text1.c

单片机快速入门原程序

#include <reg51.h>
#include<stdio.h>
Uart_Init();
int factorial(int n) reentrant ;
main()
{ 	int n;
	int nResult;
	Uart_Init();
	while(1)
	{	printf("Please input a factorial number:\n");
		scanf("%d",&n);
		nResult=factorial(n);
		printf("The result of factorial(%d)=%d \n",n,nResult);
	}
}
int factorial(int n) reentrant 
	{	if(n<1) 
			return(1);
		else 
			return(n*factorial(n-1));
	}
Uart_Init()
	{SCON = 0x52;    /* 设置串行口控制寄存器SCON*/
	 TMOD = 0x20;    /* 12M时钟时波特率为2400  */
	 TCON = 0x69;    /* TCON */
	 TH1 =  0xf3;    /* TH1 */
	}