1.13 SPI EEPROM AT25 Driver - EEPROM Read Write

This example application shows how to use the AT25 driver to perform read and write operations on AT25 series of EEPROM.

Description

This example uses the AT25 driver to communicate with the SPI based AT25 series of external EEPROMs to perform write and read operations in Bare-Metal environment.

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/driver/spi_eeprom/at25/at25_eeprom_read_write/firmware.

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

Project NameDescription
sam_9x75_curiosity.XMPLABX project for SAM9X75 Curiosity Development Board

Setting Up AT91Bootstrap loader

To load the application binary onto the target device, we need to use at91bootstrap loader. Refer to the at91bootstrap loader documentation for details on how to use it to bootstrap the application binaries.

Setting Up the Hardware

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

Project NameDescription
sam_9x75_curiosity.XSAM9X75 Curiosity Development Board

Setting Up SAM9X75 Curiosity Development Board

Additional hardware required:
Setting up the board:
  • Insert EEPROM 4 Click board into MikroBus1 (J25) Connector.
  • Connect the UART DEBUG J35 on board to the computer using a UART-FTDI cable (to enable debug com port)
  • Connect the USB port J2 on board to the computer using a micro USB cable (to power the board)

Running the Application

  1. Build the application using its IDE
  2. The LED is turned ON when the value read from EEPROM matches with the written data
Refer to the following table for LED name:
BoardLED Name
SAM9X75 Curiosity Development BoardRGB_LED (Blue)