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C52-day01

单片机

发布于：2023年5月8日

STC89C52

命名规则

STC89C52

  1. STC89

  2. C–>工作电压

    • C：5.5V~3.8V
    • LE:3.6V2.4V/3.4V\2.4V

  3. 52表示8K字节程序空间，512字节RAM

最小系统

​

LED灯

代码​

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/*
time: 2023-05-07
C Flowing LED
*/
# include "reg51.h"
// define an array of reg P0
//unsigned char leds[] = {0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};

void delay(unsigned int n)
{
    unsigned int i, j;
    for (i=0; i<n; i++)
    {
        for (j=0; j<120; j++);
    }
}

void led()
{
    int i = 0;
    for (i=0; i<8; i++)
    {
        P2 = ~(0x01<<i);
			//P2 = ~leds[i]; 
        delay(500);
    }
}

void main()       
{
    while(1)
    {
       led();
    }
}

​

数码管

数码管16进制显示

数码管对应16进制0~F

共阳极数码管

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unsigned char LED7Code[] = {0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92, 0x82,
						0xf8, 0x80, 0x90, 0x88, 0x83, 0xc6, 0xa1, 0x86, 0x8e};

共阴极数码管

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unsigned char  LED7Code[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,
                        0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00};

普通数码管

代码​

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/*
time: 2023-05-07
C  LED Display
*/
# include "reg51.h"

unsigned char s[] = {0X3F, 0X06, 0X5B, 0X4F, 0X66, 0X6D, 0X7D, 0X07, 0X7F, 0X6F};     // common cathode 0-9
/*                    {0X77, 0X7C, 0X39, 0X5E, 0X79, 0X71, 0X73, 0X3E, 0X31, 0X6E,}
                      {0X38, 0X00}
static display 0-9 A-F P U T Y L   */

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

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

void smg()
{
    int i = 0;

    for (i=0; i<10; i++)
    {
        P2 = s[i];
        delay(1000);
    }
}

void main()
{
    while(1)
    {
        smg();
	//P2=0X06;
    }
}

​

组合74LS138

74LS138对数码管进行片选

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/* time:2023-05-07
	74LS138  display HELLO
*/
# include "reg51.h"

unsigned char s[] = {0X76, 0X79, 0X38, 0X38, 0X3F};     // common cathode HELLO
unsigned char sbi[] = {0X00, 0X01, 0X02, 0X03, 0X04, 0X05, 0X06, 0X07}; //74LS138 chip select
/*                    {0X77, 0X7C, 0X39, 0X5E, 0X79, 0X71, 0X73, 0X3E, 0X31, 0X6E,}
                      {0X38, 0X00}
0-9 A-F P U T Y L   */

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

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

void smg()
{
    int i = 0;

    for (i=0; i<5; i++)
    {
        P3 = sbi[i];
        P2 = s[i];
        delay(10);
    }
}

void main()
{
    while(1)
    {
        smg(); 
    }
}

​

按钮控制数码管

代码​

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/*
time:2023-05-07
LED button control
*/

# include "reg51.h"

sbit key0 = P1^0;
unsigned char s[] = {0X3F, 0X06, 0X5B, 0X4F, 0X66, 0X6D, 0X7D, 0X07, 0X7F, 0X6F};     // 0-9
unsigned char num = 0;
unsigned char flag = 0;
void key()
{
    if (key0 == 0 && flag == 0)
    {
        flag = 1;
    }
    if (flag == 1 && key0 == 1)
    {
        num++;
        flag = 0;
    }
}

void seg()
{
    P2 = s[num];
    if (num == 10)
    {
        num = 0;
    }
}

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

​

更新于：2023年5月8日

51单片机