How can I do the same job that the simulink block "Byte Unpack" but in matlab not with simulink

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Alexis Artuso 2016-6-22

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评论： Alexis Artuso 2016-6-27

Hi everyone,

I'm looking for functions in matlab or different ways to create a function which can do the same job that the simulink block "Byte Unpack".

I'm trying to unpack the input data message(uint8) to the unpacked output message (single) with 6 output ports dimension (See picture). But in my case I don't want to use simulink, only matlab code. The input data message come from to :

    Receiver = dsp.UDPReceiver('LocalIPPort',8080,'RemoteIPAddress','192.168.102.111',...
                                'ReceiveBufferSize',24,'MaximumMessageLength',24,'MessageDataType','uint8');
    DATAReceived = step(Receiver);

Any ideas? or suggestions?

Thanks,

Alexis

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Answer 1

Steven Lord 2016-6-22

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I think some combination of typecast and swapbytes will get you close to what you want.

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Steven Lord 2016-6-22

在 MATLAB Online 中打开

You want to know how to get 6 single precision numbers from typecast? Pass in a vector of 24 int8 values.

s = single(1:6)
in = typecast(s, 'int8')
s2 = typecast(in, 'single')

Take a look at the values in s and in with the display format set to "format hex" and you should see how they're related. You can also experiment with swapbytes on s and how that affects the values stored in in.

Alexis Artuso 2016-6-27