Error: A cast between fixpt and floating point type is not supported

1 次查看（过去 30 天）
Sandip Paul
Sandip Paul 2019-12-21
回答： Kiran Kintali 2019-12-26
I am trying to convert my matlab code to HDL verilog code by HDL Coder. Fixed-Point Conversion shows no Error,but at the time HDL code Generation it show error that
" ErrorA cast between fixpt and floating point type is not supported, at Function 'cameraman_dwt_code1_fixpt' (#1.874.875), line 21, column 12."
My Fixed-Point Arithmatic code is-
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% Generated by MATLAB 9.2 and Fixed-Point Designer 5.4 %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%#codegen
function xavg12 = cameraman_dwt_code1_fixpt(xr1)
fm = get_fimath();
[fmo_1,fmo_2,fmo_3,fmo_4] = dwt2(xr1,'db3');
xavg = fi(fmo_1, 0, 14, 5, fm);
xhr = fi(fmo_2, 1, 14, 43, fm);
xvr = fi(fmo_3, 1, 14, 43, fm);
xdig = fi(fmo_4, 0, 14, 83, fm);
x1=fi(xavg(1,1), 0, 14, 5, fm); %#This line creates error at xavg(1,1) section(above mentiond on error- line21,coloumn 12)
xavg12=fi(x1, 0, 14, 5, fm);
end
function fm = get_fimath()
fm = fimath('RoundingMethod', 'Floor',...
'OverflowAction', 'Wrap',...
'ProductMode','FullPrecision',...
'MaxProductWordLength', 128,...
'SumMode','FullPrecision',...
'MaxSumWordLength', 128);
end
####################### My function is->
function xavg12 = cameraman_dwt_code1(xr1)
[xavg,xhr,xvr,xdig] = dwt2(xr1,'db3');
x1=xavg(1,1);
xavg12=x1;
####################### My TestBench code is->
x=158;
xavg11=cameraman_dwt_code1(x);
disp(xavg11);
############# It is actually for an Image processing code but I want to test it only for a single pixel value.
Overall code output is 1.2392 for pixel or input value 158 which is acurate but still I can not solved the Fixed-Point Arithmatic code.
Please Help me.Thank you
  4 个评论
显示 2更早的评论
Walter Roberson
Walter Roberson 2019-12-21
I have not used the Fixed Point toolbox, only read a little about it.
At the moment I am concerned that possibly dwt2() is not being transformed to fixed point.
I wonder if it would help to switch to an integer wavelet? https://www.mathworks.com/help/wavelet/ug/lifting-method-for-constructing-wavelets.html#bs9j3kj

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Kiran Kintali
Kiran Kintali 2019-12-23
编辑：Kiran Kintali 2019-12-23
Hi Sandip,
The issue here is not related to fixed-point conversion; HDL Coder currently does not support dwt2 function out of the box for HDL code generation.
You need to rewrite dwt2_hdl(pixel_in) function to accomplish the algorithm on hardware.
Thanks

更多回答（2 个）

Kiran Kintali
Kiran Kintali 2019-12-26
Hi Sandip,
Since dwt2 is not supported out of the box, please consider using core MATLAB to HDL features and implement dwt2_fpga.m using first principles. There is lot of material on the web related to this topic. https://tinyurl.com/s8flm5j
The previously mentioned links show you how to write good MATLAB suitable for HDL code generation.
Thanks
Sandip Paul
Sandip Paul 2019-12-23
编辑：Sandip Paul 2019-12-23
Hi Kiran, very much thank you for your suggestion. Is there any other way to make a HDL representation of dwt2 from matlab code?

类别

在 Help Center 和 File Exchange 中查找有关 HDL Code Generation 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by