STM32的IIC（模拟）读写AT24c02

以下是STM32的IIC（模拟）读写AT24c02的代码：

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

#define IIC_SCL_H   GPIOB->BSRR = GPIO_Pin_10
#define IIC_SCL_L   GPIOB->BRR = GPIO_Pin_10
#define IIC_SDA_H   GPIOB->BSRR = GPIO_Pin_11
#define IIC_SDA_L   GPIOB->BRR = GPIO_Pin_11
#define IIC_SDA     GPIOB->IDR & GPIO_Pin_11

void IIC_Start()
{
    IIC_SDA_H;
    IIC_SCL_H;
    delay_us(5);
    IIC_SDA_L;
    delay_us(5);
    IIC_SCL_L;
}

void IIC_Stop()
{
    IIC_SDA_L;
    IIC_SCL_H;
    delay_us(5);
    IIC_SDA_H;
    delay_us(5);
}

void IIC_Ack()
{
    IIC_SDA_L;
    delay_us(5);
    IIC_SCL_H;
    delay_us(5);
    IIC_SCL_L;
    IIC_SDA_H;
}

void IIC_NoAck()
{
    IIC_SDA_H;
    delay_us(5);
    IIC_SCL_H;
    delay_us(5);
    IIC_SCL_L;
}

uint8_t IIC_WaitAck()
{
    uint8_t ucErrTime = 0;
    IIC_SDA_H;
    delay_us(1);
    IIC_SCL_H;
    delay_us(1);
    while (IIC_SDA)
    {
        ucErrTime++;
        if (ucErrTime > 250)
        {
            IIC_Stop();
            return 1;
        }
    }
    IIC_SCL_L;
    return 0;
}

void IIC_SendByte(uint8_t ucByte)
{
    uint8_t i;
    for (i = 0; i < 8; i++)
    {
        if ((ucByte << i) & 0x80)
        {
            IIC_SDA_H;
        }
        else
        {
            IIC_SDA_L;
        }
        delay_us(1);
        IIC_SCL_H;
        delay_us(1);
        IIC_SCL_L;
    }
}

uint8_t IIC_ReadByte()
{
    uint8_t i, ucByte = 0;
    IIC_SDA_H;
    for (i = 0; i < 8; i++)
    {
        ucByte <<= 1;
        IIC_SCL_H;
        delay_us(1);
        if (IIC_SDA)
        {
            ucByte |= 0x01;
        }
        IIC_SCL_L;
        delay_us(1);
    }
    return ucByte;
}

void IIC_Init()
{
    GPIO_InitTypeDef GPIO_InitStruct;
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
    GPIO_InitStruct.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_OD;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStruct);
    IIC_SDA_H;
    IIC_SCL_H;
}

void AT24C02_WriteByte(uint8_t ucAddr, uint8_t ucData)
{
    IIC_Start();
    IIC_SendByte(0xa0);
    IIC_WaitAck();
    IIC_SendByte(ucAddr);
    IIC_WaitAck();
    IIC_SendByte(ucData);
    IIC_WaitAck();
    IIC_Stop();
    delay_ms(10);
}

uint8_t AT24C02_ReadByte(uint8_t ucAddr)
{
    uint8_t ucData;
    IIC_Start();
    IIC_SendByte(0xa0);
    IIC_WaitAck();
    IIC_SendByte(ucAddr);
    IIC_WaitAck();
    IIC_Start();
    IIC_SendByte(0xa1);
    IIC_WaitAck();
    ucData = IIC_ReadByte();
    IIC_NoAck();
    IIC_Stop();
    return ucData;
}

int main(void)
{
    uint8_t ucData;
    IIC_Init();
    AT24C02_WriteByte(0x00, 0x55);
    ucData = AT24C02_ReadByte(0x00);
    while (1);
}