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C52-day03

单片机

发布于：2023年5月11日

虚拟串口

代码​

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/* 
time:2023-05-10
COM
*/
# include "reg51.h"
unsigned char recdat = 0, flag = 0;

void initscon()
{
    SCON = 0X50; // 0101 0000
    TMOD = 0X20; // 0010 0000
    TH1 = 256 - 3;
    TL1 = 256 - 3;
    ES = 1;
    EA = 1;
    TR1 = 1;
}

void scon_isr() interrupt 4     // COM interrupt
{
    recdat = SBUF;
    RI = 0;
    flag = 1;                
}

void senddat()
{
    SBUF = recdat;
    while(!TI);
    TI = 0;
}

void main()
{
    initscon();
    while(1)
    {
        if (flag == 1)
        {
            senddat();
            flag = 0;
        }
    }
}

​

LCD1602

常用指令码

  1. 0X38:设置16 * 2 显示，5*7点阵， 8位数据接口
  2. 0X0C：设置开显示，不显示光标
  3. 0X06:写一个字符后地址指针加1
  4. 0X01: 显示清0，数据指针清0
  5. 0X80:LCD第一行的起始地址
  6. 0X80+0X40:LCD第二行的起始地址

‍

LCD1602功能

  1. RS​，片选

    • RS=0​，输入命令，不显示字符
    • RS=1​，写入数据，显示字符

  2. RW​，读写操作

    • RW=0​，写操作
    • RW=1​，读操作

  3. E​，使能端，高电平有效

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/* 
time:2023-05-10
LCD display
*/
# include "reg51.h"
sbit RS = P3^0;
sbit RW = P3^1;
sbit E = P3^2;
unsigned char str[] = {"xuaner"};

void delay(unsigned char n)
{
    unsigned int i = 0, j = 0; 

    for (i=0; i<n; i++)
    {
        for (j=0; j<120; j++);
    }
}

// write sign
void writecom(unsigned char com)
{
    RS = 0;
    RW = 0;
    E = 0;	//P3^2 is low --->E is high
    P2 = com;
    delay(5);      // delay
    E = 1;
    E = 0;
}

// write Data
void writedate(unsigned char date)
{
    RS = 1;
    RW = 0;
    E = 0;
    P2 = date;
    delay(5);
    E = 1;
    E = 0;
}

// initial
void initlcd()
{
    writecom(0x38);
    writecom(0x0c);
    writecom(0x06);
    writecom(0x01);
}

void display()
{
    unsigned int i = 0;

    writecom(0x80);     // second line：0x80 + 0x40
    delay(5);
    /* one Char display
    writedate('x');
    delay(5);  
    writedate('u');
    delay(5);
    writedate(a');
    delay(5);
    writedate('n');
    delay(5);
    writedate(e');
    delay(5);
    writedate('r');
    delay(5);
    */
    // string display
    while (str[i] != '\0')
    {
        writedate (str[i]);
        delay(5);
        i++;
    }     
}

void main()
{
    initlcd();
    while(1)
    {
        display();
    }
}

​

LCD时钟

代码​

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/*
time:2023-05-10
simple clk
*/

# include "reg51.h"
sbit RS = P3^0;
sbit RW = P3^1;
sbit E = P3^2;
unsigned char count = 0;
unsigned int hour = 9, min = 54, sec = 0;
unsigned char str[] = {"0123456789"};
unsigned char str1[] = {"xuaner CLK"};

void delay(unsigned char n)
{
    unsigned int i = 0, j = 0; 

    for (i=0; i<n; i++)
    {
        for (j=0; j<120; j++);
    }
}


void writecom(unsigned char com)
{
    RS = 0;
    RW = 0;
    E = 0;
    P2 = com;
    delay(5);   
    E = 1;
    E = 0;
}


void writedate(unsigned char date)
{
    RS = 1;
    RW = 0;
    E = 0;
    P2 = date;
    delay(5);
    E = 1;
    E = 0;
}


void initlcd()
{
    writecom(0x38);
    writecom(0x0c);
    writecom(0x06);
    writecom(0x01);
}

