//main.c
#include <reg52.h>
#include "delay.h"
#include "uart.h"
void main()
{
unsigned char dat = 88;
unsigned int dat2 = 1250;
float dat3 = 12.5;
UartInit();
while(1)
{
printf("Hello World\r\n");
printf("dat = %bu\r\n",dat);
printf("dat2 = %u\r\n",dat2);
printf("dat3 = %f\r\n",dat3);
delayXms(2000);
}
}
//uart.c
#include <reg52.h>
#include "uart.h"
void UartInit(void)//4800bps@11.0592MHz
{
SCON = 0x50; //8位数据，可变波特率SM0 SM1 SM2 REN TB8 RB8 TI TI
TMOD &= 0x0F; //清除定时器1模式
TMOD |= 0x20; //设定定时器1为8位自动重装方式
TL1 = 0xFA; //设定定时初值
TH1 = 0xFA; //设定定时器重装值
ET1 = 0; //禁止定时器1中断
TR1 = 1; //启动定时器1
}
void sendByte(unsigned char dat)
{
SBUF = dat;
while(!TI);
TI = 0;
}
void sendString(unsigned char *dat) //Hello World!
{
while(*dat != '\0')
{
sendByte(*dat );
}
}
char putchar(char c)
{
sendByte(c);
return c ;
}
//uart.h
#ifndef _UART_H_
#define _UART_H_
#include <reg52.h>
#include <stdio.h>
void UartInit(void);
void sendByte(unsigned char dat);
void sendString(unsigned char *dat);
char putchar(char c);
#endif
