[英]Changing serial port configurations programmatically in c#
I have 2
types of devices that have different protocols and are connected with a single serial port.我有
2
类型的设备,它们具有不同的协议并与单个串行端口连接。 By protocol, I mean that serial port configurations are different.通过协议,我的意思是串口配置不同。
I have a protocol id p_id
by which I can check which device is being currently read.我有一个协议 ID
p_id
通过它我可以检查当前正在读取哪个设备。 Below is my code下面是我的代码
Below is my main function which calls a class named CombinedEngine
下面是我的主函数,它调用一个名为
CombinedEngine
的类
static class Program
{
private static CombinedEngine _eng;
static async Task Main(string[] args)
{
try
{
_eng = new CombinedEngine();
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message.ToString());
//_log.Error(ex, ex.Message);
}
}
while(true);
}
Combined Engine Class组合发动机类
class CombinedEngine
{
SerialPort port = new SerialPort();
public CombinedEngine()
{
try
{
var p = mdc.mdc_protocol.ToList();
if(p.Count > 0)
{
foreach(var pr in p)
{
var p_id = pr.protocol_id;
if(p_id=="01")//modbus
{
if (port.IsOpen)
port.Close();
port = new SerialPort("COM8", 9600, Parity.Even, 8, StopBits.One);
port.ReadTimeout = 500;
port.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);
port.Open();
Console.WriteLine("Port opened successfully for modbus...");
Console.WriteLine("I am Recieving for modbus...");
var result = mdc.mdc_meter_config.Where(m => m.config_flag == 0)
.Where(m=>m.p_id == p_id).ToList();
if (result.Count > 0)
{
foreach (var item in result)
{
var iteration = new Iterations()
{
hex = (string)item.m_hex,
row_id = (string)item.row_id,
device_id = (int)item.meter_id,
protocol_id = (string)item.p_id,
command_id = (string)item.command_id,
config_flag = (int)item.config_flag,
msn = (string)item.msn,
time = (string)item.time
};
confList.Add(iteration);
time = Convert.ToDouble(item.time);
}
var modbus = confList.Where(x => x.protocol_id == "01").ToList();
aTimer = new System.Timers.Timer();
// Create a timer...
aTimer = new System.Timers.Timer();
// Hook up the Elapsed event for the timer.
aTimer.Interval = time * 1000.0;
aTimer.Elapsed += (sender, e) => MyModbusMethod(sender, e, modbus, aTimer);
aTimer.AutoReset = true;
aTimer.Enabled = true;
}
else
{
Console.WriteLine("No Data available");
}
}
else if(p_id=="02")//ytl_bus
{
if (port.IsOpen)
port.Close();
port = new SerialPort("COM8", 38400, Parity.None, 8, StopBits.One);
port.ReadTimeout = 500;
port.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);
port.Open();
Console.WriteLine("Port opened successfully for ytlbus...");
Console.WriteLine("I am Recieving for ytlbus...");
var result = mdc.mdc_meter_config.Where(m => m.config_flag == 0)
.Where(m => m.p_id == p_id).ToList();
if (result.Count > 0)
{
foreach (var item in result)
{
var iteration = new Iterations()
{
hex = (string)item.m_hex,
row_id = (string)item.row_id,
device_id = (int)item.meter_id,
protocol_id = (string)item.p_id,
command_id = (string)item.command_id,
config_flag = (int)item.config_flag,
msn = (string)item.msn,
time = (string)item.time
};
confList.Add(iteration);
time = Convert.ToDouble(item.time);
}
var ytlbus = confList.Where(x => x.protocol_id == "02").ToList();
aTimer = new System.Timers.Timer();
// Create a timer...
aTimer = new System.Timers.Timer();
// Hook up the Elapsed event for the timer.
