Errors when using HDL coder

Question

Xiaotong on 24 Nov 2025 at 6:32

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https://www.mathworks.com/matlabcentral/answers/2181435-errors-when-using-hdl-coder

Commented: Xiaotong on 26 Nov 2025 at 1:28

Hallo, when i was using hdl coder for my project, and I keep getting this issue:

Exception in thread "AWT-EventQueue-0": java.lang.NullPointerException

at com.mathworks.toolbox.coder.model.MetadataTree.getFunctionNode(MetadataTree.java:59)

at com.mathworks.toolbox.coder.model.MetadataTree.getNode(MetadataTree.java:44)

at com.mathworks.toolbox.coder.model.MetadataTree.put(MetadataTree.java:27)

at com.mathworks.toolbox.coder.mi.ConversionUtils.convertRangesAndTypes(ConversionUtils.java:562)

at com.mathworks.toolbox.coder.mi.ConversionUtils.convertRangesAndTypes(ConversionUtils.java:500)

at com.mathworks.toolbox.coder.fixedpoint.FixedPointController.handleSimulationResults(FixedPointController.java:690)

at com.mathworks.toolbox.coder.fixedpoint.FixedPointController.access$1100(FixedPointController.java:71)

at com.mathworks.toolbox.coder.fixedpoint.FixedPointController$11.handleResult(FixedPointController.java:506)

at com.mathworks.toolbox.coder.mi.FevalCommand$1.run(FevalCommand.java:119)

at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)

at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)

at java.awt.EventQueue.access$500(EventQueue.java:97)

at java.awt.EventQueue$3.run(EventQueue.java:709)

at java.awt.EventQueue$3.run(EventQueue.java:703)

at java.security.AccessController.doPrivileged(Native Method)

at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)

at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)

at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)

at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

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Xiaotong on 25 Nov 2025 at 1:22

Edited: Xiaotong on 25 Nov 2025 at 1:24

Hi, I tried this code in hdlcoder in both Matlab and simulink, and the issue appeared:

function [out,out_valid ] = Interleave3 (in, in_valid, in_start, in_final, iBIL)

persistent T v v_valid i j k in_buffer E STARTED READY1 READY2 out_buffer

if isempty(v)

T = uint16(0);

v = false(1,2025); %% 45*45

v_valid = false(1,2025);

i = uint16(0);

j = uint16(0);

k = uint16(0);

E = uint16(0);

STARTED = false;

in_buffer = false(1,1024);

READY1 = false;

READY2 = false;

out_buffer = false(1,1024);

end

T = uint16(ceil((cordicsqrt(1 + bitsll(E,3))-1) / 2 ));

out = false;

out_valid = false;

if in_start

T = uint16(0);

v = false(1,2025); %% 45*45

v_valid = false(1,2025);

i = uint16(0);

j = uint16(0);

k = uint16(0);

E = uint16(0);

STARTED = true;

in_buffer = false(1,1024);

READY1 = false;

READY2 = false;

out_buffer = false(1,1024);

end

if in_valid && STARTED

E = E+1;

in_buffer(E) = in;

end

if in_final && STARTED

READY1 = true;

STARTED = false;

end

if READY1

if i<=T

%coder.unroll();

%for q = 1:16

if j<T-i

if k<E

v(i+45*j+1) = in_buffer(k+1);

v_valid(i+45*j+1) = true;

end

k = k+1;

j = j+1;

end

if j<T-i

if k<E

v(i+45*j+1) = in_buffer(k+1);

v_valid(i+45*j+1) = true;

end

k = k+1;

j = j+1;

end

if j<T-i

if k<E

v(i+45*j+1) = in_buffer(k+1);

v_valid(i+45*j+1) = true;

end

k = k+1;

j = j+1;

end

if j<T-i

if k<E

v(i+45*j+1) = in_buffer(k+1);

v_valid(i+45*j+1) = true;

end

k = k+1;

j = j+1;

end

%end

if j == T-i

j = uint16(0);

i = i+1;

end

else

READY1 = false;

READY2 = true;

k = uint16(0);

i = uint16(0);

j = uint16(0);

end

if READY2

if j<=T

%coder.unroll();

%for q = 1:16

if i<T-j

out_buffer(k+1)= v(i+45*j+1) && v_valid(i+45*j+1) ;

k = k+1*uint16(v_valid(i+45*j+1));

i = i+1;

end

if i<T-j

out_buffer(k+1)= v(i+45*j+1) && v_valid(i+45*j+1) ;

k = k+1*uint16(v_valid(i+45*j+1));

i = i+1;

end

if i<T-j

out_buffer(k+1)= v(i+45*j+1) && v_valid(i+45*j+1) ;

k = k+1*uint16(v_valid(i+45*j+1));

i = i+1;

end

if i<T-j

out_buffer(k+1)= v(i+45*j+1) && v_valid(i+45*j+1) ;

k = k+1*uint16(v_valid(i+45*j+1));

i = i+1;

end

%end

if j == T

k = uint16(0);

end

if j == T-i

i = uint16(0);

j = j+1;

end

else

out_valid = true;

k = k+1;

out = out_buffer(k);

if k == E

READY2 = false;

end

Abhijeet on 25 Nov 2025 at 11:54

Hello @Xiaotong,

Thanks for sharing your script. It appears the issue takes place within the "Fixed Point Conversion" step when you supply it with your test bench script. If you have supplied your own "Simulation Ranges" and "Proposed Types" please share that with us as well along with your test bench script. This will help us reproduce the issue and work on a fix.

Thanks.

Xiaotong on 26 Nov 2025 at 1:28

Hi @Abhijeet,

thanks for you response. Here is my testbench; And I didn't manually specify the ranges, the ranges are analyzed from the tb.

function tb_Interleave3 ()

in = [1 1 0 1 1 0 0 0 0 1 0 0 1 1 1 0 0 0 1 1 0 1 0 0 0 1 1 1 1 0 1 1 0 0 0 0 1 0 0 1 1 1 0 0 0 1 1 0 1 0 0 0 1 1 ];

iBIL = true;

e = logical([in, zeros(1,500)]);

e_valid = logical([ones(1,54),zeros(1,500)]);

e_start = logical([1,zeros(1,500)]);

e_final = logical([zeros(1,53),1,zeros(1,500)]);

iBIL = true;

for i=1:500

[ult(i),ult_valid(i)] = Interleave3 (e(i),e_valid(i), e_start(i), e_final(i), iBIL);

end

Thanks!

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Answer 1

Kiran Kintali on 24 Nov 2025 at 13:26

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https://www.mathworks.com/matlabcentral/answers/2181435-errors-when-using-hdl-coder#answer_1572228

Can you reach out to technical support with the reproduction steps?

Contact Support - MATLAB & Simulink

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Errors when using HDL coder

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