1.9 CRC-32 Generation
This example application demonstrates how to use the CRC peripheral to compute 32-bit Cyclic Redundancy Checksum (CRC).
Description
The CRC unit provides support for calculating a CRC-8, CRC-16 and CRC-32 value on a user buffer or Flash memory without CPU intervention.
This example application computes the 32-bit CRC value for the poynomial (0x04C11DB7) using the CRC peripheral.
Once the hardware CRC is generated, it is validated 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/crc/crc32_generate/firmware
To build the application, refer to the following table and open the project using its IDE.
| Project Name | Description |
|---|---|
| pic32mm_curiosity.X | MPLABX project for PIC32MM Curiosity Development Board |
Setting up the hardware
The following table shows the target hardware for the application projects.
| Project Name | Board |
|---|---|
| pic32mm_curiosity.X | MPLABX project for PIC32MM Curiosity Development Board |
Setting up PIC32MM Curiosity Development Board
To run the demo, the following additional hardware are required:
Connect micro USB cable to the 'USB1' connector on the board to the computer
Install an USB UART click board on to the mikroBUS socket J4
Connect mini USB cable between PC and the USB UART click board
Note: Ensure that the series resistors on the mikroBUS headers are of value 0 Ohms
Running the Application
Open the Terminal application (Ex.:Tera term) on the computer
Connect to the "USB to UART" COM port and configure the serial settings as follows:
Baud : 115200
Data : 8 Bits
Parity : None
Stop : 1 Bit
Flow Control : None
Build and Program the application project using its IDE
Following message is output on console:
Expected CRC Value for the polynomial (0x04C11DB7) is (0xcbf43926)
The LED indicates the success or failure:
LED1 is turned ON when the hardware CRC value matches with the software calculated CRC value
Following table provides LED names:
| Board | LED name |
|---|---|
| PIC32MM Curiosity Development Board | LED1 |