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# 1.24 TRNG Random Number

This example shows how to use the TRNG Peripheral library to generate and read a random number.

## Description

This example application shows how to use the TRNG peripheral library to produce a 32-bit true random number. Generated random number can be used as an entropy source for seeding a Deterministic Random Number Generator (DRNG), creating cryptographic keys for ciphers, etc.

## 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/trng/random_number/firmware.

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

Project Name | Description
--- | ---
sam_rh71_ek.X | MPLABX project for SAM RH71 Evaluation Kit

## Setting Up the Hardware

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

Project Name | Description
--- | ---
sam_rh71_ek.X | SAM RH71 Evaluation Kit

### Setting Up SAM RH71 Evaluation Kit

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

## Running the Application

1. Open the Terminal application (Ex.:Tera term) on the computer
2. Connect to the EDBG Virtual COM port and configure the serial settings as follows:
   - Baud : 115200
   - Data : 8 Bits
   - Parity : None
   - Stop : 1 Bit
   - Flow Control : None
3. Build and program the application using its IDE
4. The console displays the following message
5. Every time the switch is pressed, a new random number is generated and displayed on the console

Following table provides the Switch name:

Board | Switch Name
--- | ---
SAM RH71 Evaluation Kit | PB0