aTimer.Interval = time * 1000.0;
aTimer.Elapsed += (sender, e) => MyElapsedMethod(sender, e,ytlbus , aTimer);
aTimer.AutoReset = true;
aTimer.Enabled = true;
}
else
{
Console.WriteLine("No Data available");
}
}
}
}
}
catch (Exception ex)
{
Console.WriteLine("Error at Line " + LineNumber(), ex.Message.ToString());
throw ex;
}
}
}
In the above code, I have checked that if p_id
is equal to 01
then modbus
serial port configurations should be done.在上面的代码中,我检查了如果
p_id
等于01
则应该完成modbus
串口配置。 But if p_id
is 02
then ytlbus
serial port configurations should be encountered.但是如果
p_id
是02
那么应该会遇到ytlbus
串口配置。 Both devices have a different baud rate and a parity bit.两种设备都有不同的波特率和奇偶校验位。 So I have tried to set them
所以我试图设置它们
Also, I have a timer which is 60
seconds.另外,我有一个
60
秒的计时器。 So after every 60
seconds, the next timer will be initialized.所以每
60
秒后,下一个计时器将被初始化。
For example.例如。 If
p_id
is 01
the code sets the baud rate to 9600
and parity to Even
.如果
p_id
是01
代码将波特率设置为9600
并将奇偶校验设置为Even
。 Then SerialDataRecievedEventHandler
is called which will check for any incoming data from the devices and it will manage the data dumping into the DB
.然后
SerialDataRecievedEventHandler
被调用,它将检查来自设备的任何传入数据,并将管理转储到DB
。
Then the code will check the device details from a table mdc_meter_config
and take out relevant information from it.然后代码将从表
mdc_meter_config
检查设备详细信息并从中取出相关信息。 All the details are added to the list one by one for all the devices.将所有详细信息一一添加到所有设备的列表中。 Also, the time would be carried out.
此外,时间将进行。 In this case, all device's time is the same ie 60 seconds.
在这种情况下,所有设备的时间都是相同的,即 60 秒。
The list is then passed to a variable which is then passed to an ElapsedEventHandler
function.然后将该列表传递给一个变量,该变量随后传递给一个
ElapsedEventHandler
函数。 The frame
sending is handled by it. frame
发送由它处理。
The same will be done for p_id
equals 02
the only difference is that it will set the baud rate to 38400
and parity to None
.对
p_id
等于02
p_id
,唯一的区别是它将波特率设置为38400
并将奇偶校验设置为None
。
What problem I am facing?我面临什么问题?
The above code runs, the issue that I am facing is that both conditions worked at the same time.上面的代码运行,我面临的问题是两个条件同时工作。 ie for
01
, it will work and then simultaneously it will jump to the 02
condition.即对于
01
,它将工作,然后同时跳转到02
条件。 Below is the image下面是图片
It should complete the work for any p_id
value, then complete the work for other p_id
value.它应该完成任何
p_id
值的工作,然后完成其他p_id
值的工作。
Update 1更新 1
I have updated my code.我已经更新了我的代码。 Added a new
async
function, added only a single timer.添加了新的
async
功能,仅添加了一个计时器。 and added a class for serial port extentions并添加了一个串行端口扩展类
public static class SerialPortExtensions
{
public async static Task ReadAsync(this SerialPort serialPort, byte[] buffer, int offset, int count)
{
var bytesToRead = count;
var temp = new byte[count];
while (bytesToRead > 0)
{
var readBytes = await serialPort.BaseStream.ReadAsync(temp, 0, bytesToRead);
Array.Copy(temp, 0, buffer, offset + count - bytesToRead, readBytes);
bytesToRead -= readBytes;
}
}
public async static Task<byte[]> ReadAsync(this SerialPort serialPort, int count)
{
var buffer = new byte[count];
await serialPort.ReadAsync(buffer, 0, count);
return buffer;
}
}
public CombinedEngine()
{
try
{
var p = mdc.mdc_protocol.ToList();
if (p.Count > 0)
{
foreach (var pr in p)
{
var p_id = pr.protocol_id;
if (p_id == "01")//modbus
{
if (port.IsOpen)
port.Close();
comm = true;
port = new SerialPort("COM8", 9600, Parity.Even, 8, StopBits.One);
port.ReadTimeout = 500;
//port.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);
port.Open();
Work();
Console.WriteLine("Port opened successfully for modbus...");
Console.WriteLine("I am Recieving for modbus...");
}
else if (p_id == "02")//ytl_bus
{
if (port.IsOpen)
port.Close();
comm = true;
port = new SerialPort("COM8", 38400, Parity.None, 8, StopBits.One);
port.ReadTimeout = 500;
//port.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);
port.Open();
Work();
Console.WriteLine("Port opened successfully for ytlbus...");
Console.WriteLine("I am Recieving for ytlbus...");
}
var result = mdc.mdc_meter_config.Where(m => m.config_flag == 0).ToList();
if (result.Count > 0)
{
foreach (var item in result)
{
var iteration = new Iterations()
{
hex = (string)item.m_hex,
row_id = (string)item.row_id,
device_id = (int)item.meter_id,
protocol_id = (string)item.p_id,
command_id = (string)item.command_id,
config_flag = (int)item.config_flag,
msn = (string)item.msn,
time = (string)item.time
};
confList.Add(iteration);
time = Convert.ToDouble(item.time);
}
var modbus = confList.Where(x => x.protocol_id == "01").ToList();
var ytlbus = confList.Where(x => x.protocol_id == "02").ToList();
//ModbusMethod(modbus);
aTimer = new System.Timers.Timer();
// Create a timer...
