用STM32实现模拟iiC软件配置的代码

以下是基于STM32实现模拟I2C软件配置的代码：

#include "stm32f10x.h"

#define SDA_OUT()  GPIOB->CRL &= 0X0FFFFFFF;GPIOB->CRL |= 0x30000000//PB6输出模式
#define SDA_IN()   GPIOB->CRL &= 0X0FFFFFFF;GPIOB->CRL |= 0x80000000//PB6输入模式
#define IIC_SCL    PBout(7) //SCL
#define IIC_SDA    PBout(6) //SDA
#define READ_SDA   PBin(6)  //SDA IN

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_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);
    IIC_SCL = 1;
    IIC_SDA = 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(1);
    IIC_SCL = 1;
    delay_us(1);
    while (READ_SDA) {
        ucErrTime++;
        if (ucErrTime > 250) {
            IIC_Stop();
            return 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_NAck();
    else
        IIC_Ack();
    return receive;
}

u8 single_write(u8 addr, u8 reg, u8 data)
{
    u8 res;
    IIC_Start();
    IIC_Send_Byte(addr << 1 | 0);
    res = IIC_Wait_Ack();
    IIC_Send_Byte(reg);
    res |= IIC_Wait_Ack();
    IIC_Send_Byte(data);
    res |= IIC_Wait_Ack();
    IIC_Stop();
    return res;
}

u8 single_read(u8 addr, u8 reg, u8* data)
{
    u8 res;
    IIC_Start();
    IIC_Send_Byte(addr << 1 | 0);
    res = IIC_Wait_Ack();
    IIC_Send_Byte(reg);
    res |= IIC_Wait_Ack();
    IIC_Start();
    IIC_Send_Byte(addr << 1 | 1);
    res |= IIC_Wait_Ack();
    *data = IIC_Read_Byte(0);
    IIC_Stop();
    return res;
}

注：以上代码仅供参考，具体实现要根据自己的硬件和需求进行修改。