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# 1.11 DSU Compute CRC32

This example application demonstrates how to use the DSU Peripheral library to compute 32-bit Cyclic Redundancy Checksum (CRC).

## Description

The DSU unit provides support for calculating a 32-bit CRC value for a memory area. This example application computes the 32-bit hardware CRC value using the DSU Peripheral and validates it using a software-calculated CRC value.

## Downloading and Building the Application

To clone or download this application from Github, go to the main page of this repository and then click Clone button to clone this repository or download as zip file. This content can also be downloaded using content manager by following these instructions.

Path of the application within the repository is apps/dsu/dsu_crc32_generate/firmware.

To build the application, refer to the following table and open the project using its IDE.

Project Name | Description
--- | ---
sam_l21_xpro.X | MPLABX project for SAM L21 Xplained Pro Evaluation Kit

## Setting Up the Hardware

The following table shows the target hardware for the application projects.

Project Name | Description
--- | ---
sam_l21_xpro.X | SAM L21 Xplained Pro Evaluation Kit

### Setting Up SAM L21 Xplained Pro Evaluation Kit

- Connect the Debug USB port on the board to the computer using a micro USB cable

## Running the Application

1. Build and Program the application using its IDE
2. The LED indicates the success or failure:
   - LED is turned ON when the hardware CRC value matched with the software calculated CRC value
   - LED is turned OFF when the hardware CRC value did not match with the software calculated CRC value

The following table provides the LED name:

Board | LED Name
--- | ---
SAM L21 Xplained Pro Evaluation Kit | LED0