void display()
{
    unsigned char temp0 = 0, temp1 = 0, temp2 = 0, temp3 = 0, temp4 = 0, temp5 = 0;
    unsigned char i = 0;
    temp0 = hour / 10;
    temp1 = hour % 10;
    temp2 = min / 10;
    temp3 = min % 10;
    temp4 = sec / 10;
    temp5 = sec % 10;
    writecom(0X80);
    delay(5);
    while(str1[i] != '\0')
    {
        writedate(str1[i]);
        delay(5);
        i++;
    }
    writecom(0X80 + 0X40 + 4);
    delay(5);
    writedate(str[temp0]);
    delay(5);  
    writedate(str[temp1]);
    delay(5);
    writedate(':');
    delay(5);
    writedate(str[temp2]);
    delay(5);
    writedate(str[temp3]);
    delay(5);
    writedate(':');
    delay(5);
    writedate(str[temp4]);
    delay(5);
    writedate(str[temp5]);
    delay(5);  
}

void inittimer()
{
    TMOD = 0x01;
    TH0 = (65536-50000)/256;     // 50ms
    TL0 = (65536-50000)%256;
    ET0 = 1;
    EA = 1;
    TR0 = 1;
}

void timer0_isr() interrupt 1
{
    TH0 = (65536-50000)/256;     // 50ms
    TL0 = (65536-50000)%256;
    count++;
    if (count == 20)    // 1s
    {
        sec = sec + 1;
        count = 0;
    }
    if (sec == 60)
    {
        min = min + 1;
        sec = 0;
    }
    if (min == 60)
    {
        hour = hour + 1;
        min = 0;
    }
    if (hour == 24)
    {
        hour = 0;
    }
}

void main()
{
    initlcd();
    inittimer();
    while(1)
    {
        display();
    }
}

​

点阵显示

代码​

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/*
time:2023-05-10
matrix
*/

# include "reg51.h"
unsigned char code tab[] = { 0x00, 0x7e, 0xff, 0xc3, 0xc3, 0xff, 0x7e, 0x00,   // 0
                             0x00, 0x00, 0x43, 0xff, 0xff, 0x03, 0x00, 0x00,   // 1
                             0x00, 0x63, 0xc7, 0xcf, 0xdb, 0xf3, 0x63, 0x00,   // 2
                             0x00, 0x42, 0xdb, 0xdb, 0xdb, 0xff, 0x66, 0x00,   // 3
                             0x00, 0x3e, 0x46, 0xff, 0xff, 0x06, 0x06, 0x00,   // 4
                           };   
unsigned char row[] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80};
unsigned char num = 0, flag = 0;
sbit key0 = P1^0;

void key()
{
    if (flag == 0 && key0 == 0)
    {
        flag = 1;
    }
    if (flag == 1 && key0 == 1)
    {
        num++;
        flag = 0;
    }
    if (num == 5)
    {
        num = 0;
    }
}

void matrix()
{
    unsigned int i = 0;

    for (i=8*num; i<8*(num+1); i++)    
    { 
        P3 = ~row[i-8*num];
        P2 = tab[i];
    }
}

void main()
{
    while(1)
    {
        matrix();
        key();  
    }
}


​

‍

DA转换

代码​

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/*
time:2023-05-10
DA
*/

# include "reg51.h"
unsigned int value = 100, flag = 0;
sbit key0 = P1^0;
sbit key1 = P1^1;

void key()
{
    if (key0 == 0 && flag == 0)
    {
        flag = 1;
    }
    if (flag == 1 && key0 == 1)
    {
        value += 10;
        flag = 0;
    }

    if (key1 == 0 && flag == 0)
    {
        flag = 1;
    }
    if (flag == 1 && key1 == 1)
    {
        value -= 10;
        flag = 0;
    }
}
void delay(unsigned int n)
{
    int i=0, j=0;
    for (i=0; i<n; i++)
    {
        for (j=0; j<120; j++);
    }
}
/*  pwm
void PWM()
{
    P2 = 0;
delay(100);         // duty cycle :change delay
    P2 = 255;
    delay(value);

}
*/
void stair()
{
    int i = 0;
    for (i=0; i<255; i++)
    {
        P2 = i;
    }
    for (i=255; i<0; i--)
    {
        P2 = i;
    }
}

void main()
{
    while(1)
    {
        // PWM();
        stair(); // sawtooth wave
        key();
    }
}

更新于：2023年5月11日

51单片机