Form1.cs

using System;
using System.IO.Ports;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace BleSerialTool
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            RefreshSerialPorts();
            cbBaudRate.SelectedItem = "230400"; // Default per requirement
        }

        private void RefreshSerialPorts()
        {
            string[] ports = SerialPort.GetPortNames();
            string lastPort = cbSerialPort.Text;
            cbSerialPort.Items.Clear();
            cbSerialPort.Items.AddRange(ports);
            
            if (ports.Length > 0)
            {
                if (!string.IsNullOrEmpty(lastPort) && Array.IndexOf(ports, lastPort) >= 0)
                {
                    cbSerialPort.Text = lastPort;
                }
                else
                {
                    cbSerialPort.SelectedIndex = 0;
                }
            }
        }

        private void btnRefreshPort_Click(object sender, EventArgs e)
        {
            RefreshSerialPorts();
        }

        private void btnOpenClose_Click(object sender, EventArgs e)
        {
            try
            {
                if (serialPort1.IsOpen)
                {
                    serialPort1.Close();
                    btnOpenClose.Text = "打开串口";
                    lblStatus.Text = "串口已关闭";
                    ToggleControls(true);
                }
                else
                {
                    if (string.IsNullOrEmpty(cbSerialPort.Text))
                    {
                        MessageBox.Show("请先选择串口！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                        return;
                    }

                    serialPort1.PortName = cbSerialPort.Text;
                    serialPort1.BaudRate = int.Parse(cbBaudRate.Text);
                    serialPort1.DataBits = 8;
                    serialPort1.StopBits = StopBits.One;
                    serialPort1.Parity = Parity.None;
                    serialPort1.DtrEnable = true; // Many USB-TTL adapters need DTR/RTS enabled
                    serialPort1.RtsEnable = true;

                    // Enable DataReceived event
                    serialPort1.DataReceived -= SerialPort1_DataReceived; // Ensure no double subscription
                    serialPort1.DataReceived += SerialPort1_DataReceived;

                    serialPort1.Open();
                    btnOpenClose.Text = "关闭串口";
                    lblStatus.Text = "串口已打开";
                    ToggleControls(false);
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show($"串口操作失败: {ex.Message}", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void ToggleControls(bool enabled)
        {
            cbSerialPort.Enabled = enabled;
            cbBaudRate.Enabled = enabled;
            btnRefreshPort.Enabled = enabled;
        }

        // Helper to check if port is open
        private bool CheckSerialPort()
        {
            if (!serialPort1.IsOpen)
            {
                MessageBox.Show("请先打开串口！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return false;
            }
            return true;
        }

        // Helper to send data (string)
        private void SendData(string data)
        {
            if (!CheckSerialPort()) return;
            try
            {
                // Write string directly as per requirement (no auto newline unless part of data)
                if (chkSendNewLine.Checked)
                {
                    data += "\r\n";
                }
                
                // Show sent data in receive box for debugging (optional but helpful)
                // txtReceive.AppendText($"[Send] {data}"); 

                serialPort1.Write(data);
                
                // Update status to show what was sent
                lblStatus.Text = $"已发送: {data.Trim()}";
            }
            catch (Exception ex)
            {
                MessageBox.Show($"发送失败: {ex.Message}", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        // Async One-Key Configuration
        private async void btnOneKeyConfig_Click(object sender, EventArgs e)
        {
            if (!CheckSerialPort()) return;

            btnOneKeyConfig.Enabled = false;
            lblStatus.Text = "正在配置...";

            try
            {
                // 1. AT+RENEW
                AppendSystemMessage("发送: AT+RENEW");
                serialPort1.Write("AT+RENEW");
                await Task.Delay(500);

                // 2. AT+RESET
                AppendSystemMessage("发送: AT+RESET (等待重启...)");
                serialPort1.Write("AT+RESET");
                await Task.Delay(2000); // Wait 2s for reboot

