Mixed Kernels (RTL & C)

This example has one RTL kernel and one C kernel. Both RTL kernel and C kernel perform vector addition. The C kernel reads the output from RTL kernel as one of two inputs.

KEY CONCEPTS: Mixed Kernels

This example demonstrates how we can have RTL as well as C kernels in a single application. Both RTL kernel, rtl_vadd and C kernel, cl_vadd perform the vector addition. C kernel reads the result of addition by the RTL kernel as one of its inputs and adds another vector.

RTL kernels can be integrated to Vitis using RTL Kernel Wizard. These kernels have the same software interface model as OpenCL and C/C++ kernels. That is, they are seen by the host application as functions with a void return value, scalar arguments, and pointer arguments.

The RTL Kernel Wizard automates some of the steps that need to be taken to ensure that the RTL IP is packaged into a kernel that can be integrated into a system in Vitis environment.

EXCLUDED PLATFORMS

Platforms containing following strings in their names are not supported for this example :

nodma

DESIGN FILES

Application code is located in the src directory. Accelerator binary files will be compiled to the xclbin directory. The xclbin directory is required by the Makefile and its contents will be filled during compilation. A listing of all the files in this example is shown below

src/hdl/krnl_vadd_rtl.v
src/hdl/krnl_vadd_rtl_adder.sv
src/hdl/krnl_vadd_rtl_axi_read_master.sv
src/hdl/krnl_vadd_rtl_axi_write_master.sv
src/hdl/krnl_vadd_rtl_control_s_axi.v
src/hdl/krnl_vadd_rtl_counter.sv
src/hdl/krnl_vadd_rtl_int.sv
src/host.cpp
src/krnl_vadd.cpp

Access these files in the github repo by clicking here.

COMMAND LINE ARGUMENTS

Once the environment has been configured, the application can be executed by

./rtl_vadd_mixed_c_vadd <vadd XCLBIN>