stc89c52rc单片机上电检测完整代码

以下是一个基于 stc89c52rc 单片机的上电检测的完整代码，仅供参考：

#include <reg52.h>

sbit power_on = P3^4; //上电检测引脚

void main()
{
    while(power_on); //等待上电检测引脚为高电平

    //执行上电后的操作
    //TODO: 在这里添加代码

    while(1); //程序进入死循环
}

该代码实现了一个简单的上电检测程序，其中使用了单片机的 P3.4 引脚作为上电检测引脚，程序将在该引脚检测到高电平后执行后续的操作。需要注意的是，该代码仅供参考，具体的上电检测引脚和后续操作需根据具体的硬件和软件需求进行调整和优化。

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stc89c52rc单片机驱动直流电机完整代码

以下是一个简单的 stc89c52rc 单片机驱动直流电机的完整代码，仅供参考：

#include <reg52.h>

sbit motor_pin1 = P1^0; //电机PWM输出端口1
sbit motor_pin2 = P1^1; //电机PWM输出端口2

void pwm_init() //初始化PWM输出
{
    TMOD |= 0x01; //设置定时器0为模式1
    TH0 = 0xFC; //装载定时器初值，使PWM频率为1000Hz
    TL0 = 0x67;
    ET0 = 1; //允许定时器0中断
    EA = 1; //允许总中断
    TR0 = 1; //启动定时器0
}

void main()
{
    pwm_init(); //初始化PWM输出

    while(1)
    {
        motor_pin1 = 1; //使电机转动
        motor_pin2 = 0;
    }
}

void timer0() interrupt 1 //定时器0中断服务程序
{
    static unsigned char pwm_count = 0; //静态计数器

    TH0 = 0xFC; //重新装载初值
    TL0 = 0x67;

    pwm_count++; //计数器自加

    if(pwm_count < 50) //占空比为50%
    {
        motor_pin1 = 1; //PWM输出高电平
    }
    else //占空比为50%
    {
        motor_pin1 = 0; //PWM输出低电平
    }

    if(pwm_count >= 100) //计数器归零
    {
        pwm_count = 0;
        motor_pin2 = 1; //PWM输出低电平
    }
}

该代码实现了一个简单的直流电机控制程序，其中使用了单片机的定时器0中断功能和PWM功能来控制电机的转速和方向。需要注意的是，该代码仅供参考，具体实现方法需要根据具体的电机参数和控制需求进行调整和优化。

用stc89c52rc单片机为辅机和stc15w408as单片机为主机进行串口通信的代码，让stc89c52rc单片机通过矩阵按键1或者2发送指令，stc15w408as单片机进行接收，相对应按键后让P5^4为引脚的LED亮，让stc89c52rc单片机在ld1602显示的温度数加1，相反减1

以下是用stc89c52rc单片机为辅机和stc15w408as单片机为主机进行串口通信的代码：

stc89c52rc单片机代码：

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

#define FOSC 11059200L
#define BAUD 9600
#define TIMER_1MS (65536-FOSC/12/1000)

sbit Matrix1 = P2^0;
sbit Matrix2 = P2^1;

unsigned char TxdData;
unsigned char ReceiveData;
unsigned char TxdFlag = 0;

void SendData(unsigned char dat);
void DelayMs(unsigned int ms);
void InitUart();
void MatrixScan();

void main()
{
    InitUart();
    while(1)
    {
        MatrixScan();
        if(Matrix1 == 0)
        {
            SendData('1');
            while(Matrix1 == 0);
            P5^4 = 1;
            DelayMs(10);
            P5^4 = 0;
        }
        if(Matrix2 == 0)
        {
            SendData('2');
            while(Matrix2 == 0);
            P5^4 = 1;
            DelayMs(10);
            P5^4 = 0;
        }
    }
}

void SendData(unsigned char dat)
{
    SBUF = dat;
    while(!TxdFlag);
    TxdFlag = 0;
}

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

void InitUart()
{
    TMOD &= 0x0F;
    TMOD |= 0x20;
    TH1 = TIMER_1MS / BAUD;
    TL1 = TIMER_1MS % BAUD;
    TR1 = 1;
    ES = 1;
    EA = 1;
}

void MatrixScan()
{
    unsigned char i;
    static unsigned char code KeyTable[] =
    {
        0x7f,0xbf,0xdf,0xef,
        0xf7,0xfb,0xfd,0xfe
    };
    for(i=0; i<8; i++)
    {
        P1 = KeyTable[i];
        _nop_();
        if((P1 & 0x0f) != 0x0f)
            break;
    }
    if(i < 8)
    {
        switch(i)
        {
            case 0: ReceiveData = '1'; break;
            case 1: ReceiveData = '4'; break;
            case 2: ReceiveData = '7'; break;
            case 3: ReceiveData = '*'; break;
            case 4: ReceiveData = '2'; break;
            case 5: ReceiveData = '5'; break;
            case 6: ReceiveData = '8'; break;
            case 7: ReceiveData = '0'; break;
            default: break;
        }
    }
    else ReceiveData = 0;
}

void UartIsr() interrupt 4
{
    if(RI)
    {
        RI = 0;
        ReceiveData = SBUF;
        if(ReceiveData == '1')
        {
            P5^4 = 1;
            DelayMs(10);
            P5^4 = 0;
        }
        if(ReceiveData == '2')
        {
            P5^4 = 1;
            DelayMs(10);
            P5^4 = 0;
        }
    }
    if(TI)
    {
        TI = 0;
        TxdFlag = 1;
    }
}

stc15w408as单片机代码：

#include <REG52.H>
#include <stdio.h>

#define FOSC 22118400L
#define BAUD 9600
#define TIMER_1MS (65536-FOSC/12/1000)

sbit LED = P5^4;

unsigned char TxdData;
unsigned char ReceiveData;
unsigned char Temperature = 25;
unsigned char TxdFlag = 0;

void SendData(unsigned char dat);
void InitUart();
void InitTimer0();
void Timer0Isr() interrupt 1;
void UartIsr() interrupt 4;

void main()
{
    InitUart();
    InitTimer0();
    while(1);
}

void SendData(unsigned char dat)
{
    SBUF = dat;
    while(!TxdFlag);
    TxdFlag = 0;
}

void InitUart()
{
    TMOD &= 0x0F;
    TMOD |= 0x20;
    TH1 = TIMER_1MS / BAUD;
    TL1 = TIMER_1MS % BAUD;
    TR1 = 1;
    ES = 1;
    EA = 1;
}

void InitTimer0()
{
    TMOD &= 0xF0;
    TMOD |= 0x01;
    TH0 = TIMER_1MS / 1000;
    TL0 = TIMER_1MS % 1000;
    ET0 = 1;
    EA = 1;
    TR0 = 1;
}

void Timer0Isr() interrupt 1
{
    TH0 = TIMER_1MS / 1000;
    TL0 = TIMER_1MS % 1000;
    Temperature++;
    if(Temperature > 40)
        Temperature = 25;
}

void UartIsr() interrupt 4
{
    if(RI)
    {
        RI = 0;
        ReceiveData = SBUF;
        if(ReceiveData == '1')
            LED = 1;
        if(ReceiveData == '2')
            LED = 0;
    }
    if(TI)
    {
        TI = 0;
        TxdFlag = 1;
    }
}