CubeMX设置
1. RCC,SYS,CLOCK CONFIGURATION设置
2. Usart和I2C设置
本案例设置好默认即可
代码
编写m24c02模块代码
m24c02.h
#ifndef __M24C02_H
#define __M24C02_H
#include "i2c.h"
// 宏定义
#define W_ADDR 0xA0
#define R_ADDR 0xA1
// 初始化
void M24C02_Init(void);
// 向EEPROM写入一个字节
void M24C02_WriteByte(uint8_t inneraddr, uint8_t byte);
// 从EEPROM读取一个字节
uint8_t M24C02_ReadByte(uint8_t inneraddr);
// 连续写入多个字节(页写)
void M24C02_WriteBytes(uint8_t inneraddr, uint8_t *bytes, uint8_t size);
// 连续读取多个字节
void M24C02_ReadBytes(uint8_t inneraddr, uint8_t *buffer, uint8_t size);
#endif
m24c02.c
#include "m24c02.h"
// 初始化
void M24C02_Init(void)
{
MX_I2C2_Init();
}
// 向EEPROM写入一个字节
void M24C02_WriteByte(uint8_t inneraddr, uint8_t byte)
{
HAL_I2C_Mem_Write(&hi2c2, W_ADDR, inneraddr, I2C_MEMADD_SIZE_8BIT, &byte, 1, 1000);
// 延迟等待写入周期结束
HAL_Delay(5);
}
// 从EEPROM读取一个字节
uint8_t M24C02_ReadByte(uint8_t inneraddr)
{
uint8_t byte = 0;
HAL_I2C_Mem_Read(&hi2c2, R_ADDR, inneraddr, I2C_MEMADD_SIZE_8BIT, &byte, 1, 1000);
return byte;
}
// 连续写入多个字节(页写)
void M24C02_WriteBytes(uint8_t inneraddr, uint8_t *bytes, uint8_t size)
{
HAL_I2C_Mem_Write(&hi2c2, W_ADDR, inneraddr, I2C_MEMADD_SIZE_8BIT, bytes, size, 1000);
// 延迟等待写入周期结束
HAL_Delay(5);
}
// 连续读取多个字节
void M24C02_ReadBytes(uint8_t inneraddr, uint8_t *buffer, uint8_t size)
{
HAL_I2C_Mem_Read(&hi2c2, R_ADDR, inneraddr, I2C_MEMADD_SIZE_8BIT, buffer, size, 1000);
}
main.c
/* USER CODE BEGIN Includes */
#include "m24c02.h"
#include <string.h>
/* USER CODE END Includes */
/* USER CODE BEGIN 2 */
printf("你好r\n");
// 2. 向EEPROM依次写入单个字符
M24C02_WriteByte(0x00, 'a');
M24C02_WriteByte(0x01, 'b');
M24C02_WriteByte(0x02, 'c');
// 3. 读取字符
uint8_t byte1 = M24C02_ReadByte(0x00);
uint8_t byte2 = M24C02_ReadByte(0x01);
uint8_t byte3 = M24C02_ReadByte(0x02);
// 4. 串口输出打印
printf("byte1 = %c\t byte2 = %c\t byte3 = %c\n", byte1, byte2, byte3);
// 5. 写入多个字符
M24C02_WriteBytes(0x00, "123456", 6);
// 6. 读取多个字符
uint8_t buffer[100] = {0};
M24C02_ReadBytes(0x00, buffer, 6);
// 7. 串口打印
printf("buffer = %s\n", buffer);
// 8. 测试超出16个字节的写入
// 清零缓冲区
memset(buffer, 0, sizeof(buffer));
M24C02_WriteBytes(0x00, "1234567890abcdefghijk", 21);
M24C02_ReadBytes(0x00, buffer, 21);
printf("buffer = %s\n", buffer);
/* USER CODE END 2 */usart.c
/* Includes ------------------------------------------------------------------*/
#include "usart.h"
/* USER CODE BEGIN 1 */
int fputc(int ch, FILE *f)
{
HAL_UART_Transmit(&huart1, (uint8_t *)&ch, 1, 1000);
return ch;
}
/* USER CODE END 1 */