Step 1: Build the AI Engine Design in Model Composer

In the MATLAB Current Folder, navigate to AIEngine_Tutorial/Lab1/.

Use the subsequent steps to import the kernel function fir_27t_sym_hb_2i into the design. This is an interpolating-by-two filter fir symmetric filter. Because it is interpolating, the output of the filter is twice the size of the input. Open the source code hb_27_2i.cpp from kernels/src/hb_27_2i.cpp, and notice this kernel has a window in and a window out.

void fir_27t_sym_hb_2i
(
	input_window_cint16 * cb_input,
	output_window_cint16 * cb_output)
{

Double-click import_kernel.slx to open the model. This is a model with only sources and sinks. You will fill the design in-between.

From the Library Browser, select the AIE Kernel block from under the User-Defined functions of the AI Engine library. Drag the block into the import_kernel.slx file.

Double-click the block. The following block parameters GUI displays.

update the block parameters as follows:

Kernel header file: Either browse to locate the hb_27_2i.h file or enter kernels/inc/hb_27_2i.h as the parameter.
Kernel function: fir_27t_sym_hb_2i
Kernel init function: Leave empty
Kernel source file: either browse to locate hb_27_2i.cpp file or enter kernels/src/hb_27_2i.cpp as the parameter.
Kernel search path: Leave empty
Preprocessor options: Leave empty

Click Import. The tool parses the function signature in the header file and updates the AIE kernel block GUI interface. A new GUI panel (Function) gets created as shown in the following figure.

Update the parameter values as indicated in the following figure.

Important: All parameters are in samples (not bytes).

Important: The tool does not parse the kernel function and it does not have any knowledge about the input or output window sizes, nor the input window margin size.

After applying, Click OK to close the window and connect the block to the input as shown in the following figure.

Next import the polar_clip function. Unlike the previous kernel, the polar clip has a stream in port and a stream out port. The function signature is as follows.

Drag the new AIE Kernel block from AI Engine library and update the parameters as follows:

Kernel header file: kernels/inc/polar_clip.h
Kernel function: polar_clip
Kernel init function: Leave empty
Kernel source file: kernels/src/polar_clip.cpp
Kernel search paths: Leave empty
Preprocessor options: Leave empty

Click Import. The tool parses the header file and creates the block. Update the parameter value as shown in the followinf figure.

Important: Here, the Window size and Window Margin fields are not applicable for signals of type stream.

Important: The Signal size parameter is the maximum size of the output - variable size signal.

Connect this block to the existing design and it should now look as follows.

You have connected a block with a window output to a block with a stream input.

Use the subsequent steps to import the final kernel function fir_27t_symm_hb_dec2 into the design. This is a decimation by two filter and the signature to this function is as follows.

void fir_27taps_symm_hb_dec2
(
	input_window_cint16 * inputw,
	output_window_cint16 * outputw
){

Drag the new AIE Kernel block from the AI Engine library and update the parameters as follows:

Kernel header file: kernels/inc/hb_27_2d.h
Kernel function: fir_27taps_symm_hb_dec2
Kernel init function: Leave empty
Kernel source file: kernels/src/hb_27_2d.cpp
Kernel search paths: Leave empty
Preprocessor options: Leave empty

After applying, click OK to close the window. A new Function panel opens. Set the parameters for this kernel as follows.

Connect the block to the existing design. It should look as follows.

Step 1: Build the AI Engine Design in Model Composer - 2020.2 English

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