eeprom_AT24C256_I2C驱动

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VIP免费原创最新推荐文章于 2026-09-16 16:15:19 发布 755 阅读 AI 写同款· GEO 优化 ›

AT24C256 EEPROM驱动开发与I²C时序工程实践 EEPROM（电可擦除可编程只读存储器）是一种关键的嵌入式非易失存储器件，广泛用于参数保存、日志缓存与安全密钥存储等场景。其核心原理基于I²C总线协议通信，依赖严格的时序约束（如tLOW、tSU:STA、ACK轮询机制）保障数据可靠性。技术价值体现在低功耗写入、字节级随机访问及无需高压编程等优势，显著区别于Flash存储器。典型应用场景包括工业传感器校准参数持久化、RTOS多任务下的安全配置管理，以及资源受限MCU平台（如STM32、ESP32）的轻量级数据备份。本文围绕AT24C256这一主流I²C EE 阅读详情

AT24C256 是256Kbit大小的eeprom，掉电仍可保留数据。本驱动实现了通过I2C总线对AT24C256的读写操作。

#include <asm/io.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/delay.h>
MODULE_LICENSE("Dual BSD/GPL");

#include "sti7105.h"
#include "stsys.h"
#include "stddefs.h"
#include "sti2c.h"
#include "stsys.h"
#define I2C1 0x01
//extern U32 at24c256_i2c1_cfg(void);
ST_DeviceName_t PIO_DeviceName[] = {"PIO0","PIO1","PIO2","PIO3","PIO4","PIO5","PIO6","PIO7","PIO8","PIO9","PIO10","PIO11","PIO12","PIO13","PIO14","PIO15","PIO16","PIO17","PIO18","PIO19","PIO20","PIO21","PIO22","PIO23","PIO24","PIO25","PIO26"};
static STI2C_Handle_t I2c_handle;
static U8 init_data[] =
{
 1, 0x00,
 2, 0xc0,
 3, 0x0a,
 4, 0xab,
 5, 0x08,
 6, 0x88,
 7, 0x00,
 8, 0xcd,
 9, 0x0f,
 10, 0xf0,
 11, 0x7f,
};
U32 static ee_i2c_write(U16 sub_addr,U8 *data,U16 data_size)
{
 
 STI2C_Params_t I2C_Params;
 U32 ErrCode;
 U32 nread ,nwrite;
 U8 buf_write[64];
// U8 buf_read[6