基于STM32的三路IIC控制代码

以下是基于STM32的三路IIC控制代码示例：

#include "stm32f10x.h"

#define I2C1_SLAVE_ADDRESS 0x50
#define I2C2_SLAVE_ADDRESS 0x51
#define I2C3_SLAVE_ADDRESS 0x52

void I2C1_Configuration(void);
void I2C2_Configuration(void);
void I2C3_Configuration(void);

int main(void)
{
    uint8_t data[4] = {0x01, 0x02, 0x03, 0x04};
    
    I2C1_Configuration();
    I2C2_Configuration();
    I2C3_Configuration();
    
    while(1)
    {
        // I2C1 send data
        I2C_GenerateSTART(I2C1, ENABLE);
        while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
        I2C_Send7bitAddress(I2C1, I2C1_SLAVE_ADDRESS, I2C_Direction_Transmitter);
        while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
        for(int i=0; i<4; i++)
        {
            I2C_SendData(I2C1, data[i]);
            while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
        }
        I2C_GenerateSTOP(I2C1, ENABLE);
        
        // I2C2 receive data
        I2C_GenerateSTART(I2C2, ENABLE);
        while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT));
        I2C_Send7bitAddress(I2C2, I2C2_SLAVE_ADDRESS, I2C_Direction_Receiver);
        while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
        for(int i=0; i<4; i++)
        {
            while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_RECEIVED));
            data[i] = I2C_ReceiveData(I2C2);
        }
        I2C_GenerateSTOP(I2C2, ENABLE);
        
        // I2C3 send and receive data
        I2C_GenerateSTART(I2C3, ENABLE);
        while(!I2C_CheckEvent(I2C3, I2C_EVENT_MASTER_MODE_SELECT));
        I2C_Send7bitAddress(I2C3, I2C3_SLAVE_ADDRESS, I2C_Direction_Transmitter);
        while(!I2C_CheckEvent(I2C3, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
        for(int i=0; i<4; i++)
        {
            I2C_SendData(I2C3, data[i]);
            while(!I2C_CheckEvent(I2C3, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
        }
        I2C_GenerateSTOP(I2C3, ENABLE);
        
        I2C_GenerateSTART(I2C3, ENABLE);
        while(!I2C_CheckEvent(I2C3, I2C_EVENT_MASTER_MODE_SELECT));
        I2C_Send7bitAddress(I2C3, I2C3_SLAVE_ADDRESS, I2C_Direction_Receiver);
        while(!I2C_CheckEvent(I2C3, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
        for(int i=0; i<4; i++)
        {
            while(!I2C_CheckEvent(I2C3, I2C_EVENT_MASTER_BYTE_RECEIVED));
            data[i] = I2C_ReceiveData(I2C3);
        }
        I2C_GenerateSTOP(I2C3, ENABLE);
    }
}

void I2C1_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    I2C_InitTypeDef I2C_InitStructure;
    
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
    
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_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 << 1;
    I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
    I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
    I2C_InitStructure.I2C_ClockSpeed = 100000;
    I2C_Init(I2C1, &I2C_InitStructure);
    I2C_Cmd(I2C1, ENABLE);
}

void I2C2_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    I2C_InitTypeDef I2C_InitStructure;
    
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
    
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);
    
    I2C_DeInit(I2C2);
    I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
    I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
    I2C_InitStructure.I2C_OwnAddress1 = I2C2_SLAVE_ADDRESS << 1;
    I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
    I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
    I2C_InitStructure.I2C_ClockSpeed = 100000;
    I2C_Init(I2C2, &I2C_InitStructure);
    I2C_Cmd(I2C2, ENABLE);
}

void I2C3_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    I2C_InitTypeDef I2C_InitStructure;
    
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C3, ENABLE);
    
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOC, &GPIO_InitStructure);
    
    I2C_DeInit(I2C3);
    I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
    I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
    I2C_InitStructure.I2C_OwnAddress1 = I2C3_SLAVE_ADDRESS << 1;
    I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
    I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
    I2C_InitStructure.I2C_ClockSpeed = 100000;
    I2C_Init(I2C3, &I2C_InitStructure);
    I2C_Cmd(I2C3, ENABLE);
}

以上代码中，使用了三个I2C总线，分别连接三个从设备。在每次循环中，首先使用I2C1总线发送数据，然后使用I2C2总线接收数据，最后使用I2C3总线同时发送和接收数据。在每个I2C总线的初始化函数中，配置GPIO和I2C参数，并使能I2C总线。对于每个I2C总线，需要使用不同的GPIO引脚和从设备地址。在每个数据传输过程中，需要检查I2C事件是否发生，并根据事件类型进行相应的操作。例如，在发送数据时，需要等待主模式选择事件、主模式发送器已选择事件和字节传输完成事件。在接收数据时，需要等待主模式选择事件、主模式接收器已选择事件和字节接收完成事件。