请基于C51单片机使用C语言编写BMP280的驱动程序

好的，以下是基于C51单片机使用C语言编写BMP280的驱动程序的示例代码：

#include <reg52.h>
#include <intrins.h>

// 定义BMP280的I2C地址，BMP280的默认地址为0x76
#define BMP280_ADDR 0x76

// 定义BMP280的寄存器地址
#define BMP280_REG_CTRL_MEAS 0xF4
#define BMP280_REG_CONFIG 0xF5
#define BMP280_REG_PRESS_MSB 0xF7
#define BMP280_REG_PRESS_LSB 0xF8
#define BMP280_REG_PRESS_XLSB 0xF9
#define BMP280_REG_TEMP_MSB 0xFA
#define BMP280_REG_TEMP_LSB 0xFB
#define BMP280_REG_TEMP_XLSB 0xFC

// 定义BMP280的初始化参数
#define BMP280_INIT_PARAM1 0x27
#define BMP280_INIT_PARAM2 0xA0

// 定义BMP280的校准参数
signed short bmp280_calib_param[24];

// I2C总线初始化函数
void I2C_Init()
{
    SDA = 1;
    SCL = 1;
}

// I2C总线起始信号函数
void I2C_Start()
{
    SDA = 1;
    _nop_();
    SCL = 1;
    _nop_();
    SDA = 0;
    _nop_();
    SCL = 0;
}

// I2C总线停止信号函数
void I2C_Stop()
{
    SDA = 0;
    _nop_();
    SCL = 1;
    _nop_();
    SDA = 1;
    _nop_();
}

// I2C总线应答信号函数
void I2C_Ack()
{
    SDA = 0;
    _nop_();
    SCL = 1;
    _nop_();
    SCL = 0;
    _nop_();
    SDA = 1;
    _nop_();
}

// I2C总线非应答信号函数
void I2C_NAck()
{
    SDA = 1;
    _nop_();
    SCL = 1;
    _nop_();
    SCL = 0;
    _nop_();
    SDA = 1;
    _nop_();
}

// I2C总线发送一个字节的数据函数
void I2C_SendByte(unsigned char dat)
{
    unsigned char i;
    for (i = 0; i < 8; i++)
    {
        SDA = dat & 0x80;
        _nop_();
        SCL = 1;
        _nop_();
        SCL = 0;
        _nop_();
        dat <<= 1;
    }
    SDA = 1;
    _nop_();
    SCL = 1;
    _nop_();
    SCL = 0;
    _nop_();
}

// I2C总线接收一个字节的数据函数
unsigned char I2C_RecvByte()
{
    unsigned char i;
    unsigned char dat = 0;
    SDA = 1;
    for (i = 0; i < 8; i++)
    {
        dat <<= 1;
        SCL = 1;
        _nop_();
        if (SDA)
            dat++;
        SCL = 0;
        _nop_();
    }
    return dat;
}

// BMP280初始化函数
void BMP280_Init()
{
    I2C_Start();
    I2C_SendByte(BMP280_ADDR << 1);
    I2C_SendByte(BMP280_REG_CTRL_MEAS);
    I2C_SendByte(BMP280_INIT_PARAM1);
    I2C_Stop();
    I2C_Start();
    I2C_SendByte(BMP280_ADDR << 1);
    I2C_SendByte(BMP280_REG_CONFIG);
    I2C_SendByte(BMP280_INIT_PARAM2);
    I2C_Stop();
}

// BMP280读取校准参数函数
void BMP280_ReadCalibParam()
{
    unsigned char i;
    I2C_Start();
    I2C_SendByte(BMP280_ADDR << 1);
    I2C_SendByte(0x88);
    I2C_Stop();
    I2C_Start();
    I2C_SendByte((BMP280_ADDR << 1) | 1);
    for (i = 0; i < 24; i++)
    {
        bmp280_calib_param[i] = I2C_RecvByte();
        if (i == 7 || i == 15)
            i++;
    }
    I2C_NAck();
    I2C_Stop();
}

// BMP280读取温度函数
signed long BMP280_ReadTemperature()
{
    signed long adc_T;
    signed long var1, var2, T;
    I2C_Start();
    I2C_SendByte(BMP280_ADDR << 1);
    I2C_SendByte(BMP280_REG_TEMP_MSB);
    I2C_Stop();
    I2C_Start();
    I2C_SendByte((BMP280_ADDR << 1) | 1);
    adc_T = (signed long)I2C_RecvByte() << 12;
    adc_T |= (signed long)I2C_RecvByte() << 4;
    adc_T |= (signed long)I2C_RecvByte() >> 4;
    I2C_NAck();
    I2C_Stop();
    var1 = ((((adc_T >> 3) - ((signed long)bmp280_calib_param[0] << 1))) * ((signed long)bmp280_calib_param[1])) >> 11;
    var2 = (((((adc_T >> 4) - ((signed long)bmp280_calib_param[0])) * ((adc_T >> 4) - ((signed long)bmp280_calib_param[0]))) >> 12) * ((signed long)bmp280_calib_param[2])) >> 14;
    T = var1 + var2;
    return T;
}

// BMP280读取气压函数
signed long BMP280_ReadPressure()
{
    signed long adc_P;
    signed long var1, var2, p;
    BMP280_ReadTemperature();
    I2C_Start();
    I2C_SendByte(BMP280_ADDR << 1);
    I2C_SendByte(BMP280_REG_PRESS_MSB);
    I2C_Stop();
    I2C_Start();
    I2C_SendByte((BMP280_ADDR << 1) | 1);
    adc_P = (signed long)I2C_RecvByte() << 12;
    adc_P |= (signed long)I2C_RecvByte() << 4;
    adc_P |= (signed long)I2C_RecvByte() >> 4;
    I2C_NAck();
    I2C_Stop();
    var1 = (((signed long)bmp280_calib_param[4]) * (((((signed long)bmp280_calib_param[2]) * ((signed long)bmp280_calib_param[2])) >> 12) << 10)) >> 20;
    var2 = (((signed long)bmp280_calib_param[1]) * ((signed long)bmp280_calib_param[3])) >> 13;
    p = ((signed long)adc_P) + var1 + var2 + (((signed long)bmp280_calib_param[5]) << 8);
    return p;
}

// 主函数
void main()
{
    signed long temp, press;
    I2C_Init();
    BMP280_Init();
    BMP280_ReadCalibParam();
    while (1)
    {
        temp = BMP280_ReadTemperature() / 100;
        press = BMP280_ReadPressure() / 100;
        // 在此处将温度和气压值输出到LCD屏幕上或者通过串口发送到上位机
    }
}

以上代码仅供参考，具体实现可能需要根据实际情况进行修改。