Serial port issue on writing
up vote
0
down vote
favorite
I'm tring to talk/listen every 10 seconds to a serial port(modbus rsu 485). (UWP project)
I followed the official example proposed by Microsoft and adapted to my personal case.
The issue I'm facing is that randomly the WriteAsync() task writes the message two times consequently... for example it should write "hello" instead it writes "hellohello" generating an Unhandled Exception in 'System.Exception' in System.Private.CoreLib.dll ...
here is the rilevant code:
public async Task WriteAsync()
{
DataWriter dataWriter = new DataWriter(PortaSeriale.OutputStream);
string Funzione03 = "0x01 0x03 0x80 0x01 0x00 0x04 0x3C 0x09";
byte bytes = Funzione03.Split(' ').Select(item => Convert.ToByte(item, 16)).ToArray();
if (dataWriter != null)
{
dataWriter.WriteBytes(bytes);
await dataWriter.StoreAsync().AsTask();
dataWriter.DetachStream();
dataWriter = null;
}
}
And here is the Read function
public async Task<string> ReadAsync(uint ReadBufferLength)
{
Task<UInt32> loadAsyncTask;
byte ByteLettura = null;
dataReader.InputStreamOptions = InputStreamOptions.Partial;
loadAsyncTask = dataReader.LoadAsync(ReadBufferLength).AsTask();
UInt32 bytesRead = await loadAsyncTask; //base 32bit
if (bytesRead > 0) //se leggi byte, convertili in Hexadecimal
{
ByteLettura = dataReader.ReadBuffer(bytesRead).ToArray();
string HexMessage = string.Join("-", ByteLettura.Select(item => item.ToString("X2")));
return HexMessage;}
return $"";
}
The timer is set in MainPage and ticks every 10 seconds. If it is necessary I'll post its code.
I don't know how to deal with this issue... any suggestion ?
thx!
uwp serial-port modbus
asked Nov 20 at 14:59
Lemon Pies
406
add a comment |
up vote
0
down vote
favorite
I'm tring to talk/listen every 10 seconds to a serial port(modbus rsu 485). (UWP project)
I followed the official example proposed by Microsoft and adapted to my personal case.
The issue I'm facing is that randomly the WriteAsync() task writes the message two times consequently... for example it should write "hello" instead it writes "hellohello" generating an Unhandled Exception in 'System.Exception' in System.Private.CoreLib.dll ...
here is the rilevant code:
public async Task WriteAsync()
{
DataWriter dataWriter = new DataWriter(PortaSeriale.OutputStream);
string Funzione03 = "0x01 0x03 0x80 0x01 0x00 0x04 0x3C 0x09";
byte bytes = Funzione03.Split(' ').Select(item => Convert.ToByte(item, 16)).ToArray();
if (dataWriter != null)
{
dataWriter.WriteBytes(bytes);
await dataWriter.StoreAsync().AsTask();
dataWriter.DetachStream();
dataWriter = null;
}
}
And here is the Read function
public async Task<string> ReadAsync(uint ReadBufferLength)
{
Task<UInt32> loadAsyncTask;
byte ByteLettura = null;
dataReader.InputStreamOptions = InputStreamOptions.Partial;
loadAsyncTask = dataReader.LoadAsync(ReadBufferLength).AsTask();
UInt32 bytesRead = await loadAsyncTask; //base 32bit
if (bytesRead > 0) //se leggi byte, convertili in Hexadecimal
{
ByteLettura = dataReader.ReadBuffer(bytesRead).ToArray();
string HexMessage = string.Join("-", ByteLettura.Select(item => item.ToString("X2")));
return HexMessage;}
return $"";
}
The timer is set in MainPage and ticks every 10 seconds. If it is necessary I'll post its code.
I don't know how to deal with this issue... any suggestion ?
thx!
uwp serial-port modbus
asked Nov 20 at 14:59
Lemon Pies
406
How do you specify ReadBufferLength?
– kennyzx
Nov 20 at 15:09
On main page, the function is called as Ricevuto = await modBus.ReadAsync(1024); maybe 1024 is the problem?
– Lemon Pies
Nov 20 at 15:11
Could you share your code sample?
– Nico Zhu - MSFT
Nov 21 at 9:15
@NicoZhu-MSFT Here I have upload a gists
– Lemon Pies
Nov 21 at 15:58
nothing found? :(
– Lemon Pies
Nov 23 at 10:32
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I'm tring to talk/listen every 10 seconds to a serial port(modbus rsu 485). (UWP project)
I followed the official example proposed by Microsoft and adapted to my personal case.
The issue I'm facing is that randomly the WriteAsync() task writes the message two times consequently... for example it should write "hello" instead it writes "hellohello" generating an Unhandled Exception in 'System.Exception' in System.Private.CoreLib.dll ...
here is the rilevant code:
public async Task WriteAsync()
{
DataWriter dataWriter = new DataWriter(PortaSeriale.OutputStream);
string Funzione03 = "0x01 0x03 0x80 0x01 0x00 0x04 0x3C 0x09";
byte bytes = Funzione03.Split(' ').Select(item => Convert.ToByte(item, 16)).ToArray();
if (dataWriter != null)
{
dataWriter.WriteBytes(bytes);
await dataWriter.StoreAsync().AsTask();
dataWriter.DetachStream();
dataWriter = null;
}
}
And here is the Read function
public async Task<string> ReadAsync(uint ReadBufferLength)
{
Task<UInt32> loadAsyncTask;
byte ByteLettura = null;
dataReader.InputStreamOptions = InputStreamOptions.Partial;
loadAsyncTask = dataReader.LoadAsync(ReadBufferLength).AsTask();
UInt32 bytesRead = await loadAsyncTask; //base 32bit
if (bytesRead > 0) //se leggi byte, convertili in Hexadecimal
{
ByteLettura = dataReader.ReadBuffer(bytesRead).ToArray();
string HexMessage = string.Join("-", ByteLettura.Select(item => item.ToString("X2")));
return HexMessage;}
return $"";
}
The timer is set in MainPage and ticks every 10 seconds. If it is necessary I'll post its code.
