mbed stm32EEPROM Library

The mbed stm32EEPROM Library allows you to write and read data (uint8_t) to the internal EEPROM of STM32L0xx and STM32L1xx microcontrollers, e.g. Nucleo-64 STM32L152RE.

Installation

1. "Download": https://github.com/sstaub/stm32EEPROM/archive/master.zip the Master branch from GitHub.
2. Unzip and modify the folder name to "stm32EEPROM"
3. Move the modified folder in your Library folder (e.g. in your lib folder inside PlatformIO).

How to use

First, include the stm32EEPROM.h to your project:

#include "stm32EEPROM.h"

Now, you can write and read data (uint8_t) to the internal EEPROM:

readEEPROMByte(5, 127); // write 127 to memory 5 of the EEPROM
uint8_t data = readEEPROMByte(5); // read the data of memory 5

IMPORTANT

The library is only tested with the Nucleo-64 STM32L152RE board. The maximum size of the EEPROM differs from type to type, e.g. Nucleo-64 STM32L152RE has 16kB EEPROM .

Example

First we delete old data and show the values (only zeros). Then we write some data to the first 255 memories and show the new values.

#include "mbed.h"
#include "stm32EEPROM.h"

int main() {
  wait_ms(3000);
  printf("Erasing old data\n");
  for (uint32_t i = 0; i < 256; i++) {
    writeEEPROMByte(i, 0);
    }
  for (uint32_t i = 0; i < 256; i++) {
    uint8_t storedValue = readEEPROMByte(i);
    printf("Stored value in address %lu is %d \n\r", i, storedValue);
    }
  printf("Writing new data\n");
  for (uint32_t i = 0; i < 256; i++) {
    writeEEPROMByte(i, (uint8_t)i);
    }
  printf("Ready\n");
  for (uint32_t i = 0; i < 256; i++) {
    uint8_t storedValue = readEEPROMByte(i);
    printf("Stored value in address %lu is %d \n\r", i, storedValue);
    }

Documentation

Functions

HAL_StatusTypeDef writeEEPROMByte(uint32_t address, uint8_t data)
Write a byte (uint8_t) to a given address (uint32_t) of the EEPROM. Return the HAL Status.

uint8_t readEEPROMByte(uint32_t address)
Read a byte (uint8_t) from a given address (uint32_t) of the EEPROM.