Reading Data From A Serial Port In C
Data events can be caused by any of the items in the enumeration. Because the operating system determines whether to raise this event or not, not all parity errors may be reported. The DataReceived event is also raised if an Eof character is received, regardless of the number of bytes in the internal input buffer and the value of the property., DataReceived, and events may be called out of order, and there may be a slight delay between when the underlying stream reports the error and when the event handler is executed. Only one event handler can execute at a time. The DataReceived event is not guaranteed to be raised for every byte received.
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Use the property to determine how much data is left to be read in the buffer. The DataReceived event is raised on a secondary thread when data is received from the object. Because this event is raised on a secondary thread, and not the main thread, attempting to modify some elements in the main thread, such as UI elements, could raise a threading exception. If it is necessary to modify elements in the main or, post change requests back using, which will do the work on the proper thread. For more information about handling events, see.
1) I'd add a /n after init. Write( USB, 'init n', 5); 2) Double check the serial port configuration. Odds are something is incorrect in there. Just because you don't use ^Q/^S or hardware flow control doesn't mean the other side isn't expecting it. 3) Most likely: Add a 'usleep(100000); after the write.
Reading serial port in C#. Rate this: Please Sign up or sign in to vote. Serial port reading data. Reading from serial port using C in visual studio. Immediately after you read, there may be more bytes in the driver: for example if the serial port is flow-controlled, reading from the driver allows the device to send again / send more. Whether you can clear the buffer 'before the next data arrive' is difficult to say: I don't know when the next data is supposed to arrive. Dec 17, 2013 c# reading data from Serial port. I'm checking for ANY data received over the com port. To test if the data that I'm receiving includes GPS data.
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The file-descriptor is set not to block or wait, right? How long does it take to get a response back before you can call read? (It has to be received and buffered by the kernel, through system hardware interrupts, before you can read it.) Have you considered using select to wait for something to read?
Perhaps with a timeout? Edited to Add: Do you need the DTR/RTS lines? Hardware flow control that tells the other side to send the computer data? Int tmp, serialLines; cout.