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# 1.14 NVMCTRL Read Write

This example application demonstrates how to use the NVMCTRL to erase and program the internal Flash memory.

## Description

This example uses the NVMCTRL peripheral library to erase a row and write an array of values to the internal Flash memory. It verifies the value written by reading the values back and comparing it to the value written.

## 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/nvmctrl/nvmctrl_flash_read_write/firmware.

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

Project Name | Description
--- | ---
sam_d21_xpro.X | MPLABX project for SAM D21 Xplained Pro Evaluation Kit
sam_da1_xpro.X | MPLABX project for SAM DA1 Xplained Pro Evaluation Kit

## Setting Up the Hardware

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

Project Name | Description
--- | ---
sam_d21_xpro.X | SAM D21 Xplained Pro Evaluation Kit
sam_da1_xpro.X | SAM DA1 Xplained Pro Evaluation Kit

### Setting Up SAM D21 Xplained Pro Evaluation Kit

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

### Setting Up SAM DA1 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:
   - The LED is turned ON when the value read from the flash memory matched with the written value
   - The LED is turned OFF when the value read from the flash memory did not match with the written value
3. The following table provides the LED name:

   Board | LED Name
   --- | ---
   SAM D21 Xplained Pro Evaluation Kit | LED0
   SAM DA1 Xplained Pro Evaluation Kit | LED0