I2C EEPROM Driver

Block device driver for I2C based EEPROM devices such as the 24LC or AT24C series of devices.

EEPROM devices support much higher read/write cycles than flash based memory, at a cost in terms of size. Additionally, I2C EEPROM devices support byte-level read/writes with buffering of around 32bytes during writes.

Note: The I2C convention for EEPROM devices does not support inspection of the memory layout of the device, so the size must be specified during construction of the driver.

More info on EEPROM can be found on wikipedia: https://en.wikipedia.org/wiki/EEPROM

// Here's an example using a 24LC256 on a GR PEACH
#include "mbed.h"
#include "I2CEEBlockDevice.h"

// Create EEPROM device on I2C bus with 32kbytes of memory
I2CEEBlockDevice i2cee(D14, D15, 0xa0, 32*1024);

int main() {
    printf("i2cee test\n");

    // Initialize the device and print the memory layout
    i2cee.init();
    printf("i2cee size: %llu\n",         i2cee.size());
    printf("i2cee read size: %llu\n",    i2cee.get_read_size());
    printf("i2cee program size: %llu\n", i2cee.get_program_size());
    printf("i2cee erase size: %llu\n",   i2cee.get_erase_size());

    // Write "Hello World!" to the first block
    uint8_t *buffer = malloc(i2cee.get_erase_size());
    sprintf(buffer, "Hello World!\n");
    i2cee.erase(0, i2cee.get_erase_size());
    i2cee.program(buffer, 0, i2cee.get_erase_size());

    // Read back what was stored
    i2cee.read(buffer, 0, i2cee.get_erase_size());
    printf("%s", buffer);

    // Deinitialize the device
    i2cee.deinit();
}