17.c

使用C语言编写的一些单片机控制程序

#include <AT89X51.H>
#include <stdio.h>

void main(void)
{
	enum TF {
		False, True} State; //定义一个枚举，使程序更易读

	union File { //联合中包含一数组和结构，
		unsigned char Str[11]; //整个联合共用11个字节内存
		struct FN {
			unsigned char Name[6],EName[5];} FileName;
		} MyFile;

	unsigned char Temp;

	SCON = 0x50; //串口方式1,允许接收
	TMOD = 0x20; //定时器1定时方式2
	TCON = 0x40; //设定时器1开始计数
	TH1 = 0xE8;	//11.0592MHz 1200波特率
	TL1 = 0xE8;
	TI = 1;
	TR1 = 1; //启动定时器

	State = True; //这里演示State只能赋为False,True两个值,其它无效
	//State = 3;这样是错误的

	printf ("Input File Name 5Byte: \n");
	scanf("%s", MyFile.FileName.Name); //保存5字节字符串要6个字节

	printf ("Input File ExtendName 4Byte: \n");
	scanf("%s", MyFile.FileName.EName);

	if (State == True)
		{
			printf ("File Name : ");
			for (Temp=0; Temp<12; Temp++)
				printf ("%c", MyFile.Str[Temp]); //这里列出所有的字节
			printf ("\n  Name :"); 
			printf ("%s", MyFile.FileName.Name);
			printf ("\n  ExtendName :");
			printf ("%s", MyFile.FileName.EName);
						
		}
	while(1);
}