单片机外围设备-EEPROM

eeprom用iic通信。eeprom有几个特点需要关注：

1、可以单字节读写

2、eeprom按页划分存储，不同型号的eeprom的页大小不一致，往eeprom写数据时，如果写到了该页的末尾，会自动从该页的开头继续写，把之前的数据覆盖，读则不会。

/*
 * Copyright 2017 NXP
 * All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

/*  Standard C Included Files */
#include <stdio.h>
#include <string.h>
#include "pin_mux.h"
#include "clock_config.h"
#include "board.h"
#include "fsl_debug_console.h"
#include "fsl_lpi2c.h"

/*******************************************************************************
 * Definitions
 ******************************************************************************/
#define EEPROM_I2C_MASTER       (LPI2C3)
#define EEPROM_I2C_BAUD         (400000UL)

/* Select USB1 PLL (480 MHz) as master lpi2c clock source */
#define LPI2C_CLOCK_SOURCE_SELECT (0U)
/* Clock divider for master lpi2c clock source */
#define LPI2C_CLOCK_SOURCE_DIVIDER (5U)
/* Get frequency of lpi2c clock */
#define LPI2C_CLOCK_FREQUENCY ((CLOCK_GetFreq(kCLOCK_Usb1PllClk) / 8) / (LPI2C_CLOCK_SOURCE_DIVIDER + 1U))
#define LPI2C_MASTER_CLOCK_FREQUENCY LPI2C_CLOCK_FREQUENCY

#define AT24C256
#define EEPROM_PAGE_SIZE		64
#define EEPROM_SIZE				(32*1024)
#define EEPROM_ADDR_BYTES		2
#define EEPROM_WRITE_ADDRESS_8_BIT              (0xA2)
#define EEPROM_READ_ADDRESS_8_BIT               (0xA3)

/*******************************************************************************
 * Prototypes
 ******************************************************************************/

/*******************************************************************************
 * Variables
 *************************************************************************