基于STM32的IIC slave代码实现

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已于 2022-11-06 11:52:45 修改

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文章标签： stm32 单片机 arm

于 2022-11-06 11:22:00 首次发布

本文链接：https://blog.youkuaiyun.com/weixin_45527959/article/details/127709041

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本文详细介绍了如何在STM32单片机上配置IIC外设，利用中断服务函数实现从模式下的通信过程，通过结构体IIC_P_CmdStr管理接收和发送数据。

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使用MCU的IIC外设，通过配置寄存器和使用中断的实现IIC 从模式的通信。
IIC配置代码如下：

void I2C1_GPIO_Configuration(void)
{
   
    GPIO_InitTypeDef  GPIO_InitStructure;
    // SCL PB6
    // SDA PB7
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD; //必须设置为开漏输出，实现iic的线与逻辑
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

//    GPIO_PinAFConfig(GPIOB,GPIO_PinSource6,GPIO_AF_I2C1); 
//    GPIO_PinAFConfig(GPIOB,GPIO_PinSource7,GPIO_AF_I2C1);
}

void I2C1_Configuration(void)
{
   
    I2C_InitTypeDef I2C_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    I2C_DeInit(I2C1);
    I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
    I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
    I2C_InitStructure.I2C_OwnAddress1 = I2C1_Slave_Address; //从机地址，一定要设置正确                          
    I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
    I2C_InitStructure.I2C_AcknowledgedAddress= I2C_AcknowledgedAddress_7bit;
    I2C_InitStructure.I2C_ClockSpeed = 10000;
    I2C_Init(I2C1, &I2C_InitStructure);
	
	
	
    NVIC_InitStructure.NVIC_IRQChannel                   = I2C1_EV_IRQn;//事件中断
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority        = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd                = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    NVIC_InitStructure.NVIC_IRQChannel = I2C1_ER_IRQn;//错误中断
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;                 
    NVIC_InitStructure.NVIC_IRQChannelCmd                = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    I2C_ITConfig(I2C1, I2C_IT_BUF | I2C_IT_EVT |I2C_IT_ERR, ENABLE);   
    I2C_Cmd(I2C1, ENABLE);                                             
}

void I2C1_Init(

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