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Multicore Programming of a Field-Oriented Control on Zynq

This example demonstrates how to implement a control algorithm containing multiple rates on Zynq. To take advantage of both the cores and the FPGA hardware, the example uses graphical partitioning approach such that code from different partitions are distributed across the cores and the hardware.

Introduction

In this example, we show a workflow for generating code for a motor control algorithm, and testing the generated code on a Xilinx® Zynq™-7000 SoC ZC702 evaluation board. Motor control algorithm in the example is a Field-Oriented Control algorithm composed of a speed controller (fast component) and a torque controller (slow component). One typical workflow is to generate code for these two components of the controller, upload the generated code to an evaluation board and connect the evaluation board to a real-world motor. The purpose of this example is to show how to follow this workflow. This is illustrated in the block diagram below

In order for this example to be self-contained and since there is redundant computer power on the target processor, we model the motor using one of the tasks of the CPU of the evaluation board.

The example assumes that a Xilinx® Zynq™-7000 SoC ZC702 evaluation board is connected to your computer. You can find the connection and installation steps in the documentation .

This example requires Embedded Coder™ to generate multi-threaded code, HDL Coder (TM) to generate HDL code and Simscape™ to model the permanent magnet synchronous machine in the example. You cannot generate HDL code on Macintosh systems.

Example Model

The example model consists of two Simulink areas. In the Permanent Magnet Synchronous Machine area, there are two blocks: "Speed and Torque Inputs" block which provides the reference inputs to the feedback system, and "Invertor and Motor" block which is the plant we aim to control in this example. The "Invertor and Motor" block also contains peripherals: a scope that can be used for investigating the simulation results and a UDP sender. The generated code for the UDP sender is responsible for sending the simulation data from the Zynq ZC702 evaluation board to the host machine. The Field-Oriented Control contains the controller blocks "Speed controller" and "Torque controller". Load the model by typing

slexFocZynqExample

Architecture Definition

The target architecture in the example is Xilinx Zynq ZC702 evaluation kit. This can be verified by accessing the "Concurrent Execution" dialog box following the steps:

- Go to Simulation>Model Configuration Parameters,

- Click "Configure Tasks" at the Solver pane, under the Additional Options section.

The evaluation board has an ARM Cortex-A9 CPU and a field-programmable gate array (FPGA). There are two tasks running on the ARM CPU. "Torque controller" is mapped to the first task and the blocks that constitute the plant ("Speed and Torque Inputs" block and "Invertor and Motor") are mapped to the second task. "Speed controller" operating at high frequency in the control loop is mapped to the FPGA. These settings can be changed in the "Tasks and Mapping" section of the "Concurrent Execution" dialog box.

Generate Multi-threaded and HDL Code

Press Ctrl-B or click on "Deploy to Hardware" to generate the multi-threaded and HDL code. The generated executable and the FPGA bitstream will be uploaded to Zynq board automatically. In order to perform this step, Zynq board should be connected to the computer and the environment should be set properly. You can consult to the documentation for additional information.

Receive Data from the Zynq

First, open the scope by double-clicking "View Simulation Results", and run the simulation (Simulation>Run) to obtain the following output:

Compare this simulation output with the output of the executable that runs on the Zynq ZC702 board. In order to make this comparison, access the UDP receiver model by double-clicking on the "View Deployment Results". When the UDP receiver model is selected, run the simulation (Simulation>Run). The run command will send a signal to the Zynq ZC702 board to start running the executable on the board. The simulation data will be sent via UDP from the Zynq ZC702 board to the host machine. The captured UDP signal is displayed on the scope of the UDP Receiver model.

Close the Model

close_system('slexFocZynqExample', 0);
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