1.6 FLEXCOM SPI EEPROM Read Write

This example application shows how to use the FLEXCOM module in SPI mode.

Description

This application configures the FLEXCOM peripheral in SPI mode to read and write data from an external EEPROM memory chip. Data is written to the EEPROM and then read back and compared. Successful comparison is indicated by turning on an LED.

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/flexcom/spi/master/flexcom_spi_eeprom/firmware.

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

Project Name Description
sam_a5d2_xult.X MPLABX project for SAMA5D2 Xplained Ultra Evaluation Kit

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 configure, build and run bootstrap loader project and use it to bootstrap the application binaries.

Setting Up the Hardware

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

Project Name Description
sam_a5d2_xult.X SAMA5D2 Xplained Ultra Evaluation Kit

Setting Up SAMA5D2 Xplained Ultra Evaluation Kit

ADDITIONAL HARDWARE REQUIRED
SETTING UP THE BOARD
  • Short jumper JP2 (DEBUG_DIS)
  • Connect the Debug USB port on the board to the computer using a micro USB cable
  • Connect EEPROM 4 Click board to XPRO EXT1 (J25) connector on the board as per below Pin connections:
    XPRO EXT1 (J25) Pins EEPROM 4 CLICK Pins
    PIN 07 HLD
    PIN 09 WP
    PIN 10 CS
    PIN 15 SCK
    PIN 16 SDI
    PIN 17 SDO
    PIN 19 GND
    PIN 20 3V3

Running the Application

  1. Build the application using its IDE
  2. LED indicates the success or failure:
    • LED is turned ON when the value read from the EEPROM matched with the written value
    • LED is turned OFF when the value read from the EEPROM did not match with the written value
Following table provides the LED name:
Board LED Name
SAMA5D2 Xplained Ultra Evaluation Kit RGB_LED (Green)