把i2c.c 和 i2c.h写出来

以下是一个简单的I2C库函数的示例，包括i2c.c和i2c.h文件：

i2c.h:

#ifndef __I2C_H__
#define __I2C_H__

#include "stm32f10x.h"

void i2c_init(void);
void i2c_write(uint8_t addr, uint8_t *data, uint16_t len);
void i2c_read(uint8_t addr, uint8_t *data, uint16_t len);

#endif /* __I2C_H__ */

i2c.c:

#include "i2c.h"

#define I2C_SPEED 100000 // I2C总线速度，单位为Hz

void i2c_init(void)
{
    GPIO_InitTypeDef GPIO_InitStruct;
    I2C_InitTypeDef I2C_InitStruct;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); // 使能GPIOB时钟
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE); // 使能I2C1时钟

    // 配置GPIOB6和GPIOB7为复用推挽输出
    GPIO_InitStruct.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_OD;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStruct);

    // 配置I2C1为标准模式，时钟速度为100kHz
    I2C_InitStruct.I2C_Mode = I2C_Mode_I2C;
    I2C_InitStruct.I2C_DutyCycle = I2C_DutyCycle_2;
    I2C_InitStruct.I2C_OwnAddress1 = 0x00;
    I2C_InitStruct.I2C_Ack = I2C_Ack_Enable;
    I2C_InitStruct.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
    I2C_InitStruct.I2C_ClockSpeed = I2C_SPEED;
    I2C_Init(I2C1, &I2C_InitStruct);

    I2C_Cmd(I2C1, ENABLE); // 使能I2C1
}

void i2c_write(uint8_t addr, uint8_t *data, uint16_t len)
{
    uint32_t timeout = 0;
    while (I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY))
    {
        if (++timeout > 0x10000)
            return;
    }

    I2C_GenerateSTART(I2C1, ENABLE);
    timeout = 0;
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT))
    {
        if (++timeout > 0x10000)
            return;
    }

    I2C_Send7bitAddress(I2C1, addr << 1, I2C_Direction_Transmitter);
    timeout = 0;
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
    {
        if (++timeout > 0x10000)
            return;
    }

    while (len--)
    {
        I2C_SendData(I2C1, *data++);
        timeout = 0;
        while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
        {
            if (++timeout > 0x10000)
                return;
        }
    }

    I2C_GenerateSTOP(I2C1, ENABLE);
}

void i2c_read(uint8_t addr, uint8_t *data, uint16_t len)
{
    uint32_t timeout = 0;
    while (I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY))
    {
        if (++timeout > 0x10000)
            return;
    }

    I2C_GenerateSTART(I2C1, ENABLE);
    timeout = 0;
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT))
    {
        if (++timeout > 0x10000)
            return;
    }

    I2C_Send7bitAddress(I2C1, addr << 1, I2C_Direction_Receiver);
    timeout = 0;
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED))
    {
        if (++timeout > 0x10000)
            return;
    }

    while (len--)
    {
        if (len == 0)
            I2C_AcknowledgeConfig(I2C1, DISABLE);

        timeout = 0;
        while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED))
        {
            if (++timeout > 0x10000)
                return;
        }

        *data++ = I2C_ReceiveData(I2C1);
    }

    I2C_AcknowledgeConfig(I2C1, ENABLE);
    I2C_GenerateSTOP(I2C1, ENABLE);
}

需要注意的是，上述代码中的RCC_APB2PeriphClockCmd()、RCC_APB1PeriphClockCmd()和GPIO_Init()等函数需要根据具体的STM32开发板和引脚进行修改。同时还需要根据具体的I2C总线速度和使用的I2C模式来修改i2c_init()函数中的配置参数。