDatas.ToArray());
            sp.DiscardInBuffer();//丢弃接收缓冲区数据
        }

        //发送串口数据
        private void DataSend()
        {
            try
            {
                if (cb16Send.Checked)
                {
                    byte[] hexBytes = Methods._16strToHex(tbSendData16);
                    sp.Write(hexBytes, 0, hexBytes.Length);
                    tbSendCount.Text = (Convert.ToInt32(tbSendCount.Text) + hexBytes.Length).ToString();
                }
                else
                {
                    sp.WriteLine(tbSendDataStr);
                    tbSendCount.Text = (Convert.ToInt32(tbSendCount.Text) + tbSendDataStr.Length).ToString();
                }

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message.ToString());
                return;
            }
        }

Answer 1

Hi,

欢迎在MSDN论坛发帖。

据我所知在串口的寄存器中，应该有一项是配置缓冲区里面是不是有数据的，有数据就会发送，或者读取。如果你想程序接收数据后自动发送数据，我觉得你加一个定时器来判断是不是已经读完数据，如果是，你就可以调用发送函数。

不用定时器你也可以用专门一个线程来检测是否有数据来了，有数据来了，就调用发送函数。

Best Regards,

Hart

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