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# 1.26 SPI EEPROM Write Read

This example shows how to use the SPI peripheral to write and read from the SPI serial EEPROM memory.

## Description

This example uses the SPI peripheral library to write an array of values to the SPI Serial EEPROM and verify the value written by reading the values back and comparing it to the value written. The example application performs the EEPROM writing only once after a power on reset.

## 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/spi/spi_eeprom_write_read/firmware.

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

Project Name | Description
--- | ---
sam_e70_xult.X | MPLABX project for SAM E70 Xplained Ultra Evaluation Kit
sam_v71_xult.X | MPLABX project for SAM V71 Xplained Ultra Evaluation Kit

## Setting Up the Hardware

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

Project Name | Description
--- | ---
sam_e70_xult.X | SAM E70 Xplained Ultra Evaluation Kit
sam_v71_xult.X | SAM V71 Xplained Ultra Evaluation Kit

### Setting Up SAM E70 Xplained Ultra Evaluation Kit

- Plug an EEPROM 4 Click board into the mikroBUS socket on the board
- Connect a jumper between LED2 and PB08 on J203 header
- Connect the Debug USB port on the board to the computer using a micro USB cable

### Setting Up SAM V71 Xplained Ultra Evaluation Kit

- Connect a mikroBUS Xplained Pro board to the EXT1 header
- Plug an EEPROM 4 Click board into the mikroBUS socket of the mikroBUS Xplained Pro board
- 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 project using its IDE
2. LED indicates the success or failure:
   - The LED is turned ON when the value read from the EEPROM matched with the written value
   - The LED is turned OFF when the value read from the EEPROM did not match with the written value

The following table provides the LED names:

Board | LED Name
--- | ---
SAM E70 Xplained Ultra Evaluation Kit | LED2
SAM V71 Xplained Ultra Evaluation Kit | LED0