aTimer = new System.Timers.Timer();
// Hook up the Elapsed event for the timer.
aTimer.Interval = time * 1000.0;
aTimer.Elapsed += (sender, e) => MyElapsedMethod(sender, e, ytlbus, modbus, aTimer);
//aTimer.Elapsed += OnTimedEvent(iterations, dataItems);
aTimer.AutoReset = true;
aTimer.Enabled = true;
}
else
{
//Console.WriteLine("No Data available");
}
}
}
}
catch (Exception ex)
{
Console.WriteLine("Error at Line " + LineNumber(), ex.Message.ToString());
throw ex;
}
finally
{
}
}
public async void Work()
{
try
{
var data = await port.ReadAsync(4096);
Console.WriteLine("Data at Line " + LineNumber(), data.ToString());
//DoStuff(data);
}
catch (Exception ex)
{
Console.WriteLine("Error at Line " + LineNumber(), ex.Message.ToString());
}
}
The error now I am getting is The I/O operation has been aborted because of either a thread exit or an application request.
现在我得到的错误是
The I/O operation has been aborted because of either a thread exit or an application request.
at System.IO.Ports.InternalResources.WinIOError(Int32 errorCode, String str) at System.IO.Ports.SerialStream.EndRead(IAsyncResult asyncResult) at System.IO.Stream.<>c.b__43_1(Stream stream, IAsyncResult asyncResult) at System.Threading.Tasks.TaskFactory
1.FromAsyncTrimPromise
1.Complete(TInstance thisRef, Func3 endMethod, IAsyncResult asyncResult, Boolean requiresSynchronization) at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter
1.GetResult() at CommunicationProfile.SerialPortExtensions.d__0.MoveNext() in F:\\MDC Development\\Scheduler\\CommunicationProfile\\CombinedEngine.cs:line 1198 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter.GetResult() at C在 System.IO.Ports.InternalResources.WinIOError(Int32 errorCode, String str) 在 System.IO.Ports.SerialStream.EndRead(IAsyncResult asyncResult) 在 System.IO.Stream.<>c.b__43_1(Stream stream, IAsyncResult asyncResult)在 System.Threading.Tasks.TaskFactory
1.FromAsyncTrimPromise
(TInstance thisRef, Func3 endMethod, IAsyncResult asyncResult, Boolean requiresSynchronization) at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter
1.GetResult() at CommunicationProfile.SerialPortExtensions.d__0.MoveNext() in F:\\MDC Development\\Scheduler\\CommunicationProfile\\CombinedEngine.cs:line 1198 at System.Runtime .CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter.GetResult() at C ommunicationProfile.SerialPortExtensions.d__1.MoveNext() in F:\\MDC Development\\Scheduler\\CommunicationProfile\\CombinedEngine.cs:line 1207 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult() at CommunicationProfile.CombinedEngine.d__27.MoveNext() in F:\\MDC Development\\Scheduler\\CommunicationProfile\\CombinedEngine.cs:line 368ommunicationProfile.SerialPortExtensions.d__1.MoveNext() 在 F:\\MDC Development\\Scheduler\\CommunicationProfile\\CombinedEngine.cs:line 1207 在 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 在 System.Runtime.CompilerServices.TaskAwaiterAndDebuggerNotHandleN (任务任务)在 System.Runtime.CompilerServices.TaskAwaiter`1.GetResult() at CommunicationProfile.CombinedEngine.d__27.MoveNext() in F:\\MDC Development\\Scheduler\\CommunicationProfile\\CombinedEngine.cs:line 368
The error is occurring at below lines错误发生在以下几行
var readBytes = await serialPort.BaseStream.ReadAsync(temp, 0, bytesToRead);//1198 line
await serialPort.ReadAsync(buffer, 0, count);//1207 line
var data = await port.ReadAsync(4096); // 368 line
Note: The above method should be running continuously as the devices are powered on and will send their data after every 60
seconds.注意:上述方法应在设备通电时连续运行,并在每
60
秒后发送数据。
