单片机8x8led点阵屏程序

以下是一个基于8051单片机的8x8 LED点阵屏程序示例，可以通过串口输入字符并在点阵屏上显示。

#include <reg51.h>

#define uchar unsigned char
#define uint unsigned int

sbit SRCLK = P2^0; // shift register clock pin
sbit RCLK = P2^1; // register clock pin
sbit SER = P2^2; // serial data pin

void delay(uint t) // delay function
{
    uint i, j;
    for (i = 0; i < t; i++) {
        for (j = 0; j < 125; j++);
    }
}

void writeByte(uchar dat) // write a byte to shift register
{
    uchar i;
    for (i = 0; i < 8; i++) {
        SRCLK = 0;
        SER = dat & 0x80;
        dat <<= 1;
        SRCLK = 1;
    }
}

void latchData() // latch data to register
{
    RCLK = 0;
    delay(1);
    RCLK = 1;
}

void showChar(uchar c) // show a character on the LED matrix
{
    uchar i, j;
    for (i = 0; i < 8; i++) {
        writeByte(1 << i);
        for (j = 0; j < 8; j++) {
            writeByte((c & (1 << j)) ? 0 : 1);
        }
        latchData();
        delay(1);
    }
}

void main()
{
    TMOD = 0x20; // use timer 1 as serial port
    TH1 = 0xfd; // set baud rate to 9600
    TL1 = 0xfd;
    SCON = 0x50; // enable serial port
    TR1 = 1; // start timer 1
    while (1) {
        while (RI == 0); // wait for input
        showChar(SBUF); // show the input character
        RI = 0; // clear receive interrupt flag
    }
}

该程序使用了一个移位寄存器来控制点阵屏，通过串口输入字符来在点阵屏上显示。你可以根据自己的需要修改程序，例如更改显示方式、加入其他功能等。