Delphi Xe5 Serial Communication Port
Quote So I thought to put the comport inside a dedicated thread, so it could answer faster.Fine. In in an app that is not busy, I would not expect events, (which arefired in the main thread using 'synchronize'), to be delayed by more than1ms. Since your TcomPort fails to reply fast enough on only a fewoccasions, I agreee that the best step is probably to use TcomPort inthreaded mode.If you look at the code for TComPort, you will see that, in common with mostserial port components, it already uses a read thread internally. I suggestthat you try to use this thread directly to implement your serial comms.Plonk your TComPort component onto the form as you have been doing, and setthe SyncMethod to smNone. The read event will now not be synchronized atall & will be simply called directly by the read thread. In the OnRxCharevent, you can analyse your protocol in your usual way & send the correctreply to your device.
Serial com port monitor, good component for Delphi 2009? Edit I have been looking for a good component that compiles with Delphi 2009 and supports serial com port analyzing ('sniffing'). To give an example, the hhd Serial Port Monitor Control is the functionality we are looking for, but it doesn't work well with Delphi (many errors).
If some/any of the protocol exchanges require VCLinteraction, then you will need to take into account that the VCL is notthread-safe. If you have to do this, look at the 'postMessage' API.
If youhave any perfomance problem, it's way best to stay well away from'synchronize' or any other main-thread comms design that involves the readthread waiting for the main thread to do something.You may also want to raise the priority of the read thread - in theTComThread constructor, (CPort unit), set priority:=tpHigher. This willensure that serial events preempt main-thread activities. Quote But I don't know how to do it and I'm a little afraid and wary using threads because of synchronisation / critical section and other thread safe / access violations issues. Is there someone who tried to use TComport inside a Thread?If you want to, of find the need to, use TComport in a thread, I can assureyou that it works fine.
Delphi Xe5 Serial Communication Port Cable
Add a 'TComPort' field to your thread, load it witha TComport instance in the thread constructor & set its properties in code,either in the constructor or at th etop of your 'execute' method. You willalso have to set the SyncMethod to smNone and assign appropriate eventhandlers in code.I suspect that, in your case, you do not have to go to the lengths of usinga seperate thread to manage a TComPost instance that creates its own threadanyway. I may be wrong, since I do not know all the details of your app,but it's my best guess that you can get away without doing this.Rgds,Martin. Hi Martin,Sorry if the question is stupid. Quote do you know what I have to 'armour' for thread access if I use SynchMethod=smNone?No.
The problem is that I do not know what your app is doing to reply tothe serial requests from your device. There are an enormous number ofpossibilities. Some examples:FileSystem - these are thread safe because of internal protections -read/write files no problem.DB connections - opening a session with a DB from a thread is generally OK.VCL - well known to be thread-unfriendly. In most cases, I use postMessageto communicate received data in buffers/records/objects to the main threadfor display. Quote But do I have to modify something when calling other properties and methods like: ComPort.Write ComPort.Connected ComPort.ClearBuffer ComPort.ShowSetupDialog ComPort.BaudRate and so on. are these properties in the same unmanaged thread or can I use them safely from the application main thread?Maybee:)TComPort uses overlapped IO.
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There will be no problem reading from onethread and writing from another, 'simultaneously'. If you look at the codefor TComPort, or any other similar serial component, an option tosynchronize, (or use some other inter-thread comms mechanism), is available.A read thread is used because it is necessary because the waitCommEventcall, used to receive signals of serial port activity, is blocking & wouldsieze the GUI if performed from the main thread. Given this, and therequirement that rx data should be available in the main thread, someinter-thread comms is necessary between the read thread and main VCL thread.Write calls, on the other hand, do not, (normally), block - write data iscopied into the serial buffer/driver and the write call returns, probablybefore the first character has gone out on the line. So, there is noproblem with making write calls directly from the main threadSo, read calls from read thread, write calls from main thread = OK.
Thismeans.all. calls.
If the read thread needs to write as well as the mainthread, (eg. To echo rx chars back to the remote device), a criticalsection, or other protection, would be needed around the write calls.If the component is dropped on the form, and you merely wish to have theevents called by the read thread, (ie SyncMethod:=smNone), then I wouldexpect all the abovementioned calls to work without a problem mod theaforementioned requirement that write calls can only be safely made from onethread at a time.In the case of a TComPort component created an managed in a serial thread, Iwould suspect that there may be a problem with 'ShowSetupDialog'. This hasto be called from the main thread & then, when it closes, you have thesituation that 'ApplyDCB', (and hence the 'SetCommState' API), is beingcalled by the main thread on a port that is being read by the read threadand, possibly, being written by the serial thread.
Empirically, I haveseen such actions work, but I prefer not to do it myself:)In my threaded serial port stuff, the 'setup dialog', (I use a non-modalform that can be popped up by the user - streaming this form in/out persiststhe config), loads a DCB structure in an object, but does not attempt tocall SetCommState directly. I queue the DCB to the write thread, which, onreceipt of this 'new config' object, sets the comm mask to zero & waits onan event.
This causes the read thread to return from its 'waitCommEvent'call with an error, allowing it to call SetCommState with the new DCB,signal the event so that the write thread can now rseume processing writerequests and then loops around to wait on the masked comm events again, butwith the new config.Rgds.,Martin. Hi,I modified the aplication using TComport SyncMethod:=smNone and I havesome surprising results:- the application works great on my dev box (and using threads solved mytime critical responses) but using it on another computer theapplication freezes after a few minutes. I think that I have correctlyarmoured the thread part, but I'm never sure to be cautious enough whenusing threads ^^So how can I debug / trace my app outside from Delphi and my dev box asthe app will not freeze on my box?- I've noticed another curious phenomenon: checking the checkboxes'Range checking' and 'Stack Overflow' in Project Options Compiler willprevent TComport to read/write data???!!! Do you experienced the sameissue?Thank you for your help.
Delphi Xe5 Serial Communication Port Authority
ComPort LibraryThe ComPort Library contains code to access COM Ports. Originally, the COM port was the name of the serial port interface of IBM-PC compatible computers.While nowadays COM ports get less important for communication in favor for USB access, it is still in use as virtual ports, especially as simple communication protocol for maker boards.This library is a fork of the original ComPort Library 4.10, which can found here:As it is a fork, some of the original commit messages are still accessible.The master branch is focused on Delphi and all CBuilder support has been removed.