写一个stm32f103使用软件i2c方式驱动at24c02的代码

很高兴为您解答这个问题！以下是使用软件I2C方式驱动AT24C02的STM32F103代码：

#include "stm32f10x.h"
#include "delay.h"

#define SDA GPIO_Pin_6
#define SCL GPIO_Pin_7
#define SDA_IN() {GPIOB->CRL&=0X0FFFFFFF;GPIOB->CRL|=(uint32_t)8<<28;}
#define SDA_OUT() {GPIOB->CRL&=0X0FFFFFFF;GPIOB->CRL|=(uint32_t)3<<28;}
#define IIC_SCL PBout(7) //SCL
#define IIC_SDA PBout(6) //SDA
#define READ_SDA PBin(6) //输入SDA

void IIC_Init(void)
{
        GPIO_InitTypeDef GPIO_InitStructure;
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
        GPIO_Init(GPIOB, &GPIO_InitStructure);

        IIC_SDA = 1;
        IIC_SCL = 1;
}

void IIC_Start(void)
{
        SDA_OUT();
        IIC_SDA = 1;
        IIC_SCL = 1;
        delay_us(4);
        IIC_SDA = 0;
        delay_us(4);
        IIC_SCL = 0;
}

void IIC_Stop(void)
{
        SDA_OUT();
        IIC_SCL = 0;
        IIC_SDA = 0;
        delay_us(4);
        IIC_SCL = 1;
        IIC_SDA = 1;
        delay_us(4);
}

u8 IIC_Wait_Ack(void)
{
        u8 ucErrTime = 0;
        SDA_IN();
        IIC_SDA = 1;
        delay_us(4);
        IIC_SCL = 1;
        delay_us(4);
        while (READ_SDA)
        {
                ucErrTime++;
                if (ucErrTime > 250)
                {
                        IIC_Stop();
                        return 1;
                }
                delay_us(1);
        }
        IIC_SCL = 0;
        return 0;
}

void IIC_Ack(void)
{
        IIC_SCL = 0;
        SDA_OUT();
        IIC_SDA = 0;
        delay_us(2);
        IIC_SCL = 1;
        delay_us(2);
        IIC_SCL = 0;
}

void IIC_NAck(void)
{
        IIC_SCL = 0;
        SDA_OUT();
        IIC_SDA = 1;
        delay_us(2);
        IIC_SCL = 1;
        delay_us(2);
        IIC_SCL = 0;
}

void IIC_Send_Byte(u8 txd)
{
        u8 t;
        SDA_OUT();
        IIC_SCL = 0;
        for (t = 0; t < 8; t++)
        {
                if ((txd & 0x80) >> 7)
                        IIC_SDA = 1;
                else
                        IIC_SDA = 0;
                txd <<= 1;
                delay_us(2);
                IIC_SCL = 1;
                delay_us(2);
                IIC_SCL = 0;
                delay_us(2);
        }
}

u8 IIC_Read_Byte(unsigned char ack)
{
        unsigned char i, receive = 0;
        SDA_IN();
        for (i = 0; i < 8; i++)
        {
                IIC_SCL = 0;
                delay_us(2);
                IIC_SCL = 1;
                receive <<= 1;
                if (READ_SDA)
                        receive++;
                delay_us(1);
        }
        if (ack)
                IIC_Ack();
        else
                IIC_NAck();
        return receive;
}

void AT24C02_WriteOneByte(u16 addr, u8 data)
{
        IIC_Start();
        IIC_Send_Byte(0xA0);
        IIC_Wait_Ack();
        IIC_Send_Byte(addr >> 8);
        IIC_Wait_Ack();
        IIC_Send_Byte(addr & 0xFF);
        IIC_Wait_Ack();
        IIC_Send_Byte(data);
        IIC_Wait_Ack();
        IIC_Stop();
        delay_ms(5);
}

u8 AT24C02_ReadOneByte(u16 addr)
{
        u8 temp;
        IIC_Start();
        IIC_Send_Byte(0xA0);
        IIC_Wait_Ack();
        IIC_Send_Byte(addr >> 8);
        IIC_Wait_Ack();
        IIC_Send_Byte(addr & 0xFF);
        IIC_Wait_Ack();
        IIC_Start();
        IIC_Send_Byte(0xA1);
        IIC_Wait_Ack();
        temp = IIC_Read_Byte(0);
        IIC_Stop();
        return temp;
}

int main(void)
{
        IIC_Init();
        while (1)
        {
                AT24C02_WriteOneByte(0x00, 0x01); //  在地址0x00写入数据0x01
                delay_ms(200);
                AT24C02_WriteOneByte(0x01, 0x02); //  在地址0x01写入数据0x02
                delay_ms(200);
                AT24C02_WriteOneByte(0x02, 0x03); //  在地址0x02写入数据0x03
                delay_ms(200);
                u8 val_0x00 = AT24C02_ReadOneByte(0x00); //  从地址0x00读取一个字节
                u8 val_0x01 = AT24C02_ReadOneByte(0x01); //  从地址0x01读取一个字节
                u8 val_0x02 = AT24C02_ReadOneByte(0x02); //  从地址0x02读取一个字节
                printf("val_0x00=%d, val_0x01=%d, val_0x02=%d\n", val_0x00, val_0x01, val_0x02); //  打印读取的结果
                delay_ms(1000);
        }
}

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