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STM32读写EEPROM

news 2025/9/16 9:37:48

代码如下

#include "i2c.h"
#include <string.h>/* M24C64设备地址（A0/A1/A2接地，7位地址为0x50，左移1位后为0xA0） */
#define EEPROM_ADDR           (0x50 << 1)
#define M24C64_PAGE_SIZE      32          // 页面大小：32字节
#define M24C64_WRITE_DELAY_MS 5           // 写入周期：5毫秒
#define EEPROM_PARAM_ADDR     0x0000      // EEPROM参数存储起始地址// 参数结构体定义
typedef struct {uint8_t data[256]; // 数据缓冲区：256字节
} Param_t;/*** @brief  向M24C64 EEPROM写入Param_t结构体数据* @param  hi2c: I2C句柄指针* @param  param: 指向要写入的Param_t结构体的指针* @retval HAL_StatusTypeDef: HAL_OK表示成功，HAL_ERROR表示失败*/
HAL_StatusTypeDef EEPROM_WriteParam(I2C_HandleTypeDef *hi2c, Param_t *param)
{uint8_t *data = (uint8_t *)param; // 将结构体转换为字节数组uint16_t size = sizeof(Param_t);  // Param_t结构体大小（256字节）uint16_t addr = EEPROM_PARAM_ADDR; // 当前内存地址uint16_t bytes_written = 0;       // 已写入字节计数while (bytes_written < size) {// 计算当前页面剩余字节数uint16_t page_remain = M24C64_PAGE_SIZE - (addr % M24C64_PAGE_SIZE);// 确定本次写入的块大小（取剩余数据或页面剩余空间的最小值）uint16_t chunk_size = (size - bytes_written) > page_remain ? page_remain : (size - bytes_written);// 准备16位地址字节（高字节在前）uint8_t addr_bytes[2] = { (uint8_t)(addr >> 8), (uint8_t)(addr & 0xFF) };// 合并地址和数据到缓冲区uint8_t buffer[M24C64_PAGE_SIZE + 2];buffer[0] = addr_bytes[0];buffer[1] = addr_bytes[1];memcpy(&buffer[2], &data[bytes_written], chunk_size);// 向EEPROM写入数据if (HAL_I2C_Master_Transmit(hi2c, EEPROM_ADDR, buffer, chunk_size + 2, HAL_MAX_DELAY) != HAL_OK) {return HAL_ERROR;}// 等待EEPROM写入周期完成
        HAL_Delay(M24C64_WRITE_DELAY_MS);// 更新地址和已写入字节数bytes_written += chunk_size;addr += chunk_size;}return HAL_OK;
}/*** @brief  从M24C64 EEPROM读取Param_t结构体数据* @param  hi2c: I2C句柄指针* @param  param: 指向存储读取数据的Param_t结构体的指针* @retval HAL_StatusTypeDef: HAL_OK表示成功，HAL_ERROR表示失败*/
HAL_StatusTypeDef EEPROM_ReadParam(I2C_HandleTypeDef *hi2c, Param_t *param)
{uint8_t data[sizeof(Param_t)]; // 存储原始数据的缓冲区uint16_t mem_addr = EEPROM_PARAM_ADDR; // 读取起始地址// 从EEPROM读取数据if (HAL_I2C_Mem_Read(hi2c, EEPROM_ADDR, mem_addr, I2C_MEMADD_SIZE_16BIT, data, sizeof(Param_t), HAL_MAX_DELAY) != HAL_OK) {return HAL_ERROR;}// 将原始数据复制到Param_t结构体memcpy(param, data, sizeof(Param_t));return HAL_OK;
}/*** @brief  测试EEPROM的写入和读取功能* @param  无* @retval 无*/
void EEPROM_Test(void)
{Param_t write_param; // 用于写入测试的结构体Param_t read_param;  // 用于读取测试的结构体// 用测试数据填充write_param（0到255的循环模式）for (uint16_t i = 0; i < sizeof(Param_t); i++) {write_param.data[i] = (uint8_t)(i % 256);}// 向EEPROM写入数据printf("正在写入数据到EEPROM...\n");if (EEPROM_WriteParam(&hi2c2, &write_param) == HAL_OK) {printf("写入成功！\n");} else {printf("写入失败！\n");}// 从EEPROM读取数据printf("正在从EEPROM读取数据...\n");if (EEPROM_ReadParam(&hi2c2, &read_param) == HAL_OK) {printf("读取成功！\n");} else {printf("读取失败！\n");}
}