51单片机与下位机通信，使用C#语言
51单片机与上位机通信，使用C#语言
我用c#编写了一个小程序，想让它与单片机通信，并把单片机键盘扫描的键值通过串口传给上位机，发1时led1灯亮，发0时灯灭，但是我发出去1时灯没有反应，也接受不到键值；当我把串口的2，3脚相连是，发送数据又可以接到，这是为什么呀？那位朋友可以指点一下，这是代码
private void Form1_Load(object sender, EventArgs e)
{
int i = 0;
string[] portname = SerialPort.GetPortNames();
foreach (string port in portname)
{
CuankoucomboBox.Items.Add(port);
i++;
}
if (i > 0)
{
CuankoucomboBox.SelectedIndex = 0;
}
BotecomboBox.SelectedIndex = BotecomboBox.Items.IndexOf("9600");//波特率设为9600
Openbutton.Text = "打开串口";
sendbutton.Enabled = false;
serialPort1.Close();
}
private void Openbutton_Click(object sender, EventArgs e)
{
if (Openbutton.Text == "打开串口")
{
try
{
Openbutton.Text = "关闭串口";
sendbutton.Enabled = true;
serialPort1.PortName = CuankoucomboBox.SelectedItem.ToString();
serialPort1.BaudRate = Convert.ToInt32(BotecomboBox.SelectedItem);//设置波特率和把串口名字赋给serailport控件
serialPort1.DataBits = 8;//传输数据的长度
serialPort1.StopBits = StopBits.One;//使用停止位为1位
serialPort1.Parity = Parity.None;//不使用奇偶校验位
serialPort1.Open();//打开串口
serialPort1.DiscardInBuffer();
serialPort1.DiscardOutBuffer();//释放缓冲区的数据
}
catch(System.IO.IOException)
{
MessageBox.Show("串口不存在，请选择正确串口");
Openbutton.Text = "打开串口";
}
}
else if(Openbutton.Text=="关闭串口")
{
try
{
Openbutton.Text = "打开串口";
sendbutton.Enabled = false;
serialPort1.DiscardInBuffer();
serialPort1.DiscardOutBuffer();//释放缓冲区的数据
serialPort1.Close();
}
catch (System.InvalidOperationException)
{
Openbutton.Text = "打开串口";
serialPort1.Close();
}
}
}
Int32 receivelength;
private void sendbutton_Click(object sender, EventArgs e)
{
byte[] data = Encoding.Unicode.GetBytes(sendtextBox.Text);
serialPort1.Encoding = System.Text.Encoding.GetEncoding("GB2312");//如果发中文必须有这一句
receivelength = 0;
serialPort1.Write(sendtextBox.Text);//发送数据
serialPort1.DataReceived += new SerialDataReceivedEventHandler(serialPort1_DataReceived);//注册DataReceived事件
}
void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)//DataReceived委托事件
我用c#编写了一个小程序，想让它与单片机通信，并把单片机键盘扫描的键值通过串口传给上位机，发1时led1灯亮，发0时灯灭，但是我发出去1时灯没有反应，也接受不到键值；当我把串口的2，3脚相连是，发送数据又可以接到，这是为什么呀？那位朋友可以指点一下，这是代码
private void Form1_Load(object sender, EventArgs e)
{
int i = 0;
string[] portname = SerialPort.GetPortNames();
foreach (string port in portname)
{
CuankoucomboBox.Items.Add(port);
i++;
}
if (i > 0)
{
CuankoucomboBox.SelectedIndex = 0;
}
BotecomboBox.SelectedIndex = BotecomboBox.Items.IndexOf("9600");//波特率设为9600
Openbutton.Text = "打开串口";
sendbutton.Enabled = false;
serialPort1.Close();
}
private void Openbutton_Click(object sender, EventArgs e)
{
if (Openbutton.Text == "打开串口")
{
try
{
Openbutton.Text = "关闭串口";
sendbutton.Enabled = true;
serialPort1.PortName = CuankoucomboBox.SelectedItem.ToString();
serialPort1.BaudRate = Convert.ToInt32(BotecomboBox.SelectedItem);//设置波特率和把串口名字赋给serailport控件
serialPort1.DataBits = 8;//传输数据的长度
serialPort1.StopBits = StopBits.One;//使用停止位为1位
serialPort1.Parity = Parity.None;//不使用奇偶校验位
serialPort1.Open();//打开串口
serialPort1.DiscardInBuffer();
serialPort1.DiscardOutBuffer();//释放缓冲区的数据
}
catch(System.IO.IOException)
{
MessageBox.Show("串口不存在，请选择正确串口");
Openbutton.Text = "打开串口";
}
}
else if(Openbutton.Text=="关闭串口")
{
try
{
Openbutton.Text = "打开串口";
sendbutton.Enabled = false;
serialPort1.DiscardInBuffer();
serialPort1.DiscardOutBuffer();//释放缓冲区的数据
serialPort1.Close();
}
catch (System.InvalidOperationException)
{
Openbutton.Text = "打开串口";
serialPort1.Close();
}
}
}
Int32 receivelength;
private void sendbutton_Click(object sender, EventArgs e)
{
byte[] data = Encoding.Unicode.GetBytes(sendtextBox.Text);
serialPort1.Encoding = System.Text.Encoding.GetEncoding("GB2312");//如果发中文必须有这一句
receivelength = 0;
serialPort1.Write(sendtextBox.Text);//发送数据
serialPort1.DataReceived += new SerialDataReceivedEventHandler(serialPort1_DataReceived);//注册DataReceived事件
}
void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)//DataReceived委托事件