The way I have done it in QtTinySA ( which I just finished testing in Windows and am about to "release") is to put the 'stop scanning' command from the GUI into a FIFO queue and then detect the presence of it in the measurement thread, because that's thread-safe.? The thread then sends the 'abort' command and empties the buffer.? It takes it about 2 seconds to stop, even with the lowest RBW slow scan.
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I detect the "end of scan" character to ensure that the interpretation of the reading's frequency is not "out of sync" with the actual hardware.? But I may have misunderstood the "end of scan" character - I did a little inspection of the returned data and decided it was '}{', have I got that wrong Erik?
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QtTinySA v0.11.7 with firmware 1.4.177 is noticeably faster scanning when the scan speed is higher, because of the reduced overhead from not having to send the scan command for every sweep.
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Ian
