C51实现数码管动态计数

C51实现数码管动态计数

在8位数码管上显示一串数字

#include <reg52.h>
#include <intrins.h>
void delay2ms(void) //误差 0us
{
    unsigned char a, b;
    for (b = 4; b > 0; b--)
        for (a = 248; a > 0; a--)
            ;
    _nop_(); //if Keil,require use intrins.h
}

void main()
{
    unsigned int i = 0, j = 0;
    unsigned char cnt = 0;
    unsigned char a = 0xfe;
    unsigned char nums[8] = {0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07};
    while (1)
    {
        P2 = nums[i];
        P3 = a;
        delay2ms();
        a = _crol_(a, 1);
        i++;
        if (i % 100)
        {
            P2 = nums[j];
            j++;
        }
        if (i % 8 == 0)
        {
            i = 0;
            a = 0xfe;
        }
    }
}

用两个数码管显示数字从00到59

#include <reg52.h>
#include <intrins.h>
void delay30ms(void) //误差 0us
{
    unsigned char a, b;
    for (b = 101; b > 0; b--)
        for (a = 147; a > 0; a--)
            ;
}
void delay500ms(void) //误差 0us
{
    unsigned char a, b, c;
    for (c = 23; c > 0; c--)
        for (b = 152; b > 0; b--)
            for (a = 70; a > 0; a--)
                ;
}

void main()
{
    unsigned int i = 0, j = 0, k = 0, t = 0;
    unsigned char cnt = 0;
    unsigned char a = 0xfe;
    unsigned char nums[10] = {0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92, 0x82, 0xf8, 0x80, 0x90};
    unsigned char sacn[2] = {0x01, 0x02};
    while (1)
    {

        //扫描
        for (i = 0; i < 6; i++)
        {
            for (j = 0; j < 10; j++)
            {
                P2 = nums[i];
                delay30ms();
                P2 = nums[j];
                delay30ms();
                for (k = 0; k < 6; k++)
                {
                    delay30ms();
                    P3 = sacn[0];
                    P2 = nums[i];
                    delay30ms();
                    P3 = sacn[1];
                    P2 = nums[j];
                }
            }
        }

    }
}