ds2740的c51程序

以下是一个简单的C51程序，用于读取DS2740芯片的电流和温度数据。这个程序假设DS2740芯片的I2C地址是0x2C，并且使用I2C总线。请注意，您需要根据您的硬件配置和应用程序的需求修改此程序。

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

#define DS2740_ADDRESS 0x2C

void i2c_start();
void i2c_stop();
void i2c_write(unsigned char dat);
unsigned char i2c_read(unsigned char ack);
void delay(unsigned int ms);

void main() {
    unsigned char msb, lsb;
    int current;
    unsigned char temperature;

    while(1) {
        i2c_start();
        i2c_write(DS2740_ADDRESS << 1);
        i2c_write(0x00); // Select Current Register
        i2c_start();
        i2c_write((DS2740_ADDRESS << 1) | 0x01);
        msb = i2c_read(1);
        lsb = i2c_read(0);
        i2c_stop();

        current = (msb << 8) | lsb;
        current = current / 10; // Convert to milliamps

        i2c_start();
        i2c_write(DS2740_ADDRESS << 1);
        i2c_write(0x01); // Select Temperature Register
        i2c_start();
        i2c_write((DS2740_ADDRESS << 1) | 0x01);
        temperature = i2c_read(0);
        i2c_stop();

        printf("Current: %d mA, Temperature: %d C\n", current, temperature);
        delay(1000);
    }
}

void i2c_start() {
    SDA = 1;
    SCL = 1;
    _nop_();
    SDA = 0;
    _nop_();
    SCL = 0;
}

void i2c_stop() {
    SDA = 0;
    SCL = 1;
    _nop_();
    SDA = 1;
    _nop_();
    SCL = 0;
}

void i2c_write(unsigned char dat) {
    unsigned char i;
    for(i = 0; i < 8; i++) {
        SDA = (dat & 0x80) >> 7;
        dat <<= 1;
        _nop_();
        SCL = 1;
        _nop_();
        SCL = 0;
    }
    SDA = 1;
    _nop_();
    SCL = 1;
    _nop_();
    SCL = 0;
}

unsigned char i2c_read(unsigned char ack) {
    unsigned char i, dat = 0;
    SDA = 1;
    for(i = 0; i < 8; i++) {
        dat <<= 1;
        SCL = 1;
        _nop_();
        dat |= SDA;
        _nop_();
        SCL = 0;
    }
    SDA = ack;
    _nop_();
    SCL = 1;
    _nop_();
    SCL = 0;
    return dat;
}

void delay(unsigned int ms) {
    unsigned int i, j;
    for(i = 0; i < ms; i++) {
        for(j = 0; j < 1000; j++);
    }
}

该程序使用C51单片机的GPIO口模拟I2C总线与DS2740芯片通信，并读取电流和温度数据。在程序中，i2c_start()、i2c_stop()、i2c_write()和i2c_read()函数实现了I2C总线的基本操作。该程序使用printf()函数将电流和温度数据输出到串口。请注意，您需要在编译和烧写程序之前配置您的开发环境。