How to pass User input COM port into serial function?

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Martin Velasquez 2019-4-16

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https://ww2.mathworks.cn/matlabcentral/answers/456770-how-to-pass-user-input-com-port-into-serial-function

关闭： Martin Velasquez 2019-4-16

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Hello

I'm trying to create a inputdlg() where it ask the user to input the comport, which will then pass it to a serial function so it may communicate with an Arduino.

My problem is that when I run the code, it does gives me an "Invalid PORT specified" error. I type the comport in the inputdlg in paranthesis, e.g 'COM5', that doesn't work. I type just COM5, still doesn't work.

Reason why I do this is because the code is to be shared with different computers so they will hae to input different comports and what not.

Thanks to anyone who read and helps

if(~exist('serialFlag','var'))
    prompt = {'Enter COM port number, if windows user use COM6 for example. If MAC user use /dev/tty. Use device manager to find Comport.'};
dlgtitle = 'COM port';
definput = {'COM5'};
answer = inputdlg(prompt,dlgtitle,[1 40],definput);
comPort = answer(1);
disp(comPort)
    [gyroConnection.s,serialFlag]=setupSerial(comPort);
end
function [s,flag] = setupSerial2(comPort)
flag=1;
s=serial(comPort);
set(s,'DataBits',8);
set(s,'StopBits',1);
set(s,'BaudRate',9600);
set(s,'Parity','none');
fopen(s);
a='b';
while (a ~='a')
    a=fread(s,1,'uchar');
end
if (a=='a')
    disp('serial read');
end
fprintf(s,'%c','a');
mbox = msgbox('Serial Communication Setup.');
uiwait(mbox);
fscanf(s,'%u');
end 