Serial port slows / freezes after a few sends.

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Reuben 2013-10-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/89981-serial-port-slows-freezes-after-a-few-sends

编辑： Reuben 2013-10-12

After sending X iterations of data over a serial port via fwrite/fprintf code begins to execute very slowly, one fwrite() call per 3 to 10 seconds. (X being nearly a random number from 3 to 1000+)

I am unsure where the problem is. The serial device is receiving the data.

clear, clc
count = 0;
delete(instrfindall) 
socket = serial('COM11','BAUD',57600);
fopen(socket);
pause(3);
for i = 1:10000
count = count + 1;
disp(count)
fwrite(socket,'A','uint8')
%fprintf(socket,'%s','A')
pause (.01)
end

EDIT

Adding "stopasync(socket)" before calling "fprintf()" results in working code. Does anyone know why without "stopasync(socket)" the code fails? I currently suspect an hardware issue as the COM port is a USB port emulating a COM port.