AT80C51串口通信编程 | 按键控制LED灯列

uart8051.h：

#ifndef __UART_H__
#define __UART_H__

#define XTAL 12000000
#define baudrate 9600

char UART_putchar(char ch);
char UART_getkey(void);
void InitCom(void);

#endif

uart8051.c：

#include <reg51.h>
#include "uart8051.h"

char UART_putchar(char ch)
{
    if(ch=='\n')
    {
        SBUF = 0x0d;
        while(TI == 0);
          TI=0;
        SBUF = 0x0a;
    }
    
    else
          SBUF = ch;
    while(TI == 0);
    TI = 0;
    return ch;
}

char UART_getkey(void)
{
    char c;
    
    while(!RI);
    c = SBUF;
    RI = 0;
    return(c);
}

void InitCom(void)
{
    SCON=0X50;
    TMOD=0X20;
    PCON=0X80;
    TH1=0XF3;
    TL1=0XF3;
    ES=0;
    EA=1;
    TR1=1;
}

main.c:

#include <reg51.h>
#include <stdio.h>
#include "uart8051.h"

char putchar(char ch)
{
    return UART_putchar(ch);
}

char _getkey(void)
{
    return UART_getkey();
}

void main(void)
{
  
  
    unsigned int tem;
    InitCom();
    printf("´®¿Ú²âÊÔ£¬³£¹æʹÓÃ:\n");
    UART_putchar('A');UART_putchar(' ');
    UART_putchar('B');UART_putchar(' ');
    UART_putchar('C');UART_putchar(' ');
    UART_putchar('D');UART_putchar(' ');
    UART_putchar('\n');
    
    printf("Ç¿´óµÄ¸ñʽ»¯Á÷Êä³ö£º\n");
    printf("Êä³öÒ»¸öÕûÐΣº%d\n",(int)6886);
    printf("Êä³öÒ»¸öʵÐÍ£º%d\n",(float)68.86);
    while(1)
    {
        printf("\nÊäÈëÒ»¸öÕûÐÍ£¬ËÍP2¿Ú×¢Òâ¹Û²ìP2¿ÚµÄµÆ:\n");
        scanf("%d",&tem);
        
        P2=tem;
    }
}

编译之后，打开烧录软件烧录，然后打开串口通信助手进行调试：

如上图，分别输入1+空格，2+空格，3+空格，效果图如下：
1+空格：