text1.c

单片机快速入门原程序

#include <reg51.h>
#include<stdio.h>
Uart_Init();
sbit P10=0x90;
sbit P11=0x91;
sbit P12=0x92;
sbit P13=0x93;
sbit P14=0x94;
sbit P15=0x95;
sbit P16=0x96;
sbit P17=0x97;
int nKeyNumber;
void GetKeyNumber();
main()
{ 	

	Uart_Init();
	while(1)
	{	nKeyNumber=0xFF;
		GetKeyNumber();
		switch(nKeyNumber)
		{	case(0xFF):printf("No key pressed\n");
						break;
			case(0x00):printf("key NO. 0 down\n");
						break;
			case(0x01):printf("key NO. 1 down\n");
						break;
			case(0x02):printf("key NO. 2 down\n");
						break;
			case(0x03):printf("key NO. 3 down\n");
						break;
			case(0x04):printf("key NO. 4 down\n");
						break;
			case(0x05):printf("key NO. 5 down\n");
						break;
			case(0x06):printf("key NO. 6 down\n");
						break;
			case(0x07):printf("key NO. 7 down\n");
						break;
			case(0x08):printf("key NO. 8 down\n");
						break;
			case(0x09):printf("key NO. 9 down\n");
						break;
			case(0x0A):printf("key NO. A down\n");
						break;
			case(0x0B):printf("key NO. B down\n");
						break;
			case(0x0C):printf("key NO. C down\n");
						break;
			case(0x0D):printf("key NO. D down\n");
						break;
			case(0x0E):printf("key NO. E down\n");
						break;
			case(0x0F):printf("key NO. F down\n");
						break;
		}

	}
}


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 */
	}
void GetKeyNumber()
{		P14=0;
		{
			if(P13==0) nKeyNumber=0x00;
			if(P12==0) nKeyNumber=0x01;
			if(P11==0) nKeyNumber=0x02;
			if(P10==0) nKeyNumber=0x03;
			if(nKeyNumber!=0xFF)
			return;
		}
		P14=1;
		
		P15=0;
		{
			if(P13==0) nKeyNumber=0x04;
			if(P12==0) nKeyNumber=0x05;
			if(P11==0) nKeyNumber=0x06;
			if(P10==0) nKeyNumber=0x07;
			if(nKeyNumber!=0xFF)
			return;
		}
		P15=1;

		P16=0;
		{
			if(P13==0) nKeyNumber=0x08;
			if(P12==0) nKeyNumber=0x09;
			if(P11==0) nKeyNumber=0x0A;
			if(P10==0) nKeyNumber=0x0B;
			if(nKeyNumber!=0xFF)
			return;
		}
		P16=1;

		P17=0;
		{
			if(P13==0) nKeyNumber=0x0C;
			if(P12==0) nKeyNumber=0x0D;
			if(P11==0) nKeyNumber=0x0E;
			if(P10==0) nKeyNumber=0x0F;
			if(nKeyNumber!=0xFF)
			return;
		}
		P17=1;
}