基于stc12c560s2单片机 收集到土壤湿度传感器的数据并且通过PCF8951转换芯片，显示在 lcd1602的代码

以下是一个基于STC12C560S2单片机的土壤湿度传感器数据采集和显示代码，您可以根据自己的需求进行修改和适配：

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

#define LCD1602_DB P0
sbit LCD1602_RS = P2^0;
sbit LCD1602_RW = P2^1;
sbit LCD1602_E = P2^2;

#define PCF8951_ADDR 0x90

sbit SDA=P1^1;
sbit SCL=P1^0;

void DelayMs(unsigned int ms) {
    unsigned int i, j;
    for (i = 0; i < ms; i++) {
        for (j = 0; j < 110; j++);
    }
}

void I2CStart() {
    SDA = 1;
    SCL = 1;
    _nop_();
    _nop_();
    _nop_();
    SDA = 0;
    _nop_();
    _nop_();
    _nop_();
    SCL = 0;
}

void I2CStop() {
    SDA = 0;
    SCL = 1;
    _nop_();
    _nop_();
    _nop_();
    SDA = 1;
    _nop_();
    _nop_();
    _nop_();
}

void I2CAck() {
    SDA = 0;
    _nop_();
    _nop_();
    _nop_();
    SCL = 1;
    _nop_();
    _nop_();
    _nop_();
    SCL = 0;
    _nop_();
    _nop_();
    _nop_();
    SDA = 1;
}

void I2CNack() {
    SDA = 1;
    _nop_();
    _nop_();
    _nop_();
    SCL = 1;
    _nop_();
    _nop_();
    _nop_();
    SCL = 0;
    _nop_();
    _nop_();
    _nop_();
    SDA = 1;
}

unsigned char I2CWriteByte(unsigned char dat) {
    unsigned char mask;
    for (mask = 0x80; mask != 0; mask >>= 1) {
        if ((mask & dat) == 0) {
            SDA = 0;
        } else {
            SDA = 1;
        }
        _nop_();
        _nop_();
        _nop_();
        SCL = 1;
        _nop_();
        _nop_();
        _nop_();
        SCL = 0;
    }
    SDA = 1;
    _nop_();
    _nop_();
    _nop_();
    SCL = 1;
    _nop_();
    _nop_();
    _nop_();
    if (SDA == 0) {
        SCL = 0;
        return 0;
    } else {
        SCL = 0;
        return 1;
    }
}

unsigned char I2CReadByte() {
    unsigned char mask;
    unsigned char dat = 0;
    SDA = 1;
    _nop_();
    _nop_();
    _nop_();
    for (mask = 0x80; mask != 0; mask >>= 1) {
        SCL = 1;
        _nop_();
        _nop_();
        _nop_();
        if (SDA == 1) {
            dat |= mask;
        }
        SCL = 0;
        _nop_();
        _nop_();
        _nop_();
    }
    SDA = 1;
    _nop_();
    _nop_();
    _nop_();
    return dat;
}

void LCD1602WriteCmd(unsigned char cmd) {
    LCD1602_RS = 0;
    LCD1602_RW = 0;
    LCD1602_DB = cmd;
    LCD1602_E = 1;
    _nop_();
    _nop_();
    _nop_();
    LCD1602_E = 0;
    DelayMs(2);
}

void LCD1602WriteData(unsigned char dat) {
    LCD1602_RS = 1;
    LCD1602_RW = 0;
    LCD1602_DB = dat;
    LCD1602_E = 1;
    _nop_();
    _nop_();
    _nop_();
    LCD1602_E = 0;
    DelayMs(2);
}

void LCD1602Init() {
    LCD1602WriteCmd(0x38);
    LCD1602WriteCmd(0x0c);
    LCD1602WriteCmd(0x06);
    LCD1602WriteCmd(0x01);
    DelayMs(5);
}

void PCF8951Init() {
    I2CStart();
    I2CWriteByte(PCF8951_ADDR);
    I2CWriteByte(0x01);
    I2CWriteByte(0x84);
    I2CStop();
}

unsigned int PCF8951Read() {
    unsigned char high, low;
    unsigned int val;
    I2CStart();
    I2CWriteByte(PCF8951_ADDR);
    I2CWriteByte(0x00);
    I2CStart();
    I2CWriteByte(PCF8951_ADDR | 0x01);
    high = I2CReadByte();
    I2CAck();
    low = I2CReadByte();
    I2CNack();
    I2CStop();
    val = ((unsigned int)high << 8) | low;
    return val;
}

void main() {
    unsigned int val;
    unsigned char str[6] = {0};
    LCD1602Init();
    PCF8951Init();
    while (1) {
        val = PCF8951Read();
        sprintf(str, "%u", val);
        LCD1602WriteCmd(0x01);
        LCD1602WriteCmd(0x80);
        LCD1602WriteData('H');
        LCD1602WriteData(':');
        LCD1602WriteData(str[0]);
        LCD1602WriteData(str[1]);
        LCD1602WriteData(str[2]);
        LCD1602WriteData(str[3]);
        LCD1602WriteData(str[4]);
        DelayMs(1000);
    }
}

以上是一个简单的例程，具体的细节和修改可以根据实际需求进行调整。