STM32F429I-Discovery BSP User Manual: stm32f429i_discovery_eeprom.c File Reference

This file provides a set of functions needed to manage an I2C M24LR64 EEPROM memory. To be able to use this driver, the switch EE_M24LR64 must be defined in your toolchain compiler preprocessor.

Author:

MCD Application Team

Version:

V2.1.5

Date:

27-January-2017 =================================================================== Notes:

• This driver is intended for STM32F4xx families devices only.
• The I2C EEPROM memory (M24LR64) is available on separate daughter board ANT7-M24LR-A, which is not provided with the STM32F429I DISCOVERY board. To use this driver you have to connect the ANT7-M24LR-A to CN3 connector of STM32F429I DISCOVERY board. ===================================================================

It implements a high level communication layer for read and write from/to this memory. The needed STM32F4xx hardware resources (I2C and GPIO) are defined in stm32f429i_discovery.h file, and the initialization is performed in EEPROM_IO_Init() function declared in stm32f429i_discovery.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.

Regarding BSP_EEPROM_WritePage(), it is a 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 write 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 | +---------------------------------------+-----------+-------------+ | STM32F4xx 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 stm32f429i_discovery_eeprom.c.