I don't know how to deal with this issue... any suggestion ?
thx!
uwp serial-port modbus
asked Nov 20 at 14:59
Lemon Pies
406
I'm tring to talk/listen every 10 seconds to a serial port(modbus rsu 485). (UWP project)
I followed the official example proposed by Microsoft and adapted to my personal case.
The issue I'm facing is that randomly the WriteAsync() task writes the message two times consequently... for example it should write "hello" instead it writes "hellohello" generating an Unhandled Exception in 'System.Exception' in System.Private.CoreLib.dll ...
here is the rilevant code:
public async Task WriteAsync()
{
DataWriter dataWriter = new DataWriter(PortaSeriale.OutputStream);
string Funzione03 = "0x01 0x03 0x80 0x01 0x00 0x04 0x3C 0x09";
byte bytes = Funzione03.Split(' ').Select(item => Convert.ToByte(item, 16)).ToArray();
if (dataWriter != null)
{
dataWriter.WriteBytes(bytes);
await dataWriter.StoreAsync().AsTask();
dataWriter.DetachStream();
dataWriter = null;
}
}
And here is the Read function
public async Task<string> ReadAsync(uint ReadBufferLength)
{
Task<UInt32> loadAsyncTask;
byte ByteLettura = null;
dataReader.InputStreamOptions = InputStreamOptions.Partial;
loadAsyncTask = dataReader.LoadAsync(ReadBufferLength).AsTask();
UInt32 bytesRead = await loadAsyncTask; //base 32bit
if (bytesRead > 0) //se leggi byte, convertili in Hexadecimal
{
ByteLettura = dataReader.ReadBuffer(bytesRead).ToArray();
string HexMessage = string.Join("-", ByteLettura.Select(item => item.ToString("X2")));
return HexMessage;}
return $"";
}
The timer is set in MainPage and ticks every 10 seconds. If it is necessary I'll post its code.
I don't know how to deal with this issue... any suggestion ?
thx!
uwp serial-port modbus
uwp serial-port modbus
asked Nov 20 at 14:59
Lemon Pies
406
asked Nov 20 at 14:59
Lemon Pies
406
asked Nov 20 at 14:59
Lemon Pies
406
asked Nov 20 at 14:59
Lemon Pies
406
asked Nov 20 at 14:59
Lemon Pies
406
406
How do you specify ReadBufferLength?
– kennyzx
Nov 20 at 15:09
On main page, the function is called as Ricevuto = await modBus.ReadAsync(1024); maybe 1024 is the problem?
– Lemon Pies
Nov 20 at 15:11
Could you share your code sample?
– Nico Zhu - MSFT
Nov 21 at 9:15
@NicoZhu-MSFT Here I have upload a gists
– Lemon Pies
Nov 21 at 15:58
nothing found? :(
– Lemon Pies
Nov 23 at 10:32
add a comment |
How do you specify ReadBufferLength?
– kennyzx
Nov 20 at 15:09
On main page, the function is called as Ricevuto = await modBus.ReadAsync(1024); maybe 1024 is the problem?
– Lemon Pies
Nov 20 at 15:11
Could you share your code sample?
– Nico Zhu - MSFT
Nov 21 at 9:15
@NicoZhu-MSFT Here I have upload a gists
– Lemon Pies
Nov 21 at 15:58
nothing found? :(
– Lemon Pies
Nov 23 at 10:32
How do you specify ReadBufferLength?
– kennyzx
Nov 20 at 15:09
How do you specify ReadBufferLength?
– kennyzx
Nov 20 at 15:09
On main page, the function is called as Ricevuto = await modBus.ReadAsync(1024); maybe 1024 is the problem?
– Lemon Pies
Nov 20 at 15:11
On main page, the function is called as Ricevuto = await modBus.ReadAsync(1024); maybe 1024 is the problem?
– Lemon Pies
Nov 20 at 15:11
Could you share your code sample?
– Nico Zhu - MSFT
Nov 21 at 9:15
Could you share your code sample?
– Nico Zhu - MSFT
Nov 21 at 9:15
@NicoZhu-MSFT Here I have upload a gists
– Lemon Pies
Nov 21 at 15:58
@NicoZhu-MSFT Here I have upload a gists
– Lemon Pies
Nov 21 at 15:58
nothing found? :(
– Lemon Pies
Nov 23 at 10:32
nothing found? :(
– Lemon Pies
Nov 23 at 10:32
add a comment |
active
oldest
votes
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53395780%2fserial-port-issue-on-writing%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
active
oldest
votes
active
oldest
votes
active
oldest
votes
active
oldest
votes
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Some of your past answers have not been well-received, and you're in danger of being blocked from answering.
Please pay close attention to the following guidance:
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53395780%2fserial-port-issue-on-writing%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
How do you specify ReadBufferLength?
– kennyzx
Nov 20 at 15:09
On main page, the function is called as Ricevuto = await modBus.ReadAsync(1024); maybe 1024 is the problem?
– Lemon Pies
Nov 20 at 15:11
Could you share your code sample?
– Nico Zhu - MSFT
Nov 21 at 9:15
@NicoZhu-MSFT Here I have upload a gists
– Lemon Pies
Nov 21 at 15:58
nothing found? :(
– Lemon Pies
Nov 23 at 10:32