                // 3. AT+SERVFFE0
                AppendSystemMessage("发送: AT+SERVFFE0");
                serialPort1.Write("AT+SERVFFE0");
                await Task.Delay(500);

                // 4. AT+CHRXFFE1
                AppendSystemMessage("发送: AT+CHRXFFE1");
                serialPort1.Write("AT+CHRXFFE1");
                await Task.Delay(500);

                // 5. AT+CHTXFFE1
                AppendSystemMessage("发送: AT+CHTXFFE1");
                serialPort1.Write("AT+CHTXFFE1");
                await Task.Delay(500);

                lblStatus.Text = "配置完成";
                MessageBox.Show("一键配置完成！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            catch (Exception ex)
            {
                MessageBox.Show($"配置过程中出错: {ex.Message}", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
                lblStatus.Text = "配置出错";
            }
            finally
            {
                btnOneKeyConfig.Enabled = true;
            }
        }

        private void btnScan_Click(object sender, EventArgs e)
        {
            if (!CheckSerialPort()) return;
            lblStatus.Text = "正在扫描...";
            SendData("AT+SCAN?");
        }

        private void btnConnect_Click(object sender, EventArgs e)
        {
            if (!CheckSerialPort()) return;
            string mac = txtTargetMac.Text.Trim();
            if (string.IsNullOrEmpty(mac))
            {
                MessageBox.Show("请输入目标MAC地址！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }

            lblStatus.Text = "正在连接...";
            // Command format: AT+CON + MAC (e.g., AT+CON442C05E63936)
            SendData("AT+CON" + mac);
        }

        private void btnDisconnect_Click(object sender, EventArgs e)
        {
            if (!CheckSerialPort()) return;
            lblStatus.Text = "断开连接...";
            SendData("AT+DISCON");
        }

        private void btnSend_Click(object sender, EventArgs e)
        {
            if (!CheckSerialPort()) return;
            string data = txtSend.Text;
            if (string.IsNullOrEmpty(data)) return;
            
            SendData(data);
            // Requirement says: do not clear input box
        }

        private void btnClear_Click(object sender, EventArgs e)
        {
            txtReceive.Clear();
        }

        private void SerialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            try
            {
                // Read existing data
                string data = serialPort1.ReadExisting();
                if (string.IsNullOrEmpty(data)) return;

                // Invoke UI update
                this.Invoke(new Action(() =>
                {
                    AppendReceivedData(data);
                }));
            }
            catch (Exception)
            {
                // Handle potential closing errors
            }
        }

        private void AppendReceivedData(string text)
        {
            if (chkShowTimestamp.Checked)
            {
                // If showing timestamp, maybe we want to prepend it to new lines? 
                // Or just once per chunk? 
                // Simple approach: [Time] Data
                // But data might be fragmented.
                // For a simple terminal, just appending is fine.
                // Or we can append [HH:mm:ss.fff] before the block.
                txtReceive.AppendText($"[{DateTime.Now:HH:mm:ss.fff}] ");
            }
            
            txtReceive.AppendText(text);
            
            // Auto scroll
            txtReceive.SelectionStart = txtReceive.Text.Length;
            txtReceive.ScrollToCaret();

            // Check for specific responses to update status (Optional but good for UX)
            if (text.Contains("Connected") || text.Contains("OK+CON")) // Adjust based on actual device response
            {
                lblStatus.Text = "已连接";
            }
            else
            {
                lblStatus.Text = $"接收数据: {text.Length} 字节";
            }
        }

        private void AppendSystemMessage(string msg)
        {
            // Optional: Show system actions in receive window for debugging?
            // Or just keep it clean. Let's keep receive window for RX only as per req.
            // But user might want to see what was sent during config.
            // "右侧：多行TextBox（只读），用于显示接收到的数据" -> Only received data.
            // So I will NOT append sent data to the RX window.
        }
    }
}