STM32H743I_EVAL BSP User Manual: stm32h743i_eval_eeprom.c File Reference

This file provides a set of functions needed to manage an I2C M24LR64 EEPROM memory.

Author:

MCD Application Team

Version:

V1.0.0

Date:

21-April-2017

            To be able to use this driver, the switch EE_M24LR64 must be defined
            in your toolchain compiler preprocessor

            ===================================================================
            Notes:
             - The I2C EEPROM memory (M24LR64) is available on separate daughter
               board ANT7-M24LR-A, which is not provided with the STM32H743I_EVAL
               board.
               To use this driver you have to connect the ANT7-M24LR-A to CN2
               connector of STM32H743I_EVAL board.
            ===================================================================

            It implements a high level communication layer for read and write
            from/to this memory. The needed STM32H7xx hardware resources (I2C and
            GPIO) are defined in stm32h743i_eval.h file, and the initialization is
            performed in EEPROM_IO_Init() function declared in stm32h743i_eval.c
            file.
            You can easily tailor this driver to any other development board,
            by just adapting the defines for hardware resources and
            EEPROM_IO_Init() function.

            @note In this driver, basic read and write functions (BSP_EEPROM_ReadBuffer()
                  and BSP_EEPROM_WritePage()) use DMA mode to perform the data
                  transfer to/from EEPROM memory.

           @note   Regarding BSP_EEPROM_WritePage(), it is an optimized function to perform
                  small write (less than 1 page) BUT the number of bytes (combined to write start address) must not
                  cross the EEPROM page boundary. This function can only writes into
                  the boundaries of an EEPROM page.
                  This function doesn't check on boundaries condition (in this driver
                  the function BSP_EEPROM_WriteBuffer() which calls BSP_EEPROM_WritePage() is
                  responsible of checking on Page boundaries).


       +-----------------------------------------------------------------+
       |               Pin assignment for M24LR64 EEPROM                 |
       +---------------------------------------+-----------+-------------+
       |  STM32H7xx I2C Pins                   |   EEPROM  |   Pin       |
       +---------------------------------------+-----------+-------------+
       | .                                     |   E0(GND) |    1  (0V)  |
       | .                                     |   AC0     |    2        |
       | .                                     |   AC1     |    3        |
       | .                                     |   VSS     |    4  (0V)  |
       | SDA                                   |   SDA     |    5        |
       | SCL                                   |   SCL     |    6        |
       | .                                     |   E1(GND) |    7  (0V)  |
       | .                                     |   VDD     |    8 (3.3V) |
       +---------------------------------------+-----------+-------------+
  

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Definition in file stm32h743i_eval_eeprom.c.