stm32 i2c eeprom 24C02

客官°小女子只卖身不卖艺 2022-06-10 09:51 167阅读 0赞

**电路图**  
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`相关文章:`[http://blog.csdn.net/zhangxuechao\_/article/details/74936798][http_blog.csdn.net_zhangxuechao_article_details_74936798]

![2][2 1]

**举例**

#define i2c_scl PBout(10)
    #define i2c_sda PBout(11)
    #define i2c_ack PBin(11)
    
    void I2C_init()
    {
        GPIO_InitTypeDef gpio10 = 
        {
            GPIO_Pin_10,
            GPIO_Speed_50MHz,
            GPIO_Mode_Out_PP
        };
    
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //时钟使能
    
        GPIO_Init(GPIOB, &gpio10);
    }
    
    void I2C_in()
    {
        GPIO_InitTypeDef gpio11 = 
        {
            GPIO_Pin_11,
            GPIO_Speed_50MHz,
            GPIO_Mode_IPD
        };
    
        GPIO_Init(GPIOB, &gpio11);
    }
    
    void I2C_out()
    {
        GPIO_InitTypeDef gpio11 = 
        {
            GPIO_Pin_11,
            GPIO_Speed_50MHz,
            GPIO_Mode_Out_PP
        };
    
        GPIO_Init(GPIOB, &gpio11);
    }
    
    void I2C_start()
    {
        I2C_out();
    
        i2c_sda = 1;
        i2c_scl = 1;
        delay_us(5);
        i2c_sda = 0;
        delay_us(5);
    
        i2c_scl = 0;
    }
    
    void I2C_stop()
    {
        I2C_out();
    
        i2c_sda = 0;
        i2c_scl = 1;
        delay_us(5);
        i2c_sda = 1;
        delay_us(5);
    
        i2c_scl = 0;
    }
    
    void I2C_ack(u8 ack)
    {
        i2c_scl = 0; //必须的
    
        I2C_out();
    
        i2c_sda = ack;  
        delay_us(2);    
        i2c_scl = 1;
        delay_us(5);
    
        i2c_scl = 0;
    }
    
    u8 I2C_wait_ack()
    {
        u8 flag = 0;
    
        I2C_in();
    
        i2c_scl = 1;
        delay_us(2);
    
        while(i2c_ack == 1)
        {
            flag++;
            if(flag > 250)
            {
                return 1;
            }
        }
        i2c_scl = 0;
    
        return 0;
    }
    
    void I2C_send_byte(u8 data)
    {
        u8 i = 0;
    
        I2C_out();
    
        i2c_scl = 0;
    
        for(i = 0; i < 8; i++)
        {
            if((data & 0x80) > 0)
                i2c_sda = 1;
            else
                i2c_sda = 0;            
            data <<= 1;
            delay_us(2);
    
            i2c_scl = 1;
            delay_us(2);
            i2c_scl = 0;
            delay_us(2);
        }
    }
    
    u8 I2C_recv_byte()
    {
        u8 i = 0;
        u8 data;
    
        I2C_in();
    
        for(i = 0; i < 8; i++)
        {
            i2c_scl = 0;
            delay_us(2);
            i2c_scl = 1;
            delay_us(2);
            data <<= 1;
            data |= i2c_ack;
            delay_us(2);
        }
    
        I2C_ack(0);
    
        return data;
    }
    
    void at24c02Write(u8 addr, u8 d)
    {
        I2C_start();
        I2C_send_byte(0xa0);
        I2C_wait_ack();
        I2C_send_byte(addr);
        I2C_wait_ack();
        I2C_send_byte(d);
        I2C_wait_ack();
        I2C_stop();  
    
        delay_ms(10);
    }
    
    u8 at24c02Read(u8 addr)
    {
        u8 d = 0;
    
        I2C_start();    
        I2C_send_byte(0xa0);
        I2C_wait_ack();
        I2C_send_byte(addr);
        I2C_wait_ack();
        I2C_start();    
        I2C_send_byte(0xa1);
        I2C_wait_ack();
        d = I2C_recv_byte();
        I2C_stop();
    
        return d;   
    }
    
    void at24c02Read_buf(u8 *buf, u8 addr, u16 num)
    {
        u8 i = 0;
    
        for(i = 0; i < num; i++)
        {
            buf[i] = at24c02Read(addr + i);
        }
    }
    
    void at24c02Write_buf(u8 *buf, u8 addr, u16 num)
    {
        u8 i = 0;
    
        for(i = 0; i < num; i++)
        {
            at24c02Write(addr + i, buf[i]);
        }
    }

[1]: /images/20220610/11ae4169d14341838e1592bb0c83aa45.png
[2]: /images/20220610/996b956956eb4f4e822810dba13ad31e.png
[http_blog.csdn.net_zhangxuechao_article_details_74936798]: http://blog.csdn.net/zhangxuechao_/article/details/74936798
[2 1]: /images/20220610/7320b438e2c64895ad3fcd6becc53572.png