Calling coder.ceval with external variable as one of the arguments

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David Friesen 2018-4-13

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/394707-calling-coder-ceval-with-external-variable-as-one-of-the-arguments

I have a model with a MATLAB system block used for generating custom c-code. In my external C-code, I have a global variable called "buffer", which is an array of 8 bytes. In the step function I want to be able to copy a portion of the data from "buffer" to the output of the function (see below). Is there a way to declare the fact that "buffer" is an external variable?

   function y = stepImpl(obj)
       y = uint32(0)
       if( coder.target('Rtw') )
         coder.ceval('memcpy', coder.ref(y), coder.ref(buffer(2)), uint8(4))
       end
   end