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X-NUCLEO-EEPRMA2 EEPROM memory expansion board

boards/shields/x_nucleo_eeprma2/doc/index.rst

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.. _x_nucleo_eeprma2_shield:

X-NUCLEO-EEPRMA2 EEPROM memory expansion board ##############################################

Overview

The ST X-NUCLEO-EEPRMA2 expansion board can be used to evaluate M24xx series I2C and M95xx series SPI EEPROM devices. The X-NUCLEO-EEPRMA2 expansion board is compatible with the Arduino UNO R3 connector pin assignment. Additionally the pins are routed to dedicated headers and ST morpho connectors can be mounted if required.

The I2C EEPROMs are compatible with the atmel,at24 driver and the SPI EEPROMs are compatible with the atmel,at25 driver.

.. figure:: x_nucleo_eeprma2.jpg :align: center :alt: X-NUCLEO-EEPRMA2

More information about the board can be found at the X-NUCLEO-EEPRMA2 website_.

Requirements

This shield can only be used with a development board that provides a configuration for Arduino connectors and defines a node alias for the SPI or I2C interface (see :ref:shields for more details).

The SPI EEPROM devices can write protect complete memory blocks by setting the corresponding block protect bits in the status register. As the driver does not change this status register, make sure this protections are disabled in case writes to the EEPROM should be supported.

For more information about interfacing the M24xx and M95xx series EEPROM devices and the X-NUCLEO-EEPRMA2 in particular, see these ST Microelectronics documents:

  • X-NUCLEO-EEPRMA2 EEPROM memory expansion board User Manual_

  • M24C02-F Serial I2C bus EEPROM Datasheet_

  • M24256-DF Serial I2C bus EEPROM Datasheet_

  • M24M01-DF Serial I2C bus EEPROM Datasheet_

  • M95040-R Serial SPI bus EEPROM Datasheet_

  • M95256-DF Serial SPI bus EEPROM Datasheet_

  • M95M04-DR Serial SPI bus EEPROM Datasheet_

Samples

The :zephyr:code-sample:eeprom sample can be used to demonstrate the expansion boards functionality. Per default the shield sets an eeprom-0 alias for the M24C02-FMC6TG EEPROM, which can be overwritten to use the other EEPROM devices instead.

Programming

Set --shield x_nucleo_eeprma2 when you invoke west build. For example:

.. zephyr-app-commands:: :zephyr-app: samples/drivers/eeprom/ :board: nucleo_g0b1re :shield: x_nucleo_eeprma2 :goals: build

.. _X-NUCLEO-EEPRMA2 website: https://www.st.com/en/evaluation-tools/x-nucleo-eeprma2.html

.. _X-NUCLEO-EEPRMA2 EEPROM memory expansion board User Manual: https://www.st.com/resource/en/user_manual/dm00671710-getting-started-with-the-xnucleoeeprma2-standard-ic-and-spi-eeprom-memory-expansion-board-based-on-m24xx-and-m95xx-series-for-stm32-nucleo-stmicroelectronics.pdf

.. _M24C02-F Serial I2C bus EEPROM Datasheet: https://www.st.com/resource/en/datasheet/m24c02-f.pdf

.. _M24256-DF Serial I2C bus EEPROM Datasheet: https://www.st.com/resource/en/datasheet/m24256-df.pdf

.. _M24M01-DF Serial I2C bus EEPROM Datasheet: https://www.st.com/resource/en/datasheet/m24m01-df.pdf

.. _M95040-R Serial SPI bus EEPROM Datasheet: https://www.st.com/resource/en/datasheet/m95040-r.pdf

.. _M95256-DF Serial SPI bus EEPROM Datasheet: https://www.st.com/resource/en/datasheet/m95256-df.pdf

.. _M95M04-DR Serial SPI bus EEPROM Datasheet: https://www.st.com/resource/en/datasheet/m95m04-dr.pdf