fixpt和浮点转换之间的HDL代码生成失败

Question

我被困在使用MATLAB的hdlcode生成hdl代码的过程中。

function a00 = pre_test(srcX,srcY)

   for y = 1:255
       for x = 1:255
            a00 = (1/y) *x + srcX + srcY ;
       end
   end
end

运行以下代码时，出现以下错误消息。

HDL Code Generation Check Report for 'pre_test_fixpt'


Generated on 2018-08-09 21:12:56

HDL Conformance check complete with 2 errors, 0 warnings, and 0 messages.

Function Location   Level   Description
pre_test_fixpt:0    Error   A cast between fixpt and floating point type is not supported, at Function 'eml_fi_checkforntype' (#15.947.965), line 26, column 25 Function 'fi_impl' (#9.10494.10558), line 274, column 15 Function 'fi_impl' (#9.2380.2450), line 79, column 15 Function 'pre_test_fixpt' (#1.684.711), line 15, column 22.
pre_test_fixpt:0    Error   MATLAB HDL Coder failed in the code generation phase. See HDL Coder conformance report.

和pre_test_fixpt.m是下面的

function a00 = pre_test_fixpt(srcX,srcY)

   fm = get_fimath();

   for y = 1:255
       for x = 1:255
            a00 = fi(fi((1/y) *x, 0, 30, 22, fm) + srcX + srcY, 0, 30, 21, fm) ;
       end
   end




end


function fm = get_fimath()
    fm = fimath('RoundingMethod', 'Floor',...
         'OverflowAction', 'Wrap',...
         'ProductMode','FullPrecision',...
         'MaxProductWordLength', 128,...
         'SumMode','FullPrecision',...
         'MaxSumWordLength', 128);
end

我应该怎么做才能解决此问题？