Why do I get an error with system object calls in HDL Code Generation?
显示 更早的评论
error: hdlcoder:pirudd:systemobjectmultipleuse: System object methods can only be called once
My Code:
main fucntion:
[x,validOut] = mainfc(data_in,st)
persistent var ifft128 out1
if isempty(var)
var=0;
ifft128 = dsp.HDLIFFT('FFTLength',128);
end
if st==1
[out1] = func1(data);
%IFFT calculation
[Xt,validOut]=ifft128_fc(ifft128,out1,true)
elseif st==0
%To complete the IFFT calculation
[Xt,validOut]=ifft128_fc(ifft128,out1,false)
end
%ifft128_fc
function [yOut,validOut] = ifft128_fc(objeto,yIn,validIn)
[yOut,validOut] = step(objeto,yIn,validIn);
end
%My test bench for the main function
N = 128;
for i=1:1:N
[X,V] = main_fc(data_in,1);
end
for i = N+1:1:3*N
[X,V] = main_fv(data_in,0)
end
采纳的回答
Tim McBrayer
2016-7-18
I'm not an expert in the DSP side of the product, but my understanding of your code is that you are invoking the same object twice in a single time step. You have a single dsp.HDLIFFT named ifft128 in your design. Each time that your function mainfc is called will correspond (in the simple case) to a single hardware clock cycle. In this single cycle you are calling the step function on ifft128 twice. This function can be thought of as the behavior of the IFFT implementation. So, in essence, you are attempting to run the same FFT twice in one cycle. This is not supported for HDL code generation for fairly straightforward reasons, although MATLAB has no issues executing the code that you have written. HDL Coder does not perform enough semantic analysis to notice that the two calls to step() are mutually exclusive from each other.
Your code looks easy to update. You need to make one call to your wrapper function:
[Xt,validOut]=ifft128_fc(ifft128,out1, st == 0);
If st can be any value besides 0 or 1, you may want to enclose this call inside the appropriate if statement:
if st == 0 || st == 1
[Xt,validOut]=ifft128_fc(ifft128,out1, st == 0);
end
更多回答（1 个）
Walter Roberson
2016-7-16
You have
if isempty(var)
but you never assign to var so isempty will continue to be true, resulting in the next line being executed every pass.
2 个评论
Pablo Medina
2016-7-16
编辑：Pablo Medina
2016-7-16
Walter Roberson
2016-7-17
Please post the actual code. For example should the first bit you posted a function definition where the "function" keyword has wandered off to the washroom, or is that code part of a script file? I don't think HDL can compile script files as the main entry.
类别
在 帮助中心 和 File Exchange 中查找有关 HDL Code Generation 的更多信息
产品
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