Any help would be highly appreciated.任何帮助将不胜感激。
The main problem with the last revision of your code is that you are calling Work()
without await
, so the call just creates an asynchronous background task and doesn't wait for its completion.上次修订代码的主要问题是您调用
Work()
没有使用await
,因此该调用只会创建一个异步后台任务,而不会等待其完成。 Also, this functionality should not exist inside the constructor, but in a separate async
method.此外,此功能不应存在于构造函数中,而应存在于单独的
async
方法中。
Second suggestion is to remove the if
/ switch
statements from the loop, and place the data needed to differentiate these protocols in a separate class.第二个建议是从循环中删除
if
/ switch
语句,并将区分这些协议所需的数据放在一个单独的类中。 You could place any additional properties needed for each protocol inside this class:您可以在此类中放置每个协议所需的任何其他属性:
// contains specific settings for each ProtocolId
class ProtocolCfg
{
public string ProtocolId { get; set; }
public string PortName { get; set; }
public int BaudRate { get; set; }
public Parity Parity { get; set; }
public int DataBits { get; set; }
public StopBits StopBits { get; set; }
public ProtocolCfg(string id, string port, int baud, Parity parity, int bits, StopBits stop)
{
ProtocolId = id; PortName = port; BaudRate = baud; Parity = parity;
DataBits = bits; StopBits = stop;
}
}
With this in place, your for
loop doesn't need to differentiate between these protocols:有了这个,你的
for
循环就不需要区分这些协议了:
class CombinedEngine
{
readonly ProtocolCfg[] _portConfigs;
public CombinedEngine(ProtocolCfg[] portConfigs)
{
// just assign the field and do nothing else
_portConfigs = portConfigs;
}
public async Task Run(CancellationToken cancelToken)
{
// repeat indefinitely
while (!cancelToken.IsCancellationRequested)
{
// run all protocols
foreach (var portcfg in _portConfigs)
{
SerialPort serialPort = null;
try
{
// init using current config
serialPort = new SerialPort(
portcfg.PortName, portcfg.BaudRate, portcfg.Parity,
portcfg.DataBits, portcfg.StopBits);
serialPort.ReadTimeout = 500;
// await data
var data = await serialPort.ReadAsync(4096);
// do something with this data
Console.WriteLine($"P{portcfg.ProtocolId}: {data.Length}B received");
// do other stuff here
// wait between protocol changes if needed?
await Task.Delay(500, cancelToken);
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}
finally
{
serialPort?.Close();
serialPort?.Dispose();
}
}
// wait between iterations?
await Task.Delay(500, cancelToken);
}
}
}
When calling the Run
function, remember that it's async, so you need to call await
.调用
Run
函数时,请记住它是异步的,因此您需要调用await
。 However, you also may want to wait for a keypress inside the console, so in that case you would store the returned Task
in a variable, and cancel it when needed:但是,您可能还需要等待控制台内的按键操作,因此在这种情况下,您可以将返回的
Task
存储在一个变量中,并在需要时取消它:
class Program
{
static void Main(string[] args)
{
// define all possible protocols
var protocols = new[]
{
new ProtocolCfg("01", "COM8", 9600, Parity.Even, 8, StopBits.One),
new ProtocolCfg("02", "COM8", 38400, Parity.None, 8, StopBits.One)
};
// we will need this to tell the async task to end
var tokenSource = new CancellationTokenSource();
var token = tokenSource.Token;
// note that this constructor does not do anything of importance
var engine = new CombinedEngine(protocols);
// this is where all the work is done, pass the cancellation token
var task = engine.Run(token);
// wait until Q is pressed
Console.WriteLine("Running, press Q to quit... ");
ConsoleKey k;
do { k = Console.ReadKey().Key; }
while (k != ConsoleKey.Q);
// shutdown
tokenSource.Cancel();
task.Wait();
Console.WriteLine("Done.");
}
}
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